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  • C07D207/08—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 no double bonds between ring members or between ring members and non-ring members with hydrocarbon radicals, substituted by hetero atoms, attached to ring carbon atoms
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  • C07D207/10—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 no double bonds between ring members or between ring members and non-ring members 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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  • C07D211/08—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms
  • C07D211/18—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms with substituted hydrocarbon radicals attached to ring carbon atoms
  • C07D211/26—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members with hydrocarbon or substituted hydrocarbon radicals directly attached to ring carbon atoms with substituted hydrocarbon radicals attached to ring carbon atoms with hydrocarbon radicals, substituted by nitrogen atoms
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  • C07D211/06—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members
  • C07D211/36—Heterocyclic compounds containing hydrogenated pyridine rings, not condensed with other rings with only hydrogen or carbon atoms directly attached to the ring nitrogen atom having no double bonds between ring members or between ring members and non-ring members 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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  • C07D241/00—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings
  • C07D241/02—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings
  • C07D241/04—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings having no double bonds between ring members or between ring members and non-ring members
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  • C07D241/00—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings
  • C07D241/02—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings
  • C07D241/06—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings having one or two double bonds between ring members or between ring members and non-ring members
  • C07D241/08—Heterocyclic compounds containing 1,4-diazine or hydrogenated 1,4-diazine rings not condensed with other rings having one or two double bonds between ring members or between ring members and non-ring members with oxygen atoms directly attached to ring carbon atoms
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  • C07D401/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom
  • C07D401/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings
  • C07D401/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, at least one ring being a six-membered ring with only one nitrogen atom containing two hetero rings linked by a chain containing hetero atoms as chain links
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  • C07D403/00—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00
  • C07D403/02—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings
  • C07D403/12—Heterocyclic compounds containing two or more hetero rings, having nitrogen atoms as the only ring hetero atoms, not provided for by group C07D401/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
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  • C07D409/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having sulfur atoms as the only ring hetero atoms containing two hetero rings linked by a chain containing hetero atoms as chain links
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  • C07D417/12—Heterocyclic compounds containing two or more hetero rings, at least one ring having nitrogen and sulfur atoms as the only ring hetero atoms, not provided for by group C07D415/00 containing two hetero rings linked by a chain containing hetero atoms as chain links
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  • C07D471/02—Heterocyclic compounds containing nitrogen atoms as the only ring hetero atoms in the condensed system, at least one ring being a six-membered ring with one nitrogen atom, not provided for by groups C07D451/00 - C07D463/00 in which the condensed system contains two hetero rings
  • C07D471/08—Bridged systems

Definitions

• a ⁇ peptide is formed by the proteolytic cleavage of APP by ⁇ -secretase (BACE) followed by at least one subsequent C-terminal cleavage by ⁇ -secretase.
• BACE ⁇ -secretase
• inhibition of BACE is an attractive target for the treatment or prevention of Alzheimer's disease as well as other diseases characterized pathologically by amyloid plaques.
• BACE is a member of the pepsin sub-family of mammalian aspartyl proteases and, like its substrate APP, is a type I transmembrane protein.
• BACE has been disclosed in the literature and is referred to also as " ⁇ -site APP-cleaving enzyme", “membrane aspartic protease of the pepsin family", “Asp-2”, “ ⁇ -secretase”, “membrane-bound aspartic protease” and “Memapsin 2" (See: Ghosh, et al., Current Medicinal Chemistry. 9(11), 1135-1144 (2002)). Two isoforms of BACE have been identified in humans, designated BACE1 and BACE2.
• BACE1 inhibitory activity is most important to inhibition of amyloid ⁇ (A ⁇ ) peptide (Roggo, Current Topics in Medicinal Chemistry.2, 359-370 (2002)).
• a ⁇ amyloid ⁇
• BACE inhibitors are peptidomimetic transition state analogs, typically containing a hydroxyethyl moiety.
• R 1 is (C 3 -C 7 cycloalkyl)o. ⁇ (C ⁇ -C6 alkyl), (C 3 -C 7 cycloalkyl) 0-1 (C 2 -C 6 alkenyl), (C 3 - C 7 cycloalkyl)o- ⁇ (C 2 -C 6 alkynyl) or C 3 -C 7 cycloalkyl, each optionally substituted with up to three groups independently selected from halo, hydroxy, thiol, cyano, trifluoromethyl, trifluoromethoxy, -C ⁇ alkoxy, C 3 -C cycloalkoxy, oxo, and NR 9 R 10 , hydrogen,
• R 14 is C 3 -C 5 cycloalkyl, d- alkyl, or -CH 2 R 18 ;
• R 15 is -CF 2 R 19 , -OR 20 , -CH 2 C(O)CH 3 , -S(O) 1-2 R 21 , -NR 22 SO 2 R 23 , (Q-C 3 alkoxy)- carbonyl, phenyl optionally substituted with halo, l,3-dioxolan-2-yl, l,3-dioxan-2-yl, 1,1- dioxo-2,3,4,5-tetrahydroisothiazol-2-yl, or tetrazol-5-yl optionally substituted with C 1 -C 3 alkyl;
• R 16 is hydrogen, chloro, isobutyl, CH 2 R 24 ; CF 2 R 25 , l,l,l-trifluoro-2-hydroxyeth-2- yl, C 2 -C
• the present invention also provides a method for inhibiting ⁇ -secretase mediated cleavage of amyloid precursor protein comprising administering to a mammal in need of such treatment an effective amount of a compound of Formula I.
• the present invention further provides a method for the inhibition of production of A- ⁇ peptide comprisi g administering to a mammal in need of such treatment an effective amount of a compound of Formula I.
• the present invention also provides a pharmaceutical formulation comprising a compound of Formula I, in combination with a pharmaceutically acceptable carrier, diluent, or excipient.
• this invention provides the use of a compound of Formula I for the manufacture of a medicament for the treatment of Alzheimer's disease.
• This invention also provides the use of a compound of Formula I for the manufacture of a medicament for the prevention of the progression of mild cognitive impairment to Alzheimer' s disease.
• the invention also provides the use of a compound of Formula I for the manufacture of a medicament for the inhibition of BACE.
• the present invention also provides the use of a compound of Formula I for the manufacture of a medicament for the inhibition of ⁇ -secretase mediated cleavage of amyloid precursor protein.
• the invention further provides the use of a compound of Formula I for the manufacture of a medicament for the inhibition of production of A- ⁇ peptide.
• this invention provides a pharmaceutical formulation adapted for the treatment of Alzheimer's disease.
• this invention provides a pharmaceutical formulation adapted for the prevention of the progression of mild cognitive impairment to Alzheimer's disease.
