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  • C07D207/22—Heterocyclic compounds containing five-membered rings not condensed with other rings, with one nitrogen atom as the only ring hetero atom with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having one double bond between ring members or between a ring member and a non-ring member with hetero atoms or with carbon atoms having three bonds to hetero atoms with at the most one bond to halogen, e.g. ester or nitrile radicals, directly attached to ring carbon atoms
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Definitions

• Isocitrate dehydrogenases catalyze the oxidative decarboxylation of isocitrate to 2-oxoglutarate (i. ⁇ ?., a-ketoglutarate). These enzymes belong to two distinct subclasses, one of which utilizes NAD(+) as the electron acceptor and the other NADP(+). Five isocitrate dehydrogenases have been reported: three NAD(+)-dependent isocitrate dehydrogenases, which localize to the mitochondrial matrix, and two NADP(+)-dependent isocitrate dehydrogenases, one of which is mitochondrial and the other predominantly cytosolic. Each NADP(+)-dependent isozyme is ahomodimer.
• IDH1 isocitrate dehydrogenase 1 (NADP+), cytosolic
• IDP isocitrate dehydrogenase 1
• IDCD ID PC or PICD
• Theprotein encoded by this gene is the NADP(+)-dependent isocitrate dehydrogenase found in the cytoplasm and peroxisomes. It contains the PTS-1 peroxisomal targeting signal sequence.
• This enzyme inperoxisomes suggests roles in the regeneration of NADPH for intraperoxisomal reductions, such as the conversion of 2, 4-dienoyl- CoAs to 3-enoyl-CoAs, aswell as in peroxisomal reactions that consume 2-oxoglutarate, namely the alpha-hydroxylation ofphytanic acid.
• the cytoplasmic enzyme serves a significant role in cytoplasmic NADPH production.
• the human IDH 1 gene encodes a protein of 414 amino acids.
• the nucleotide and amino acid sequences for human IDH 1 can be found as GenBank entries NM 005896.2 and
• NP 005887.2 respectively.
• the nucleotide and amino acid sequences for IDH1 are also described in, e.g., Nekrutenko et al., M ol. Biol. Evol. 15:1674-1684(1998); Geisbrecht et al., J. BioL Chem. 274 :30527-30533(1999); Wiemann et al., Genome Res. 1 1:422-435(2001); The MGC Project Team, Genome Res.
• Non-mutant e.g., wild type
• IDH 1 catalyzes the oxidative decarboxylation of isocitrate to a-ketoglutarate thereby reducing NAD + (NADP + ) to NADH (NADPH), e.g., in the forward reaction:
• Described herein are methods of treating a cancer characterized by the presence of a mutant allele of IDH l or IDH2.
• the methods comprise the step of administering to a subject in need thereof a compound of formula I, or a pharmaceutically acceptable salt, tautomer, isotopologue or hydrate the I
• R 1 is optionally substituted C4-C6 carbocyclyl
• each R 2 and R 3 is independently selected from optionally substituted aryl or optionally substituted heteroaryl;
• R 4 is alkyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted aralkyl, or optionally substituted heteroaralkyl;
• ring A is 4-6 membered non-aromatic ring having 0- 1 additional heteroatoms selected from N, O or S, wherein ring A is optionally substituted with one or two R 5 groups;
• each R 5 is independently halo; -CF ; -CN; -OR 6 ;-N(R 6 ) 2 ; -C(0)C,-C 4 alkyl; C 1 -C4 haloalkyl; C ,-C 4 alkyl optionally substituted with -OR 6 or -N(R 6 ) 2 ; -0-Ci-C 4 alkyl optionally substituted with halo, -OR 6 or -N(R 6 ) 2 ; -S0 2 N(R 6 ) 2 ; -S0 2 (C ,-C 4 alkyl); -NR 6 S0 2 R 6 ; C3-C5 carbocyclyl optionally substituted with one or two R 6 groups; -0-(C 3 -C6 carbocyclyl optionally substituted with one or two R 6 groups); 5-6 membered heteroaryl; -Ci-C 4 alkyl-C(0)0-Ci-C4 alkyl; or -C(0)0-
• each R 6 is independently H or C 1 -C3 alkyl.
• the compound of formula I inhibits mutant IDH 1/2, particularly mutant IDH 1 having alpha hydroxyl neoactivity. Also described herein are pharmaceutical compositions comprising a compound of formula I.
• halo or halogen refers to any radical of fluorine, chlorine, bromine or iodine.
• alky 1 refers to a hydrocarbon chain that may be a straight chain or branched chain, containing the indicated number of carbon atoms.
• -C 12 alkyl indicates thatthe group may have from 1 to 12 (inclusive) carbon atoms in it.
• haloalkyl refers to an alkyl in which one or more hydrogen atoms are replaced by halo, and includes alkyl moieties in which all hydrogens have been replaced by halo (e.g., perfiuoroalkyl).
• arylalkyl or “aralkyl” refer to an alkyl moiety in which an alkyl hydrogen atom is replaced by an ary 1 group .
• Arylalkyl or aralkyl includes groups in which more than one hydrogen atom has been rep laced by an ary 1 group .
• Examp les of " arylalky 1" or " aralky 1" include benzy 1, 2- pherylethyl, 3-pherylpropyl, 9-fiuorenyl, benzhydryl, and trityl groups.
• heteroarylalkyl or “hetero aralkyl” refer to an alkyl moiety in which an alkyl hydrogen atom is replaced by a heteroaryl group .
• Heteroarylalkyl or heteroaralkyl includes groups in which more than one hydrogen atom has been rep laced by a heteroaryl group.
• alkylene refers to a divalent akyl, e.g, -CH 2 -, -CH 2 CH 2 -, and -CH 2 CH 2 CH 2 -.
• alkenyl refers to a straight or branched hydrocarbon chain containing 2- 12 carbon atoms and having one or more double bonds. Examples of alkenyl groups include, but are not limited to, allyl, propenyl, 2-butenyl, 3-hexenyl and 3-octenyl groups. One of the double bond carbons may optionally be the point of attachment of the alkenyl substituent.
• alkynyl refers to a straight or branched hydrocarbon chain containing2-12 carbon atoms and characterized in having one or more triple bonds.
• alkynyl groups include, but are not limited to, ethynyl, propargyl, and 3-hexynyl.
• One ofthe triple bond carbons may optionally be the point of attachment of the alkynyl substituent.
• alkoxy refers to an -O-alkyl radical.
• t erm halo alkoxy refers to an alkoxy in which one or more hydrogen atoms are replaced by halo, and includes alkoxy moieties in which allhydrogens have been rep laced by halo (e.g., perfiuoroalkoxy).
• carbocyclyl refers to amonocyclic, bicyclic or tricyclic, hydrocarbon ring system that is not fully aromatic, wherein any ringatom capable of substitution can be substituted by one or more substituents.
• a carbocyclyl can be fully or partially saturated.
• a bicyclic or tricylic carbocyclyl may contain one (in the case of abicycle) or up to two (in the case of a tricycle) aromatic rings, as long as at least one ring in the carbocyclylis non-aromatic. Unless otherwise specified, any ring atom capable of substitution in a carbocyclyl can be substituted by one or more substituents.
• aryl refers to afully aromatic monocyclic, bicyclic, or tricyclic hydrocarbon ringsystem
• aryl moieties are phenyl, naphthyl, and anthracenyl. Unless otherwise specified, any ring atom in an aryl can be substituted by one or more substituerts.
• cycloalkyl refers to a saturated cyclic, bicyclic, tricyclic, or poty cyclic hydrocarbon group . Unless otherwise specified, any ring atom can be substituted by one or more substituents.
• the cycloalkyl groups can contain fused rings. Fused rings are rings that share a common carbon atom. Examples of cycloalkyl moieties include, but are not limited to, cyclop ropy 1, cyclohexyl, methylcyclohexyl, adamantyl, and norbornyl. Unless otherwise specified, any ring atom can be substituted by one or more substituents.
• heterocyclyl refers to amonocyclic, bicyclic or tricyclic, ringstructure that is not fully aromatic and includes one to four heteroatoms independently selected from N, O, or S in one or more of the rings.
• a heterocyclyl can be fully or partially saturated.
• a bicyclic or tricylic heterocyclyl may contain one (in the case of a bicycle) or up to two (inthe case of a tricycle) aromatic rings, as long as at least one ring in the heterocyclyl is non-aromatic. Unless otherwise specified, any ring atom capable of substitution in a heterocyclyl can be substituted by one or more substituents.
• Heterocyclyl groups include, for example, thiophene, thianthrene, furan, pyran, isobenzofuran, chromene, xanthene, phenoxathiin, pyrrole, imidazole, pyrazole, isothiazole, isoxazole, pyridine, pyrazine, pyrimidine, pyridazine, indolizine, isoindole, indole, indazole, purine, quinolizine, isoquinoline, quinoline, phthalazine, naphthyridine, quinoxaline, quinazoline, cinnoline, pteridine, carbazole, carboline, phenant uridine, acridine, pyrimidine, phenanthroline, phenazine, phenarsazine,phenothiazine, furazan, phenoxazine, pyrrolidine, ox
• heteroaryl refers to a monocyclic, bicyclic, or tricyclic ring system having 1-3 heteroatoms if monocyclic, 1-6 heteroatoms if bicyclic, or 1-9 heteroatoms if tricyclic, said heteroatoms independently selected from O, N, or S, wherein each ringin a heteroaryl is fully aromatic. Unless otherwise specified, any ring atom capable of substitution in a heteroaryl can be substituted by one or more substituents.
• heteroalkyl and “heter oar alky 1”, as used herein, refers to an alkyl group substituted with aheteroaryl group .
• the ring heteroatoms of the compounds provided herein include N-O, S(O), and S(0)2.
• substituted refers to the replacement of a hydrogen atom with another moiety.
