Also, in the case of a carboxylic acid (—COOH) or alcohol group being present in the compounds of the present invention, pharmaceutically acceptable esters of carboxylic acid derivatives, such as methyl, ethyl, or pivaloyloxymethyl, or acyl derivatives of alcohols, such as O-acetyl, O-pivaloyl, O-benzoyl, and O-aminoacyl, can be employed. Included are those esters and acyl groups known in the art for modifying the solubility or hydrolysis characteristics for use as sustained-release or prodrug formulations.

Any pharmaceutically acceptable pro-drug modification of a compound of this invention which results in conversion in vivo to a compound within the scope of this invention is also within the scope of this invention. For example, esters can optionally be made by esterification of an available carboxylic acid group or by formation of an ester on an available hydroxy group in a compound. Similarly, labile amides can be made. Pharmaceutically acceptable esters or amides of the compounds of this invention may be prepared to act as pro-drugs which can be hydrolyzed back to an acid (or —COO— depending on the pH of the fluid or tissue where conversion takes place) or hydroxy form particularly in vivo and as such are encompassed within the scope of this invention. Examples of pharmaceutically acceptable pro-drug modifications include, but are not limited to, —C_1-6alkyl esters and —C_1-6alkyl substituted with phenyl esters.

Accordingly, the compounds within the generic structural formulas, embodiments and specific compounds described and claimed herein encompass salts, all possible stereoisomers and tautomers, physical forms (e.g., amorphous and crystalline forms), solvate and hydrate forms thereof and any combination of these forms, as well as the salts thereof, pro-drug forms thereof, and salts of pro-drug forms thereof, where such forms are possible unless specified otherwise.

Except where noted herein, the terms “alkyl” and “alkylene” are intended to include both branched- and straight-chain saturated aliphatic hydrocarbon groups having the specified number of carbon atoms. Commonly used abbreviations for alkyl groups are used throughout the specification, e.g. methyl, may be represented by conventional abbreviations including “Me” or CH₃or a symbol that is an extended bond as the terminal group, e.g.

[Image Omitted]

ethyl may be represented by “Et” or CH₂CH₃, propyl may be represented by “Pr” or CH₂CH₂CH₃, butyl may be represented by “Bu” or CH₂CH₂CH₂CH₃, etc. “C_1-4alkyl” (or “C_1-4alkyl”) for example, means linear or branched chain alkyl groups, including all isomers, having the specified number of carbon atoms. For example, the structures

[Image Omitted]

have equivalent meanings. C_1-4alkyl includes n-, iso-, sec- and t-butyl, n- and isopropyl, ethyl and methyl. If no number is specified, 1-4 carbon atoms are intended for linear or branched alkyl groups.

Except where noted, the term “cycloalkyl” means a monocyclic or bicyclic saturated aliphatic hydrocarbon group having the specified number of carbon atoms. For example, “cycloalkyl” includes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and so on.

Except where noted, the term “aryl”, as used herein, represents a stable monocyclic or bicyclic ring system of up to 10 carbon atoms in each ring, wherein at least one ring is aromatic. Bicyclic aryl ring systems include fused ring systems, where two rings share two atoms, and spiro ring systems, where two rings share one atom. Aryl groups within the scope of this definition include, but are not limited to: phenyl, indene, isoindene, naphthalene, and tetralin.

Except where noted, the term “heteroaryl”, as used herein, represents a stable monocyclic or bicyclic ring system of up to 10 atoms in each ring, wherein at least one ring is aromatic, and at least one ring contains from 1 to 4 heteroatoms selected from the group consisting of O, N and S. Bicyclic heteroaryl ring systems include fused ring systems, where two rings share two atoms, and spiro ring systems, where two rings share one atom. Heteroaryl groups within the scope of this definition include but are not limited to: azaindolyl, benzoimidazolyl, benzisoxazolyl, benzofuranyl, benzofurazanyl, benzopyrazolyl, benzotriazolyl, benzothiophenyl, benzoxazolyl, carbazolyl, carbolinyl, cinnolinyl, dihydroindenyl, furanyl, indolinyl, indolyl, indolazinyl, indazolyl, isobenzofuranyl, isoindolyl, isoquinolyl, isothiazolyl, isoxazolyl, naphthalenyl, naphthpyridinyl, oxadiazolyl, oxazolyl, oxazoline, isoxazoline, pyranyl, pyrazinyl, pyrazolyl, pyrazolopyrimidinyl, pyridazinyl, pyridopyridinyl, pyridyl, pyrimidinyl, pyrrolyl, quinazolinyl, quinolyl, quinoxalinyl, tetrazolyl, tetrazolopyridyl, thiadiazolyl, thiazolyl, thienyl, triazolyl, dihydrobenzoimidazolyl, dihydrobenzofuranyl, dihydrobenzothiophenyl, dihydrobenzoxazolyl, dihydroindolyl, dihydroquinolinyl, dihydrobenzodioxinyl, dihydropyrazoloxazinyl, dihydropyrazolyothiazinedioxidyl, methylenedioxybenzene, benzothiazolyl, benzothienyl, quinolinyl, isoquinolinyl, oxazolyl, tetra-hydroquinoline, sulfolanyl, 1,3-benzodioxolyl, and 3-oxo-3,4dihydro-2N-benzo[b][1,4]thiazine. If the heteroaryl contains nitrogen atoms, it is understood that the corresponding N-oxides thereof are also encompassed by this definition.

The term “heterocycle” or “heterocyclyl” as used herein is intended to mean a stable nonaromatic monocyclic or bicyclic ring system of up to 10 atoms in each ring, unless otherwise specified, containing from 1 to 4 heteroatoms selected from the group consisting of O, N, S, SO, or SO₂. Bicyclic heterocyclic ring systems include fused ring systems, where two rings share two atoms, and spiro ring systems, where two rings share one atom. “Heterocyclyl” therefore includes, but is not limited to the following: azaspirononanyl, azaspirooctanyl, azetidinyl, dioxanyl, oxadiazaspirodecenyl, oxaspirooctanyl, oxazolidinonyl, piperazinyl, piperidinyl, pyrrolidinyl, morpholinyl, thiomorpholinyl, tetrahydrofuranyl, tetrahydropyranyl, dihydropiperidinyl, tetrahydrothiophenyl and the like. If the heterocycle contains a nitrogen, it is understood that the corresponding N-oxides thereof are also encompassed by this definition.

Except where noted, the term “halogen” or “halo” means fluorine, chlorine, bromine or iodine.

“Celite®” (Fluka) diatomite is diatomaceous earth, and can be referred to as “celite”.

Except where noted herein, structures containing substituent variables such as variable “R” below:

[Image Omitted]

which are depicted as not being attached to any one particular bicyclic ring carbon atom, represent structures in which the variable can be optionally attached to any bicyclic ring carbon atom. For example, variable R shown in the above structure can be attached to any one of 6 bicyclic ring carbon atoms i, ii, iii, iv, v or vi.

Except where noted herein, bicyclic ring systems include fused ring systems, where two rings share two atoms, and spiro ring systems, where two rings share one atom.

The invention also relates to medicaments containing at least one compound of the Formula I and/or of a pharmaceutically acceptable salt of the compound of the Formula I and/or an optionally stereoisomeric form of the compound of the Formula I or a pharmaceutically acceptable salt of the stereoisomeric form of the compound of Formula I, together with a pharmaceutically suitable and pharmaceutically acceptable vehicle, additive and/or other active substances and auxiliaries.

The term “patient” used herein is taken to mean mammals such as primates, humans, sheep, horses, cattle, pigs, dogs, cats, rats, and mice.

The medicaments according to the invention can be administered by oral, inhalative, rectal or transdermal administration or by subcutaneous, intraarticular, intraperitoneal or intravenous injection. Oral administration is preferred. Coating of stents with compounds of the Formulas I and other surfaces which come into contact with blood in the body is possible.

The invention also relates to a process for the production of a medicament, which comprises bringing at least one compound of the Formula I into a suitable administration form using a pharmaceutically suitable and pharmaceutically acceptable carrier and optionally further suitable active substances, additives or auxiliaries.

Suitable solid or galenical preparation forms are, for example, granules, powders, coated tablets, tablets, (micro)capsules, suppositories, syrups, juices, suspensions, emulsions, drops or injectable solutions and preparations having prolonged release of active substance, in whose preparation customary excipients such as vehicles, disintegrants, binders, coating agents, swelling agents, glidants or lubricants, flavorings, sweeteners and solubilizers are used. Frequently used auxiliaries which may be mentioned are magnesium carbonate, titanium dioxide, lactose, mannitol and other sugars, talc, lactose, gelatin, starch, cellulose and its derivatives, animal and plant oils such as cod liver oil, sunflower, peanut or sesame oil, polyethylene glycol and solvents such as, for example, sterile water and mono- or polyhydric alcohols such as glycerol.

The dosage regimen utilizing the plasma kallikrein inhibitors is selected in accordance with a variety of factors including type, species, age, weight, sex and medical condition of the patient; the severity of the condition to be treated; the route of administration; the renal and hepatic function of the patient; and the particular compound or salt thereof employed. An ordinarily skilled physician or veterinarian can readily determine and prescribe the effective amount of the drug required to prevent, counter, or arrest the progress of the condition.

Oral dosages of the plasma kallikrein inhibitors, when used for the indicated effects, will range between about 0.01 mg per kg of body weight per day (mg/kg/day) to about 30 mg/kg/day, preferably 0.025-7.5 mg/kg/day, more preferably 0.1-2.5 mg/kg/day, and most preferably 0.1-0.5 mg/kg/day (unless specified otherwise, amounts of active ingredients are on free base basis). For example, an 80 kg patient would receive between about 0.8 mg/day and 2.4 g/day, preferably 2-600 mg/day, more preferably 8-200 mg/day, and most preferably 8-40 mg/kg/day. A suitably prepared medicament for once a day administration would thus contain between 0.8 mg and 2.4 g, preferably between 2 mg and 600 mg, more preferably between 8 mg and 200 mg, and most preferably 8 mg and 40 mg, e.g., 8 mg, 10 mg, 20 mg and 40 mg. Advantageously, the plasma kallikrein inhibitors may be administered in divided doses of two, three, or four times daily. For administration twice a day, a suitably prepared medicament would contain between 0.4 mg and 4 g, preferably between 1 mg and 300 mg, more preferably between 4 mg and 100 mg, and most preferably 4 mg and 20 mg, e.g., 4 mg, 5 mg, 10 mg and 20 mg.

Intravenously, the patient would receive the active ingredient in quantities sufficient to deliver between 0.025-7.5 mg/kg/day, preferably 0.1-2.5 mg/kg/day, and more preferably 0.1-0.5 mg/kg/day. Such quantities may be administered in a number of suitable ways, e.g. large volumes of low concentrations of active ingredient during one extended period of time or several times a day, low volumes of high concentrations of active ingredient during a short period of time, e.g. once a day. Typically, a conventional intravenous formulation may be prepared which contains a concentration of active ingredient of between about 0.01-1.0 mg/mL, e.g. 0.1 mg/mL, 0.3 mg/mL, and 0.6 mg/mL, and administered in amounts per day of between 0.01 mL/kg patient weight and 10.0 mL/kg patient weight, e.g. 0.1 mL/kg, 0.2 mL/kg, 0.5 mL/kg. In one example, an 80 kg patient, receiving 8 mL twice a day of an intravenous formulation having a concentration of active ingredient of 0.5 mg/mL, receives 8 mg of active ingredient per day. Glucuronic acid, L-lactic acid, acetic acid, citric acid or any pharmaceutically acceptable acid/conjugate base with reasonable buffering capacity in the pH range acceptable for intravenous administration may be used as buffers. The choice of appropriate buffer and pH of a formulation, depending on solubility of the drug to be administered, is readily made by a person having ordinary skill in the art.

Compounds of Formula I can be administered both as a monotherapy and in combination with other therapeutic agents, including but not limited to anti-inflammatory agents, anti-VEGF agents, immunosuppressive agents, anticoagulants, antiplatelet agents, and thrombolytic agents.

An “anti-inflammatory agent” is any agent which is directly or indirectly effective in the reduction of inflammation when administered at a therapeutically effective level. “Anti-inflammatory agent” includes, but is not limited to steroidal anti-inflammatory agents and glucocorticoids. Suitable anti-inflammatory agents include, but are not limited to, cortisone, dexamethasone, hydrocortisone, methylprednisolone, prednisolone, prednisone and triamcinolone.

An “anti-VEGF agent” is any agent which is directly or indirectly effective in inhibiting the activity of VEGF (Vascular Endothelial Growth Factor). Suitable anti-VEGF agents include, but are not limited to, bevacizumab, ranibizumab and aflibercept.

An “immunosuppressant agent” is any agent which is directly or indirectly effective in suppressing, or reducing, the strength of the body's immune system. Suitable immunosuppressant agents include, but are not limited to, corticosteroids (for example, prednisone, budesonide, prednisolone), janus kinase inhibitors (for example, tofacitinib), calcineurin inhibitors (for example, cyclosporin, tacrolimus), mTOR inhibitors (for example, sirolimus, everolimus), IMDH inhibitors (for example, azathioprine, leflunomide, mycophenolate), biologics (for example, abatacept, adalimumab, anakinra, certolizumab, etanercept, golimumab, infliximab, ixekizumab, natalizumab, rituximab, secukinumab, tocilizumab, ustekinumab, vedolizumab), and monoclonal antibodies (for example, basiliximab, daclizumab).