• This invention also provides a pharmaceutical formulation adapted for the inhibition of BACE. Furthermore the present invention provides a pharmaceutical formulation adapted for the inhibition of ⁇ -secretase mediated cleavage of amyloid precursor protein. The present invention also provides a pharmaceutical formulation adapted for the treatment of conditions resulting from excessive production and/or reduced clearance of A- ⁇ peptide comprising a compound of Formula I or a pharmaceutically acceptable salt thereof in combination with one or more pharmaceutically acceptable excipients, carriers, or diluents. This invention also provides intermediates of Formula II:
• R is Ci-Cs alkyl, benzyl optionally monosubstituted in the phenyl ring with a substituent selected from the group consisting of halo, C C alkoxy optionally substituted in the alkyl chain with C 3 -C 7 cycloalkyl, and -C 6 alkylthio optionally substituted in the alkyl chain with C 3 -C 7 cycloalkyl, or benzyl optionally disubstituted in the phenyl ring with a first substituent independently selected from halo and a second substituent independently selected from halo, Ci-C ⁇ alkoxy optionally substituted in the alkyl chain • with C 3 -C 7 cycloalkyl, and Ci-C ⁇ alkylthio optionally substituted in the alkyl chain with C 3 -C cycloalkyl; R is hydrogen or Ci-C ⁇ alkyl; R 4 is hydrogen, C ⁇ -C 6 alkyl, or phenyl; R 3
• R 1 is (C 3 -C 7 cycloal yl)o- ⁇ (C ⁇ -C 6 alkyl), (C 3 -C 7 cycloalkyl) 0-1 (C 2 -C 6 alkenyl), (C 3 - C cycloalkyl) 0-1 (C 2 -C 6 alkynyl) or C 3 -C 7 cycloalkyl, each optionally substituted with up to three groups independently selected from halo, hydroxy, thiol, cyano, trifluoromethyl, trifluoromethoxy, C C ⁇ alkoxy, C 3 -C 7 cycloalkoxy, oxo, and NR 9 R 10 , hydrogen,
• X is CH, N, ⁇ rN + -O " ;
• Q is CR 17 , N, orN + -O " ;
• R 2 is C 1 -C 3 alkyl, benzyl optionally monosubstituted in the phenyl ring with a substituent selected from the group consisting of halo, C ⁇ -C 6 alkoxy optionally substituted in the alkyl chain with C 3 -C 7 cycloalkyl, and C C 6 alkylthio optionally substituted in the alkyl chain with C -C 7 cycloalkyl, or benzyl optionally disubstiruted in the phenyl ring with a first substituent independently selected from halo and a second substituent independently selected from halo, C ⁇ -C 6 alkoxy optionally substituted in the alkyl chain with C 3 -C cycloalkyl, and C C 6 alkylthio optionally substituted in the alkyl
• R 27 is C 1 -C 3 alkyl, C 3 -C 5 cycloalkyl, C 2 -C 3 alkenyl, C 1 -C 3 alkoxy, NR 28 R 29 , pyrrolidin-1-yl optionally substituted with methyl or one or two fluorine atoms, piperidin- 1-yl, phenyl, pyridinyl, or furyl;
• R 2 is hydrogen or methyl;
• R 29 is methyl, ethyl, or propyl;
• R 30 is hydrogen or methyl;
• R is methyl; or R and R taken together with the nitrogen atom to which they are attached form a pyrrolidine or piperidine ring; 39 •
• R is Ci-do alkyl optionally substituted with 1-6 fluorine atoms, oxo, or one or two hydroxy groups, C 2 -C 6 alkenyl, or -(CH 2 )o -3
• R 1 is (C 3 -C 7 cycloalkyl)o. ⁇ (C ⁇ -C 6 alkyl), (C 3 -C 7 cycloalkyl) 0-1 (C 2 -C 6 alkenyl), (C 3 - C 7 cycloalkyl) 0-1 (C 2 -C 6 alkynyl) or C 3 -C 7 cycloalkyl, each optionally substituted with up to three groups independently selected from halo, hydroxy, thiol, cyano, trifluoromethyl, trifluoromethoxy, C ⁇ -C 6 alkoxy, C 3 -C cycloalkoxy, oxo, and NR 9 R 10 , hydrogen,
• R 21 is hydrogen, chloro, isobutyl, CH 2 R 24 ; CF 2 R 25 , l,l,l-trifluoro-2-hydroxyeth-2- yl, C 2 -C alkenyl optionally substituted with one or two fluorine atoms, OR 26 , C(O)R 27 , N(methyl)(methylsulfonyl), N(methyl)(acetyl), pyrrolidin-2-on-l-yl, methylsulfony
• d-d alkyl includes methyl, ethyl, propyl, and isopropyl
• d-d alkyl and d-C 10 alkyl include methyl, ethyl, propyl, isopropyl, butyl, isobutyl, sec-butyl, tert-butyl, pentyl, neopentyl, and hexyl moieties.
• d-C 5 cycloalkyl includes cyclopropyl, cyclobutyl, and cyclopentyl moieties
• d-d cycloalkyl includes cyclopropyl, cyclobutyl, cyclopentyl, and cyclohexyl
• d-C 7 cycloalkyl includes cyclopropyl, cyclobutyl, cyclopentyl, cyclohexyl, and cycloheptyl moieties.
• C 2 -d alkenyl includes ethenyl, prop-l-en-3-yl, prop-l-en-2-yl, and the like.
• C 2 -d alkenyl and “C 2 -C 10 alkenyl” include ethenyl, prop-l-en-3- yl, prop-l-en-2-yl, 2-methylprop-l-en-l-yl, and the like.
• C 2 -C 6 alkynyl and “C 2 -C 10 alkynyl” include ethynyl, prop-l-yn-3-yl, prop-1-yn-l-yl, 4-methylpent-2-yn-l-yl, and the like.
• Halo includes fluoro, chloro, -bromo, and iodo.
• C1-C3 alkoxy and “d-C 6 alkoxy” are a C 1 -C 3 alkyl group or a d-C 6 alkyl group, respectively, bonded to an oxygen atom and include methoxy, ethoxy, isopropoxy, tert-butoxy, and the like.
• the terms "d-C 5 cycloalkoxy” and “C 3 - C 7 cycloalkoxy” are a C 3 -C 5 cycloalkyl group or a C 3 -C 7 cycloalkyl group, respectively, bonded through an oxygen atom and include cyclopropoxy, cyclobutoxy, cyclopentoxy, and the like.
• (C 3 -C 7 alkyl) is taken to mean a d-d alkyl moiety optionally substituted with one C 3 -C 7 cycloalkyl moiety at any available carbon atom in the d-C 6 alkyl moiety.
• d-C 6 alkoxy optionally substituted in the alkyl chain with C 3 -C alkyl is taken to mean a d-C 6 alkoxy moiety optionally substituted with one C 3 -C cycloalkyl moiety at any available carbon atom in the d-C 6 alkoxy moiety.
• d- C 6 alkylthio optionally substituted in the alkyl chain with C 3 -C 7 alkyl is taken to mean a d-C 6 alkylthio moiety optionally substituted with one C 3 -C 7 cycloalkyl moiety at any available carbon atom in the d-C 6 alkylthio moiety.
• nitrogen protecting group is taken to mean a moiety that is stable to projected reaction conditions and yet may be selectively removed by reagents and reaction conditions compatible with the regenerated amine.
• groups are well known by the skilled artisan and are described in the literature. (See, for example: Greene and Wuts, Protective Groups in Organic Synthesis, Third Edition, Chapter 7, John Wiley and Sons Inc., (1999)).
• Nitrogen protecting groups contemplated include: a) suitable carbamates, such as: 1) d- alkyl carbamates including methyl, ethyl, tert-butyl, tert-amyl, diisopropylmethyl carbamates, and the like; 2) substituted ethyl carbamates, such as 2,2,2-trichloroethyl, 2- trimethylsilylethyl, 2-phenylethyl, l,l-dimethyl-2-haloethyl, 1,1- dimethyl-2,2-dibromoethyl, l,l-dimethyl-2,2,2-trichloro-ethyl, 2- (pyridin-2-yl)ethyl, 2-(pyridin-4-yl)ethyl, 2-methylthioethyl, 2- methylsulfonylethyl, 2-(p-toluenesulfonyl)ethyl, 2-phosphonioethyl
• Benzyl carbamates such as benzyl, 4-methoxybenzyl, 4-nitrobenzyl, 4-halobenzyl, 4-cyanobenzyl, 4-decyloxybenzyl, 2,4-dichlorobenzyl, 3,5-dimethoxybenzyl, 2-nitrobenzyl, 3,4-dimethoxy-6-nitrobenzyl, phenyl (2-nitrophenyl)methyl, 4-methylsulfinylbenzyl, 9- anthrylmethyl, diphenylmethyl, 3-chloro-4-(C 2 -C 6 acyloxy)benzyl, 4- (dihydroxyboryl)benzyl carbamates, and the like; 12) 2-(l,3-dithianyl)methyl carbamate; 13) aryl carbamates, such as phenyl, nicotinyl, 4-(methylthio)phenyl, 2,4- di(methylthio)phenyl, 3-nitrophenyl carbamates, and the like;
• oxygen protecting group is taken to mean a moiety that is stable to projected reaction conditions and yet may be selectively removed by reagents and reaction conditions compatible with the regenerated alcohol.
• groups are well known by the skilled artisan and are described in the literature. (See, for example: Greene and Wuts, Protective Groups in Organic Synthesis, Third Edition, Chapter 7, John Wiley and Sons Inc., (1999)).
• tert-butyldiphenylsilyl tribenzylsilyl, tri-p-xylylsilyl, triphenylsilyl, diphenyl- methylsilyl, di-tert-butylmethylsilyl.
• the term "inhibition of production of A- ⁇ peptide” is taken to mean decreasing of excessive in vivo levels of A- ⁇ peptide in a mammal to normal or sub-normal levels.