• substituents include alky 1 (e.g., CI , C2, C3, C4, C5, C6, C7, C8, C9, CIO, Cl l, C12 straight or branched chain alkyl), cycloalkyl, haloalkyl (e. g., perfluoroalkyl such as CF 3 ), aryl, heteroaryl, aralkyl, heter oaralkyl, heterocyclyl, akenyl, alkynyl, cycloalkenyl,
• heterocycloalkenyl, alkoxy, haloakoxy e. g., perfluoroakoxy such as OCF 3
• haloakoxy e. g., perfluoroakoxy such as OCF 3
• halo e. g., perfluoroakoxy such as OCF 3
• halo e. g., perfluoroakoxy such as OCF 3
• halo e. g., perfluoroakoxy such as OCF 3
• halo e. g., perfluoroakoxy such as OCF 3
• tautomer refers to each of two or more isomers of a compound (e.g., a compound described herein) that exist together in equilibrium, and are readily interchangeable by migration of a hydrogen atom or proton, accomp anied by a switch of a single bond and an adjacent double bond.
• the term “elevated levels of 2HG” means 10%, 20% 30%, 50%, 75%, 100%, 200%, 500% or more 2HG than is present in a subject that does not carry a mutant IDH1 or IDH2 allele.
• the term “elevated levels of 2HG” may refer to the amount of 2HG within a cell, within a tumor, within an organ comprising a tumor, or within abodily fluid.
• the term "bodily fluid” includes one or more of amniotic fluid surrounding a fetus, aqueous humour, blood (e.g., blood plasma), serum, Cerebrospinal fluid, cerumen, chyme, Cowper's fluid, female ejaculate, interstitial fluid, lymph, breast milk, mucus (e.g., nasal drainage or phlegm), pleural fluid, pus, saliva, sebum, semen, serum, sweat, tears, urine, vaginal secretion, or vomit.
• blood e.g., blood plasma
• serum Cerebrospinal fluid
• cerumen cerumen
• chyme chyme
• Cowper's fluid female ejaculate
• interstitial fluid lymph
• breast milk mucus (e.g., nasal drainage or phlegm)
• mucus e.g., nasal drainage or phlegm
• pleural fluid pus, saliva, sebum, semen, serum
• inhibitor or “prevent” include both comp lete and partial inhibition and prevention.
• An inhibitor may completely or partially inhibit.
• treat means decrease, suppress, attenuate, diminish, arrest, or stabilize the development or progression of a cancer (e. g., a cancer delineated herein), lessen the severity of the cancer or improve the symptoms associated with the cancer.
• an amount of a compound effective to treat a disorder or a
• “therap eutically effective amount” refers to an amount of the comp ound which is effective, upon single or multiple dose administration to a subject, in treating a cell, or in curing alleviating, relieving or improving a subject with a disorder beyond that expected in the absence of such treatment.
• the term "subject” is intended to include human and non-human animals.
• exemplary human subjects include a human patient having a disorder, e. g., a disorder described herein or a normal subj ect.
• non-human animals of the invention includes all vertebrates, e.g., non-mammals (such as chickens, amphibians, reptiles) and mammals, such as non-human primates, domesticated and/or agriculturally useful animals, e.g., sheep, dog, cat, cow, pig, etc.
• R 1 is optionally substituted C 4 -C 6 carbocyclyl
• each R and R is independently selected from optionally substituted aryl or optionally substituted heteroaryl;
• R 4 is alkyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted aralkyl, or optionally substituted heteroaralkyl;
• ring A is 4-6 membered non-aromatic ring having 0-1 additional heteroatoms selected from N, O or S, wherein ring A is optionally substituted with one or two R 5 groups;
• each R 5 is independently halo; -CF 3 ; -CN; -OR 6 ;-N(R 6 ) 2 ; -C(0)Ci-C 4 alkyl; Ci-C 4 haloalkyl; C, -C 4 alkyl optionally substituted with -OR 6 or -N(R 6 ) 2 ; -O-C 1 -C4 alkyl optionally substituted with halo, -OR 6 or -N(R 6 ) 2 ; -S0 2 N(R 6 ) 2 ; -S0 2 (C ,-C 4 alkyl); -NR 6 S0 2 R 6 ; C 3 -C 5 carbocyclyl optionally substituted with one or two R 6 groups; -0-(C 3 -C 6 carbocyclyl optionally substituted with one or two R 6 groups); 5-6 membered heteroaryl; -C
• each R 6 is independently H or C 1 -C3 alkyl.
• R 1 is optionally substituted C4-C 6 carbocyclyl
• each R 2 and R 3 is independently selected from optionally substituted aryl or optionally substituted heteroaryl;
• R 4 is alkyl, optionally substituted aryl, optionally substituted heteroaryl, optionally substituted aralkyl, or optionally substituted heteroaralkyi;
• ring A is 4-6 membered non-aromatic ring having 0- 1 additional heteroatoms selected from N, O or S, wherein ring A is optionally substituted with one or two R 5 groups;
• each R 5 is independently halo, -CF 3 , -CN, -OR 6 , -N(R 6 ) 2 , -C(0)CH 3 ; C,-C 3 haloalkyl, C,- C 3 alkyl optionally substituted with -OR 6 or -N(R 6 ) 2 ; or
• each R 6 is independently H or C
• R 1 is C4-C6 carbocyclyl optionally substituted with one to three R 7 groups;
• each R and R is independently selected from aryl or heteroaryl, wherein said aryl or heteroaryl is independently optionally substituted with one to three R 7 groups;
• R 4 is alkyl, aryl, heteroaryl, aralkyl, or heteroaralkyi, wherein said aryl, heteroaryl, aralkyl, and heteroaralkyi are each independently optionally substituted with one to three R 7 groups;
• ring A is 4-6 membered non-aromatic ring having 0- 1 additional heteroatoms selected from N, O or S, wherein ring A is optionally substituted with one or two R 5 groups;
• each R 5 and R 7 is independently halo; -CF 3 ; -CN; -OR 6 ;-N(R 6 ) 2 ; -C(0)Ci-C 4 alkyl; C 1 -C4 haloalkyl; C 1 -C4 alkyl optionally substituted with -OR 6 or -N(R 6 ) 2 ; -O-C 1 -C4 alkyl optionally substituted with halo, -OR 6 or -N(R 6 ) 2 ; -S0 2 N(R 6 ) 2 ; -S0 2 (C i-C 4 alkyl); -S(0)-Ci.
• each R 6 is independently H or C 1 -C4 alkyl.
• R 1 is C4-C6 carbocyclyl optionally substituted with one to three R 7 groups;
• each R 2 and R 3 is independently selected from aryl or heteroaryl, wherein said aryl or heteroaryl is independently optionally substituted with one to three R groups;
• R 4 is alkyl, aryl, heteroaryl, aralkyi, or heteroaralkyi, wherein said aryl, heteroaryl, aralkyi, and heteroaralkyi are each independently optionally substituted with one to three R 7 groups;
• ring A is 4-6 membered non-aromatic ring having 0- 1 additional heteroatoms selected from N, O or S, wherein ring A is optionally substituted with one or two R 5 groups;
• each R 5 and R 7 is independently halo, -CF 3 , -CN, -OR 6 , -N(R 6 ) 2 , -C(0)CH 3 ; C,-C 3 haloalkyl, Ci -C 3 alkyl optionally substituted with -OR 6 or -N(R 6 ) 2 ; or
• each R 6 is independently H or C i-C 3 alkyl.
• R 1 is optionally substituted C4-C6 cycloalkyl. In one aspect of this embodiment, R 1 is C4-C cycloalkyl optionally substituted with one to three R 7 groups. In another aspect of this embodiment, R 1 is C4, C 5 , or C 6 cycloalkyl optionally substituted with one to two R 7 groups and R 7 is halo. In another aspect of this embodiment, R 1 is C4 or C 6 cycloalkyl optionally substituted with one to two R 7 groups and R 7 is halo. In yet another aspect of this embodiment, R 1 is
• R 1 is
• R is optionally substituted aryl. In one aspect of this specification,
• R is aryl optionally substituted with oneto three R groups.
• R is phenyl optionally substituted with one totwo R groups and R is -CI.
• R is optionally substituted aryl or optionally substituted aryl
• R is optionally substituted heteroaryl. In another aspect of this embodiment, R is optionally substituted heteroaryl. In another aspect of this embodiment, R is optionally substituted heteroaryl. In another aspect of this embodiment, R is optionally substituted heteroaryl. In another aspect of this embodiment, R is optionally substituted heteroaryl. In another aspect of this embodiment, R is optionally substituted heteroaryl. In another aspect of this embodiment, R is optionally substituted heteroaryl. In another
• R is heteroaryl optionally substituted with one to three R group .
• R 3 is pyridinyl, indazolyl, benzoimidazolyl, indolyl, orN-
• each R is optionally substituted with one R wherein R is -F.
• R is optionally substituted aryl.
• R is optionally substituted aryl.
• R is aryl optionally substituted with oneto three R groups.
• R is phenyl optionally substituted with one R wherein R is -F.
• R 3 is phenyl optionally substituted with one or two R 7 s wherein each R 7 is independently halo; -CN; -N(R 6 ) 2 ; C r C 4 alkyl optionally substituted with -OR 6 ; -0-C C 4 alkyl optionally substituted with halo, or -OR 6 ; -S0 2 N(R 6 ) 2 ; -S0 2 (C 1 -C4 alkyl); -S(0)-C !
• R is
• R 4 is optionally substituted aryl, optionally substitutedheteroaryl, optionally substituted aralkyl, or optionally substituted heteroaralkyl.
• R 4 is aryl, heteroaryl, aralkyl, or heteroaralkyl, wherein said aryl, heteroaryl, aralkyl, and heteroaralkyl are each independently optionally substituted with oneto three R groups.
• R 4 is aryl or heteroaryl, each aryl or heteroaryl is optionally substituted with one to three R 7 groups.
• R 4 is 6- membered aryl or 5-6 membered heteroaryl, wherein said aryl or heteroaryl is optionally substituted with one to three R 7 groups.