Suitable anticoagulants include, but are not limited to, factor XIa inhibitors, thrombin inhibitors, thrombin receptor antagonists, factor VIIa inhibitors, factor Xa inhibitors, factor IXa inhibitors, factor XIIa inhibitors, adenosine diphosphate antiplatelet agents (e.g., P2Y12 antagonists), fibrinogen receptor antagonists (e.g. to treat or prevent unstable angina or to prevent reocclusion after angioplasty and restenosis), other anticoagulants such as aspirin, and thrombolytic agents such as plasminogen activators or streptokinase to achieve synergistic effects in the treatment of various vascular pathologies. Such anticoagulants include, for example, apixaban, dabigatran, cangrelor, ticagrelor, vorapaxar, clopidogrel, edoxaban, mipomersen, prasugrel, rivaroxaban, and semuloparin. For example, patients suffering from coronary artery disease, and patients subjected to angioplasty procedures, would benefit from coadministration of fibrinogen receptor antagonists and thrombin inhibitors.

In certain embodiments the anti-inflammatory agents, anti-VEGF agents, immunosuppressant agents, anticoagulants, antiplatelet agents, and thrombolytic agents described herein are employed in their conventional dosage ranges and regimens as reported in the art, including, for example, the dosages described in editions of the Physicians' Desk Reference, such as the 70th edition (2016) and earlier editions. In other embodiments, the anti-inflammatory agents, anti-VEGF agents, immunosuppressant agents, anticoagulants, antiplatelet agents, and thrombolytic agents described herein are employed in lower than their conventional dosage ranges.

Alternatively or additionally, one or more additional pharmacologically active agents may be administered in combination with a compound of the invention. The additional active agent (or agents) is intended to mean a pharmaceutically active agent (or agents) that is active in the body, including pro-drugs that convert to pharmaceutically active form after administration, which is different from the compound of the invention, and also includes free-acid, free-base and pharmaceutically acceptable salts of said additional active agents when such forms are sold commercially or are otherwise chemically possible. Generally, any suitable additional active agent or agents, including but not limited to anti-hypertensive agents, additional diuretics, anti-atherosclerotic agents such as a lipid modifying compound, anti-diabetic agents and/or anti-obesity agents may be used in any combination with the compound of the invention in a single dosage formulation (a fixed dose drug combination), or may be administered to the patient in one or more separate dosage formulations which allows for concurrent or sequential administration of the active agents (co-administration of the separate active agents). Examples of additional active agents which may be employed include but are not limited to angiotensin converting enzyme inhibitors (e.g., alacepril, benazepril, captopril, ceronapril, cilazapril, delapril, enalapril, enalaprilat, fosinopril, imidapril, lisinopril, moveltipril, perindopril, quinapril, ramipril, spirapril, temocapril, or trandolapril); angiotensin II receptor antagonists also known as angiotensin receptor blockers or ARBs, which may be in free-base, free-acid, salt or pro-drug form, such as azilsartan, e.g., azilsartan medoxomil potassium (EDARBI®), candesartan, e.g., candesartan cilexetil (ATACAND®), eprosartan, e.g., eprosartan mesylate (TEVETAN®), irbesartan (AVAPRO®), losartan, e.g., losartan potassium (COZAAR®), olmesartan, e.g., olmesartan medoxomil (BENICAR®), telmisartan (MICARDIS®), valsartan (DIOVAN®), and any of these drugs used in combination with a thiazide-like diuretic such as hydrochlorothiazide (e.g., HYZAAR®, DIOVAN HCT®, ATACAND HCT®), etc.); potassium sparing diuretics such as amiloride HCl, spironolactone, eplerenone, triamterene, each with or without HCTZ; neutral endopeptidase inhibitors (e.g., thiorphan and phosphoramidon); aldosterone antagonists; aldosterone synthase inhibitors; renin inhibitors; enalkrein; RO 42-5892; A 65317; CP 80794; ES 1005; ES 8891; SQ 34017; aliskiren (2(S),4(S),5(S),7(S)—N-(2-carbamoyl-2-methylpropyl)-5-amino-4-hydroxy-2,7-diisopropyl-8-[4-methoxy-3-(3-methoxypropoxy)-phenyl]-octanamid hemifumarate) SPP600, SPP630 and SPP635); endothelin receptor antagonists; vasodilators (e.g. nitroprusside); calcium channel blockers (e.g., amlodipine, nifedipine, verapamil, diltiazem, felodipine, gallopamil, niludipine, nimodipine, nicardipine); potassium channel activators (e.g., nicorandil, pinacidil, cromakalim, minoxidil, aprikalim, loprazolam); sympatholytics; beta-adrenergic blocking drugs (e.g., acebutolol, atenolol, betaxolol, bisoprolol, carvedilol, metoprolol, metoprolol tartrate, nadolol, propranolol, sotalol, timolol); alpha adrenergic blocking drugs (e.g., doxazosin, prazosin or alpha methyldopa); central alpha adrenergic agonists; peripheral vasodilators (e.g. hydralazine); lipid lowering agents, e.g., HMG-CoA reductase inhibitors such as simvastatin and lovastatin which are marketed as ZOCOR® and MEVACOR® in lactone pro-drug form and function as inhibitors after administration, and pharmaceutically acceptable salts of dihydroxy open ring acid HMG-CoA reductase inhibitors such as atorvastatin (particularly the calcium salt sold in LIPITOR®), rosuvastatin (particularly the calcium salt sold in CRESTOR®), pravastatin (particularly the sodium salt sold in PRAVACHOL®), and fluvastatin (particularly the sodium salt sold in LESCOL®); a cholesterol absorption inhibitor such as ezetimibe (ZETIA®), and ezetimibe in combination with any other lipid lowering agents such as the HMG-CoA reductase inhibitors noted above and particularly with simvastatin (VYTORIN®) or with atorvastatin calcium; niacin in immediate-release or controlled release forms, and particularly niacin in combination with a DP antagonist such as laropiprant and/or with an HMG-CoA reductase inhibitor; niacin receptor agonists such as acipimox and acifran, as well as niacin receptor partial agonists; metabolic altering agents including insulin sensitizing agents and related compounds for the treatment of diabetes such as biguanides (e.g., metformin), meglitinides (e.g., repaglinide, nateglinide), sulfonylureas (e.g., chlorpropamide, glimepiride, glipizide, glyburide, tolazamide, tolbutamide), thiazolidinediones also referred to as glitazones (e.g., pioglitazone, rosiglitazone), alpha glucosidase inhibitors (e.g., acarbose, miglitol), dipeptidyl peptidase inhibitors, (e.g., sitagliptin (JANUVIA®), alogliptin, vildagliptin, saxagliptin, linagliptin, dutogliptin, gemigliptin), ergot alkaloids (e.g., bromocriptine), combination medications such as JANUMET® (sitagliptin with metformin), and injectable diabetes medications such as exenatide and pramlintide acetate; inhibitors of glucose uptake, such as sodium-glucose transporter (SGLT) inhibitors and its various isoforms, such as SGLT-1, SGLT-2 (e.g., ASP-1941, TS-071, BI-10773, tofogliflozin, LX-4211, canagliflozin, dapagliflozin, ertugliflozin, ipragliflozin, remogliflozin and sotagliflozin), and SGLT-3; or with other drugs beneficial for the prevention or the treatment of the above-mentioned diseases including but not limited to diazoxide; and including the free-acid, free-base, and pharmaceutically acceptable salt forms, pro-drug forms, e.g., esters, and salts of pro-drugs of the above medicinal agents, where chemically possible. Trademark names of pharmaceutical drugs noted above are provided for exemplification of the marketed form of the active agent(s); such pharmaceutical drugs could be used in a separate dosage form for concurrent or sequential administration with a compound of the invention, or the active agent(s) therein could be used in a fixed dose drug combination including a compound of the invention.

Typical doses of the plasma kallikrein inhibitors of the invention in combination with other suitable agents may be the same as those doses of plasma kallikrein inhibitors administered without coadministration of additional agents, or may be substantially less that those doses of plasma kallikrein inhibitors administered without coadministration of additional agents, depending on a patient's therapeutic needs.

The compounds are administered to a mammal in a therapeutically effective amount. By “therapeutically effective amount” it is meant an amount of a compound of the present invention that, when administered alone or in combination with an additional therapeutic agent to a mammal, is effective to treat (i.e., prevent, inhibit or ameliorate) the disease condition or treat the progression of the disease in a host.

The compounds of the invention are preferably administered alone to a mammal in a therapeutically effective amount. However, the compounds of the invention can also be administered in combination with an additional therapeutic agent, as defined below, to a mammal in a therapeutically effective amount. When administered in a combination, the combination of compounds is preferably, but not necessarily, a synergistic combination. Synergy, as described for example by Chou and Talalay, Adv. Enzyme Regul. 1984, 22, 27-55, occurs when the effect (in this case, inhibition of the desired target) of the compounds when administered in combination is greater than the additive effect of each of the compounds when administered individually as a single agent. In general, a synergistic effect is most clearly demonstrated at suboptimal concentrations of the compounds. Synergy can be in terms of lower cytotoxicity, increased anticoagulant effect, or some other beneficial effect of the combination compared with the individual components.

By “administered in combination” or “combination therapy” it is meant that the compound of the present invention and one or more additional therapeutic agents are administered concurrently to the mammal being treated. When administered in combination each component may be administered at the same time or sequentially in any order at different points in time. Thus, each component may be administered separately but sufficiently closely in time so as to provide the desired therapeutic effect. The administration of each component does not need to be via the same route of administration; for example, one component can be administered orally, and another can be delivered into the vitreous of the eye.

The present invention is not limited in scope by the specific embodiments disclosed in the examples which are intended as illustrations of a few aspects of the invention and any embodiments that are functionally equivalent are within the scope of this invention. Indeed, various modifications of the invention in addition to those shown and described herein will become apparent to those skilled in the relevant art and are intended to fall within the scope of the appended claims.

General Methods

Compounds of the present invention may be prepared using conventional techniques or according to the methodology outlined in the following general synthetic schemes. One skilled in the art can vary the procedures and reagents shown to arrive at similar intermediates and/or final compounds.

NMR spectra were measured on VARIAN or Bruker NMR Systems (400, 500 or 600 MHz). Chemical shifts are reported in ppm downfield and up field from tetramethylsilane (TMS) and referenced to either internal TMS or solvent resonances (¹H NMR: δ 7.27 for CDCl₃, δ 2.50 for (CD₃)(CHD₂)SO, and ¹³C NMR: δ 77.02 for CDCl₃, δ 39.51 for (CD₃)₂SO. Coupling constants (J) are expressed in hertz (Hz), and spin multiplicities are given as s (singlet), d (doublet), dd (double doublet), t (triplet), m (multiplet), and br (broad). Chiral resolutions were performed on either Waters Thar 80 SFC or Berger MG II preparative SFC systems. LC-MS data were recorded on SHIMADZU LC-MS-2020, SHIMADZU LC-MS-2010, or Agilent 1100 series LC-MS, Agilent Prime-1260, or Waters Acquity LC-MS instruments using C18 columns employing a MeCN gradient in water containing 0.02 to 0.1% TFA. UV detections were at 220 and/or 254 nm and ESI ionization was used for MS detection.

When chiral resolution was achieved by chromatography using chiral columns, the chiral columns used for SFC chiral resolutions are listed in tables. Some of the chiral columns used were CHIRALPAK AD, CHIRALCEL OJ, CHIRALPAK AS, CHIRALPAK AY, CHIRALPAK IA, CHIRALPAK AD-H, and CHIRALPAK AS-H. Henceforth, they will be referred by their two or three letter abbreviations. As a convention, the fast-eluting isomer from a chiral resolution is always listed first in this table followed immediately by the slower-eluting isomer from the same resolution. If more than two isomers were separated, they will be always listed in the tables in order they were eluted, such as Peak 1 followed by Peak 2, Peak 3 and so on. A * symbol near a chiral center in a structure denotes that this chiral center was resolved by chiral resolution without its stereochemical configuration unambiguously determined.

Also, TLC is thin layer chromatography; UV is ultraviolet; W is watts; wt. % is percentage by weight; ×g is times gravity; α_Dis the specific rotation of polarized light at 589 nm; ° C. is degrees Celsius; % w/v is percentage in weight of the former agent relative to the volume of the latter agent; Hz is hertz; cpm is counts per minute; δ_His chemical shift; d is doublet; dd is doublet of doublets; MHz is megahertz; MS is mass spectrum, and a mass spectrum obtained by ES-MS may be denoted herein by “LC-MS”; m/z is mass to charge ratio; n is normal; N is normal; nm is nanometer; nM is nanomolar.

For purposes of this specification, the following abbreviations have the indicated meanings: [Mes-Acr-Me]⁺ is 9-mesityl-10-methylacridinium tetrafluoroborate; X-PHOS Pd G2 is Chloro(2-dicyclohexylphosphino-2′,4′,6′-triisopropyl-1,1′-biphenyl)[2-(2′-amino-1,1′-biphenyl)]palladium(II).