• the term "effective amount of a compound of Formula I” is taken to mean the dose or doses of a compound of Formula I required to inhibit BACE sufficiently to decrease in vivo levels of A- ⁇ peptide in a mammal to normal or sub-normal levels.
• treatment includes treating one or more disease symptoms present in a patient as well as slowing, arresting, or reversing the progression of the disease.
• BACE includes both BACE1 and BACE2.
• Mild cognitive impairment has been defined as a potential prodromal phase of dementia associated with Alzheimer's disease based on clinical presentation and on progression of patients exhibiting mild cognitive impairment to Alzheimer's dementia over time. (Morris, et al., Arch. Neurol.. 58, 397-405 (2001); Petersen, et al, Arch. Neurol., 56, 303-308 (1999)).
• the term "prevention of the progression of mild cognitive impairment to Alzheimer's disease” includes slowing, arresting, or reversing the progression of mild cognitive impairment to Alzheimer' s disease in a patient.
• compounds of Formulae I, II, and III are comprised of a l-amino-2-hydroxyethyl core that contains two chiral centers:
• the single enantiomers or diastereomers may be isolated from mixtures by standard chiral chromatographic or crystallization techniques at any convenient point in the synthesis of compounds of the invention.
• Single enantiomers and diastereomers of compounds of the invention are a preferred embodiment of the invention. It will be understood by the skilled reader that some or all of the compounds of
• Formulae I, II, III, and IV are capable of forming salts.
• the acid addition or pharmaceutically acceptable salts of all of the compounds are included in the names of them.
• the compounds of the present invention are amines, and accordingly react with any of a number of inorganic and organic acids to form pharmaceutically acceptable acid addition salts.
• Preferred pharmaceutically acceptable salts are those formed with hydrochloric acid and trifluoroacetic acid.
• R 1 is hydrogen; b) R 1 is d-d alkyl; c) R 1 is d-C 4 alkyl; d) R 1 is d-C 2 alkyl; e) R 1 is methyl optionally substituted with chloro or fluoro; f) R 1 is methyl;
• R is benzyl optionally mono- or difluorinated in the phenyl ring; i) R 2 is benzyl; j) R 2 is 3-fluorobenzyl; k) R is 3,5-difluorobenzyl; 1) The compound of Formula I is a free base; m) The compound of Formula I is a pharmaceutically acceptable salt; n) The compound of Formula I is the hydrochloride salt. Preferred embodiments of the invention include all combinations of paragraphs a)-n).
• R 1 is (d-C 7 cycloalkyFjo- ⁇ d- C 6 alkyl), (d-C 7 cycloalkyl) 0-1 (C 2 -C 6 alkenyl), (C 3 -C 7 cycloalkyl) 0 - 1 (C 2 -C 6 alkynyl) or d-C 7 cycloalkyl, each optionally substituted with up to three groups independently selected from halo, hydroxy, thiol, cyano, trifluoromethyl, trifluoromethoxy, d-C alkoxy, C 3 -C 7 cycloalkoxy, oxo, and NR 4 R 5 , biphenyl optionally substituted with halo,
• Especially preferred compounds of Formula I are those where R 1 is C ⁇ -C 6 alkyl and R 2 is benzyl, 3-fluorobenzyl, or 3,5-difluorobenzyl. Most preferred compounds of Formula I are those where R 1 is methyl and R 2 is benzyl, 3- fluorobenzyl, or 3,5-difluorobenzyl.
• a preferred subgenus of compounds of Formula I are compounds of Formula 1(a):
• R 1 , R 2 , and R 6 are as previously defined.
• Other preferred compounds of Formula 1(a) are those where R 1 is (C 3 -C 7 cycloalkyl)o- ⁇ (C ⁇ -C6 alkyl), (C 3 -C 7 cycloalkyl) 0 - 1 (C 2 -C6 alkenyl), (C 3 -C 7 cycloalkyl) 0-1 (C 2 - C 6 alkynyl) or C 3 -C 7 cycloalkyl, each optionally substituted with up to three groups independently selected from halo,.
• R 2 is benzyl optionally mono- or difluorinated in the phenyl ring; p) R is benzyl; q) R is 3-fluorobenzyl; r) R is 3,5-difluorobenzyl; s) R >39 is a carbamate protecting group; t) R >39 is tert-butoxycarbonyl; u) R >39 is ⁇ -methylbenzyl; v) R >4 w 0 is benzyl; w) R ,40 is 2-methylbenzyl; x) R ,40 is hydrogen; y) R ,40 is hydrogen and R ,39 is tert-butoxycarbonyl or ⁇ -methylbenzyl; z) R 40 is hydrogen and R 39 is tert-butoxycarbonyl; aa) The compound of Formula II is a free base; bb
• Preferred embodiments of compounds of Formula II include all combinations of paragraphs o) - bb). Although all of the compounds of Formula III are useful intermediates for the preparation of BACE inhibitors, certain of the compounds are preferred: cc) R 1 is hydrogen; dd)R* is d-d alkyl; ee) R 1 is d-C 4 alkyl; ff) R 1 is d-d alkyl; gg) R 1 is methyl optionally substituted with chloro or fluoro; hh) R 1 is methyl;
• R is benzyl optionally mono- or difluorinated in the phenyl ring; kk) R 2 is benzyl; 11) R 2 is 3-fluorobenzyl; mm) R is 3,5-difluorobenzyl; nn) R is a carbamate protecting group; oo) R is tert-butoxycarbonyl; pp) R ,39 is benzyl; qq) R 39 is ⁇ -methylbenzyl; rr) R ° is hydrogen; ss)
• the compound of Formula III is a free base; tt)
• Especially preferred compounds of Formula III are those where R 1 is d-d alkyl, R 2 is benzyl, 3-fluorobenzyl, or 3,5-difluorobenzyl, R 40 is hydrogen and R 39 is tert-butoxycarbonyl or ⁇ -methylbenzyl.
• Most preferred compounds of Formula III are those where R 1 is methyl, R 2 is benzyl, 3-fluorobenzyl, or 3,5-difluorobenzyl, R 40 is hydrogen and R 39 is tert-butoxycarbonyl or ⁇ -methylbenzyl.
• R 1 is d-d alkyl; ww) R 1 is d-d alkyl; xx)R is d-d alkyl; yy) R 1 is methyl optionally substituted with chloro or fluoro; zz) R 1 is methyl;
• R 2 is benzyl optionally mono- or difluorinated in the phenyl ring; ccc) R is benzyl; ddd) R is 3-fluorobenzyl; eee) R 2 is 3,5-difluorobenzyl; fff) R 41 and R 42 are both methyl; ggg) R is tert-butoxycarbonyl; hhh) R 39 is benzyl; iii) R >39 is ⁇ -methylbenzyl; jjj)
• the compound of Formula TV is a free base; kkk)
• the compound of Formula IV is an acid addition salt.
• Preferred embodiments of compounds of Formula TV include all combinations of paragraphs uu) - kkk).
• the present invention also provides a method of inhibiting BACE in a mammal that comprises administering to a mammal in need of said treatment a BACE-inhibiting amount of a compound of Formula I. It is preferred that the mammal to be treated by the administration of the compounds of Formula I is human.
• the compounds of the present invention are useful for suppressing the production of A- ⁇ peptide, and therefore for the treatment of disorders resulting from excessive A- ⁇ peptide levels due to over-production and/or reduced clearance of A- ⁇ peptide.
• a further embodiment of the present invention is the use of a compound of Formula I for the manufacture of a medicament for treating a disease or condition capable of being improved or prevented by inhibition of BACE.
• the compounds of Formula I are therefore believed to be useful in treating or preventing Alzheimer's disease, mild cognitive impairment, Down's Syndrome, Hereditary Cerebral Hemorrhage with Amyloidosis of the Dutch-Type, cerebral amyloid angiopathy, other degenerative dementias such as: dementias of mixed vascular and degenerative origin, dementia associated with Parkinson's disease, dementia associated with progressive supranuclear palsy, dementia associated cortical basal degeneration, and diffuse Lewy body type of Alzheimer's disease.
• the compounds of the present invention may be prepared by a variety of procedures, some of which are illustrated in the Schemes below. It will be recognized by one of skill in the art that the individual steps in the following schemes may be varied to provide the compounds of Formula I.
• the amine of Formula II is reacted under standard amide forming conditions well known to the skilled artisan to provide compounds of Formula III (for example, see WO 03/040096 and WO 04/024081).