• R 4 is 6- membered aryl or 5-6 membered heteroaryl, wherein said aryl or heteroaryl is optionally substituted with one to three R 7 groups.
• each member of R 4 is optionally substituted with one or two R 7 groups and each R 7 is independently F, CI, methyl, CF 3 , CN, OMe, or N(R 6 ) 2 .
• each R 7 is independently F, CI, methyl, CF 3 , CN, OMe, or N(R 6 ) 2 .
• R 4 is:
• R 100 is independently H, methyl, F, CI, CF 3 , CN, OCH 3 , or N(R 6 ) 2 .
• R 4 is:
• R 4 is:
• ring A is
• each R 5 is independently halo; -OR 6 ; -C(0)d -C 4 alkyl; C ,-C 4 alkyl optionally substituted with -OR 6 ; -C3-C5 carbocyclyl optionally substituted with one or two R 6 groups; -C 1 -C4 alkyl-C(0)0-Ci-C 4 alkyl; or -C(0)0- C 1 -C4 alkyl.
• each R 5 is
• each R 5 is independently methyl or -C(0)CH 3 .
• ring A is:
• ring A is:
• R 1 , R 4 , ring A and R 7 are as defined in formula I or any one of the above embodiments and R 10 is CR 1 1 or N wherein R 1 1 is -F, -S0 2 NH 2 , -S0 2 CH 3 , -CN, methoxy, -OCH 2 OH, -CH 2 OH, -S0 2 N(CH 3 ) 2 , -S0 2 NHCH 3 , -NHS0 2 CH 3 , -CH 2 CH 2 OH, -N(CH 3 ) 2, t-butyl, cyclopropyl, -C(OH)(CH 3 ) 2 , -OCF 3 , -OCHF 2 , -O-cyclopropyl, -1 -methyl-cyclopropyl, or pyrazolyl.
• R 1 , R 4 , and ring A are as defined in formula I or any one of the above embodiments; R 7 is H or CI; and and R 10 is CR 1 1 or N wherein R 1 1
• R 1 , R 4 , and ring A are as defined in formula 1 or any one of the above embodiments and R 7 is H or CI.
• R 4 is:
• R 4 is H or R 4 and R 1 , R 2 , R 3 , R 4 and ring A as defined in Formula I or in any of the embodiments described herein.
• R 4 is alkyl.
• R 4 is optionally substituted aryl or optionally substituted heteroaryl; and R 1 , R 2 , R 3 , R 4 and ring A as defined in Formula I or in any of the embodiments described herein.
• R 4 is aryl or heteroaryl, each independently substituted with one to three R 7 groups.
• R 1 , R 2 , R 3 , R 4 , R 5 , R 6 , R 7 and ring A are as defined in any of the embodiments herein.
• the com ounds ofthis invention may contain one or more asymmetric centers and thus occur as racemates, racemic mixtures, scalemic mixtures, and diastereomeric mixtures, as well as single enantiomers or individual stereoisomers that are substantially free from another possible enantiomer or stereoisomer.
• substantially free of other stereoisomers means a preparation enriched in acompound having a selected stereochemistry at one or more selected stereocenters by at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99%.
• enriched means that at least the designated percentage of a preparation is the compound having a selected stereochemistry at one or more selected stereocenters.
• M ethods of obtaining or synthesizing an individual enantiomer or stereoisomer for agiven compound are known in the art and may be applied as practicable to final compounds or to starting material or intermediates.
• the compound is enriched in a specific stereoisomer by at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99%.
• the compounds of formulal, II, Il-a, II-a-1 , Il-b or II-b-1 may also comprise one or more isotopic substitutions.
• H may be in any isotopic form, including ' ⁇ , 2 H (D or
• H T or tritium
• C may be in any isotopic form, including C, C, and C
• O may be in any isotopic form, including 16 0 and 18 0; and the like.
• the compound is enriched in a specific isotopic form of H, C and/or O by at least about 60%, 65%, 70%, 75%, 80%, 85%, 90%, 95%, 96%, 97%, 98%, or 99%.
• the compounds ofthis invention may also be represented in multiple tautomeric forms, in such instances, the invention expressly includes all tautomeric forms of the compounds described herein, even though only a single tautomeric form may be represented (e.g., alkylation of aring system may result in alkylation at multiple sites, the invention expressly includes all such reaction products). All such isomeric forms of such compounds are expressly included in the present invention.
• Synthetic chemistry transformations andprotecting group methodologies useful in synthesizing the applicable compounds are known in the art and include, for example, those described in Larock R, Comprehensive Organic Transformations , VCH Publishers (1989); Greene, TW et al, Protective Groups in Organic
• a salt may be formed with a suitable cation
• suitable inorganic cations include, but are not limited to, alkali metal ions such as Na + and K + ,
• alkaline earth cations such as Ca and Mg
• other cations such as Al
• suitable organic cations include, but are not limited to, ammonium ion (i.e., NH 4 + ) and substituted ammonium ions (e.g., NH 3 R , NH 2 R , NHR , NR ).
• suitable substituted ammonium ions are those derived from ethylamine, diethylamine,
• dicy clone xylamine triethylamine, butylamine, ethylenediamine, ethanolamine, diethanolamine, piperazine, benzylamine, phenylbenzylamine, choline, meglumine, andtromethamine, as well as amino acids, such as lysine and argjnine.
• An example of a common quaternary ammonium ion is N(CH 3 ) 4 + .
• a salt may be formed with a suitable anion.
• suitable inorganic anions include, but are not limitedto, those derived from the following inorganic acids:
• hydrochloric hydrobromic, hydroiodic, sulfuric, sulfurous, nitric, nitrous, phosphoric, and phosphorous.
• Suitable organic anions include, but are not limitedto, those derived from the following organic acids: 2-acetyoxybenzoic, acetic, ascorbic, asp artic, benzoic,
• suitable polymeric organic anions include, but are not limitedto, those derived from the following polymeric acids: tannic acid, carboxymethyl cellulose.
• a reference to a particular compound also includes salt forms thereof.
• compositions may be formulated together with a pharmaceutically acceptable carrier or adjuvant into pharmaceutically acceptable compositions prior to be administered to a subject.
• pharmaceutically acceptable compositions further comprise additional therapeutic agents in amounts effective for achieving a modulation of disease or disease symptoms, including those described herein.
• pharmaceutically acceptable carrier or adjuvant refers to a carrier or adjuvant that may be administered to a subject, together with a compound of this invention, and which does not destroy the pharmacological activity thereof and is nontoxic when administered in doses sufficient to deliver a therapeutic amount of the compound.
• Pharmaceutically acceptable carriers, adjuvants and vehicles that may be used in the pharmaceutical compositions of this invention include, but are not limited to, ion exchangers, alumina, aluminum stearate, lecithin, self- emulsifying drug delivery systems (SEDDS) such as d- ⁇ -tocopherol polyethyleneglycol 1000 succinate, surfactants used in pharmaceutical dosage forms such as Tweens or other similar polymeric delivery matrices, serum proteins, such as human serum albumin, buffer substances such as phosphates, glycine, sorbic acid, potassium sorbate, partial glyceride mixtures of saturated vegetable fatty acids, water, salts or electrolytes, such as protamine sulfate, disodium hydrogen phosphate, potassium hydrogen phosphate, sodium chloride, zinc salts, colloidal silica, magnesium trisilicate, polyvinylpyrrolidone, cellulose-based substances, polyethylene glycol, sodium carboxymethylcellulose, polyacrylates, waxes, poly
• Cyclodextrins such as ⁇ -, ⁇ -, and ⁇ -cyclodextrin, or chemically modified derivatives such as hydroxy alkylcyclodextrins, including 2- and 3-hydroxypropyl- -cyclodextrins, or other solubilized derivatives may also be advantageously usedto enhance delivery of compounds of the formulae described herein.
• compositions of this invention may be administered orally, parenterally, by inhalation spray, topically, rectally , nasally, buccally, vaginally or via an implanted reservoir, preferably by oral administration or administration by injection.
• the pharmaceutical compositions of this invention may contain any conventional non-toxic pharmaceutically -accept able carriers, adjuvants or vehicles.
• thepH of the formulation may be adjusted with pharmaceutically acceptable acids, bases or buffers to enhance the stability of the formulated compound or its delivery form.
• parenteral as used herein includes subcutaneous, intracutaneous, intravenous, intramuscular, intraarticular, intraarterial, intrasynovial, intrasternal, intrathecal, intralesional and intracranial injection or infusion techniques.
• compositions may be in the form of a sterile injectable preparation, for example, as a sterile injectable aqueous or oleaginous suspension.
• This suspension may be formulated according to techniques known in the art using suitable dispersing or wetting agents
• the sterile inject able preparation may also be a sterile injectable solution or suspension in a non-toxic parenterally acceptable diluent or solvent, for example, as a solution in 1 ,3-butanediol.
• a non-toxic parenterally acceptable diluent or solvent for example, as a solution in 1 ,3-butanediol.
• acceptable vehicles and solvents that may be employed are mannitol, water, Ringer's solution and isotonic sodium chloride solution.
• sterile, fixed oils are conventionally employed as asolvent or suspending medium.
• any bland fixed oil may be employed including synthetic mono- or diglycerides.
• Fatty acids such as oleic acid and its glyceride derivatives are useful in the preparation of injectables, as are natural pharmaceutically-acceptable oils, such as olive oil or castor oil, especially in their polyoxyethylated versions.
• These oil solutions or suspensions may also contain a long-chain alcohol diluent or dispersant, or carboxymethyl cellulose or similar dispersing agents which are commonly used in the formulation of pharmaceutically acceptable dosage forms such as emulsions and or suspensions.
• Other commonly used surfactants such as Tweens or Spans and/or other similar emulsifyingagents or bioavailability enhancers which are commonly used in the manufacture of pharmaceutically acceptable solid, liquid, or other dosage forms may also be used for the purposes of formulation.