- Ac acetyl
- ACN acetonitrile
- AcOH acetic acid
- aq. aqueous
- Boc or BOC tert-butoxycarbonyl
- br broad
- Bu or ⁿBu Butyl (normal)
- Bz benzoyl
- ° C. degrees Celsius
- calcd. calculated
- δ chemical shift
- d doublet
- DAST (diethylamino)sulfur trifluoride
- DBU 1,8-diazabicyclo[5.4.0]undec-7-ene
- DCM dichloromethane
- dd doublet of doublets
- DIEA, DIPEA N,N-diisopropylethylamine or Hünig's base
- DMF dimethylformamide
- DMSO dimethyl sulfoxide
- DPPA diphenylphosphoryl azide
- dqd doublet of a quartet of doublets
- DTT dithiothreitol
- EDC 1-ethyl-3-(3-dimethylaminopropyl)carbodiimide
- EDTA ethylenediamine tetraacetic acid
- equiv. equivalent
- ESI electrospray ionization
- Et Ethyl
- Et₂O diethyl ether
- EtOH Ethanol
- EtOAc ethyl acetate
- g Grams
- GST glutathione S-transferase
- h hour
- HATU N,N,N,N-tetramethyl-O-(7-azabenzotriazol-1-yl)uronium hexafluorophosphate
- HPLC high-performance liquid chromatography
- Hz Hertz
- IPA isopropanol
- ⁱPr isopropyl
- J coupling constant
- LC liquid chromatography
- LCMS liquid chromatography mass spectrometry
- LED light emitting diode
- m multiplet
- M molar
- Me methyl
- MeOH methanol
- mg milligrams
- MHz megahertz
- min minute
- μL microliters
- mL milliliters
- mM millimolar
- mmol millimoles
- MS mass spectrometry
- MTBE methyl tert-butyl ether
- N nitrogen substituted
- nm nanometer
- nM nanomolar
- NMP 1-methylpyrrolidinone
- NMR nuclear magnetic resonance spectroscopy
- OAc acetate
- Ph phenyl
- Pr propyl
- q quartet
- rac racemic mixture
- RT or rt room temperature (ambient, about 25° C.)
- s singlet
- satd. saturated
- SFC supercritical fluid chromatography
- t triplet
- T3P propanephosphonic acid anhydride
- TBAF tert-butyl ammonium fluoride
- TBS or TBDMS tert-butyldimethyl silyl
- TBSCl tert-butyldimethylsilyl chloride
- ^tBu tert-butyl
- ^tBuOH tert-butyl alcohol
- TCFH tetramethylchloroformamidinium hexafluorophosphate
- TEA triethylamine (Et₃N)
- tert tertiary
- TFA trifluoroacetic acid
- THF tetrahydrofuran
- TLC thin layer chromatography
- TMS trimethylsilyl
- TMSCl chlorotrimethylsilane
- Tris tris(hydroxymethyl)aminomethane
- Ts toluenesulfonyl (tolyl)
- tt triplet of triplets
- X-phos or X-2-dicyclohexylphosphino-2′,4′,6′
- PHOS triisopropylbiphenyl
  
  General Methods

Starting materials used were obtained from commercial sources or prepared in other examples, unless otherwise noted. The methods used for the preparation of the compounds of this invention are illustrated by the following schemes. Unless specified otherwise, all starting materials used are commercially available.

Chiral Separation Methods

The general preparative conditions for separating diastereomeric or enantiomeric mixtures of compounds using chiral SFC are as follows:

Chiral Column
Stationary Phase
Method

AD-H
40% EtOH/CO₂
A

IC
20% EtOH/CO₂
B

AD-H
40% MeOH/CO₂
C

AD-H
40% ⁱPrOH/CO₂
D

AD-H
25% ⁱPrOH/CO₂
E

AD-H
35% ⁱPrOH/CO₂
F

OD-H
20% EtOH/CO₂
G

AS-H
20% EtOH/CO₂
H

IC
25% ⁱPrOH/CO₂
I

OJ-H
30% EtOH/CO₂
J

General Schemes

[Image Omitted]

Scheme A illustrates the synthetic sequence for preparation of substituted spirocarbamates such as A6 from Boc-protected aniline A1 and ketones such as A2. Directed lithiation of aniline A1 and addition into the heterocyclic ketone A2 occurs in the presence of Lewis acid (eg. LaCl₃). The tertiary alcohol undergoes in situ cyclization onto the carbamate to give spirocarbamate derivatives such as A3, which can be subjected to chiral separation, preferably using supercritical flow chromatography (SFC) to afford enantiomers A4 and A5. Deprotection of either enantiomer (A4, e.g.) gives the secondary amine A6.

[Image Omitted]

Scheme B illustrates the synthetic sequence for preparation of alkyl hydrazines such as B4 from carbonyl derivatives such as B1. Condensation of carbonyl B1 with benzohydrazide gives intermediate B2 which is reduced to the protected hydrazine B3. Deprotection under acidic conditions gives the alkyl hydrazine B4.

[Image Omitted]

Scheme C illustrates the synthetic sequence for preparation of CF₃ethyl hydrazine derivatives such as C4 from carbonyl derivatives such as C1. Condensation of carbonyl C1 with benzohydrazide gives intermediate C2. Addition of CF₃with TMSCF₃to C2 provides CF₃-ethyl intermediate C3 which is deprotected under acidic conditions to give the hydrazine derivatives C4.

[Image Omitted]

Scheme D illustrates the synthesis of alkyl hydrazines derivatives such as D2 from alkyl halides such as D1. Alkylation of hydrazine with alkyl halides D1 provides the alkyl hydrazines D2.

[Image Omitted]

Scheme E illustrates the synthetic sequence for preparation of alkyl hydrazine derivatives such as E3 from carboxylic acid derivatives such as E1. Photoredox decarboxylative hydrazidation of carboxylic acids E1 provides the protected hydrazine intermediate E2. Deprotection gives the alkyl hydrazine derivatives E3.

[Image Omitted]

Scheme F illustrates the synthetic sequence for preparation of alkyl hydrazine derivatives such as F4 from alkyl carboxylic derivatives such as F1. Curtius rearrangement of alkyl carboxylic acid F1 gives protected amine F2. Oxidation of F2 provides the N-nitroso intermediate F3 which is reduced and deprotected to give the alkyl hydrazine derivatives F4.

[Image Omitted]

Scheme G illustrates the synthesis of aryl hydrazines such as G2 from aryl bromides such as G1. Aryl hydrazines G2 are prepared via palladium-catalyzed cross-coupling reaction of aryl bromides such as G1 with hydrazine in the presence of suitable base.

[Image Omitted]

Scheme H illustrates the synthetic sequence for preparation of aminopyrazole derivatives such as H4 from hydrazine derivatives such as H2 and cyano alkoxyacrylate H1. Condensation of substituted hydrazines H2 with cyano ethoxy acrylate H1 affords the ester aminopyrazole derivatives such as H3. Saponification of H3 gives the carboxylic acid H4.

[Image Omitted]

Scheme I illustrates the synthetic sequence for preparation of hydroxypyrazole derivatives such as I4 from hydrazine derivatives such as I2 and alkoxymethylene malonate I1. Condensation of substituted hydrazines 12 with malonate I1 affords the ester hydroxypyrazole derivatives such as I3. Saponification of I3 gives the carboxylic acid I4.

[Image Omitted]

Scheme J illustrates the synthetic sequence for preparation of N-substituted aminopyrazole derivatives such as J4 from unsubstituted aminopyrazole derivatives such as J1. Alkylation of aminopyrazole J1 provides the N-substituted aminopyrazole J3. Saponification of J3 provides the carboxylic acid of N-substituted aminopyrazole J4.

[Image Omitted]

Scheme K illustrates the preparation of spirocarbamate pyrazole or triazole derivatives such as K1 from spirocarbamate piperidine derivatives such as K1 and carboxylic acid derivates such as K2. Coupling of carboxylic acid K2 with spirocarbamate K1 using peptide coupling agents such as TCFH, EDC, HATU or T3P provides the amide K3.

[Image Omitted]

Scheme L illustrates the synthetic sequence for the preparation of spirocarbamate aminopyrazole derivatives such as L5 from spirocarbamate piperidine derivatives such as L1. Coupling of spirocarbamate L1 with cyanoacetic acid provides intermediate L2 which undergoes condensation to give cyano acrylate derivates such as L3. Condensation of L3 with various hydrazines L4 under basic or acidic conditions provides aminopyrazoles such as L5.

Intermediate A2-1

[Image Omitted]

Tert-butyl 3-cyclopropyl-5-oxopiperidine-1-carboxylate

Cyclopropylmagnesium bromide (30.0 mL, 15.2 mmol, 0.5 M in THF) was added at −78° C. to a suspension of CuI (1.45 g, 7.61 mmol) in THF (20 mL) under N₂atmosphere. The resulting mixture was allowed to warm to 0° C. and stirred for an additional 1 h to generate the organocuprate reagent. The solution was then cooled to −78° C. followed by addition of a THF solution (5 mL) of tert-butyl 3-oxo-3,6-dihydropyridine-1(2H)-carboxylate (1.0 g, 5.1 mmol) and TMSCl (1.30 mL, 10.1 mmol). The reaction mixture was stirred at −78° C. for 1 h before quenching with MeOH. The mixture was diluted with EtOAc and satd. aq. NH₄Cl, and the layers separated. The organic layers were dried over MgSO₄, filtered and concentrated under reduced pressure. The crude residue was purified by silica gel chromatography to afford the title compound. ¹H NMR (600 MHz, CDCl₃) δ 4.12-3.74 (m, 3H), 3.18 (br s, 1H), 2.66 (dd, J=16.3, 4.6 Hz, 1H), 2.33 (dd, J=16.1, 10.5 Hz, 1H), 1.49 (s, 9H), 1.32-1.24 (m, 1H), 0.63 (tt, J=8.7, 4.7 Hz, 1H), 0.55 (dd, J=12.9, 5.3 Hz, 2H), 0.25 (s, 1H), 0.18-0.11 (m, 1H).

Intermediate A2-2

[Image Omitted]

tert-butyl 3-(difluoromethyl)-5-oxopiperidine-1-carboxylate

To a solution of tert-butyl 3-oxo-3,6-dihydropyridine-1(2H)-carboxylate (1.1 g, 5.6 mmol) and zinc difluoromethanesulfinate (2.5 g, 8.4 mmol) in trifluorotoluene (22 mL) and H₂O (9 mL), tert-Butyl hydroperoxide (1.70 mL, 12.6 mmol, 70% wt/v in H₂O) was added dropwise at rt. The reaction mixture was heated to 35° C. and stirred for 12 h. Then, the flask was cooled to rt, diluted with H₂O and DCM and the layers were separated. The combined organic layers were dried over MgSO₄, filtered and concentrated under reduced pressure. The crude residue was purified by silica gel chromatography (EtOAc:hexanes) to afford the title compound. ¹H NMR (600 MHz, CDCl₃) δ 5.80 (t, J=55.5 Hz, 1H), 4.12-3.72 (m, 3H), 3.50 (br s, 1H), 2.63 (dd, J=15.7, 5.3 Hz, 1H), 2.59-2.53 (m, 1H), 2.50 (dd, J=15.6, 8.7 Hz, 1H), 1.47 (s, 9H).

Intermediate A2-3

[Image Omitted]

Tert-butyl 3-oxo-5-(trifluoromethyl)piperidine-1-carboxylate

To a solution of tert-butyl 3-hydroxy-5-(trifluoromethyl)piperidine-1-carboxylate (8.0 g, 29.7 mmol) in DCM (50 mL), NaHCO₃(7.5 g, 89 mmol) and Dess-Martin Periodinane (15.1 g, 35.7 mmol) was added at rt. The reaction mixture was stirred at rt for 1 h. Then, the reaction was quenched with H₂O and diluted with DCM. The layers were separated and the aq. phase was extracted with DCM. The combined organic layers were dried over MgSO₄, filtered and concentrated under reduced pressure. The crude residue was purified by silica gel chromatography (EtOAc:hexanes) to afford the title compound. ¹H NMR (600 MHz, CDCl₃) δ 4.32-3.77 (m, 3H), 3.72-3.20 (m, 1H), 2.83 (d, J=6.9 Hz, 1H), 2.73 (dd, J=16.7, 6.1 Hz, 1H), 2.57 (dd, J=16.6, 9.4 Hz, 1H), 1.47 (s, 9H).

Intermediate A6-1

[Image Omitted]

6-Chloro-5-fluoro-5′,5′-dimethylspiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one

Step 1: tert-Butyl 6-chloro-5-fluoro-5′,5′-dimethyl-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carboxylate: THF (55 mL) was added to a round-bottom flask containing tert-butyl (4-chloro-3-fluorophenyl)carbamate (2.21 g, 9.0 mmol) under N₂atmosphere, and the solution was cooled to −78° C. To the stirring solution, ⁿBuLi (11.2 mL, 27.9 mmol, 2.5 M in hexanes) was added over 40 minutes. The reaction mixture was allowed to stir at −78° C. for and additional 45 minutes, at which time, a solution of LaCl₃·2LiCl (22.5 mL, 13.5 mmol, 0.6 M in THF) and tert-butyl 3,3-dimethyl-5-oxopiperidine-1-carboxylate (3.10 g, 13.5 mmol) was added at −78° C. over a period of 40 minutes to the reaction mixture. The reaction mixture was allowed to warm to rt and stirred for 16 h. KO^tBu (5.3 mL, 9.0 mmol, 1.7 M in THF) was added to the reaction mixture, and the solution was heated to 60° C. for an additional 3 h. The reaction was cooled to rt, quenched with 1 M HCl and diluted with EtOAc. The layers were separated and aq. phase was extracted with EtOAc. The combined organic layers were dried over MgSO₄, filtered and concentrated under reduced pressure. The crude residue was purified by silica gel chromatography (EtOAc:hexanes) to afford the title compound. LCMS [M+Na]⁺=421.1 (calcd. 421.1).

Step 2: 6-Chloro-5-fluoro-5′,5′-dimethylspiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one

HCl (25.0 mL, 100 mmol, 4 M in dioxane) was added to a round-bottom flask containing a suspension of tert-butyl 6-chloro-5-fluoro-5′,5′-dimethyl-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carboxylate (7.98 g, 20.0 mmol) in 1,4-dioxane (30 mL). The reaction mixture was heated to 90° C. and stirred vigorously for 12 h. The reaction was cooled to rt and concentrated to give the crude title compound that was carried forward to the next step without further purification. LCMS [M+H]⁺=299.1 (calcd. 299.1).