• An appropriate carboxylic acid of Formula R ! -COOH or an equivalent thereof, such as the sodium or, preferably, potassium carboxylate salt is reacted with a peptide coupling agent such as dicyclohexylcarbodiimide (DCC), l-(3- dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (EDCI), or n-propylphos- phonic anhydride, and an appropriate amine such as N-methylmorpholine or triethylamine, in a suitable solvent such as dichloromethane, dimethylformamide (DMF) or tetrahydrofuran (THF) to provide the compound of Formula III.
• a suitable solvent such as dichloromethane, dimethylformamide (DMF) or
• an additive such as 4-(dimethylamino)pyridine and/or 1-hydroxybenzotriazole or equivalents thereof may be added to the reaction mixture to facilitate the reaction.
• carboxylic acid equivalents including acylating agents, such as an appropriate acylimidazole, or a mixed anhydride, such as formic acetic anhydride, or an appropriate acid halide may be reacted directly with the amine of Formula II to provide the desired amide.
• acylating agents such as an appropriate acylimidazole
• a mixed anhydride such as formic acetic anhydride
• an appropriate acid halide may be reacted directly with the amine of Formula II to provide the desired amide.
• the requisite carboxylic acids, carboxylic acid salts, acylating agents, and mixed anhydrides are either commercially available or may be prepared from commercially available materials by methods well known to the skilled artisan.
• R 39 and R 40 may both be removed in a single reaction, for example by treatment with acid or under hydrogenation conditions, or may be removed sequentially as necessary or desired.
• R 40 is hydrogen
• only nitrogen deprotection is necessary to provide compounds of Formula I.
• R 39 and R 40 are both hydrogen
• no deprotection step is necessary.
• salts of compounds of the invention are desired, an appropriate free base of Formula I is simply reacted with an appropriate pharmaceutically acceptable acid in a suitable solvent under standard conditions to provide a pharmaceutically acceptable salt of a compound of Formula I.
• N,N-diprotected aminoaldehyde (iii) is reacted with the anion of appropriately substituted cyclic amine (iv) at low temperature in a suitable solvent, for example tetrahydrofuran, to provide the N,N-diprotected aminoethanol (v).
• a suitable solvent for example tetrahydrofuran
• the amine moiety is deprotected under standard conditions (For example, see: Greene and Wuts, Protective Groups in Organic Synthesis, Third Edition, Chapter 7, John Wiley and Sons Inc., (1999)) to provide the desired aminoethanol 11(a).
• aldehyde (vi) is reacted with the anion of an appropriately substituted nitroalkane (vii) to provide the corresponding nitroethane (viii).
• the nitroethane is reduced to provide the desired aminoethanol 11(a).
• the requisite anions are prepared by treating the appropriately substituted pyrrolidine or appropriately substituted nitroethane with a suitable base at low temperature.
• the requisite appropriately substituted pyrrolidines, appropriately substituted nitroethanes, and appropriately substituted aldehydes are either commercially available or may be prepared from commercially available starting materials.
• variable R 2 , R 3 , R 4 , R 5 , R 6 , R 7 , R 8 , R 39 , and R 39' are as previously defined and variable R 40 is an oxygen protecting group.
• 4-(S)-Isopropyloxazolidin-2-one (ix) is deprotonated with a suitable base, such as n-butyllithium in tetrahydrofuran, and then acylated with an appropriately substituted carboxylic acid derivative, such as an acid halide or acid anhydride, to provide the substituted acetamide (x).
• a suitable base such as N,N-diisopropylethylamine and reacted with aldehyde (vi) to provide the corresponding alcohol (xi).
• This alcohol is protected with an oxygen protecting group, preferably tert-butyldimethylsilyl, to provide the oxazolidin-2-one intermediate (xii).
• This intermediate is then reacted with basic hydrogen peroxide followed by treatment with a source of azide, such as diphenylphosphoryl azide, to provide the azidocarbonyl intermediate (xiii).
• a source of azide such as diphenylphosphoryl azide
• Treatment of the azidocarbonyl with benzyl alcohol followed by catalytic hydrogenation provides the desired amine (Ha).
• Additional ntermediates useful for the preparation of compounds of Formula I may be prepared as illustrated in the following scheme where R , R , R , R , and R 4'2 are as previously defined.
• This ketone may now be reacted under a variety of conditions well known to the skilled artisan to introduce the desired substituents at the 4-position of the pyrrolidine ring.
• the ketone may be reacted under Wittig-type conditions to provide alkenes that may be reduced under standard catalytic hydrogenation conditions to provide the corresponding alkyl moieties (See: Journal of Organic Chemistry, 68(10), 3923-3931 (2003)).
• the ketone may also be reacted with a variety of amines under standard reductive animation conditions to provide the desired amine functionality. Additionally, the ketone may be reacted under a variety of Grignard conditions to introduce alkyl and aryl moieties. The resulting teriary alcohols may be further substituted or reduced under standard conditions. These advanced derivatives are then deprotected under standard conditions to provide the compounds of Formula I.
• the intermediates of formulae (xiv), (xv), and (xvi) represent further embodiments of the present invention. Additional intermediates useful for the preparation of additional compounds of Formula I may be prepared as illustrated in the following scheme where R 3 , R 4 , R 5 , R 6 , and R are as previously defined.
• An appropriately substituted ester of 2-pyrrolidone-5 -carboxylic acid (xvii) may be treated with a suitable base, such as potassium hexamethyldisilazane, and the resulting anion reacted with an appropriate electrophilic agent, such as an alkyl halide, to provide either a mono- (xxi) or disubstituted (xviii) derivative.
• a suitable base such as potassium hexamethyldisilazane
• an appropriate electrophilic agent such as an alkyl halide
• different substituents may be introduced to the carbon adjacent to the carbonyl by sequentially forming an anion and quenching with different electrophilic agents as exemplified by the fluorinated derivative (xxvi).
• lactam in each of these derivatives is then reduced under standard conditions, the ester reduced to the corresponding alcohol, and this alcohol oxidized to provide the desired aldehydes (xx), (xxiii) and (xxviii). Additionally, instead of being reduced, the lactam carbonyl may be reacted with a variety of reagents to provide substitution at the 5-position of the pyrrolidine ring (xiv). Transformation of the ester into the corresponding aldehyde through a reduction/oxidation sequence provides additional aldehydes (xxv). These aldehydes may then be reacted as previously described in Schemes I and II to provide additional compounds of Formula I.
• the compound of Preparation 5 may be prepared essentially as described in Preparation 4 except 4-(R)-hydroxypyrrolidine-Nl,2-(R)-dicarboxylic acid 1 -tert-butyl ester 2-methyl ester is oxidized to the ketone and then converted to the geminal difluoride.
• the compound of Preparation 6 may be prepared essentially as described in Preparation 4 using nitroethane.
• (2R,4R)-2-r(lS.2SV2-Amino-3-(3.5-difluoro ⁇ henyl -l-hvdroxypropyn-4-(3-metho ⁇ y- phenoxy -pyrrolidine-l -carboxylic acid tert-butyl ester Add to a solution of (2R,4R)-2-[(lR,2S)-3-(3,5-difluorophenyl)-l-hydroxy-2- nitropropyl]-4-(3-methoxy-phenoxy)-pyrrolidine-l -carboxylic acid tert-butyl ester (276 mg, 0.54 mmol) in methanol (9 mL) nickel (II) chloride followed by sodium borohydride (0.082 g, 2.17 mmol).
• 2,2-Dimethylpyrrolidine-l -carboxylic acid tert-butyl ester Charge a two-neck flask provided with a reflux condenser with lithium aluminum hydride (1 M solution in THF, 32 mL, 32 mmol) under an argon atmosphere and heat at 60 °C.
• Li aluminum hydride 1 M solution in THF, 32 mL, 32 mmol
• (2R,4R -4-Benzyloxy-2-formylpyrrolidine-l -carboxylic acid tert-butyl ester Add triethylamine (1.1 mL, 7.79 mmol) and sulfurtrioxide-pyridine complex (0.63 g, 3.89 mmol) to an ice cold solution of (2R,4R)-4-benzyloxy-2-hydroxymethyl- pyrrolidine-1 -carboxylic acid tert-butyl ester (0.6 g, 1.95 mmol) in dimethyl sulfoxide (2 mL). Stir 30 minutes, warm to room temperature and stir 30 minutes.