• compositions of this invention may be orally administered in any orally acceptable dosage form including, but not limited to, capsules, tablets, emulsions and aqueous suspensions, dispersions and solutions.
• carriers which are commonly used include lactose and corn starch.
• Lubricatingagents such as magnesium stearate, are also typically added.
• useful diluents include lactose and dried corn starch.
• compositions of this invention may also be administered in the form of suppositories for rectal administration.
• These compositions can be prepared by mixing a compound of this invention with a suitable non-irritating excipient which is solid at room temperature but liquid at the rectal temperature and therefore will melt in the rectum to release the active components.
• suitable non-irritating excipient include, but are not limited to, cocoa butter, beeswax and polyethylene glycols.
• Topical administration of the pharmaceutical compositions of this invention is useful when the desired treatment involves areas or organs readily accessible by topical application.
• the pharmaceutical composition should be formulated with a suitable ointment containing the active components suspended or dissolved in a carrier.
• Carriers for topical administration of the compounds of this invention include, but are not limited to, mineral oil, liquid petroleum, white petroleum, propylene glycol, poly oxy ethylene
• the pharmaceutical composition can be formulated with a suitable lotion or cream containing the active compound suspended or dissolved in a carrier with suitable emulsifying agents.
• suitable carriers include, but are not limited to, mineral oil, sorbitan monostearate, polysorbate 60, cetyl esters wax, cetearyl alcohol, 2-octyldodecanol, benzyl alcohol and water.
• the pharmaceutical compositions of this invention may also be topically applied to the lower intestinal tract by rectal suppository formulation or in a suitable enema formulation. Topically -transdermal patches are also included in this invention.
• compositions of this invention may be administered by nasal aerosol or inhalation
• Such compositions are prepared accordingto techniques well-known in the art of pharmaceutical formulation and may be prepared as solutions in saline, employing benzyl alcohol or other suitable preservatives, absorptionpromoters to enhance bioavailability, fiuorocarbons, and/or other solubilizing or dispersing agents known in the art.
• compositions of this invention comprise a combination of a compound of the formulae described herein and one or more additional therapeutic or prophylactic agents
• both the compound and the additional agent should be present at dosage levels of between about 1 to 100%, and more preferably between about 5 to 95% of the dosage normally administered in a monotherapy regimen.
• the additional agents may be administered separately, as part of a multiple dose regimen, from the compounds of this invention. Alternatively, those agents may be part of a single dosage form, mixed together with the compounds of this invention in a single composition
• the compounds described herein can, for example, be administered by injection, intravenously, intraarterially, subdermally, intraperitoneally, intramuscularly, or subcutaneously; or orally, buccally, nasally, transmucosahy , topically, in an ophthalmic preparation, or by inhalation, with a dosage ranging from about 0.5 to about 100 mg kg of body weight, alternatively dosages between 1 mg and 1000 mgdose, every 4 to 120 hours, or according to the requirements of theparticular drug
• the methods herein contemplate administration of an effective amount of compound or compound composition to achieve the desired or stated effect.
• the pharmaceutical compositions of this invention will be administered from about 1 to about 6 times per day or alternatively, as a continuous infusion.
• Such administration can be used as a chronic or acute therapy.
• the amount of active ingredient that may be combined with the carrier materials to produce a single dosage form willvary dep ending up on the host treated and the particular mode of administration.
• a typical preparation will contain from about 5% to about 95% active compound (w/w).
• such preparations contain from about 20% to about 80% active compound.
• a maintenance dose of a compound, composition or combination of this invention may be administered, if necessary. Subsequently, the dosage or frequency of administration, or both, may be reduced, as a function of the symptoms, to a level at which the improved condition is retained when the symptoms have been alleviated to the desired level. Subjects may, however, require intermittent treatment on a long- term basis upon any recurrence of disease symptoms.
• compositions described above comprising a comp ound of formulal, II, Il-a, II-a-1 , Il-b, or II-b-1 or a compound described in any one of the embodiments herein, may further comprise another therapeutic agent useful for treating cancer.
• a method for inhibiting a mutant IDH1 or IDH2 activity comprising contacting a subject in need thereof with acompound (includingits tautomers and/or
• the cancer to be treated is characterized by a mutant allele of IDH1 or IDH2 wherein the lDH l or IDH2 mutation results in a new ability of the enzyme to catalyzethe NAPH-dependent reduction of a-ketoglutarate to ?(-)-2-hydroxyglutarate in a subject.
• the mutant IDH 1 has an R132X mutation.
• the R132X mutation is selected fromR132H, R132C, R132L, R132V, R132S and R132G. In another aspect, the R132X mutation is R132H or R132C. Inyet another aspect, the R132X mutation is R132H. Also provided are methods of treating a cancer characterized by the presence of a mutant allele of IDH1 comprisingthe step of administering to subject in need thereof (a) a compound of formula I, II, Il-a, ⁇ -a-l , Il-b, or II-b-1, or a compound described in any one of the embodiments herein, or a pharmaceutically acceptable salt thereof, or (b) a pharmaceutical composition comprising(a) and a pharmaceutically acceptable carrier.
• the cancer to be treated is characterized by a mutant allele of IDH 1 wherein the IDH 1 mutation results in a new ability of the enzyme to catalyze the NAPH- dependent reduction of ⁇ -ketoglutarate to i?(-)-2-hydroxyglutarate in a patient.
• the IDH1 mutation is an R132X mutation. In another asp ect ofthis
• the R132X mutation is selected fromR132H, R132C, R132L, R132V, R132S and R132G. In another asp ect, the R132X mutation is R132 H or R132C.
• a cancer can be analyzed by sequencing cell samples to determine the presence and specific nature of (e.g., the changed amino acid present at) a mutation at amino acid 132 of IDH 1.
• the comp ounds and methods of this invention are useful to treat ary type of cancer that is characterized by the presence of a mutant allele of IDH1 imparting such acitivity and in particular an IDH 1 R132H or R132C mutation.
• the efficacy of cancer treatment is monitored by measuring the levels of 2HG in the subject.
• levels of 2HG are measured prior to treatment, wherein an elevated level is indicated for the use of the compound of formula I, II, ⁇ -a, II-a-1 , Il-b, or II-b-1 or a comp ound described in any one of the embodiments described herein to treat the cancer.
• the level of 2HG is determined during the course of and/or following termination of treatment to establish efficacy .
• the level of 2HG is only determined during the course of and/or following termination of treatment. A reduction of 2HG levels during the course of treatment and foUowing treatment is indicative of efficacy.
• a determination that 2HG levels are not elevated during the course of or foUowingtreatment is also indicative of efficacy.
• the these 2HG measurements will be utilized together with other well-known determinations of efficacy of cancer treatment, such as reduction in numb er and size of tumors and/or other cancer- associated lesions, improvement in the general health ofthe subject, and alterations in other biomarkers that are associated with cancer treatment efficacy.
• 2HG can be detected in a sample by LC/MS.
• the sample is mixed 80:20 with methanol, and centrifuged at 3,000 rpm for 20 minutes at 4 degrees Celsius.
• the resulting supernatant can be collected and stored at -80 degrees Celsius prior to LC-M S MS to assess 2-bydroxyglutarate levels.
• LC-M S MS liquid chromatography
• M etabolites can be separated by reversed phase chromatography using 10 mM tributyl-amine as an ion pairing agent in the aqueous mobile phase, according to a variant of apreviously reported method (Luo et al. J Chromatogr A 1 147, 153-64, 2007).
• Another method is specific for 2-hydroxyglutarate, running a fast linear gradient from 50% -95% B (buffers as defined above) over 5 minutes.
• a Synergi Hydro-RP, 100mm x 2 mm, 2.1 ⁇ particle size (Phenomonex) canbe used as the column, as described above.
• M etabolites can be quantified by comp arison of peak areas with pure metabolite standards at known concentration.
• M etabolite flux studies from 13 C-glutamine can be performed as described, e.g., in Munger et al. Nat Biotechnol 26, 1 179-86, 2008.
• 2HG is directly evaluated.
• a derivative of 2HG formed in process of p erforming the analytic method is evaluated.
• a derivative can be a derivative formed in M S analysis.
• Derivatives can include asalt adduct, e.g., a Na adduct, a hydration variant, or a hydration variant which is also a salt adduct, e.g., aNa adduct, e.g., as formed in M S analysis.
• a metabolic derivative of 2HG is evaluated.
• examples include species that build up or are elevated, or reduced, as a result of the presence of 2HG, such as glutarate or glutamate that will be correlated to 2HG, e.g., R-2HG.
• Exemplary 2HG derivatives include dehydrated derivatives such as the compounds rovided below or a salt adduct thereof:
• the cancer is atumor wherein at least 30, 40, 50, 60, 70, 80 or 90% of the tumor cells carry an IDHl mutation, and in particular an IDHl R132H or R132C mutation, at the time of diagnosis or treatment.
• IDHl R132X mutations are known to occur in certain types of cancers as indicated in Table 2, below.
• IDHl R132H mutations have been identified in glioblastoma, acute myelogenous leukemia, sarcoma, melanoma, non-smallcell lung cancer, cho lan gio carcinomas,
• chondrosarcoma m elodysplastic syndromes (MDS), myeloproliferative neo lasm (MPN), colon cancer, and angio-immunoblastic non-Hodgkin's lymphoma (NHL).
• MDS m elodysplastic syndromes
• MPN myeloproliferative neo lasm
• colon cancer colon cancer
• NDL angio-immunoblastic non-Hodgkin's lymphoma
• the methods described herein are used to treat glioma (glioblastoma), acute myelogenous leukemia, sarcoma, melanoma, non-small cell lun g cancer (NSC LC) or cho lan gio carcinomas, chondrosarcoma, my elodys lastic syndromes (MDS), myeloproliferative neoplasm (MPN), colon cancer, or angio-immunoblastic non-Hodgkin's lymphoma (NHL) in a patient.