TABLE A

The following compounds were prepared using procedures similar to those described

for Intermediate A6-1 using the appropriate starting materials.

LCMS

Intermediate
Structure
Name
[M + H]⁺

A6-2

[Image Omitted]

(4R and S,5′S and R)-6-Chloro-5′- cyclopropyl-5- fluorospiro[benzo[d][1,3]oxazine-4,3′- piperidin]-2(1H)-one
Calcd. 311.1, found 311.0

A6-3

[Image Omitted]

(4R and S,5′R)-6-Chloro-5-fluoro-5′- methylspiro[benzo[d][1,3]oxazine-4,3′- piperidin]-2(1H)-one
Calcd. 285.1, found 285.0

A6-4

[Image Omitted]

(4R and S,5′S)-6-Chloro-5-fluoro-5′- methylspiro[benzo[d][1,3]oxazine-4,3′- piperidin]-2(1H)-one
Calcd. 311.0, found 311.0

A6-5

[Image Omitted]

(R)- and (S)-6-Chloro-5- fluorodispiro[benzo[d][1,3]oxazine-4,3′- piperidine-5′,1″-cyclopropan]-2(1H)-one
Calcd. 297.1, found 297.0

A6-6

[Image Omitted]

Methyl (4R and S,5′S and R)-6-chloro-5- fluoro-2-oxo-1,2- dihydrospiro[benzo[d][1,3]oxazine-4,3′- piperidine]-5′-carboxylate
Calcd. 329.1, found 329.0

A6-7

[Image Omitted]

(R)- and (S)-6-Chloro-5- fluorodispiro[benzo[d][1,3]oxazine-4,3′- piperidine-5′,1″-cyclobutan]-2(1H)-one
Calcd. 311.1, found 311.0

A6-8

[Image Omitted]

(R)- and (S)-6-Chloro-5-fluoro-2″,3″,5″,6″- tetrahydrodispiro[benzo[d][1,3]oxazine-4,3′- piperidine-5′,4″-pyran]-2(1H)-one
Calcd. 341.1, found 341.0

A6-9

[Image Omitted]

(4R and S,5′S and R)-6-Chloro-5′- (difluoromethyl)-5- fluorospiro[benzo[d][1,3]oxazine-4,3′- piperidin]-2(1H)-one
Calcd. 321.1, found 321.0

A6-10

[Image Omitted]

(4R and S,5′S and R)-6-Chloro-5-fluoro-5′- (trifluoromethyl)spiro[benzo[d][1,3]oxazine- 4,3′-piperidin]-2(1H)-one, hydrogen salt
Calcd. 339.1, found 338.9

A6-11

[Image Omitted]

(R)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine-4,3′- pyrrolidin]-2(1H)-one
Calcd. 257.1, found 257.0

A6-12

[Image Omitted]

(S)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine-4,3′- pyrrolidin]-2(1H)-one
Calcd. 257.1, found 257.0

A6-13

[Image Omitted]

(R)-6-Chloro-5- fluorospiro[benzo[d][1,3]oxazine-4,3′- piperidin]-2(1H)-one
Calcd. 271.1, found 271.0

A6-14

[Image Omitted]

(S)-6-Chloro-5- fluorospiro[benzo[d][1,3]oxazine-4,3′- piperidin]-2(1H)-one
Calcd. 271.1, found 271.0

Intermediate A6-15

[Image Omitted]

(Rac)-tert-Butyl (4R or S,5′R or S)-6-chloro-5-fluoro-5′-hydroxy-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carboxylate

Step 1: tert-Butyl 3-((tert-butyldimethylsilyl)oxy)-5-oxopiperidine-1-carboxylate: A flask containing a solution of tert-butyl 3-hydroxy-5-oxopiperidine-1-carboxylate (22.4 g, 104 mmol) in DMF (224 mL) was cooled to 0° C. Imidazole (21.2 g, 312 mmol) and TBSCl (18.8 g, 125 mmol) were added, and the reaction mixture was warmed to rt and stirred for 16 h. The reaction was quenched with H₂O and extracted with MTBE. The layers were separated, and the combined organic layers washed with brine. The organic layer was dried over Na₂SO₄, filtered and concentrated to afford a crude residue that was purified by silica gel chromatography (EtOAc:petroleum ether) to afford the title compound. LCMS [M−55]⁺=274.3 (calcd. 274.2).

Step 2: (rac)-tert-Butyl (4R or S,5′R or S)-5′-((tert-butyldimethylsilyl)oxy)-6-chloro-5-fluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carboxylate and (rac)-tert-butyl (4S or R, 5'S or R)-5′-((tert-butyldimethylsilyl)oxy)-6-chloro-5-fluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carboxylate: THF (188 mL) was added to a round-bottom flask containing tert-butyl (4-chloro-3-fluorophenyl)carbamate (12.5 g, 50.9 mmol), and the mixture was cooled to −78° C. ⁿBuLi (63.1 mL, 158 mmol, 2.5 M in hexanes) was added over 1 h, followed by a solution of LaCl₃·2LiCl (×102 mL, 61.1 mmol, 0.6 M in THF) and tert-butyl 3-((tert-butyldimethylsilyl)oxy)-5-oxopiperidine-1-carboxylate (20.1 g, 61.1 mmol) that was added dropwise at −78° C. over 5 min. The reaction mixture was stirred at −78° C. for 1 h, and warmed to rt for an additional 12 h. The reaction was quenched with satd. aq. NH₄Cl, poured into a flask containing ice and stirred for 15 min. The mixture was diluted with EtOAc, the layers were separated and the combined organic layers dried over MgSO₄, filtered and concentrated to afford a crude residue that was purified by silica gel chromatography (EtOAc:petroleum ether) to afford the title compound as a mixture of diastereomers. The diasteromers were separated by preparative reverse phase HPLC (ACN/water+10 mM NH₄HCO₃). The faster eluting diastereomer of the title compound was obtained: LCMS [M+Na]⁺=523.3 (calcd. 523.2). The slower eluting diastereomer of the title compound was obtained: LCMS [M+Na]⁺=523.3 (calcd. 523.2).

Step 3: (rac)-(4R or S,5′R or S)-6-Chloro-5-fluoro-5′-hydroxyspiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one: A flask containing (rac)-tert-butyl (4S or R,5'S or R)-5′-((tert-butyldimethylsilyl)oxy)-6-chloro-5-fluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carboxylate (slower eluting peak from previous step, 1.0 g, 2.0 mmol) in THF (20 mL) was cooled to 0° C. TBAF (6.0 mL, 6.0 mmol) was added, and the reaction mixture was warmed to 40° C. for 12 h. The reaction was quenched with ice-water and stirred for 15 min. The mixture was diluted with EtOAc, the layers were separated, and the combined organic layers were washed with brine. The organic layer was dried over MgSO₄, filtered and concentrated under reduced pressure to afford the crude product that was carried forward without further purification. HCl (0.9 mL, 3.5 mmol, 4 M in dioxane) was added to a vial containing a suspension of crude product (34 mg, 0.090 mmol) in 1,4-dioxane (0.8 mL). The reaction mixture was stirred vigorously at rt for 12 h and concentrated to give the crude title compound. The crude product was carried forward to the next step without further purification. LCMS [M+H]⁺=287.0 (calcd. 287.1).

Intermediate A6-16

[Image Omitted]

(Rac)-(4R or S,5′R or S)-6-Chloro-5,5′-difluorospiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one

Step 1: (rac)-tert-Butyl (4R or S,5′R or S)-6-chloro-5,5′-difluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carboxylate: A flask containing (rac)-tert-butyl (4S or R,5'S or R)-5′-((tert-butyldimethylsilyl)oxy)-6-chloro-5-fluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carboxylate (slower eluting peak from step 1 of Intermediate A6-15, 1.0 g, 2.0 mmol) in THF (20 mL) was cooled to 40° C. TBAF (6.0 mL, 6.0 mmol, 1 M THF solution) was added to the flask, and the reaction mixture was warmed to 40° C. for 12 h. The reaction was quenched with ice-water and stirred for 15 min. The mixture was diluted with EtOAc, layers were separated and the combined organic layers were washed with brine. The organic layer was dried over MgSO₄, filtered and concentrated under reduced pressure to afford a crude product that was carried forward without further purification. The crude alcohol (100 mg, 0.260 mmol) in DCM (5 mL) under N₂atmosphere was cooled to −78° C. DAST (625 mg, 0.390 mmol) in DCM (2 mL) was added dropwise, and the reaction mixture was stirred at −78° C. for 1 h. The reaction mixture was purified directly by silica gel chromatography (EtOAc:DCM) to afford the title compound. LCMS [M+H]⁺=411.3 (calcd. 411.1).

Step 2: (rac)-(4R or S,5′R or S)-6-Chloro-5,5′-difluorospiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one: HCl (0.6 mL, 2.3 mmol, 4 M in dioxane) was added to a vial containing (rac)-tert-butyl (4R or S,5′R or S)-6-chloro-5,5′-difluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carboxylate (45 mg, 0.12 mmol) in 1,4-dioxane (0.6 mL), and the reaction mixture was stirred at rt for 3 h. The solvents were removed under reduced pressure to give a crude product that was carried forward to the next step without further purification. LCMS [M+H]⁺=289.1 (calcd. 289.1).

Intermediate A6-17

[Image Omitted]

(4R and S,6'S)-6-Chloro-5-fluoro-6′-methylspiro[benzo[d][1.3]oxazine-4,3′-piperidin]-2(1H)-one

Step 1: Benzyl (4R and S,6'S)-6-chloro-5-fluoro-6′-methyl-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carboxylate: THF (15 mL) was added to a tert-butyl (4-chloro-3-fluorophenyl)carbamate (600 mg, 2.44 mmol) and cooled to −78° C. ⁿBuLi (3.0 mL, 7.57 mmol, 2.5 M in hexanes) was added over 40 min, and the resulting mixture was stirred at −78° C. for an additional 45 min. A solution of LaCl₃·2LiCl (6.1 mL, 3.66 mmol, 0.6 M in THF) and benzyl (S)-2-methyl-5-oxopiperidine-1-carboxylate (900 mg, 3.66 mmol) was added at −78° C. over 40 min, and the reaction mixture was warmed to rt and stirred for 16 h. KO^tBu (1.40 mL, 2.44 mmol, 1.7 M in THF) was added, and the reaction was heated to 60° C. for an additional 3 h. The reaction was cooled to rt, quenched with 1 M HCl and diluted with EtOAc. The layers were separated and aq. layer was extracted with EtOAc. The combined organic layers were dried over MgSO₄, filtered and concentrated to afford a crude residue that was purified by silica gel chromatography (EtOAc:hexanes) to afford the title compound as a mixture of diastereomers. LCMS [M+H]⁺=419.0 (calcd. 419.1).

Step 2: (4R and S,6'S)-6-Chloro-5-fluoro-6′-methylspiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one: HBr (3.9 mL, 71.6 mmol, 33 wt % in AcOH) was added to a vial containing benzyl (4R and S,6'S)-6-chloro-5-fluoro-6′-methyl-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carboxylate (600 mg, 1.43 mmol). The reaction mixture was heated to 80° C. for 12 h. The reaction was cooled to rt and concentrated to give the crude title compound that was carried forward to the next step without further purification. LCMS [M+H]⁺=285.1 (calcd. 285.1).

Intermediate B4-1

[Image Omitted]

Rac-(1,1,1-Trifluorobutan-2-yl)hydrazine

Step 1: N′-(1,1,1-Trifluorobutan-2-ylidene)benzohydrazide: To a solution of 1,1,1-trifluorobutan-2-one (1.39 g, 11.0 mmol) in toluene (10 mL) was added benzohydrazide (1.50 g, 11.0 mmol), and the reaction mixture was heated to 110° C. for 18 h. The reaction was cooled to rt, poured into water and then filtered. The solid was washed with water and further dried to give the desired crude title compound. LCMS [M+H]⁺=245.4 (calcd. 245.1)

Step 2: N-(1,1,1-Trifluorobutan-2-yl)benzohydrazide: A solution of N′-(1,1,1-trifluorobutan-2-ylidene)benzohydrazide (500 mg, 2.05 mmol) in THF (6 mL) was cooled to 0° C. and BH₃-THF (4.09 mL, 4.09 mmol, 1.0 M THF solution) was added dropwise. The reaction was allowed to warm to rt and was stirred for 14 h. The reaction was recooled to 0° C. and quenched with MeOH. The solvents were removed under reduced pressure and dichloromethane was added. The slurry was filtered to remove insoluble material, and the organic layer was washed with satd. aq. NH₄Cl, dried over MgSO₄, filtered and concentrated to afford the title compound. LCMS [M+H]⁺=246.7 (calcd. 247.1).

Step 3: (1,1,1-Trifluorobutan-2-yl)hydrazine: To a solution of N-(1,1,1-trifluorobutan-2-yl)benzohydrazide (274 mg, 1.11 mmol) in MeOH (3 mL) was added hydrogen chloride (1.48 mL, 17.8 mmol, 37% aq. solution), and the resulting mixture was heated to 80° C. for 16 h. The reaction was cooled to rt and concentrated under reduced pressure. EtOAc was added, and the precipitate was filtered and washed with EtOAc to afford the title compound. ¹H NMR (400 MHz, CD₃OD) δ 3.34-3.49 (m, 1H), 1.80 (dqd, J=14.7, 7.5, 4.4 Hz, 1H), 1.46-1.65 (m, 1H), 0.97-1.27 (m, 3H).