• 2-Chloro-6-formyl-isonicotinic acid methyl ester Dissolve 2-chloro-6-vinyl-isonicotinic acid methyl ester (1.6 g, 8 mmol) in dichloromethane (10 mL) and flush the reaction vessel with oxygen gas. Cool to -78 °C and pass positive pressure of ozone through the solution for 15 min until blue color appears. Quench with excess dimethylsulfi.de (1.5 mL) and warm to room temperature overnight. Concentrate and purify (silica gel chromatography, eluting with 0: 100 to 10:90 ethyl acetate :hexanes) to give the title compound.
• the compound of Preparation 32 may be prepared essentially as described in Preparation 31.
• 2-Chloro-6-formyl-isonicotinic acid methyl ester Dissolve 2-chloro-6-vinyl-isonicotinic acid methyl ester (1.6 g, 8 mmol) in dichloromethane (10 mL) and flush the reaction vessel with oxygen gas. Cool to —78 °C and pass positive pressure of ozone through the solution for 15 min until sky blue color appears. At the same temperature quench the reaction with excess dimethylsulfide (1.5 mL) and warm up to room temperature overnight. Concentrate and purify (silica gel chromatography, eluting with 0:100 to 10:90 ethyl acetate:hexanes) to give the title compound.
• 2-Chloro-6-(2-oxopropyl)-isonicotinic acid methyl ester Add methyl 2,6-dichloroisonicotinate (3.0 g, 15.0 mmol), frans-dichlorobis(tri-o- tolylphosphine)palladium (II) (196 mg, 0.25 mmol), tributyltin methoxide (2.4 g, 7.5 mmol) and toluene (20 mL) in a previously nitrogen filled sealed vessel. Flush the reactants with nitrogen again. Add isopropenyl acetate (0.85 mL, 7.75 mmol) under nitrogen and heat the sealed mixture at ' l 00 °C overnight with vigorous stirring.
• 2-Chloro-6-(l-ethoxyvinyl -isonicotinic acid methyl ester Add methyl 2,6-dichloroisonicotinate (2.06 g, 10 mmol), tetrakis(triphenylphos ⁇ hine)palladium (0) (578 mg, 0.5 mmol), friphenyhlphosphine (263 mg, 1 mmol) and toluene (25 mL) in a previously nitrogen filled sealed vessel. Flush the reactants with nitrogen again. Add tributyl(l-ethoxyvinyl)tin (4.05 mL, 12.0 mmol) under nitrogen and heat the sealed mixture at 100 °C overnight with vigorous stirring.
• 6-Methoxypyridine-2,4-dicarboxylic acid 2-ethyl ester 4-methyl ester Add 2-chloro-6-methoxy-isonicotinic acid methyl ester (5 g, 24.8 mmol), palladium acetate (4.157 g, 18.5 mmol), l,4-bis(diphenylphosphino)butane (1.038 g, 2.43 mmol), ethanol (127 mL), triethylamine (18 mL, 129 mmol) with DMSO (150 mL) to a pressure vessel. Seal the pressure vessel and purge with nitrogen.
• 2-Chloro-6-isopropylsulfonyl-isonicotinic acid methyl ester Add sodium isopropylthiolate (0.89g, 10.0 mmol, (prepared from treatment of isopropanethiol with 0.95 equivalent of sodium hydride) slowly to a solution of methyl 2,6-dichloroisonicotinate (2.06g, 10.0 mmol) in DMF (10 mL) at 0 °C. Stir the mixture at room temperature overnight. Partition the mixture between diethyl ether (30 mL) and water (30 mL) and extract the aqueous layer with diethyl ether (2 x 30 mL). Wash the combined exfracts with 5%> aqueous lithium hydroxide solution, dry (magnesium sulfate) and concenfrate. The crude material is used directly in the next step reaction without further purification.
• 2-Chloro-6-isopropanesulfonyl-isonicotinic acid methyl ester Add 3-chloroperbenzoic acid (5.32 g, 30.8 mmol) to a solution of 2-chloro-6- isopropylsulfanyl-isonicotinic acid methyl ester (2.37g, 9.63 mmol) in dichloromethane (50 mL) at 0 °C. Stir the mixture at room temperature for 4 h and partition the mixture between dichloromethane and aqueous saturated sodium bicarbonate.
• the compounds of Preparation 43-44 may be prepared essentially as described in Preparation 42.
• the compounds of Preparation 46-48 may be prepared essentially as described in Preparation 45.
• [1.2]thiazinane 1. 1 -dioxide, sodium salt Add sodium (0.157 g, 6.84 mmol) to 50 mL of degassed anhydrous ethanol. After dissolution of sodium, add 4-chlorobutanesulfonamide (1.18 g, 6.84 mmol) into the solution and reflux for 2 h. Cool and filter through a filtering agent, concentrate the filtrate and add ethyl acetate. Filter the mixture through a pad of silica gel and wash with ethyl acetate. Concentrate the filfrate and dry. Convert [l,2]thiazinane 1, 1 -dioxide to the title compound by treatment with 0.95 equivalent of sodium hydride in THF, concentrate and dry.
• the compounds of Preparation 55-56 may be prepared essentially as described in Preparation 54.
• 6-chloropyridine-2,4-dicarboxylic acid 2-ethyl ester 4-methyl ester (0.500 g, 2.05 mmol), palladium acetate (0.0461g, 0.205 mmol), racemic 2,2'- bis(diphenylphosphino)-l,l'-binaphthyl (0.128 g, 0.205 mmol), cesium carbonate (0.801 g, 2.46 mmol) and toluene (5 mL), to a sealed vessel flushed with nitrogen.
• 2-Chloro-6-(methanesulfonyl-methylamino -isonicotinic acid methyl ester Add sodium hydride (257 mg, 6.43 mmol, 60% dispersion in mineral oil) at 0 ° C to a solution of 2-chloro-6-methanesulfonylamino-isonicotinic acid methyl ester (1.31 g, 4.95 mmol) in DMF (10 mL). After stirring at 0 ° C for 15 min, add iodomethane (0.4 mL, 6.43 mmol). Stir the reaction at 0° C for 1 h and at room temperature for 2 h. Quench the reaction with ice and extract the reaction mixture with ethyl acetate.
• 2-Chloro-6-methoxy-isonicotinic acid ethyl ester Treat an ethanol suspension of 2-chloro-6-methoxy-isonicotinic acid (3.75 g, 20 mmol) at 0 °C with thionyl chloride for 30 min. Heat at 70 °C overnight. Cool to room temperature, concentrate, dissolve the residue in ethyl acetate (200 mL), wash the organic layer with saturated aqueous sodium bicarbonate solution, saturated aqueous sodium chloride solution, dry (magnesium sulfate) and concenfrate to give the title compound (4.2 g, 98%).
• 2-Methanesulfonyl-6-(methylpropylamino)-isonicotinic acid methyl ester Add methylpropylamine (0.21 mL, 2.0 mmol) to a suspension of 2-chloro-6- methanesulfonyl-isonicotinic acid methyl ester (0.25 g, 1.0 mmol), palladium acetate (0.022 g, O.lmmol), racemic 2,2'-bis(diphenylphosphino)-l,l'-bmaphthyl (0.062 g, 0.1 mmol), and cesium carbonate (0.325 g, 1.0 mmol) in toluene (5 mL) at room temperature and stir 18 h at 80 °C. Cool, filter tlirough a filtering agent and purify (silica gel chromatography, eluting with 20:80 to 40:60 ethyl acetate:hexanes) to give the title compound (0.181
• 2-benzenesulfonyl-6-chloro-isonicotinic acid methyl ester Mix 2,6-dichloro-isonicotinic acid methyl ester (1 g, 4.85 mmol) and sodium thiophenoxide (0.64 g, 4.85 mmol) in DMF (10 mL) at room temperature for 4 h. Quench with water and extract with dichloromethane. Dry the dichloromethane layer over magnesium sulfate and concentrate. Dissolve the residue in chloroform (30 mL) and add neutral alumina (6 g) and potassium peroxymonosulfate (11.92 g, 19.39 mmol).