• glioma glioblastoma
• NSC LC non-small cell lun g cancer
• MDS myelodys lastic syndromes
• MDN myeloproliferative neoplasm
• COL angio-immunoblastic non-Hodgkin's lymphoma
• the cancer is a cancer selected from any one of the cancer types listed in Table 2, and the IDH R132X mutation is one or more of the IDHl R132X mutations listed in Table 2 for that particular cancer type.
• Treatment methods described herein can additionally comprise various evaluation steps prior to and/or following treatment with acompound of formulal, II, Il-a, II-a-1, Il-b, or II-b-1 or acompound described in any one of the embodiments described herein.
• the method further comprises the step of evaluating the growth, size, weight, invasiveness, stage and/or other phenotype of the cancer.
• the method further comprises the step of evaluating the IDHl genotype ofthe cancer. This may be achieved by ordinary methods in the art, such as DNA sequencing, immuno analysis, and/or evaluation of the presence, distribution or level of 2HG.
• the method further comprises the step of determining the 2HG level in the subject. This may be achieved by spectroscopic analysis, e.g., magnetic resonance-based analysis, e.g., MRI and/or M RS measurement, sample analysis of bodily fluid, such as serum or spinal cord fluid analysis, or by analysis of surgical material, e.g., by mass -sp ectroscopy .
• spectroscopic analysis e.g., magnetic resonance-based analysis, e.g., MRI and/or M RS measurement
• sample analysis of bodily fluid such as serum or spinal cord fluid analysis
• surgical material e.g., by mass -sp ectroscopy
• the methods described herein comprise the additional step of coadministering to a subject in need thereof a second therapy e.g., an additional cancer therapeutic agent or an additional cancer treatment.
• additional cancer therapeutic agents include for example, chemotherapy, targeted therapy, antibody therapies, immunotherapy, and hormonal therapy .
• Additional cancer treatments include, for example: surgery, and radiation therapy . Examples of each of these treatments are provided below.
• co-administering means that the additional cancer therapeutic agent may be administered together with a compound of this invention as p art of a single dosage form (such as a composition of this invention comprising a compound of the invention and an second therapeutic agent as described above) or as separate, multiple dosage forms.
• the additional cancer therapeutic agent may be administered prior to, consecutively with, or following the administration of a compound of this invention.
• both the compounds of this invention and the second thera eutic agent(s) are administered by
• composition of this invention comprising both a compound of the invention and a second therap eutic agent
• administration of a composition of this invention, comprising both a compound of the invention and a second therap eutic agent, to a subject does not preclude the separate administration of that same therapeutic agent, any other second therapeutic agent or any compound of this invention to said subject at another time during a course of treatment.
• co-administering as used herein with respect to an additional cancer treatment means that the additional cancer treatment may occur prior to, consecutively with, concurrently with or following the administration of a comp ound of this invention.
• the additional cancer therapeutic agent is a chemotherapy agent.
• chemotherapeutic agents used in cancer therapy include, for example,
• antimetabolites e.g., folic acid, purine, and pyrimidine derivatives
• alky lating agents e.g., nitrogen mustards, nitrosoureas, platinum, alkyl sulfonates, hydrazines, triazenes, aziridines, sp indle poison, cytotoxic agents, topoisomerase inhibitors and others
• hyp omethy lating agents e.g., decitabine (5-aza-deoxycytidine), zebularine, isothiocyanates, azacitidine (5- azacytidine, 5-flouro-2'-deoxycytidine, 5,6-dihydro-5-azacytidine and others).
• agents include Aclarubicin, Actinomycin, Alitretinoin, Altretamine, Aminopterin, Aminolevulinic acid, Amrubicin, Amsacrine, Anagrelide, Arsenic trioxide, Asparaginase, Atrasentan, Belotecan, Bexarotene, bendamustine, Bleomycin, Bortezomib, Busulfan, Camptothecin, Capecitabine, Carbop latin, Carboquone, Carmofur, Carmustine, Celecoxib, Chlorambucil, Chlormethine, Cisplatin, Cladribine, Clofarabine, Crisantaspase, Cyclophosphamide, Cytarabine, dacarbazine, Dactinomycin, Daunorubicin, Decitabine, Demecolcine, Docetaxel, Doxorubicin, Efaproxiral, Elesclomol, Elsamitrucin, En
• Floxuridine Fludarabine, Fluorouracil (5FU), Fotemustine, Gemcitabine, Gliadel implants, Hydroxy carbamide, Hydroxyurea, Idarubicin, Ifosfamide, Irinotecan, Irofulven, Ixabepilone, Larotaxel, Leucovorin, Liposomal doxorubicin, Liposomal daunorubicin, Lonidamine,
• two or more drugs are often given at the same time.
• two or more chemotherapy agents are used as combination chemotherapy.
• the additional cancer therapeutic agent is a differentiation agent.
• Such differentiation agent includes retinoids (such as all-trans-retinoic acid (ATRA), 9-cis retinoic acid, 13-cis-retinoic acid (13-cRA) and 4-hydroxy-phenretinamide (4-HPR)); arsenic trioxide; histone deacetylase inhibitors HDACs (such as azacytidine (Vidaza) and butyrates (e.g., sodium pheny lbutyr ate)); hybrid polar compounds (such as hexamethylene bisacetamide ((HMB A)); vitamin D; and cytokines (such as colony -stimulating factors including G-CSF and GM-CSF, and interferons).
• retinoids such as all-trans-retinoic acid (ATRA), 9-cis retinoic acid, 13-cis-retinoic acid (13-cRA) and 4-hydroxy-phenretinamide (4-HPR)
• the additional cancer therapeutic agent is a targeted therapy agent.
• Targeted therapy constitutes the use of agents specific for the deregulated proteins of cancer cells.
• Small molecule targeted therapy drugs are generally inhibitors of enzymatic domains on mutated, overexpressed, or otherwise critical proteins within the cancer cell.
• Prominent examp les are the tyrosine kinase inhibitors such as Axitinib, Bosutinib, Cediranib, dasatinib, erlotinib, imatinib, gefitinib, lapatinib, Lestaurtinib, ilotinib, Semaxanib, Sorafenib, Sunitinib, and Vandetanib, and also cyclin-dependent kinase inhibitors such as Alvocidib and Seliciclib.
• Monoclonal antibody therapy is another strategy in which the therapeutic agent is an antibody which sp ecifically binds to a protein on the surface of the cancer cells.
• Examples include the anti- HER2/neu antibody trastuzumab (HERCEPTIN®) typically used in breast cancer, and the anti- CD20 antibody rituximab and Tositumomab typically used in a variety of B-cell malignancies.
• Other exemplary antibodies include Cetuximab, Panitumumab, Trastuzumab, Alemtuzumab, Bevacizumab, Edreco lomab, and Gemtuzumab.
• Exemplary fusion proteins include Aflib ercept and Denileukin diftitox.
• the targeted therapy can be used in combination with a compound described herein, e.g., abiguanide such as metformin or phenformin, preferably phenformin.
• Targeted therapy can also involve small peptides as "homing devices” which can bind to cell surface receptors or affected extracellular matrix surrounding the tumor. Radionuclides which are attached to these peptides (e.g., RGDs) eventually kill the cancer cell if the nuclide decays in the vicinity of the cell.
• RGDs Radionuclides which are attached to these peptides
• An example of such therapy includes BEXXAR®.
• the additional cancer therapeutic agent is an immunotherapy agent.
• Cancer immunotherapy refers to a diverse set of therap eutic strategies designed to induce the subject's own immune system to fight the tumor. Contemporary methods for generating an immune resp onse against tumors include intravesicular BCG immunotherapy for superficial bladder cancer, and use of interferons and other cytokines to induce an immune response in renal cell carcinoma and melanoma subjects.
• Allogeneic hematopoietic stem cell transplantation can be considered a form of immunotherapy, since the donor's immune cells will often attack the tumor in a graft -versus- tumor effect.
• the immunotherapy agents can be used in combination with a compound or composition described herein.
• the additional cancer therapeutic agent is a hormonal therapy agent.
• the growth of some cancers can be inhibited by providing or blocking certain hormones.
• hormone-sensitive tumors include certain types of breast andprostate cancers. Removingor blo cking estrogen or testosterone is often an important additional treatment.
• administration of hormone agonists, such as progestogens may be therapeutically beneficial.
• the hormonal therapy agents can be used in combination with a comp ound or a composition described herein.
• therap eutic modalities include imatinib, gene therapy, peptide and dendritic cell vaccines, synthetic chlorotoxins, and radiolabeled drugs and antibodies.
• Step A Tert-butyl 3-oxocyclobutylcarbamate.
• 3-oxocyclobutanecarboxylic acid 10 g 88 mmol
• dry DCM 60 mL
• SOCl 2 20 mL
• the mixture was heatedto reflux for 1.5 h and then evaporated in vacuo.
• the resulting mixture was co-evaporated twice with toluene (2 x 8 mL) and the residue was dissolved in acetone (30 mL), followed by adding dropwise to a solution of NaN 3 (12 g 185.0 mmol) in H 2 0 (35 mL) at 0 °C.
• StepB Tert-butyl 3,3-difluorocyclobutylcarbamate.
• DAST diethylaminosulfur trifluoride
• Step C N-(3,3-difhorocyclobutyl)formamide.
• M eOH 170 mL
• CH 3 COCl 65 mL
• tert-butyl 3,3-difluoro -cyclobutylcarbamate 12.1 g, 58.42 mmol
• the reaction mixture was stirred at 0 °C for 20 min, and then allowed to warm up to r.t and stirred for another 1.5 h.
• the reaction mixture was concentrated and dissolved in H 2 0 (200 mL).
• Step D l,l-Difluoro-3-isocyanocyclobutane.
• N-(3,3-difluorocyclobutyl) - formamide 2.0 g, 14.81 mmol
• PPh 3 4.27 g, 16.29 mmol
• DCM 35 mL
• CCU 1 .43 mL, 14.81 mmol
• TEA 2.06 mL, 14.81 mmol
• the reaction mixture was stirred at 45 °C overnight under a N 2 atmosphere.