TABLE B

The following compounds were prepared using procedures similar to those described in

Intermediate B4-1 using the appropriate starting materials.

LCMS

Intermediate
Structure
Name
[M + H]⁺

B4-2

[Image Omitted]

(2,2,2-Trifluoro-1- phenylethyl)hydrazine
Calcd. 191.1, found 191.1

Intermediate C4-1

[Image Omitted]

(2,2,2-Trifluoro-1-(1-fluorocyclopropyl)ethyl)hydrazine

Step 1: N-((1-Fluorocyclopropyl)methylene)benzohydrazide: 1-Fluorocyclopropane-1-carbaldehyde (176 mg, 2.0 mmol) was added to a solution of benzohydrazide (272 mg, 2.0 mmol) in toluene (4 mL), and the reaction mixture was heated to 60° C. for 1 h. The reaction was cooled to rt and concentrated to afford a crude product that was carried forward to the next step without any purification. LCMS [M+H]⁺=207.1 (calcd. 207.1).

Step 2: N-(2,2,2-Trifluoro-1-(1-fluorocyclopropyl)ethyl)benzohydrazide: Allyltrimethylsilane (0.48 mL, 3.0 mmol) and BF₃·Et₂O (0.37 mL, 3.0 mmol) were successively added to a suspension of N′-((1-fluorocyclopropyl)methylene)benzohydrazide (412 mg, 2.0 mmol) in 1,2-dichloroethane (4.0 mL), and the mixture was heated at reflux for 5 min. The solvent was evaporated under vacuum, and the resulting residue was dissolved in DMF (4 mL). TMSCF₃(0.60 mL, 4.0 mmol) and NaOAc (660 mg, 8.0 mmol) were added, and the mixture was heated to 55° C. for 3 h. The reaction was cooled to rt and quenched with satd. aq. Na₂CO₃, and stirred for additional 5 min. The mixture was diluted with H₂O and extracted with EtOAc. The combined organic layers were dried over MgSO₄, filtered, and concentrated to afford a crude residue that was purified by silica gel chromatography (EtOAc:hexanes) to afford the title compound. LCMS [M+H]⁺=277.1 (calcd. 277.1).

Step 3: (2,2,2-Trifluoro-1-(1-fluorocyclopropyl)ethyl)hydrazine: To a solution of N-(2,2,2-trifluoro-t-(1-fluorocyclopropyl)ethyl)benzohydrazide (140 mg, 0.51 mmol) in MeOH (0.75 mL) was added HCl (0.7 mL, 8.1 mmol, 37% aq. solution), and the resulting mixture was heated to 80° C. for 16 h. The reaction was cooled to rt, and concentrated to afford a crude product that was azeotroped with toluene to afford the title compound, which was carried forward without purification. LCMS [M+H]⁺=173.1 (calcd. 173.1).

TABLE C

The following compounds were prepared using procedures similar to those described in

Intermediate C4-1 using the appropriate starting materials.

LCMS

Intermediate
Structure
Name
[M + H]⁺

C4-2

[Image Omitted]

(1-Cyclopropyl-2,2,2- trifluoroethyl)hydrazine
Calcd. 155.1, found 155.1

C4-3

[Image Omitted]

(2-Cyclopropyl-1,1,1-trifluoropropan-2- yl)hydrazine
Calcd. 169.1, found 169.1

C4-4

[Image Omitted]

(1,1,1-Trifluoro-3-methoxy-2- methylpropan-2-yl)hydrazine
Calcd. 173.1, found 173.1

C4-5

[Image Omitted]

((1S,5R)-2- (Trifluoromethyl)bicyclo[3.1.0]hexan-2- yl)hydrazine
Calcd. 181.1, found 181.1

C4-6

[Image Omitted]

(1- (Trifluoromethyl)cyclobutyl)hydrazine
Calcd. 155.1, found 155.1

C4-7

[Image Omitted]

(1,1,1-Trifluoro-2-methylpropan-2- yl)hydrazine
Calcd. 143.1, found 143.1

C4-8

[Image Omitted]

(3,3-Difluoro-1- (trifluoromethyl)cyclobutyl)hydrazine
Calcd. 191.1, found 191.1

C4-9

[Image Omitted]

(4-(Trifluoromethyl)tetrahydro-2H- pyran-4-yl)hydrazine
Calcd. 185.1, found 185.1

Intermediate D2-1

[Image Omitted]

((1-Fluorocyclopropyl)methyl)hydrazine

Hydrazine (0.33 mL, 0.33 mmol, 1.0 M THF solution) was added to vial containing 1-(bromomethyl)-1-fluorocyclopropane (50 mg, 0.33 mmol) in EtOH (0.3 mL), and the resulting mixture was heated to 70° C. for 16 h. The reaction was cooled to rt and concentrated to afford a crude product that was azeotroped with toluene to afford the title compound, which was carried forward without purification. LCMS [M+H]⁺=105.1 (calcd. 105.1).

TABLE D

The following compounds were prepared using procedures similar to those described

in Intermediate D2-1 using the appropriate starting materials.

LCMS

Intermediate
Structure
Name
[M + H]⁺

D2-2

[Image Omitted]

((1-(Trifluoromethyl)- cyclopropyl)methyl)hydrazine
Calcd. 155.1, found 155.0

Intermediate E3-1

[Image Omitted]

(1-(4-Fluorophenyl)cyclopropyl)hydrazine
Step 1: Di-tert-butyl 1-(1-(4-fluorophenyl)cyclopropyl)hydrazine-1,2-dicarboxylate

Acetonitrile (20 mL) was added to a vial containing 1-(4-fluorophenyl)cyclopropane-1-carboxylic acid (360 mg, 2.0 mmol) and [Mes-Acr-Me]⁺ photocatalyst (16 mg, 0.04 mmol). The solution was degassed with N₂for 5 min. After degassing, DBU (0.06 mL, 0.4 mmol) and di-tert-butyl azodicarboxylate (576 mg, 2.5 mmol) were added in quick succession. The vial was placed in front of 450 nm blue LEDs (Merck photoreactor) and left to stir for 12 h. The solvents were removed under reduced pressure, and the crude mixture was purified by silica gel chromatography (EtOAc:hexanes) to afford the title compound. LCMS [M−155]⁺=211.1 (calcd. 211.2).

Step 2: (1-(4-Fluorophenyl)cyclopropyl)hydrazine: HCl (6.6 mL, 26.2 mmol, 4.0 M dioxane solution) was added to a vial containing di-tert-butyl 1-(1-(4-fluorophenyl)cyclopropyl)hydrazine-1,2-dicarboxylate (640 mg, 1.75 mmol), and the reaction mixture was stirred at rt for 16 h. The solvents were removed under reduced pressure, and the mixture was azeotroped with toluene to afford the title compound, which was carried forward without purification. LCMS [M+H]⁺=167.0 (calcd. 167.1).

TABLE E

The following compounds were prepared using procedures similar to those described

in Intermediate E3-1 using the appropriate starting materials.

LCMS

Intermdiate
Structure
Name
[M-NHNH₂]⁺

E3-2

[Image Omitted]

(1-(4- Fluorophenyl)cyclobutyl)hydrazine
Calcd. 149.1, found 149.1

Intermediate F4-1

[Image Omitted]

(1-(Trifluoromethyl)cyclopropyl)hydrazine

Step 1: tert-Butyl (1-(trifluoromethyl)cyclopropyl)carbamate: To a solution of 1-(trifluoromethyl)cyclopropanecarboxylic acid (5.00 g, 32.4 mmol) in ^tBuOH (5 mL) was added TEA (5.00 mL, 35.7 mmol) and diphenylphosphinyl azide (11.8 g, 48.7 mmol), and the resulting mixture was stirred at rt for 0.5 h and heated to 100° C. for 15 h. The reaction was diluted with EtOAc and washed with 5% citric acid, satd. aq. NaHCO₃, and brine. The organic layers were dried over Na₂SO₄, filtered and concentrated to afford the crude product which was purified by silica gel chromatography (EtOAc:petroleum ether) to give the title compound. ¹H NMR (400 MHz, CDCl₃) δ 4.99-5.12 (m, 1H), 1.45 (s, 9H), 1.26 (br s, 2H), 1.11 (br s, 2H).

Step 2: tert-Butyl nitroso(1-(trifluoromethyl)cyclopropyl)carbamate: Nitrosyl tetrafluoroborate (78 mg, 0.67 mmol) was added over small portions to a solution of tert-butyl (1-(trifluoromethyl)cyclopropyl)carbamate (100 mg, 0.440 mmol) in pyridine (0.2 mL) and acetonitrile (2 mL) at −30° C. The solution was stirred at −30° C. for 30 min, then warmed to 0° C. for 2 h. The reaction was concentrated under reduced pressure to give crude product which was purified by preparatory TLC (EtOAc:petroleum ether) to afford the title compound. ¹H NMR (400 MHz, CDCl₃) δ 1.69 (s, 9H), 1.57-1.62 (m, 4H).

Step 3: (1-(Trifluoromethyl)cyclopropyl)hydrazine: tert-Butyl nitroso(1-(trifluoromethyl)cyclopropyl)carbamate (100 mg, 0.390 mmol) in MeOH (2 mL) was stirred at −78° C. for 30 min. HCl (0.32 mL, 3.9 mmol, 37% aq. solution) and zinc (257 mg, 3.93 mmol) were added at −78° C., and the resulting mixture was stirred for 2 h. The reaction was warmed to rt, filtered and concentrated to afford the title compound, which was carried forward without purification. LCMS [M+H]⁺=141.0 (calcd. 141.1).

Intermediate G2-1

[Image Omitted]

(2-(Difluoromethoxy)phenyl)hydrazine

THF (1 ml) was added to a mixture of NaO^tBu (129 mg, 1.35 mmol) and X-PHOS Pd G2 (10.6 mg, 0.0130 mmol). 1-Bromo-2-(difluoromethoxy)benzene (300 mg, 1.35 mmol) was added, and the mixture was stirred at rt for 10 min. Hydrazine (42 μL, 1.3 mmol) was added in one portion, and the vial was heated to 90° C. (preheated bath) and allowed to stir for 12 h. The reaction was cooled to rt, diluted with MeOH and filtered. The filtrate was concentrated to dryness and the crude mixture that was purified by reversed-phase preparatory-HPLC (C18 stationary phase, ACN/water+0.1% TFA) to afford the title compound. LCMS [M+H]⁺=175.0 (calcd. 175.1).

TABLE G

The following compounds were prepared using procedures similar to those described

in Intermediate G2-1 using the appropriate starting materials.

LCMS

Intermediate
Structure
Name
[M + H]⁺

G2-2

[Image Omitted]

(2-Cyclopropoxyphenyl)hydrazine
Calcd. 165.1, found 165.0

G2-3

[Image Omitted]

(2-Cyclobutoxyphenyl)hydrazine
Calcd. 179.1, found 179.0

G2-4

[Image Omitted]

(2-(2,2,2-Trifluoroethoxy)phenyl)hydrazine
Calcd. 207.1, found 207.0

G2-5

[Image Omitted]

(2-(Difluoromethoxy)-3- fluorophenyl)hydrazine
Calcd. 193.1, found 193.1

G2-6

[Image Omitted]

(2-(Difluoromethoxy)-5- fluorophenyl)hydrazine
Calcd. 193.1, found 193.1

G2-7

[Image Omitted]

(2-Cyclopropylphenyl)hydrazine
Calcd. 149.1, found 149.1

G2-8

[Image Omitted]

(2-(1-Methylcyclopropyl)phenyl)hydrazine
Calcd. 163.1, found 163.0

Intermediate H4-1

[Image Omitted]

5-Amino-1-((tetrahydro-2H-pyran-4-yl)methyl)-1H-pyrazole-4-carboxylic Acid
Step 1: Ethyl 5-amino-1-((tetrahydro-2H-pyran-4-yl)methyl)-1H-pyrazole-4-carboxylate

Sodium hydride (30.9 mg, 1.29 mmol) was added to a stirred solution of ethyl 5-amino-1H-pyrazole-4-carboxylate (100 mg, 0.650 mmol) in ACN (1 mL) 0′° C. After 1 h, 4-(bromomethyl)tetrahydro-2H-pyran (173 mg, 0.970 mmol) was added, and the resulting mixture was heated to 80° C. for 12 h. The reaction was cooled to rt and quenched with satd. aq. NH₄Cl. The aq. phase was extracted with EtOAc, and the combined organic layers were dried over Na₂SO₄, filtered and concentrated under reduced pressure. The crude product was purified by preparative reverse phase HPLC (C18 stationary phase, ACN/water+0.04% NH₄OH) to afford the title compound. LCMS [M+H]⁺=254.2 anhydrous (calcd. 254.1).

Step 2: 5-Amino-1-((tetrahydro-2H-pyran-4-yl)methyl)-1H-pyrazole-4-carboxylic acid: To a solution of ethyl 5-amino-1-((tetrahydro-2H-pyran-4-yl)methyl)-1H-pyrazole-4-carboxylate (100 mg, 0.400 mmol) in EtOH (1 mL) and H₂O (0.2 mL) was added LiOH·H₂O (20 mg, 0.47 mmol), and the resulting mixture was heated to 60° C. for 12 h. The mixture was concentrated to give the crude product was used in the next step without any purification LCMS [M+H]⁺=226.0 (calcd. 226.1).

TABLE H

The following compounds were prepared using procedures similar to those described in

Intermediate H4-1 using the appropriate starting materials.