• 2-Benzyloxy-6-sec-butylamino-isonicotinic acid methyl ester Degas a sealed tube for 5 min and add a suspension 2-benzyloxy-6-chloro- isonicotinic acid methyl ester (1 g, 3.604 mmol), palladium acetate (100 mg, 0.445 mmol), racemic 2,2'-bis-diphenylphosphanyl-[l, ]binaphthalenyl (307 mg, 0.493 mmol), cesium carbonate (1.2 g, 3.683 mmol) and (R)-sec-butylamine (0.5 mL, 1.387 mmol) in toluene (14 mL). Heat to 105 °C and stir for 20 h. Cool to room temperature, concentrate and purify (silica gel chromatography, eluting with 3:97 ethyl acetate :hexanes) to give the title compound.
• 3-Cyano-4-fluoro-N,N-dipropylbenzamide Combine 3-bromo-4-fluoro-N,N-dipropylbenzamide (1.0 g, 3.3 mmol) with copper cyanide (0.45 g, 5.0 mmol) in DMF (5 mL) and heat at reflux until all starting material is consumed. Cool to room temperature and partition between ethyl acetate and saturated aqueous sodium bicarbonate.
• 3-Ethylcarbamoyl-5-(methyl-propylcarbamoyl)-benzoic acid stir a solution of 3-ethylcarbamoyl-5-(methyl-propylcarbamoyl)-benzoic acid ethyl ester (157 mg, 0.5 mmol), 1 N aqueous litliium hydroxide (2.45 mL, 2.45 mmol) and THF (2.45 mL) at room temperature overnight. Dilute the reaction with water and extract with dichloromethane.
• 5-Bromo-N-methyl-N-propyl-isophthalamic acid methyl ester Add N-methylpropylamine (5.14 g, 70.4 mmol) to a mixture of 5-bromo- isophthalic acid monomethyl ester and 5-bromo-isophthalic acid (18.2 g), 1- hydroxybenzotriazole (9.5 g, 70.4 mmol), and l-(3-dimethylaminopropyl)-3- ethylcarbodiimide hydrochloride (13.5 g, 70.4 mmol) in dichloromethane (200 mL). Stir the solution for 2 h at room temperature.
• N-Methyl-N-propyl-5-vinyl-isophthalamic acid methyl ester Dissolve 5-bromo-N-methyl-N-propyl-isophthalamic acid methyl ester (2.7 g, 8.6 mmol) in toluene (16 mL) and place the solution under nitrogen. Add in sequence 2,6-di- tert-butyl-4-methylphenol (a few crystals), tetrakis(triphenylphosphine)palladium (0) (185 mg, 0.16 mmol), and tributylvinyl tin (3 g, 9.5 mmol) and reflux for 4 h. Filter though a filtering agent and concenfrate.
• N-Methyl-5-oxazol-2-yl-N-propyl-isophthalamic acid methyl ester Add n-butyllithium (1.6 M in hexanes, 1.25 mL, 2.01 mmol) dropwise to a solution of oxazole (126 mg, 1.83 mmol) in THF (12.6 mL) at -78 °C. Stir for 30 min at -78 °C and add a solution of zinc chloride (747 mg, 5.49 mmol) in diethyl ether (5.5 mL) and stir at 0 °C for 1 h.
• N-Methyl-5-oxazol-2-yl-N-propyl-isophthalamic acid stir a solution of N-methyl-5-oxazol-2-yl-N-propyl-isophthalamic acid methyl ester (225 mg, 0.74 mmol) in 1 N lithium hydroxide (3.0 mL, 3.0 mmol) and THF (3.0 mL) at room temperature for 3 h. Add water (40 mL) and extract with ethyl acetate (40 mL).
• N-Methyl-5 -(3 -methyl- [ 1 ,2.4] oxadiazol-5 -yl VN-propyl-isophthalamic acid Stir a solution of N-methyl-5-(3-methyl-[l,2,4]oxadiazol-5-yl)-N-propyl- isophthalamic acid ethyl ester (135 mg, 0.4 mmol), 1 N lithium hydroxide (1.6 mL, 1.6 mmol) and THF (1.6 mL) at room temperature overnight. Add 1 N HCI (20 mL) and extract with ethyl acetate (3 x 20 mL). Dry (magnesium sulfate) and concenfrate to give the title compound.
• N-Methyl-5 -oxazol-5 -yl-N-propyl-isophthalamic acid N-Methyl-5-oxazol-5-yl-N-propyl-isophthalamic acid
• N-Methyl-5-oxazol-5-yl-N-propyl-isophthalamic acid Heat a solution of 5-formyl-N-methyl-N-propyl-isophthalamic acid ethyl ester (300 mg, 1.08 mmol), tosylmethyl isocyanide (254 mg, 1.3 mmol), and sodium methoxide (193 mg, 3.57 mmol) in methanol (3.1 mL) at 40 °C for 1 h. Add water to the hot solution and extract with dichloromethane and ethyl acetate.
• 5-(2,2-Difluorovinyl -N-methyl-N-propyl-isophthalamic acid stir a solution of 5-(2,2-difluorovinyl)-N-methyl-N-propyl-isophthalamic acid ethyl ester (187 mg, 0.63 mmol), 1 N lithium hydroxide (2.5 mL, 2.5 mmol) and THF (2.5 mL) at room temperature overnight. Partition the reaction between ethyl acetate and water. Acidify the aqueous with 5 N HCI and extract with ethyl acetate. Dry
• N-Methyl-5 -(2-methylpyrrolidine- 1 -carbonyl -N-propyl-isophthalamic acid stir a solution of N-methyl-5-(2-methylpyrrolidine-l-carbonyl)-N-propyl- isophthalamic acid ethyl ester (218 mg, 0.6 mmol), 1 N lithium hydroxide (2.4 mL, 2.4 mmol) and THF (2.4 mL) at room temperature overnight.
• MS (ES): m/z 333 [M+H].
• N-Methyl-5 -propoxy-N-propyl-isophthalamic acid Mix 5-propoxy-isophthalic acid monomethyl ester (500 mg, 2.10 mmol), l-(3- dimethylamino-propyl)-3-ethylcarbodiimide hydrochloride (403 mg, 2.10 mmol) and 1- hydroxybenzotriazole (283 mg, 2.10 mmol) in DMF (15 mL) at room temperature 1 h. Add methyl-propylamine (438 mg, 6.0 mmol) and stir at room temperature 16 h.
• 5-Methanesulfonyl-isophthalic acid dimethyl ester Dissolve sodium sulfite (1.7 g, 13.51 mmol) and sodium bicarbonate (1.2 g, 14.19 mmol) in water (10 mL). Add 5-chlorosulfonyl-isophthalic acid dimethyl ester (2.0 g,
• 6-Fluoro-5 -methanesulfonyl-N-methyl-N-prop yl-isophthalamic acid Mix 3-bromo-4-fluoro-5-me anes ⁇ dfonyl-N-memyl-N-propyl-benzamide (1.36 g, 3.86 mmol), palladium acetate (337 mg, 1.5 mmol) and l,4-bis(diphenylphosphino)- butane (1.35 g, 3.17 mmol) in DMSO (60 mL), tert-butanol (40 mL), triethylamine (3.88mL) and water (0.22 mL) under an atmosphere of carbon monoxide (100 psi) at 90 °C for 18 h.
• Preparation 95 5 -(Methanesulfonyl-methylamino)-N-methyl-N-propyl-isophthalamic acid 5-Amino-N-methyl-N-propyl-isophthalamic acid methyl ester Mix 5-nitro-isophthalic acid monomethylester (3.0 g, 13.32 mmol), l-(3- dimethylaminopropyl)-3-ethylcarbodiimide hydrochloride (3.20 g, 16.65 mmol), and 1- hydroxybenzotriazole (2.25 g, 16.65 mmol) in dichloromethane (100 mL) at room temperature for 20 min.
• 5-Hvdroxymethyl-N-methyl-N-propyl-isophthalamic acid ethyl ester Mix 5-hydroxymethyl-isophthalic acid monoethyl ester (3.3 g, 14.7 mmol), N- methyl propylamine (1.5 mL, 14.7 mmol), l-[3-(dimethylamino)propyl]-3- ethylcarbodiimide hydrochloride (2.8 g, 14.7 mmol), and 1-hydroxtbenzotriazole hydrate (2.0 g, 14.7 mmol) in dichloromethane (40 mL) and DMF (4 mL). Stir at room temperature for 3 h.