• the resulting mixture was evaporated in vacuo at 0 °C.
• the residue was suspended in Et20 (25 mL) at 0 °C for 30 min and then filtered.
• the filtrate was evaporated to about 5 mL at 0 °C under reduced pressure.
• the residue was purified by column chromatography using Et 2 0 as eluent to afford the desired product which was used directly in the next step.
• Step A Benzyl 3-oxocyclobutanecarboxylate.
• a mixture of 3-oxocycIobutanecarboxylic acid (5 g, 44 mmol), potassium carbonate ( 12 g, 88 mmol) and benzyl bromide (1 1.2 g, 66 mmol) in acetone (50 mL) was refluxed for 1 h.
• the solvent was then removed under reduced pressure and the residue was partitioned between ethyl acetate and water. Combined organic layers were dried over anhydrous MgSC , filtered and concentrated.
• Step B Benzyl 3, 3-difluorocyclobutanecarboxylate.
• DCM 35 mL
• DAST 0.8 mL, 6.03 mmol
• Step C 3,3-Difluorocyclobutanecarboxylic acid Benzyl 3,3-difiuorocyclobutanecarboxylate (0.84 g, 3.72 mo 1) was dissolved m ethanol (40 mL), and approximately 0.02 gpalladium on activated carbon was added. The mixture was stirred at room temperature for 12 h under the atmosphere of H 2 and then filtered through a pad of Celite. The filtrates were concentrated and dried in vacuo to give the desired compound. 1H NMR (400 MHz, CDC1 3 ): ⁇ 3.16— 2.55 (m, 5H). StepD: Tert-butyl 3,3-difluorocyclobutylcarbamate.
• Step E 3,3-Difluorocyclobutanamine hydrochloride.
• M eOH 170 mL
• CH 3 COCl 65 mL
• iert-butyl 3,3-difiuorocyclobutylcarbamate 12.1 g, 58.4 mmol
• the mixture was stirred at 0 °C for 20 min and then allowed to warm up to roomtemperature.
• the reaction mixture was stirred for another 1.5 h and then concentrated to give the crude product which was precipitated in ether to givethe desired product as a white solid.
• Step F N-(3,3-difhorocyclobutyl)formamide.
• the mixture of 3,3-difluorocyclobutanamine hydrochloride (6.5 g, 60.7 mmol) and TEA (3 eq) in HCOOEt (90 mL) was stirred at 80 °C overnight in a sealed pressure tube.
• the solvent was removed in vacuo and the residue was purified by column chromatography with 50% petroleum ether / EtOAc to 25%petroleum ether /
• Step A Tert-butyl 3-hydroxycyclobutylcarbamate.
• /er/-butyl 3- oxocyclobutylcarbamate 2 g, 10.8 mmol, 2 eq
• EtOH 20 mL
• NaBH 4 204 mg, 1 eq
• the mixture was then allowed to warm to room temperature and stirred for 30 min.
• the mixture was concentrated in vacuo and the residue was purified by column chromatography using petroleum ether / EtOAc (V:V, 2: 1 to pure EtOAc) as eluent to afford the desired product as a white solid.
• Step B Tert-butyl 3-fluorocyclobutylcarbamate.
• DCM dry DCM (20 mL) at -70 °C
• DAST dropwise l g, 0.85 mL, 1 .17 eq
• the mixture was then slowly warmed to room temperature and stirred overnight.
• the resulting mixture was washed with diluted aq. NaHC0 3 .
• the organic layer was dried over anhydrous Mg 2 S0 4 and concentrated.
• Step C 3-Fluorocyclobutanamine.
• the compound was synthesized as outlined in step E of method A set forth above.
• Step D N ⁇ (3-fluorocyclobutyl)formamide.
• the compound was synthesized as outlined in step F of method A set forth above.
• ⁇ 1MMR 400 MHz, CDC1 3 ): ⁇ 8.10 (s, 1 H), 5.94-5.89 (brs, 1 H), 5.32-5.25 (m, 0.5H), 5.18-5.1 1 (m, 0.5H), 4.63-4.42 (m, 1 H), 2.76-2.62 (m, 2H), 2.44-2.31 (m, 2H).
• Step E l-Fluoro-3-isocyanocyclobutane.
• the compound was synthesized via the general procedure as the step G in method A set forth above.
• Step A Tert-butyl 4-hydroxycyclohexylcarbamate.
• 4-aminocyclohexanol 23 g, 0.2 mol
• Et 3 N 60 g, 0.6 mol
• THF 230 mL
• EtOAc 3 x 200 mL
• the combined organic layers were washed with water (2 x 200 mL) and brine (200 mL), dried over anhydrous Na 2 S04 and concentrated.
• the residue was purified by column chromatography on silica gel using DCM/ MeOH (V:V, 20: 1 ) to afford the desired product as a white solid.
• Step B Tert-butyl 4-oxocyclohexylcarbamate.
• DCM DCM
• Dess-Martin periodinane 39.4 g, 92.9 mmol
• the resulting solution was stirred at room temperature overnight, quenched with aq. Na 2 S 2 0 3 solution and extracted with DCM (3 x 100 mL).
• the combined organic layers were washed with water (2 x 100 mL) and brine (100 mL), dried over anhydrous aiSC , and concentrated.
• the residue was purified by column chromatography on silica gel using petroleum ether / EtOAc (V:V, 10: 1 ) to afford desired product as a white solid.
• Step C Tert-butyl 4,4-difluorocyclohexylcarbamate.
• DCM dry DCM
• DAST 2.58 g, 16 mmol
• the reaction mixture was stirred at r.t overnight.
• the reaction mixture was poured into ice water slowly and extracted with DCM ( 3 x 100 mL). The combined organic layers were washed with 2 N aq. NaHC0 3 and brine, dried over anhydrous Na 2 S0 4 , filtered and concentrated in vacuo.
• Step D 4,4-Difluorocyclohexanamine hydrochloride.
• a mixture of iert-butyl4,4-difluorocyclo- hexyl carbamate (6.0 g, 25.5 mmol) and 6 N HCl/MeOH (60 mL) was stirred at room temperature for 2 h.
• the reaction mixture was concentrated to give the crude product which was directly used in next step without further purification.
• M S 136.1 (M + l) + .
• Step E N-(4,4-difhorocyclohexyl)formamide.
• a mixture of 4,4-difluorocyclohexanamine (crude 3.4 g 25.2 mmol), TEA (3 eq) and ethyl formate (35 mL) was stirred at 1 10 °C overnight in a sealed tank. The solvent was removed and the residue was purified by column
• Step F l,l-Difluoro-4-isocyanocyclohexane.
• a mixture of N-(4,4-difiuorocyclohexyI) - formamide (2.5 g, 15.3 mmol), PPh 3 (4.4 g, 16.8 mmol), CC1 4 (2.3 g, 15.1 mmol), Et 3 N (1.5 g, 14.9 mmol) and DCM (50 mL) was heatedto 45 °C and stirred overnight. The resulting mixture was evaporated in vacuo and the residue was suspended in Et 2 0 (125 mL) at 0 °C. The filtrate was concentrated and the residue was purified by column chromatography on silica geleluting with Et 2 0 to afford the desired product as a yellow oil which was used directly in the next step.
• Step A 2-(3-N rophenoxy)ethanol.
• a suspension of 3-nitrophenol ( 1 g, 7.2 mmol), 2- bromoethanol ( 1 .2 g, 9.6 mmol) and K 2 C0 3 (2 g, 14.4 mmol) in MeCN ( 12 mL) was stirred at 90 °C overnight.
• the precipitate was collected by filtration to give the first batch of product.
• the filtrate was concentrated and the residue was purified by column chromatography to afford another batch of the desired product as a yellow solid.
• Step B 2-(3-Aminophenoxy)ethanol.
• 2-(3-nitrophenoxy)ethanol 500 mg, 2.7 mmol
• NH 4 C1 720 mg, 1 3.5 mmol
• EtOH 10 mL
• iron powder 900 mg, 16.2 mmol
• the reaction was then stirred at 90 °C for 2 hr and subsequently cooled.
• the mixture was filtered and the filtrate was concentrated.
• the resulting residue was purified by column chromatography to afford the desired product as a yellow solid.
• Step A Tert-butyl 4-(4,4,5,5-tetramethyl-l,3,2-dioxaborolan-2-yl)-lH-pyrazole-l-carboxylate.
• Step B 4-(3-Nitrophenyl)-l H-pyrazole.
• tert-butyl 4-(4,4,5,5-tetramethyl-l ,3,2- dioxaborolan-2-yl)- l H-pyrazole- l -carboxylate 300 mg, 0.82 mmol
• l -bromo-3-nitrobenzene 137 mg, 0.68 mmol
• Na 2 C0 3 216 mg, 2.04 mmol
• DME/H 2 0 5 mL/ 1 mL
• N 2 was added Pd(PPh 3 ) 2 Cl2 (24 mg, 0.034 mmol).
• Step C 3-(lH ⁇ pyrazol-4-yl)aniline.
• Iron powder (296 mg, 5.30 mmol) was added to a solution of 4-(3-nitrophenyl)- l H-pyrazole (200 mg, 1 .06 mmol) in AcOH/EtOH (2 mL/3 mL).
• the reaction mixture was stirred at 90 °C for 2 hr and then cooled to room temperature.
• the reaction mixture was filtered through Celite. The filter cake was washed with H 2 0.
• the combined organic layers were washed with brine, dried over anhydrous Na 2 S0 4 , and concentrated.
• the resulting residue was purified by column chromatography to afford the desired product.
• MS 160.2 (M+ l ) + .
• Step A Ethyl 3-(dibenzylamino)benzoate 2.
• Et 3 N 5.26 mL, 0.036 mmol
• CH 3 CN 30 mL
• BnBr 4.32 mL, 0.036 mmol
• the reaction mixture was heated to reflux for 18 hr and then cooled to room temperature.