LCMS

Intermediate
Structure
Name
[M + H]⁺

H4-2

[Image Omitted]

5-Amino-1-((3,5-dimethylisoxazol- 4-yl)methyl)-1H-pyrazole-4- carboxylic acid
Calcd. 237.1, found 237.0

H4-3

[Image Omitted]

5-Amino-1-(1-phenylpropyl)-1H- pyrazole-4-carboxylic acid
Calcd. 246.1, found 246.1

H4-4

[Image Omitted]

5-Amino-1-(1-(tetrahydro-2H- pyran-4-yl)propyl)-1H-pyrazole-4- carboxylic acid
Calcd. 254.1, found 254.2

H4-5

[Image Omitted]

5-Amino-1-(3- (trifluoromethyl)benzyl)-1H- pyrazole-4-carboxylic acid
Calcd. 286.1, found 286.0

H4-6

[Image Omitted]

5-Amino-1-(3-fluorobenzyl)-1H- pyrazole-4-carboxylic acid
Calcd. 236.1, found 236.0

Intermediate I4-1

[Image Omitted]

5-Amino-1-(1-(trifluoromethyl)cyclopropyl)-1H-pyrazole-4-carboxylic Acid

Step 1: Ethyl 5-amino-1-(1-(trifluoromethyl)cyclopropyl)-1H-pyrazole-4-carboxylate: A solution of (1-(trifluoromethyl)cyclopropyl)hydrazine (50 mg, 0.36 mmol), methyl 2-cyano-3-ethoxyacrylate (56 mg, 0.36 mmol) and DIEA (0.31 mL, 1.8 mmol) in EtOH (1 mL) was heated to 80° C. for 12 h. The reaction was cooled to rt, and concentrated under reduced pressure to give a crude product that was purified by preparatory TLC (EtOAc:petroleum ether) to afford the title compound. LCMS [M+H]⁺=264.1 (calcd. 264.1).

Step 2: 5-Amino-1-(1-(trifluoromethyl)cyclopropyl)-1H-pyrazole-4-carboxylic acid: To a solution of ethyl 5-amino-1-(1-(trifluoromethyl)cyclopropyl)-1H-pyrazole-4-carboxylate (50 mg, 0.20 mmol) in MeOH (2 mL) and H₂O (0.5 mL) was added LiOH·H₂O (42.1 mg, 1.0 mmol). The resulting mixture was heated to 70° C. for 5 h. The reaction was cooled to rt, concentrated, acidified by 1 M HCl to pH 2 and extracted with EtOAc. The combined organic layers were dried over Na₂SO₄, filtered, and concentrated under reduced pressure to give a crude product that was carried forward without further purification. LCMS [M+H]⁺=235.9 (calcd. 236.1).

Intermediate I4-2

[Image Omitted]

Intermediate I4-2 was prepared following procedures similar to those described above for Intermediate I4-1. LCMS [M+H]⁺=210.1 (calcd. 210.0).

Intermediate L3-1

[Image Omitted]

(R,E/Z)-2-(6-Chloro-5-fluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carbonyl)-3-ethoxyacrylonitrile

Step 1: 3-(6-Chloro-5-fluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidin]-1′-yl)-3-oxopropanenitrile: DIEA (7.06 mL, 40.4 mmol) was added to a solution of 6-chloro-5-fluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidin]-1′-ium chloride (4.14 g, 13.5 mmol) and 2-cyanoacetic acid (1.26 g, 14.8 mmol) in EtOAc (41 mL) and DMF (6.2 mL). 1-Propanephonic anhydride (9.60 ml, 16.2 mmol) was added, and the resulting mixture was stirred at rt overnight. The reaction was quenched with H₂O and extracted with EtOAc. The combined organic layers were washed with brine, dried over MgSO₄and concentrated to afford a crude residue that was purified by silica gel chromatography (((3:1)EtOH:EtOAc):hexanes) to afford the title compound. LCMS [M+H]⁺=337.9 (calcd. 338.1).

Step 2: (R,E/Z)-2-(6-Chloro-5-fluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carbonyl)-3-ethoxyacrylonitrile: ZnCl₂(anhydrous, 303 mg, 2.21 mmol) was added to 3-(6-chloro-5-fluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidin]-1′-yl)-3-oxopropanenitrile (2.50 g, 7.40 mmol) in triethyl orthoformate (18.5 mL, 111 mmol) and NMP (0.8 mL), and the reaction mixture was heated to 130° C. for 4 h. The reaction was cooled to rt, quenched with satd. aq. NaHCO₃and extracted with EtOAc. The combined organic layers were dried over MgSO₄, filtered, and concentrated to afford a crude residue that was purified by silica gel chromatography (EtOAc:hexanes) to afford the title compound. LCMS [M+H]⁺=394.0 (calcd. 394.1).

Intermediate L3-2

[Image Omitted]

(R)-2-(6-Chloro-5-fluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carbonyl)-3-hydroxyacrylonitrile

THF (15 mL) was added to a mixture of (R)-3-(6-chloro-5-fluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidin]-1′-yl)-3-oxopropanenitrile (1.82 g, 4.43 mmol) and methyl formate (3.99 g, 66.5 mmol). The reaction mixture was sonicated to dissolve the solid followed by dropwise addition of a solution of KO^tBu (14.2 mL, 14.2 mmol, 1 M in THF), and the resulting mixture was stirred at rt for 12 h. The reaction was diluted with H₂O, neutralized with 1 M HCl to pH 6, and extracted with EtOAc. The combined organic layers were dried over MgSO₄, filtered and concentrated to afford the crude title compound that was carried forward to the next step without any purification. LCMS [M+H]⁺=366.4 (calcd. 366.1).

Example 1

[Image Omitted]

(R)-1′-(5-Amino-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carbonyl)-6-chloro-5-fluorospiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one

(R,E/Z)-2-(6-Chloro-5-fluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carbonyl)-3-ethoxyacrylonitrile (0.25 mL, 0.10 mmol, 0.4 M stock solution in EtOH) was added to a vial containing (2,2,2-trifluoroethyl)hydrazine (17 mg, 0.15 mmol). TEA (42 μL, 0.30 mmol) was added to the vial, and the mixture was heated to 70° C. for 12 h. The reaction was cooled to rt and was purified directly by preparative reverse phase HPLC (C18 stationary phase, ACN/water+0.05% TFA) to afford the title compound.: ¹H NMR (500 MHz, CD₃OD) δ 7.55 (s, 1H), 7.43 (t, J=8.1 Hz, 1H), 6.74 (d, J=8.6 Hz, 1H), 4.76-4.66 (m, 3H), 4.46 (d, J=13.3 Hz, 1H), 3.53 (s, 1H), 3.24-3.16 (m, 1H), 2.52 (t, J=11.5 Hz, 1H), 2.30 (d, J=13.6 Hz, 1H), 2.17 (q, J=10.4 Hz, 1H), 1.73 (d, J=12.7 Hz, 1H). LCMS [M+H]⁺=462.3 (calcd. 462.1).

Example 2

[Image Omitted]

(R)-1′-(5-Amino-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carbonyl)-6-chloro-5-fluoro-5′,5′-dimethylspiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one

A 3 mL vial was charged with (R)-6-chloro-5-fluoro-5′,5′-dimethylspiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one (67 mg, 0.20 mmol) and 5-amino-1-(2,2,2-trifluoroethyl)-1H-pyrazole-4-carboxylic acid (84 mg, 0.40 mmol) in DMF (0.2 mL). To this mixture, TEA (0.14 mL, 1.0 mmol) was added followed by the addition of T3P (0.18 μL, 0.6 mmol, 50% w/v in DMF), and the resulting mixture was allowed to stir at rt for 2 h. The reaction mixture was purified directly via preparative reverse phase HPLC (C18 stationary phase, ACN/water+0.05% HCO₂H) to afford the title compound. ¹H NMR (500 MHz, CD₃OD) δ 7.62 (s, 1H), 7.44-7.40 (m, 1H), 6.74 (dd, J=8.7, 1.1 Hz, 1H), 4.79-4.70 (m, 3H), 4.27 (d, J=12.9 Hz, 1H), 3.73 (s, 1H), 2.97 (d, J=12.4 Hz, 1H), 2.17-2.03 (m, 2H), 1.24 (s, 3H), 1.03 (s, 3H). LCMS [M+H]⁺=490.4 (calcd. 490.1).

Examples 3 and 4

[Image Omitted]

(R)-1′-(5-amino-1-((R)-1,1,1-trifluorobutan-2-yl)-1H-pyrazole-4-carbonyl)-6-chloro-5-fluorospiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one and (R)-1′-(5-amino-1-((S)-1,1,1-trifluorobutan-2-yl)-1H-pyrazole-4-carbonyl)-6-chloro-5-fluorospiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one

(R)-2-(6-Chloro-5-fluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidine]-1′-carbonyl)-3-hydroxyacrylonitrile (0.25 mL, 0.01 mmol, 0.4 M stock solution in AcOH) was added to a vial containing R- and S-(1,1,1-trifluorobutan-2-yl)hydrazine (31 mg, 0.15 mmol), and the resulting mixture was heated to 80° C. for 12 h. The crude mixture was purified directly via preparative reverse phase HPLC (C18 stationary phase, ACN/water+0.05% TFA) to afford a mixture of diastereomers of the title compound. The title compounds were resolved by preparative chiral SFC with Method A. The faster eluting isomer of the title compound was obtained (Example 3): ¹H NMR (400 MHz, CD₃OD) δ 7.57 (s, 1H), 7.41 (dd, J=8.6, 7.8 Hz, 1H), 6.72 (dd, J=8.7, 1.3 Hz, 1H), 4.74-4.81 (m, 1H), 4.68 (br d, J=13.4 Hz, 1H), 4.45 (br d, J=12.2 Hz, 1H), 3.43-3.58 (m, 1H), 3.05-3.25 (m, 1H), 2.42-2.58 (m, 1H), 2.24-2.34 (m, 2H), 2.11-2.22 (m, 1H), 1.95-2.07 (m, 1H), 1.72 (dt, J=11.3, 2.2 Hz, 1H), 0.82 (t, J=7.3 Hz, 3H). LCMS [M+H]⁺=490.1 (calcd. 490.1). The slower eluting isomer of the title compound was obtained (Example 4). ¹H NMR (400 MHz, CD₃OD) δ 7.57 (s, 1H), 7.41 (dd, J=8.7, 7.7 Hz, 1H), 6.73 (dd, J=8.7, 1.3 Hz, 1H), 4.76-4.80 (m, 1H), 4.68 (br d, J=14.9 Hz, 1H), 4.46 (br d, J=11.5 Hz, 1H), 3.41-3.62 (m, 1H), 3.02-3.25 (m, 1H), 2.45-2.60 (m, 1H), 2.22-2.36 (m, 2H), 2.10-2.22 (m, 1H), 2.00 (dqd, J=14.1, 7.3, 3.9 Hz, 1H), 1.65-1.77 (m, 1H), 0.80-0.88 (m, 3H). LCMS [M+H]⁺=490.2 (calcd. 490.1).

TABLE 1

Following procedures similar to those described for Examples 1-4, the following

compounds were prepared using appropriate starting materials.

Exact Mass

Example
Structure
Name
[M + H]⁺

5

[Image Omitted]

(R)-1'-(5-Amino-1-(3- (trifluoromethyl)benzy1)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 538.1, found 539.0

6

[Image Omitted]

(R)-1'-(5-Amino-1-(3-chlorobenzyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 504.1, found 504.1

7

[Image Omitted]

(R)-1'-(5-Amino-1-(4-methylbenzyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 484.2, found 484.2

8

[Image Omitted]

(R)-1'-(5-Amino-1-benzyl-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 470.1, found 469.9

9

[Image Omitted]

(R)-1'-(5-Amino-1-(3-fluorobenzyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 488.1, found 488.0

10

[Image Omitted]

(R)-1'-(5-Amino-1-benzyl-1H- pyrazole-4-carbonyl)-6-chloro-5- fluoro-5',5'- dimethylspiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 498.2, found 498.1

11

[Image Omitted]

(R)-1'-(5-Amino-1-((3,5- dimethylisoxazol-4-yl)methyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 489.1, found 489.2

12

[Image Omitted]

(R)-1'-(5-Amino-1-((tetrahydro-2H- pyran-4-yl)methyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 478.2, found 478.2

13

[Image Omitted]

(R)-1'-(5-Amino-1- (cyclopropylmethyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 434.1, found 434.4

14

[Image Omitted]

(R)-1'-(5-Amino-1-(2- morpholinoethyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 493.2, found 493.4

15

[Image Omitted]

(R)-1'-(5-Amino-1-(2,2- difluoroethyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 444.1, found 444.4

16

[Image Omitted]

(R)-1'-(5-Amino-1-phenethyl-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 484.2, found 484.4

17

[Image Omitted]

(R)-1'-(5-Amino-1-isobutyl-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 436.2, found 436.4

18

[Image Omitted]

(R)-1'-(5-Amino-1-(tetrahydro-2H- pyran-4-y1)-1H-pyrazole-4-carbonyl)- 6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 464.1, found 464.4

19

[Image Omitted]

(R)-1'-(5-Amino-1- (bicyclo[1.1.1]pentan-1-y1)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 446.1, found 446.4

20

[Image Omitted]

(R)-1'-(5-Amino-1-(2-(2,2,2- trifluoroethoxy)ethyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 506.1, found 506.4

21

[Image Omitted]

(R)-1'-(5-Amino-1-(2- isopropoxyethyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 466.2, found 466.4

22

[Image Omitted]