• 5-Isopropoxy-isophthalic acid monomethyl ester Stir 5-isopropoxy-isophthalic acid dimethyl ester (3.7 g, 14.7 mmol) and NaOH (0.56 g, 14 mmol) in methanol (100 mL) and water (2 mL) overnight at room temperature. Concentrate methanol and redissolve the residue in diethyl ether (100 mL) and water (100 mL). Separate the layers and wash with diethyl ether. Concentrate the diethyl ether layer and recover 5-isopropoxy-isophthalic acid dimethyl ester (0.45 g).
• 5-Isopropoxy-N-methyl-N-propyl-isophthalamic acid methyl ester Mix 5-isopropoxy-isophthalic acid monomethyl ester (3 g, 12.7 mmol), methyl propyl amine (1.3 mL, 12.7 mmol), l-[3-(dimethylamino)propyl]-3-ethylcarbodiimide hydrochloride (2.4 g, 12.7 mmol), and 1-hydroxybenzotriazole hydrate (1.7 g, 12.7 mmol) in dichloromethane (50 mL) and stir overnight at room temperature.
• the compounds of Preparation 100-101 may be prepared essentially as described in Preparation 99 using pyrrolidine or piperidine as the amine.
• the compounds of Preparation 104-107 may be prepared essentially as described in Preparation 103 using the appropriate diols or thiols.
• N-Methyl-5-(2-oxopyrrolidin-l-yl -N-propyl-isophthalamic acid methyl ester Mix 5-iodo-N-methyl-N-propyl-isophthalamic acid methyl ester (220 mg, 0.61 mmol), 2-pyrrolidone (56 ⁇ L, 0.73 mmol), ethane- 1,2-diamine (4 ⁇ L, 0.061 mmol), cesium carbonate (398 mg, 1.22) and copper (I) iodide (12 mg, 0.061 mmol) in 1,4- dioxane (4 mL). Heat the mixture to 110°C for 1 h then stir at room temperature overnight.
• Preparation 110 2'-Fluoro-5-(methyl-propylcarbamoyl)-biphenyl-3-carboxylic acid 2'-Fluoro-5-(methyl-propylcarbamoyl -biphenyl-3-carboxylic acid methyl ester
• 1,4-dioxane 10 mL
• 5-iodo-N-methyl-N-propyl-isophthalamic acid methyl ester (0.720 g, 2.00 mmol)
• 2-fluorophenylboronic acid 0.364 g, 2.60 mmol
• tetrakis(triphenylphosphine)palladium (0) 0.47 g, 0.300 mmol
• potassium carbonate 0.829 g, 6.00 mmol
• N-Methyl-N-propyl-5-(pyridine-3-carbonyl)-isophthalamic acid methyl ester Add THF (3 mL), N-methyl-N-propyl-5-tributylstannanyl-isophthalamic acid methyl ester (0.524 g, 1.00 mmol), nicotinoyl chloride hydrochloride (0.232 g, 1.30 mmol), 2-(di-tert ⁇ butylphosphino)biphenyl (0.045 g, 0.151 mmol), bis(dibenzylidene- acetone)palladium (0) (029 g, 0.05 mmol) to a sealed tube flushed with nitrogen.
• the compound of Preparation 114 is prepared essentially as described in Preparation 113 using the appropriate nicotinoyl chloride hydrochloride.
• N-Methyl-N-propyl-5-thiazol-2-yl-isophthalamic acid methyl ester To a previously nitrogen-flushed vessel, add zinc dust ( ⁇ 10 microns, 0.196 g, 3 mmol) and 1,2-dibromoethane (0.023 mL, 0.27 mmol) to THF (0.5 mL). Heat the solution until bubbles appear. Repeat the heating twice and cool to room temperature. Add chlorofrimethylsilane (15 ⁇ L) and 2-bromothiazole (90 ⁇ L, 1 mmol) in THF (0.4 mL). Stir at room temperature for 15 min.
• Preparation 120 5 -(Difluorofuran-2-ylmethyl)-N-methyl-N-propyl-isophthalamic acid 5-(2-Furan-2-yl-[l,3]dithiolan-2-yl -N-methyl-N-propyl-isophthalamic acid methyl ester Dissolve 5-(furan-2-carbonyl)-N-methyl-N-propyl-isophthalamic acid methyl • ester (290 mg, 0.88 mmol) in dichloromethane (2 mL).
• 5-Nifro-N,N-dipropyl-isophthalamic acid Dissolve 5-nitro-N,N-dipropyl-isophthalamic acid methyl ester (1.000 g, 3.243 mmol) and lithium hydroxide (0.089 g, 3.730 mmol) in a mixture of THF (3.16 mL), water (1.58 mL) and methanol (1.58 mL). Stir the mixture at room temperature until the starting material is consumed. Concentrate and acidify with 1 N HCI. Extract with ethyl acetate, dry (magnesium sulfate) and concentrate to give the title compound (0.874 g, 92%).
• 5-Acetyl-N-methyl-N-propyl-isophthalamic acid ethyl ester Treat a solution of 5-(l-hydroxyethyl)-N-methyl-N-propyl-isophthalamic acid ethyl ester (250 nig, 0.85 mmol) in dichloromethane (10 mL) with Dess-Martin periodinane (470 mg, 1.11 mmol). Stir at room temperature for 2.5 h, quench with 10% aqueous sodium sulfate, extract with ethyl acetate (50 mL).
• N-Methyl-N-propyl-5-(2,2,2-trifluoroacetyl)-isophthalamic acid ethyl ester Treat a solution of N-methyl-N-propyl-5-(2,2,2-trifluoro-l-hydroxyethyl)- isophthalamic acid ethyl ester (1.8 mmol) in dichloromethane (20 mL) with Dess-Martin reagent at room temperature for 2 h. Quench with 10% aqueous sodium sulfite and extract with ethyl acetate (100 mL).
• N-Methyl-N-propyl-5-(2,2,2-trifluoroacetyl)-isophthalamic acid N-Methyl-N-propyl-5-(2,2,2-trifluoro-l-hvdroxyethyl)-isophthalamic acid
• N-Methyl-N-propyl-5-(2,2,2-trifluoro-l-hvdroxyethyl)-isophthalamic acid Treat a solution of a mixture of N-methyl-N-propyl-5-(2,2,2-trifluoroacetyl)- isophthalamic acid (330 mg, 0.96 mmol) andN-methyl-N-propyl-5-(2,2,2-trifluoro-l- hydroxyethyl)-isophthalamic acid in a ratio of about 4:1 in ethanol (12 mL) with 2 N NaOH (0.72 mL, 1.43 mmol).
• 5-Difluoromethoxy-N-methyl-N-propyl-isophthalamic acid methyl ester Treat a solution containing crude 5-difluoromethoxy-isophthalic acid monomethyl ester (2.5 g, 10 mmol) in THF (20 mL) at room temperature with 1-hydroxtbenzotriazole hydrate (1.62 g, 12 mmol), 1,3-dicyclohexylcarbodiimide (12 mL, 1 N, 12 mmol), and n- methylpropylamine (1.23 mL, 12 mmol). Stir at room temperature overnight, filter through a filtering agent, wash with 1:1 ethyl acetate:hexanes (50 mL).
• N-Methyl-N-propyl-5-pyridin-4-yl-isophthalamic acid benzyl ester Add pyridine-4-boronic acid (2.361 g, 19.21 mmol) and 2 N sodium carbonate (19.21 mL, 38.42 mmol) to a solution of 5-iodo-N-methyl-N-propyl-isophthalamic acid benzyl ester (6.000 g, 13.72 mmol)in ethylene glycol dimethyl ether (206 mL) under nifrogen at room temperature. Add tetrakis(triphenylphosphine)palladium (0) (0.634 g, 0.549 mmol) and reflux for 20 h.
• 5-Dibenzylamino-4-fluoro-isophthalic acid 3 -ethyl ester Combine 5-bromo-3-dibenzylamino-2-fluorobenzoic acid ethyl ester (4.74 g, 10.7 mmol), palladium (II) acetate (0.72 g, 3.20 mmol), l,4-bis(diphenylphosphino)butane (2.84 g, 6.66 mmol), triethylamine (7.90 mL, 56.7 mmol), DMSO (150 mL), tert-butyl alcohol (100 mL), and water (0.50 mL, 27.8 mmol).