• Step B 2-(3-(dibenzylamino)phenyl)propan-2-ol.
• MeMgBr 3 M sol. in THF, 5.58 mL, 16.7 mmol
• the reaction was stirred at room temperature overnight and quenched by addition of saturated NH 4 C1.
• the resulting mixture was extracted with ethyl acetate (3 x 50 mL).
• Step C 2-(3-aminophenyl)propan-2-ol.
• 2-(3-(dibenzylamino)phenyl)propan-2- ol (268 mg. 0.81 mmol) in MeOH (5 mL) was added 10% Pd/C (27 mg) in one portion. The reaction mixture was hydrogenated at room temperature overnight under hydrogen atmosphere.
• Step A Methyl 3-fluoro-5-nltrobenzoate.
• Thionyl chloride (488 mg, 4.1 mmol) was added dropwise to a solution of 3-fluoro-5-nitrobenzoic acid (500 mg, 2.7 mmol) in dry methanol (10 mL) at 0 °C under nitrogen atmosphere.
• the reaction was warmed to room temperature and stirred for 6 hr.
• the reaction mixture was concentrated under reduced pressure to obtain the corresponding methyl ester hydrochloride as a waxy solid which was used directly in the next step.
• MS 200 (M+ l ) + .
• Step B Methyl 3-atnino-5-fluorobenzoate.
• methyl 3-fluoro-5-nitrobenzoate 400 mg, 2 mmol
• iron powder 560 mg, 10 mmol
• ammonium chloride 540 mg, 10 mmol
• the reaction mixture was stirred at 80 °C for 1 hr. After cooling the reaction, the mixture was filtered through Celite. The filtrate was concentrated under reduced pressure to give the desired product.
• Step C Methyl 3-(dibenzylamino)-5-fluorobenzoate.
• methyl 3-amino-5- fluorobenzoate 440 mg, 2.6 mmol
• NaH 1 87 mg, 7.8 mmol
• benzyl bromide 1 . 1 g, 6.5 mmol
• Step D 2-(3-(Dibenzylamino)-5-fluorophenyl)propan-2-ol.
• Methylmagnesium bromide (1 M in THF, 2.4 mL, 2.4 mmol) was dissolved in THF (5 mL) and placed in an ice-water bath.
• Methyl 3-(dibenzylamino)-5-fluorobenzoate (280 mg, 0.8 mmol) in THF (5 mL) was then slowly added to the reaction mixture. This mixture was stirred for 3 hr while maintaining an internal temperature range between 1 5 to 25 °C.
• Step A Ethyl 3-(dlbenzylamino)benzoate.
• Et 3 N 5.26 mL, 0.036 mmol
• CH 3 CN 30 mL
• BnBr 4.32 mL, 0.036 mmol
• Step A (3-Fluoro-5-nitrophenyl)(methyl)sulfane
• 3-fiuoro-5-nitroaniline 200 mg, 1.28 mmol
• l ,2-dimethyldisulfane 121 mg, 1.29 mmol
• CH 3 CN 3 CN
• Neat isoamyl nitrite 150 mg, 1.28 mmol
• the reaction mixture was slowly heatedto reflux over 10 min and maintained at a gentle refluxuntilN 2 evolution ceased (30-60 min).
• the reaction mixture was cooled and the solvent was removed in vacuo to afford a dark oil.
• the resulting oil was purified by column chromatography to give the desired product as apale yellow solid.
• StepB 3-Fluoro-5-(methylthio)aniline.
• M eOH M eOH
• Pd/C 10% Pd/C
• Step A (S )-3-Amino-2-(((benzyloxy)carbonyl)amino)propanoic acid.
• PIAD PI-decanediol
• Step B (S)-M ethyl 3-amino-2-(((benzyloxy)carbonyl)amino)propanoate hydrochloride.
• SOCl 2 5 mL
• the resulting mixture was stirred at 0 °C for 0.5 h before (S)-3-amino-2-(((benzyloxy)carbonyl)amino) propanoic acid (2.6 g, 10 mmol) was added. Then the reaction mixture was stirred at room temperature overnight and concentrated in vacuo to afford the desired product.
• M S 253.1 (M+l) + .
• Step C (S)-M ethyl 3-((2-(benzyloxy)-2-oxoethyl)amino)-2-(((benzyloxy)carbonyl)amino)pro- paneate.
• Step D ( S )-M ethyl 3-((2-(benzyloxy)-2-oxoethyl)( tert-butoxycarbonyl)amino)-2-( ((benzyloxy) carbonyl)amino)pmpanoate.
• Step E (S)-2-((2-Amino-3-methoxy-3-oxopropyl)(tert-butoxycarbonyl)amino)acetic acid.
• (S)-methyl 3-((2-(benzyloxy)-2-oxoethyl)(tert-butoxycarbonyl)amino)-2-(((benzyl- oxy)carbonyl)amino)propanoate (2.5 g, 5 mmol) in M eOH (30 mL) was added 10% PdC (250 mg). The mixture was stirred under hydrogen atmosphere at room temperature overnight. The resulting suspension was filtered through Celite, and the filtrate was concentrated in vacuo to afford the desired product.
• Step E (S )-l-tert-Butyl 3-methyl 5-oxopiperazine-l,3-dicarboxylate.
• Step F (S)-4-(tert-Butoxycarbonyl)-6-oxopiperazine-2-carboxylic acid
• MeOH MeOH
• THF 20 mL
• a solution ofLiOH * H 2 0 159 mg, 3.8 mmol
• H 2 0 10 mL
• EtOAc 25 mL
• Step A 2-Hydroxy-4-carboxyaIdehyde oxime.
• Step B 2-Bromopyrimidine-4-carbonitrile.
• a mixture of 2-hydroxy-4-carboxyaldehyde oxime (9 g, 28.8 mmol), tetrabutyl ammonium bromide ( 10 g, 71 .9 mmol) and phosphorus pentoxide (2 g, 14.4 mmol) in toluene (300 mL) was stirred at 120 °C for 2 h. The resulting mixture was filtered and the filtrate was concentrated. The resulting residue was purified by column
• n 1 ,2
• Compound 2 was prepared according to the following scheme, using the following protocol.
• Step A (S)-Methyl l-methyl-5-oxopyrrolidine-2-carboxylate.
• DMF 50 mL
• anhydrous K 2 C0 3 16 g, 1 16 mmol
• iodomethane 16.4 g, 1 16 mmol
• Step B (S)-l-Methyl-5-oxopyrrolidine-2-carboxylic acid.
• MeOH MeOH
• THF 2 mL
• H 2 0 2 mL
• NaOH 0.45 g, 1 1 .4 mmol
• Step C Compound2. 2-Chlorobenzaldehyde (1 17 mg, 0.83 mmol), 3-fluoroaniline (92.5 mg, 0.83 mmol), crude (S)-l-methyl-5-oxopyrrolidine-2-carboxylic acid (200 mg, -60% purity, 0.83 mmol) and l,l-difluoro-3-isocyanocyclobutane (119 mg, 90% purity, 1.0 mmol) were used in the UGI reaction to give the desired product (diastereomeric mixture). !
• Step A (S )-N-( l-( 2-Ch loroph enyl)-2-( ( 4,4-difluorocycloh exyl )amino)-2-oxoethyl )-N-( 3-fluoro -phenyl)-5-oxopyrmlidine-2-carboxamide.
• Compound 44 was prepared according to the following scheme, using the following protocol.
• Compound 9 was prepared according to the following scheme, using the following protocol.
• Step A (S)-2-Oxooxazolidine-4-carboxylic acid.
• (S)-2-(benzyloxycarbonylamino)-3-hydroxypropanoic acid 1 g, 4.2 mmol
• the mixture was extracted with EtOAc (4 x 10 mL). The combined organic layers were dried over anhydrous Na 2 S0 4 and concentrated in vacuo to give the desired product as a white solid.
• Step B (4S)-N-(l-(2-Chlorophenyl)-2-(3,3-difluorocyclobutylamino)-2-oxoethyl)-N-(3-fluoro - phenyl)-2 ⁇ oxooxazolidine-4-carboxamide.
• 2-Chlorobenzaldehyde 160 mg, 1 .14 mmol
• 3- fluoroaniline 127 mg, 1 .
• Step C (S)-N-((R)-l-(2-Chlorophenyl)-2-(3,3-difluorocyclobutylamino)-2-oxoethyl)-N-(3- - fluorophenyl )-2-oxo-3-(pyrimidin-2-yl )oxazolidine-4-carboxamide and(S )-N-( ( S )-l-(2-chloro ⁇ h yl)-2-(3,3-difluorocyclobutylamino)-2-oxoethyl)-N-(3-fluorophenyl)-2-oxo-3-(pyrimidin- 2-yl)oxazolidine-4-carboxamide.
• Step A (S)-6-Oxopiperidine-2-carboxylic acid.
• a solution of (S)-2-aminohexanedioic acid (470 mg, 2.9 mmol) in 20% AcOH (5 mL) was stirred at 1 10 °C overnight.
• the solvent was removed in vacuo and the residue was dissolved in EtOH ( 10 mL).
• the unreacted amino acid was precipitated and filtered off. The filtrate was concentrated to give the crude desired product which was used directly in the next step.
• MS: 142. 1 (M- l ) '
• Step B (S)-N-(l-(2-Chlorophenyl)-2-((3,3-difluorocyclobutyl)amino)-2-o ⁇
• Step C (S)-N-((S)-l-(2-Chlorophenyl)-2-((3,3-difluorocyclobutyl)amino)-2-oxo - fluowphenyl)-6-oxo-l-(pyrimidin-2-yl)piperidine-2-carboxamide and (S)-N-((R)-l-(2-chloro - phenyl)-2-((3,3-difluorocyclobutyl)aniino)-2-oxoethyl)-N-(3-fluorophenyl)-6-oxo-l- (pyrimidin-2-yl)piperidine-2-carboxamide
• a mixture consisting of ( l /?)-N-( l -(2-chlorophenyl) - 2-((3,3-difluorocyclobutyl)amino)-2-oxoethyl)-N-(3-fluoropheny
• Compound 30 waspr ⁇ ared according to the following scheme, using the following protocol.