(R)-1'-(5-Amino-1-cyclopenty1-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 448.2, found 448.4

23

[Image Omitted]

(R)-1'-(5-Amino-1-(tert-butyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 436.2, found 436.2

24

[Image Omitted]

(R)-1'-(5-Amino-1-(2-methoxyethyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 438.1, found 438.4

25

[Image Omitted]

(R)-1'-(5-Amino-1-ethy1-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 408.1, found 408.4

26

[Image Omitted]

(R)-1'-(5-Amino-1-((1- (trifluoromethyl)cyclopropyl)methyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 502.1, found 502.4

27

[Image Omitted]

(R)-1'-(5-Amino-1-(3,3,3- trifluoropropyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 476.1, found 476.4

28

[Image Omitted]

(R)-1'-(5-Amino-1-(1-(4- fluorophenyl)cyclopropyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 514.1, found 514.1

29

[Image Omitted]

(R)-1'-(5-Amino-1-((1- fluorocyclopropyl)methyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 452.1, found 452.4

30

[Image Omitted]

(R)-1'-(5-Amino-1-(4-methyl-5- phenyl-4H-1,2,4-triazol-3-y1)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 537.2, found 537.2

31

[Image Omitted]

(R)-1'-(5-Amino-1-(pyridin-3- ylmethyl)-1H-pyrazole-4-carbonyl)- 6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 471.1, found 471.1

32

[Image Omitted]

(R)-1'-(5-Amino-1-(pyridin-4- ylmethyl)-1H-pyrazole-4-carbonyl)- 6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 471.1, found 471.1

33

[Image Omitted]

(R)-1'-(5-Amino-1-(3,4- difluorobenzy1)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 506.1, found 506.1

34

[Image Omitted]

(R)-1'-(5-Amino-1-isopropyl-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 422.1, found 422.1

35

[Image Omitted]

(R)-1'-(5-Amino-1-cyclohexyl-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 462.2, found 462.2

36

[Image Omitted]

(R)-1'-(5-Amino-1- (cyclohexylmethyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 476.2, found 476.2

37

[Image Omitted]

(R)-1'-(5-Amino-1-(2-(4- chlorophenoxy)ethyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 534.1, found 534.1

38

[Image Omitted]

(R)-1'-(5-Amino-1-(2,3-dihydro-1H- inden-2-yl)-1H-pyrazole-4-carbonyl)- 6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 496.2, found 496.2

39

[Image Omitted]

(R)-1'-(5-Amino-1-(3- methoxybenzyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 500.1, found 500.1

40

[Image Omitted]

(R)-1'-(5-Amino-1-(2- methoxybenzyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 500.1, found 500.1

41

[Image Omitted]

(R)-1'-(5-Amino-1-(2- (dimethylamino)benzyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 513.2, found 513.2

42

[Image Omitted]

(R)-1'-(5-Amino-1-(4-chlorobenzyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 504.1, found 504.1

43

[Image Omitted]

(R)-1'-(5-Amino-1-((6- (trifluoromethyl)pyridin-3- yl)methyl)-1H-pyrazole-4-carbonyl)- 6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 539.1, found 539.1

44

[Image Omitted]

(R)-1'-(5-Amino-1-(2-chlorobenzyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 504.1, found 504.1

45

[Image Omitted]

(R)-1'-(5-Amino-1-(3-methylbenzyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 484.2, found 484.2

46

[Image Omitted]

(R)-1'-(5-Amino-1-(1-(4- fluorophenyl)cyclobutyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 528.2, found 528.4

47

[Image Omitted]

(R)-1'-(5-Amino-1-(1- (trifluoromethyl)cyclobutyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 502.1, found 502.4

48

[Image Omitted]

(R)-1'-(5-Amino-1-(2,2,3,3,3- pentafluoropropyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 512.1, found 512.3

49

[Image Omitted]

(R)-1'-(5-Amino-1-(1,1,1-trifluoro-2- methylpropan-2-y1)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 490.1, found 490.1

50

[Image Omitted]

(R)-1'-(5-Amino-1-(1- (trifluoromethyl)cyclopropyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 488.1, found 488.1

51

[Image Omitted]

(R)-1'-(5-Amino-1-(pyrimidin-5- ylmethyl)-1H-pyrazole-4-carbonyl)- 6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 472.1, found 472.2

52

[Image Omitted]

(R)-1'-(5-Amino-1-(3,3-difluoro-1- (trifluoromethyl)cyclobutyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 538.1, found 538.0

53

[Image Omitted]

(R)-1'-(5-Amino-1-(4- (trifluoromethyl)tetrahydro-2H- pyran-4-y1)-1H-pyrazole-4-carbonyl)- 6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 532.1, found 532.1

54

[Image Omitted]

(R)-1'-(5-Amino-1-(pyrazin-2- ylmethyl)-1H-pyrazole-4-carbonyl)- 6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 472.1, found 472.0

55

[Image Omitted]

(R)-1'-(5-Amino-1-(pyridin-3- ylmethyl)-1H-pyrazole-4-carbonyl)- 6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 471.1, found 471.1

56

[Image Omitted]

(R)-1'-(5-Amino-1-((1S,2S or R,5R)- 2- (trifluoromethyl)bicyclo[3.1.0]hexan- 2-y1)-1H-pyrazole-4-carbonyl)-6- chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 528.1, found 528.4

57

[Image Omitted]

(R)-1'-(5-Amino-1-phenyl-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 456.1, found 456.4

58

[Image Omitted]

(R)-1'-(5-Amino-1-(4- methoxyphenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 486.1, found 485.9

59

[Image Omitted]

(R)-1'-(5-Amino-1-(1H-indazol-6-yl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 496.1, found 495.9

60

[Image Omitted]

(R)-1'-(5-Amino-1-(6-fluoroquinolin- 4-y1)-1H-pyrazole-4-carbonyl)-6- chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 525.1, found 524.9

61

[Image Omitted]

(R)-1'-(5-Amino-1-(2-methylpyridin- 3-y1)-1H-pyrazole-4-carbonyl)-6- chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 471.1, found 470.1

62

[Image Omitted]

(R)-1'-(5-Amino-1-(3-fluoropyridin- 2-y1)-1H-pyrazole-4-carbonyl)-6- chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 475.1, found 475.0

63

[Image Omitted]

(R)-1'-(5-Amino-1-(3- (hydroxymethyl)-2-methylphenyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 500.1, found 500.1

64

[Image Omitted]

(R)-1'-(5-Amino-1-(o-toly1)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 470.1, found 469.9

65

[Image Omitted]

(R)-1'-(5-Amino-1-(2,4- dichlorophenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 524.0, found 524.2

66

[Image Omitted]

(R)-1'-(5-Amino-1-(2-fluoro-4- methylpheny1)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 488.1, found 488.3

67

[Image Omitted]

(R)-N-(4-(5-Amino-4-(6-chloro-5- fluoro-2-oxo-1,2- dihydrospiro[benzo[d][1,3]oxazine- 4,3'-piperidine]-1'-carbonyl)-1H- pyrazol-1-yl)phenyl)acetamide
Calcd. 513.1, found 513.3

68

[Image Omitted]

(R)-3-(5-Amino-4-(6-chloro-5-fluoro- 2-oxo-1,2- dihydrospiro[benzo[d][1,3]oxazine- 4,3'-piperidine]-1'-carbonyl)-1H- pyrazol-1-yl)benzoic acid
Calcd. 500.1, found 500.4

69

[Image Omitted]

(R)-1'-(5-Amino-1-phenyl-1H- pyrazole-4-carbonyl)-6-chloro-5- fluoro-5',5'- dimethylspiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 484.2, found 484.3

70

[Image Omitted]

Ethyl (R)-3-(5-amino-4-(6-chloro-5- fluoro-2-oxo-1,2- dihydrospiro[benzo[d][1,3]oxazine- 4,3'-piperidine]-1'-carbonyl)-1H- pyrazol-1-y1)-4-methylbenzoate
Calcd. 542.2, found 542.3

71

[Image Omitted]

(R)-N-(3-(5-Amino-4-(6-chloro-5- fluoro-2-oxo-1,2- dihydrospiro[benzo[d][1,3]oxazine- 4,3'-piperidine]-1'-carbonyl)-1H- pyrazol-1-yl)phenyl)acetamide
Calcd. 513.1, found 513.3

72

[Image Omitted]

(R)-1'-(5-Amino-1-(2- (trifluoromethoxy)phenyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 540.1, found 540.0

73

[Image Omitted]

(R)-1'-(5-Amino-1-(3-chloropyridin- 4-y1)-1H-pyrazole-4-carbonyl)-6- chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 491.1, found 491.3

74

[Image Omitted]

(R)-4-(5-Amino-4-(6-chloro-5-fluoro- 2-oxo-1,2- dihydrospiro[benzo[d][1,3]oxazine- 4,3'-piperidine]-l'-carbonyl)-1H- pyrazol-1-yl)benzoic acid
Calcd. 500.1, found 500.3

75

[Image Omitted]

(R)-1'-(5-Amino-1-(4-(2- oxooxazolidin-3-yl)phenyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 541.1, found 541.3

76

[Image Omitted]

(R)-1'-(5-Amino-1-(2,5- difluorophenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 492.1, found 492.3

77

[Image Omitted]

(R)-1'-(5-Amino-1-(2- (trifluoromethyl)phenyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 524.1, found 524.3

78

[Image Omitted]

(R)-1'-(5-Amino-1-(2-chloro-5- fluorophenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 508.1, found 508.2

79

[Image Omitted]

(R)-1'-(5-Amino-1-(2- methoxyphenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 486.1, found 486.0

80

[Image Omitted]

(R)-1'-(5-Amino-1-(2-ethylphenyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 484.2, found 484.4

81

[Image Omitted]

(R)-1'-(5-Amino-1-(2- isopropylphenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 498.2, found 498.4

82

[Image Omitted]

(R)-1'-(5-Amino-1-(2-chlorophenyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 490.1, found 490.3

83

[Image Omitted]

(R)-1'-(5-Amino-1-(2-bromophenyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 534.0, found 534.2

84

[Image Omitted]

(R)-1'-(5-Amino-1-(2-fluorophenyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 474.1, found 474.4

85

[Image Omitted]

(R)-1'-(5-Amino-1-(2,3- dimethylphenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 484.2, found 484.4

86

[Image Omitted]

(R)-1'-(5-Amino-1-(2,4- dimethylphenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 484.2, found 484.4

87

[Image Omitted]

(R)-1'-(5-Amino-1-(2,5- dimethylphenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 484.2, found 484.4

88

[Image Omitted]

(R)-1'-(5-Amino-1-(5-fluoro-2- methylpheny1)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 488.1, found 488.3

89

[Image Omitted]

(R)-1'-(5-Amino-1-(2- cyclopropoxyphenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 512.1, found 512.9

90

[Image Omitted]

(R)-1'-(5-Amino-1-(2- (difluoromethoxy)phenyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 522.1, found 522.0

91

[Image Omitted]

(R)-1'-(5-Amino-1-(2,2- difluorobenzo[d][1,3]dioxol-4-y1)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 536.1, found 536.3

92

[Image Omitted]

Methyl (R)-4-(5-amino-4-(6-chloro- 5-fluoro-2-oxo-1,2- dihydrospiro[benzo[d][1,3]oxazine- 4,3'-piperidine]-l'-carbonyl)-1H- pyrazol-1-yl)-3-methoxybenzoate
Calcd. 544.1, found 544.3

93

[Image Omitted]

(R)-1'-(5-Amino-1-(2,6- difluorophenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 492.1, found 492.3

94

[Image Omitted]

(R)-1'-(5-Amino-1-(5-chloro-2- methoxyphenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 520.1, found 520.3

95

[Image Omitted]

(R)-1'-(5-Amino-1-(2- cyclopropylphenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 496.2, found 496.4

96

[Image Omitted]

(R)-1'-(5-Amino-1-(2- phenoxyphenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 548.1, found 548.3

97

[Image Omitted]

(R)-1'-(5-Amino-1-(2- cyclobutoxyphenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 526.2, found 526.3

98

[Image Omitted]

(R)-1'-(5-Amino-1-(2-(1- methylcyclopropyl)phenyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 510.2, found 510.4

99

[Image Omitted]

(R)-1'-(5-Amino-1-(2-(2,2,2- trifluoroethoxy)phenyl)-1H-pyrazole- 4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 554.1, found 554.3

100

[Image Omitted]

(R)-1'-(5-Amino-1-(4-fluoro-2- methoxyphenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 504.1, found 504.3

101

[Image Omitted]

(R)-1'-(5-Amino-1-(3,5-difluoro-2- methoxyphenyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 522.1, found 522.3

102

[Image Omitted]

(R)-1'-(5-Amino-1-(3,5- dichloropyridin-4-y1)- 1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 525.0, found 525.0

103

[Image Omitted]

(R)-1'-(5-Amino-1-(quinolin-4-yl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 507.1, found 507.1

104

[Image Omitted]

(R)-1'-(5-Amino-1-(8-fluoroquinolin- 4-y1)-1H-pyrazole-4-carbonyl)-6- chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 525.1, found 525.1

105

[Image Omitted]

(R)-1'-(5-Amino-1-(3-methylpyridin- 4-y1)-1H-pyrazole-4-carbony1)-6- chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 471.1, found 471.1

106

[Image Omitted]

(R)-1'-(5-Amino-1-(2- (difluoromethoxy)-5-fluorophenyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 540.1, found 540.3

107

[Image Omitted]

(R)-1'-(5-Amino-1-(2- (difluoromethoxy)-3-fluorophenyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 540.1, found 540.3

108

[Image Omitted]

(R)-1'-(5-Amino-1-(3- methoxypyridin-2-y1)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 487.1, found 487.0

109

[Image Omitted]

(R)-1'-(5-Amino-1-methyl-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 394.1, found 394.0

110

[Image Omitted]

(R)-1'-(5-Amino-1-(3-chlorophenyl)- 1H-pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 490.1, found 490.3

111

[Image Omitted]

(R)-1'-(5-Amino-1-(p-toly1)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 470.1, found 469.9

TABLE 2

Following procedures similar to those described for Examples 3 and 4, the following

compounds were prepared using appropriate starting materials .. Diastereomeric products were

separated using chiral SFC methods specified in the table. For those pairs of diastereomers, the

fast-eluting isomer is listed first.