• 6-Fluoro-5-methanesulfonylamino-N-methyl-N-propyl-isophthalamic acid ethyl ester Dissolve 5-amino-6-fluoro-N-methyl-N-propyl-isophthalamic acid ethyl ester (0.162 g, 0.58 mmol) in dichloromethane (1.5 mL). Cool to 0 °C. Add pyridine (51.2 ⁇ L, 0.63 mmol) and methanesulfonyl chloride (44.5 ⁇ L, 0.58 mmol) to the solution.
• 6-Fluoro-5-(methanesulfonyl-methylamino -N-methyl-N-propyl-isophthalamic acid Dissolve the 6-fluoro-5-(methanesulfonyl-methyl-amino)-N-methyl-N-propyl- isophthalamic acid ethyl ester (110 mg, 0.30 mmol) in THF (7.5 mL). Add 1 N sodium hydroxide solution (1.48 mL, 1.48 mmol) and stir the resulting biphasic mixture vigorously for 4 h. Acidify with 1 N HCI (1.55 mL, 1.55 mmol) and concentrate the solution to a volume of about 3 mL.
• 2-Dipropylcarbamoyl-isonicotinic acid Heat a mixture of 4-chloropyridine-2-carboxylic acid dipropylamide (1.02 g, 4.2 mmol), palladium (II) acetate (11.3 mg, 0.05 mmol), triethylamine (1.0 mL, 7.1 mmol), l,r-bis(3,5-dimethylphenylphosphino)ferrocene (138 mg, 0.55 mmol), DMF (35 mL) and water (5 mL) at 110 °C under an atmosphere of carbon monoxide (200 psi) overnight.
• the compound of Preparation 139 may be prepared essentially as described in Preparation 138.
• the compounds of Preparations 141-142 may be prepared essentially as described in Preparation 140.
• the compound of EXAMPLE 28 may be prepared essentially as described in EXAMPLE 27.
• the compound of EXAMPLE 45 may be prepared essentially as described in EXAMPLE 44 beginning with the corresponding E-isomer.
• EXAMPLES 53 - 66 may be prepared essentially as described in EXAMPLE 52.
• EXAMPLES 77 - 78 may be prepared essentially as described in EXAMPLE 76.
• EXAMPLES 80 - 81 may be prepared essentially as described in EXAMPLE 79, except EXAMPLE 81 was deprotected with 4M HCI in dioxane.
• the compound of EXAMPLE 83 may be prepared essentially as described in EXAMPLE 82.
• the compounds of Formula I are inhibitors of BACE and thereby inhibit the production of A- ⁇ peptide which has been implicated in the pathology and progression of a number of neurodegenerative disorders, including Alzheimer's disease (See: Cumming, et al.. Current Opinion in Drug Discovery and Development, 7(4), 536-556, (2004); and Varghese, et al., Journal of Medicinal Chemistry, 46(22), 4625 (2003)).
• Methods for determining the BACE inhibitory activity of compounds are well known in the art (See: Sinha, et al., Science, 286, 735 (1999); Turner, et al-, Biochemistry.
• Serial dilutions of test compounds are prepared as described above. Two microliter of each dilution is added to each well on row A to H of a corresponding low protein binding black plate to which 50 microliter of 50 millimolar ammonium acetate, pH 4.6, 1 mM Triton X-100, lmg/ml Bovine Serum Albumin, and 15 micromolar of FRET substrate (sequence: (MCA)-S-E-V-N-L-D-A-E-F-R-K(Dnp)-R-R-R-R-NH 2 ) for BACE2 activity are pre-added. The content is mixed well on a plate shaker for 10 min.
• Human BACEl(l-460):Fc (t ⁇ BACEl :Fc) and murine BACEl(l-460):Fc (mwBACEl :Fc) were transiently expressed in HEK293 cells. 250 ⁇ g cDNA of each construct was mixed with Fugene 6 and added to 1 liter HEK293 cells. Four days after the fransfection, conditioned media were harvested for purification.
• huBACEl:Fc and muBACEl:Fc were collected. Cell debris was removed by filtering the conditioned media through 0.22 ⁇ m sterile filter. 5 ml Protein A-agarose (bed volume) was added to 4 liter conditioned media. This mixture was gently stirred overnight at 4° C. The Protein A-agarose resin was collected and packed into a low-pressure chromatography column. The column was washed with 20X bed volumes of PBS at flow rate 20 ml per hour.
• Bound /zwBACEl :Fc or muBACEl :Fc protein was eluted with 50 mM acetic acid, pH 3.6, at flow rate 20 ml per hour. 1 ml fractions of eluate were excralized immediately with 0.5 ml 200 mM ammonium acetate, pH 6.5. The purity of final product was assessed by elecfrophoresis in 4-20% Tris-Glycine SDS-PAGE. The enzyme was stored at -80C in small aliquots.
• the routine whole cell assay for the measurement of inhibition of beta-secretase activity utilizes the human embryonic kidney cell line HEK293p (ATCC Accession No. CRL-1573) stably expressing a human APP751 cDNA containing the naturally occurring double mutation Lys651Met52 to Asn651Leu652, commonly called the Swedish mutation (noted HEK293/APP751sw) and shown to overproduce Abeta (Citron et al, 1992, Nature 360:672-674).
• Human embryonic kidney HEK293p cells stably expressing wild-type human APP751 cDNA are also used to assess the inhibition of beta-secretase activity.
• animal models including mouse, guinea pig, dog, and monkey, may be used to screen for inhibition of beta- secretase activity in vivo following compound treatment.
• Animals used in this invention can be wild type, fransgenic, or gene knockout animals.
• the PDAPP mouse model prepared as described in Ganes et al., 1995, Nature 373:523-527, and other non-transgenic or gene knockout animals are useful to analyze in vivo inhibition of Abeta and sAPPbeta production in the presence of inhibitory compounds.
• brain tissue, plasma or cerebrospinal fluid is obtained from selected animals and analyzed for the presence of APP cleavage peptides, including Abeta peptides, sAPPbeta and other APP fragments, for example, by specific sandwich ELISA assays.
• animals are sacrificed and brain tissues, plasma or cerebrospinal fluid are analyzed for the presence of Abeta peptide and sAPPbeta.
• Brain tissues of APP fransgenic animals are also analyzed for the amount of beta-amyloid plaques following compound treatment.
• Animals (PDAPP or other APP fransgenic mice) a ⁇ jninistered an inhibitory compound may demonstrate the reduction of Abeta or sAPPbeta in brain tissues, plasma or cerebrospinal fluids and decrease of beta amyloid plaques in brain tissue, as compared with vehicle-treated controls.
• Animals (PDAPP or other APP fransgenic mice) administered the inhibitory compounds of the invention may also show improvement in cognitive behavioral assessments for learning and memory tasks.
• the carrier or excipient may be a solid, semi-solid, or liquid material that can serve as a vehicle or medium for the active ingredient. Suitable carriers or excipients are well known in the art.
• the pharmaceutical composition may be adapted for oral, inhalation, parenteral, or topical use and may be administered to the patient in the form of tablets, capsules, aerosols, inhalants, suppositories, solutions, suspensions, or the like.
• the compounds of the present invention may be administered orally, for example, with an inert diluent or capsules or compressed into tablets.
• the compounds may be incorporated with excipients and used in the form of tablets, troches, capsules, elixirs, suspensions, syrups, wafers, chewing gums and the like.
• These preparations should contain at least 4% of the compound of the present invention, the active ingredient, but may be varied depending upon the particular form and may conveniently be between 4% to about 70% of the weight of the unit.
• the amount of the compound present in compositions is such that a suitable dosage will be obtained.
• Preferred compositions and preparations of the present invention may be determined by methods well known to the skilled artisan.
• P-gp inhibitors and the use of such compounds are known to those skilled in the art. (See: Cancer Research, 53, 4595 (1993); Clin. Cancer Res., 2, 7 (1996); Cancer Research. 56, 4171 (1996); WO99/64001; and WO01/10387).
• the P-gp inhibitor may be administered in any manner that achieves a sufficient degree of inhibition of P-gp to achieve or maintain sufficient levels of the compounds of Formula I for effective BACE inhibition in the brain of an afflicted mammal.
• the P-gp inhibitor may be administered separately before, during, or after the adminisfration of a compound of Formula I.
• the P-gp inhibitor may be formulated with a compound of Formula I.

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