• Step A (S)-3-Hydroxy-2-(4-methoxybenzylamino)propanoic acid.
• StepB (S)-Benzyl4-(4-methoxybenzyl)-5-oxornorpholine-3-carboxylate.
• Step C (S Benzyl 5-oxomorpholine-3-carboxylate.
• CAN eerie ammonium nitrate
• CAN eerie ammonium nitrate
• the resulting mixture was stirred at 0 °C for 1 h.
• DIP EA was added at 0 °C to adjust thepH to 6 ⁇ 7 and the mixture was concentrated in vacuo.
• the residue was purified by column chromatography to afford the desired product as a white solid M S: 236.1 (M+ l) + .
• StepD (S )-5-Oxomorpholine-3-carboxylic acid.
• MS 146.1 (M + l) + .
• Step E ( S )-N-( ( S )-!-( 2-Chlorophenyl )-2-( ( 3,3-difluorocyclobutyl )amino)-2-oxoethyl )-N-( 3 - fluorophenyl)-5-oxomorpholine-3-carboxamide.
• Step F Compound 30.
• a mixture of (5 -N-((5 -l-(2-chlorophenyl)-2-((3,3-difluoro - cyclobutyl)amino)-2-oxoethyl)-N-(3-fiuorophenyl)-5-oxomorpholine-3-carboxamide (100 mg, 0.2 mmol), 2-bromopyrimidine (36 mg, 022 mmol), Pd 2 (dba) 3 (28 mg, 0.03 mmol), XantPhos (16 mg, 0.03 mmol) and Cs 2 C0 3 (160 mg, 0.5 mmol) in 1,4-dioxane (4 mL) was stirred at 100 °C for 3.5 h under N 2 .
• Step A 5-Nitroisophthaloyl dichloride. To a solution of 5-nitroisophthalic acid (2.3 g, 1 1 mmol) in S0C1 2 (6 mL) was added a drop of DMF and the mixture was stirred at reflux for 3 hr. The resulting reaction mixture was concentrated to give the crude product which was used directly in the next step.
• Step B 5-Nitroisophthalamide.
• 5-Nitroisophthaloyl dichloride (2.7 g, 9.7 mmol) was added portionwise to a cold solution of NH 3 ' H 2 0 (40 mL) at 0 °C. The reaction mixture was stirred overnight and a white precipitate formed. The mixture was then filtered, washed with excess of water, and dried at 1 10 °C to give the crude product which was used directly in the next step.
• Step C 5-Aminoisophthalamide. To a solution of 5-nitroisophthalamide (2 g, 9.6 mmol) in MeOH (200 mL) was added Pd/C (200 mg). The reaction was stirred overnight under a hydrogen atmosphere. The suspension was filtered and the filtrate was concentrated to afford the desired product which was used directly in the next step.
• StepD 5-((2S)-N-(l-(2-Chlorophenyl)-2-((3,3-difluorocyclobutyl)amino)-2-oxoethyl)l-(4cyano pyridin-2-yl)-5-oxopyrrolidine-2-carboxamido)isophthaIamide.
• Step E (2S)-N-(l-(2-Chlorophenyl)-2-((3,3-difluorocyclobutyl)amino)-2-oxoet yl)l-(4-cyano pyridin-2-yl)-N-(3,5-dicyanophenyl)-5-oxopyrrolidine-2-carboxamide.
• Compound 97 was synthesized via the UGI reaction procedure set forth herein, using the appropriate aldehyde, amine, carboxylic acid, isocyanide and halo-substituted aromatic ring or heterocyclic (heteroaromatic) ring and purified via standard methods.
• DIPEA (0.055 mL, 0.34 mmol) was added to the mixture followed by Ac 2 0 (0.03 1 mL, 0.34 mmol) at 0°C. Then the mixture was stirred at room temperature for 2 hr. The solution was concentrated and the residue was purified by a standard method to afford the desired product.
• Step A - Oxazole-5-carboxamide.
• Ethyl oxazole-5-carboxylate (2 g, 14.2 mmol) was dissolved in NH 3 solution (7 M in MeOH, 25 mL). The solution was stirred at room temperature for 2 hr and filtered. The solid was dried to give the desired product ( 1 .5 g, 92% yield) as a white powder which was used directly in the next step.
• Step B 2-Iodooxazole-5-carboxamide.
• Oxazole-5-carboxamide (560 mg, 5.0 mmol) was dissolved in anhydrous THF (7.5 mL) and flushed with N 2 .
• the solution was cooled to -42 °C and treated with fresh LiHMDS ( 15 mL, 1 M in THF).
• the solution became dark yellow was stirred for 20 min and fol lowed by the addition of a solution of ZnCl 2 (30 mL, 0.5 M in THF).
• the reaction was warmed to 0 °C for 1 hr.
• Step C 2-((S)-2-(((S)-l-(2-Chlorophenyl)-2-((3,3-difluorocyclobutyl)a
• Step D ( S)-N-( ( S)-l-( 2-Chloroph enyl )-2-( ( 3,3-difluomcyclobutyl )amino)-2-oxoethyl )-!-( 5- cyanooxazol-2-yl)-N-(3,5-difluorophenyl)-5-oxopyrrolidine-2- rboxamide.
• Step A (2S,4R)-l-tert-Butyl 2-methyl 4-((tert-butyldimethylsilyl)oxy)pyrrolidine-l,2- dicarboxylate.
• Imidazole (2.8 g, 40.8 mmol) was added to a solution of (2S,4R)- l -tert-butyl 2- methyl 4-hydroxypyrrolidine- l ,2-dicarboxylate (5.0 g, 20.4 mmol) and TBSC1 (4.6 g, 30.6 mmol) in anhydrous DMF ( 100 mL). The mixture was stirred at room temperature overnight and then partitioned between EtOAc and H 2 0. The organic layer was separated, washed with aq.
• Step B (2S,4R)-l-tert-Butyl 2-methyl 4-((tert-butyldimethylsilyl)oxy)-5-oxopyrrolidine-l,2- dicarboxylate.
• NaI0 4 7.5 g, 35.0 mmol
• Ru0 2 370 mg, 2.8 mmol
• Step C ( 2S,4R )-4-(( tert-Butyl dimethyl ' silyl )oxy)-5-oxopyrrolidin e-2-carboxylic acid.
• TF A (6 mL) was added to a solution of (2S,4R)- l -tert-butyl 2-methyl 4-((tert-butyldimethylsilyl)oxy)-5- oxopyrrolidine- l ,2-dicarboxylate (2.5 g, 6.68 mmo l) in DCM (18 mL) at 0 °C.
• the mixture was stirred at room temperature for 1 hthen concentrated.
• the residue was dissolved in M eOH/THF (1 OmL/1 OmL) followed by addition of a solution of LiOH (842 mg, 20.1 mmol) in water (5 mL).
• Step D The same as general procedure for UGI reaction set forth herein.
• Step E The same as general procedure for Buchwald reaction set forth herein.
• Step F (2S,4R )-N-( l-(2-Chlorophenyl )-2-( ( 3,3-difluorocyclobutyl )amino)-2-oxoethyl )-N-(3- cyano-ph enyl )-!-( 4-cyan opyridin-2-yl )-4-hydroxy-5 -oxopyrrolidin e-2-carboxamide.
• Step A (2S)-1 -tert-Butyl 2-methyl 4-( tert-butyldimethylsilyloxy)-4-methyl-5-oxopyrrolidine- 1 ,2-dicarboxylate.
• LiHM DS (1 M in THF, 22.6 mL, 22.6 mmol) was added into a mixture of (2S,4R)-l -tert -butyl 2-methyl 4-(tert-butyldimethylsi ⁇ loxy)-5-oxopyrrolidine- l,2-dicar-boxylate (6.5 g, 17.4 mmol) in THF (60 mL) at -78°C under N 2 .
• the mixture was stirred at -78°C for 1 hr.
• Step B (2S,4S)-M ethyl 4-((tert-butyldimethylsilyl)oxy)-5-oxopyrrolidine-2-carboxylate.
• a solution of (2S)- l -tert-butyl 2-methyl 4-(tert-butyldimetbylsilyloxy)-4-methyl-5-oxopyrroli-dine- 1 ,2-dicarbo xylate (960 mg, 25 mmo l) in TFA/DQVI (V : V 1 : 3) was stirred at room temperature for 1 h. The mixture was then concentrated to give the desired product which was used directly in the next step .
• Step C (2S)-4-(tert-Butyldimethylsilyloxy)-4-methyl-5-oxopyrrolidin e-2-carboxylic acid.
• (2S)-methyl 4-(tert -bury ldimethylsiryloxy)-4-methyl-5-oxopyrrolidine-2-carbo-xy late 400 mg, 1.4 mmol
• LiOH 50 mg 2.1 mmol
• Step D (2S)-4-(tert-Butyldimeth ⁇ silyloxy)-N-(l-(2-chlorophenyl)-2-(3,3-difluorocyclobut- ylamino)-2-oxoethyl)-N-(3-fluorophenyl)-4-methyl-5-oxopyrrolidin e-2-carboxamide.
• Step E (2S)-4-(tert-Butyldimethylsilyloxy)-N-(l-(2-chlorophenyl)-2-(3,3-difluorocyclobutyl- amino)-2-oxoethyl)-l-(4-cyanopyridin-2-yl)-N-(3-fluorophenyl)-4-methyl-5-oxopyrrolidine-2- carboxamide.
• Step F ( 2S)-N-( (R)-l-( 2-Ch loroph enyl )-2-( 3,3-dflu orocyclobutyl amino )-2-oxoethyl)-l-( 4- cyanopyridin-2-yl )-N-( 3 -fluorophenyl )-4-hydroxy-4-methyl-5-oxopyrrolidine-2-carboxamide.

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