Exact Mass
Chiral

Example
Structure
Name
[M + H]⁺
Method

112

[Image Omitted]

(R)-1'-(5-Amino-1-((R or S)-1- (tetrahydro-2H-pyran-4- yl)propyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
found 506.2
J

113

[Image Omitted]

(R)-1'-(5-Amino-1-((S or R)-1- (tetrahydro-2H-pyran-4- yl)propyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 506.2, found 506.2
J

114

[Image Omitted]

(R)-1'-(5-Amino-1-((R or S)-2,2,2- trifluoro-1-(1- fluorocyclopropyl)ethyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 520.1, found 520.0
G

115

[Image Omitted]

(R)-1'-(5-Amino-1-((S or R)-2,2,2- trifluoro-1-(1- fluorocyclopropyl)ethyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 520.1, found 520.0
G

116

[Image Omitted]

(R)-1'-(5-Amino-1-((S or R)-1- phenylpropyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 498.2, found 498.2
J

117

[Image Omitted]

(R)-1'-(5-Amino-1-((R or S)-1- phenylpropyl)-1H-pyrazole-4- carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 498.2, found 498.2
J

118

[Image Omitted]

(R)-1'-(5-Amino-1-((R or S)-3- methyl-1,1- dioxidotetrahydrothiophen-3-y1)- 1H-pyrazole-4-carbonyl)-6- chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 512.1, found 512.3
C

119

[Image Omitted]

(R)-1'-(5-Amino-1-((Sor R)-3- methyl-1,1- dioxidotetrahydrothiophen-3-yl)- 1H-pyrazole-4-carbonyl)-6- chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 512.1, found 512.3
C

120

[Image Omitted]

(R)-1'-(5-Amino-1-((R or S)-1,1,1- trifluoropropan-2-y1)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 476.1, found 476.4
D

121

[Image Omitted]

(R)-1'-(5-Amino-1-((S or R)-1,1,1- trifluoropropan-2-y1)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 476.1, found 476.4
D

122

[Image Omitted]

(R)-1'-(5-Amino-1-((R or S)-2,2,2- trifluoro-1-phenylethyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 538.1, found 538.0
H

123

[Image Omitted]

(R)-1'-(5-Amino-1-((Sor R)-2,2,2- trifluoro-1-phenylethyl)-1H- pyrazole-4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 538.1, found 538.0
H

124

[Image Omitted]

(R)-1'-(5-Amino-1-((R or S)-1- cyclopropyl-2,2,2-trifluoroethyl)- 1H-pyrazole-4-carbonyl)-6- chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 502.1, found 502.1
E

125

[Image Omitted]

(R)-1'-(5-Amino-1-((S or R)-1- cyclopropyl-2,2,2-trifluoroethyl)- 1H-pyrazole-4-carbonyl)-6- chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 502.1, found 502.1
E

126

[Image Omitted]

(R)-1'-(5-Amino-1-((R or S)-2- cyclopropyl-1,1,1-trifluoropropan- 2-y1)-1H-pyrazole-4-carbonyl)-6- chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 516.1, found 516.2
F

127

[Image Omitted]

(R)-1'-(5-Amino-1-((S or R)-2- cyclopropyl-1,1,1-trifluoropropan- 2-y1)-1H-pyrazole-4-carbonyl)-6- chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 516.1, found 516.2
F

128

[Image Omitted]

(R)-1'-(5-Amino-1-((R or S)-1,1,1- trifluoro-3-methoxy-2- methylpropan-2-y1)-1H-pyrazole- 4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 520.1, found 520.3
B

129

[Image Omitted]

(R)-1'-(5-Amino-1-((Sor R)-1,1,1- trifluoro-3-methoxy-2- methylpropan-2-y1)-1H-pyrazole- 4-carbonyl)-6-chloro-5- fluorospiro[benzo[d][1,3]oxazine- 4,3'-piperidin]-2(1H)-one
Calcd. 520.1, found 520.3
B

130

[Image Omitted]

(R)-1'-(5-Amino-1-((R or S)-1,1,1- trifluorobutan-2-y1)-1H-pyrazole- 4-carbonyl)-6-chloro-5-fluoro- 5',5'- dimethylspiro[benzo[d][1,3] oxazine-4,3'-piperidin]- 2(1H)-one
Calcd. 518.2, found 518.4
D

131

[Image Omitted]

(R)-1'-(5-Amino-1-((S or R)-1,1,1- trifluorobutan-2-y1)-1H-pyrazole- 4-carbonyl)-6-chloro-5-fluoro- 5',5'- dimethylspiro[benzo[d][1,3] oxazine-4,3'-piperidin]- 2(1H)-one
Calcd. 518.2, found 518.4
D

Example 132

[Image Omitted]

(R)-6-Chloro-5-fluoro-1′-(1-(4-fluorobenzyl)-5-hydroxy-1H-pyrazole-4-carbonyl)spiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one

Step 1: Ethyl 1-(4-fluorobenzyl)-5-hydroxy-1H-pyrazole-4-carboxylate: To a solution of (4-fluorobenzyl)hydrazine hydrochloride (650 mg, 3.68 mmol) and diethyl 2-(ethoxymethylene)malonate (875 mg, 4.05 mmol) in H₂O (3 mL) was added K₂CO₃(1.27 g, 9.20 mmol), and the resulting mixture was heated to 100° C. for 3 h. The reaction was cooled to rt, and the mixture was washed with EtOAc. The aq. phase was acidified with 1 M HCl to pH 2 and extracted with EtOAc. The organic layers were dried over Na₂SO₄, filtered, and concentrated under reduced pressure to give the crude title compound that was carried forward without further purification. LCMS [M+H]⁺=265.0 (calcd. 265.1).

Step 2: 1-(4-Fluorobenzyl)-5-hydroxy-1H-pyrazole-4-carboxylic acid: To a solution of ethyl 1-(4-fluorobenzyl)-5-hydroxy-1H-pyrazole-4-carboxylate (25 mg, 0.095 mmol) in EtOH (1 mL) and H₂O (0.2 mL) was added NaOH (38 mg, 0.95 mmol), and the resulting mixture was heated to 90° C. for 4 h. The reaction was cooled to rt and concentrated to afford a crude residue that was acidified with 1 M HCl to pH 2 and extracted with EtOAc. The organic layers were dried over Na₂SO₄, filtered, and concentrated under reduced pressure to give the crude title compound that was carried forward without further purification. LCMS [M+H]⁺=237.0 (calcd. 237.1).

Step 3: (R)-6-Chloro-5-fluoro-1′-(1-(4-fluorobenzyl)-5-hydroxy-1H-pyrazole-4-carbonyl)spiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one: To a solution of 1-(4-fluorobenzyl)-5-hydroxy-1H-pyrazole-4-carboxylic acid (20 mg, 0.085 mmol) and (R)-6-chloro-5-fluorospiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one (31 mg, 0.085 mmol) in ACN (2 mL) was added TCFH (26 mg, 0.093 mmol) and 1-methylimidazole (21 mg, 0.25 mmol), and the resulting mixture was stirred at rt for 12 h. The reaction was concentrated to afford a crude residue that was purified by preparative reverse phase HPLC (C18 stationary phase, ACN/water+0.1% TFA) to afford mixture of diastereomers of the title compound. ¹H NMR (500 MHz, CD₃OD) δ 7.91 (br s, 1H), 7.46 (t, J=8.2 Hz, 1H), 7.32 (br s, 2H), 7.09 (br t, J=8.5 Hz, 2H), 6.76 (br d, J=8.4 Hz, 1H), 5.13 (br s, 2H), 4.36 (s, 2H), 3.19 (br s, 2H), 2.52 (br s, 1H), 2.31 (br d, J=13.7 Hz, 1H), 2.17 (br d, J=13.1 Hz, 1H), 1.75 (br d, J=14.5 Hz, 1H). LCMS [M+H]⁺=489.1 (calcd. 489.1).

Example 133

[Image Omitted]

(R)-1′-(5-Amino-1-benzyl-1H-1,2,3-triazole-4-carbonyl)-6-chloro-5-fluorospiro[benzo[d][1,3]oxazine-4,3′-piperidin]-2(1H)-one

A 4 mL vial was charged with (R)-6-chloro-5-fluoro-2-oxo-1,2-dihydrospiro[benzo[d][1,3]oxazine-4,3′-piperidin]-1′-ium 2,2,2-trifluoroacetate (50 mg, 0.13 mmol) and 5-amino-1-benzyl-1H-1,2,3-triazole-4-carboxylic acid (28 mg, 0.13 mmol) in DMF (5 mL). To this mixture, DIEA (23 μL, 0.13 mmol) was added followed by the addition of HATU (49 mg, 0.13 mmol) in one portion, and the resulting mixture was allowed to stir at rt for 2 h. The reaction mixture was purified directly via preparative reverse phase HPLC (C18 stationary phase, ACN/water+0.05% TFA) to afford the title compound. ¹H NMR (500 MHz, CD₃OD) δ 7.91 (br s, 1H), 7.46 (t, J=8.2 Hz, 1H), 7.32 (br s, 2H), 7.09 (br t, J=8.5 Hz, 2H), 6.76 (br d, J=8.4 Hz, 1H), 5.13 (br s, 2H), 4.36 (s, 2H), 3.19 (br s, 2H), 2.52 (br s, 1H), 2.31 (br d, J=13.7 Hz, 1H), 2.17 (br d, J=13.1 Hz, 1H), 1.75 (br d, J=14.5 Hz, 1H). LCMS [M+H]⁺=489.1 (calcd. 489.1).

Factor XIa Assay

The effectiveness of a compound of the present invention as an inhibitor of Coagulation factor XIa can be determined using a relevant purified serine protease, and an appropriate synthetic substrate. The rate of hydrolysis of the chromogenic or fluorogenic substrate by the relevant serine protease was measured both in the absence and presence of compounds of the present invention. Assays were conducted at rt or at 37° C. Hydrolysis of the substrate resulted in release of amino trifluoromethylcoumarin (AFC), which was monitored spectrofluorometrically by measuring the increase in emission at 510 nm with excitation at 405 nm. A decrease in the rate of fluorescence change in the presence of inhibitor is indicative of enzyme inhibition. Such methods are known to one skilled in the art. The results of this assay are expressed as the half-maximal inhibitory concentrations (IC₅₀), or the inhibitory constant, K_i.

Compounds were pre-incubated for 30 min at 25° C. with human (0.04 nM) factor XIa in 50 mM HEPES buffer with 150 mM sodium chloride, 5 mM calcium chloride, 0.1% PEG 8000, pH 7.4. factor XIa enzymatic activity was determined by addition of the substrate glycine-proline-arginine-7-amido-4-trifluoromethylcoumarin (GPR-AFC) and measurement of the fluorescence at 400/505 nm after a 60 min incubation at 25° C. The % inhibition for each data point was calculated from the data and analyzed using the log (inhibitor) vs. response four parameters equation to determine the half-maximal inhibitory concentrations (IC₅₀). The IC₅₀were converted to equilibrium inhibitory constants (Ki) using the Cheng-Prusoff equation.

The activities shown by this assay indicate that the compounds of the invention may be therapeutically useful for treating or preventing various cardiovascular and/or cerebrovascular thromboembolic conditions in patients suffering from unstable angina, acute coronary syndrome, refractory angina, myocardial infarction, transient ischemic attacks, atrial fibrillation, stroke such as thrombotic stroke or embolic stroke, venous thrombosis, coronary and cerebral arterial thrombosis, cerebral and pulmonary embolism, atherosclerosis, deep vein thrombosis, disseminated intravascular coagulation, and reocclusion or restenosis of recanalized vessels.

Plasma Kallikrein Assay

The effectiveness of a compound of the present invention as an inhibitor of plasma kallikrein can be determined using a relevant purified serine protease, and an appropriate synthetic substrate. The rate of hydrolysis of the chromogenic or fluorogenic substrate by the relevant serine protease was measured both in the absence and presence of compounds of the present invention. Assays were conducted at rt or at 37° C. Hydrolysis of the substrate resulted in release of amino trifluoromethylcoumarin (AFC), which was monitored spectrofluorometrically by measuring the increase in emission at 510 nm with excitation at 405 nm. A decrease in the rate of fluorescence change in the presence of inhibitor is indicative of enzyme inhibition. Such methods are known to one skilled in the art. The results of this assay are expressed as the half-maximal inhibitory concentrations (IC₅₀), or the inhibitory constant, K_i.

Plasma kallikrein determinations were made in 50 mM HEPES buffer at pH 7.4 containing 150 mM NaCl, 5 mM CaCl₂), and 0.1% PEG 8000 (polyethylene glycol; Fisher Scientific). Determinations were made using purified Human plasma kallikrein at a final concentration of 0.5 nM (Enzyme Research Laboratories) and the synthetic substrate, Acetyl-K—P—R-AFC (Sigma #C6608) at a concentration of 100 mM.