Patent ID: 7342027

Claim:
A compound of formula (I) or a pharmaceutically acceptable salt thereof: wherein: R 1 is a C 1-6 alkyl group optionally substituted with phenyl, C 1-6 alkoxy, or benzyloxy; a C 2-6 alkenyl group optionally substituted with phenyl; a C 3-6 cycloalkyl group; a C 1-5 alkoxy group; a phenyl group substituted with halogen, phenyl, trifluoromethoxy, oxopyrrolidyl, mono- or di-C 1-4 alkylamino or R 4 —C 1-4 alkoxy (wherein, R 4 is morpholine, pyrrolidine or piperidine); a furanyl group optionally substituted with one or more functional groups selected from the group consisting of C 1-6 alkyl, halogen, and oxopyrrolidyl; a benzofuranyl group optionally substituted with C 1-6 alkyl or R 4 —C 1-4 alkoxy (wherein, R 4 is morpholine, pyrrolidine or piperidine); a thiophenyl group substituted with C 1-6 alkyl or halogen; a C 1-6 alkyl-isoxazolyl group; a pyridyl group optionally substituted with halogen; a morpholinyl group; a benzothiophenyl group; a quinolinyl group; a pyrazinyl group; a benzyloxy group; an oxopyranyl group; a C 1-6 alkyl-7H-imidazo[2,1-b]oxazolyl group; a C 1-6 alkyl-chromon-2-yl group; or a (N-t-butoxycarbonyl)piperidinyl group, and R 2 and R 3 are, each independently, hydrogen; hydroxy; nitro; halogen; cyano; a C 1-6 alkyl group optionally substituted with one or more halogen atoms; C 1-5 alkoxy; C 1-5 alkyl-thio; furyl; 1H-tetrazol-5-yl; oxazolyl; or a group selected from the formula consisting of (II), (III) and (IV): wherein, R 5 is hydrogen; hydroxy; C 1-6 alkyl; C 1-5 alkoxy; mono- or di-C 1-6 alkylamino; or C 3-6 cycloalkylamino, R 6 is C 1-6 alkyl; phenyl optionally substituted with a C 1-4 alkoxy group; benzyl optionally substituted with a C 1-4 alkoxy group, R 7 and R 8 are, each independently, hydrogen; a C 1-6 alkylcarbonyl group optionally substituted with halogen, C 1-4 alkoxy, or phenyl; C 2-6 alkenylcarbonyl; C 1-4 alkoxycarbonyl; C 3-6 cycloalkylcarbonyl; benzoyl optionally substituted with one or more halogen atoms; mono- or di-C 1-4 alkylcarbamoyl; or C 1-4 alkylsulfonyl, or bonded each ether to form a morpholine, azetidin-2-one, 3,3-dimethylazetidin-2-one, pyrrolidin-2-one, pyrrole, 2,5-dihydropyrrole, piperidin-2-one, oxazolidin-2-one, imidazolidin-2-one, imidazolidin-2,5-dione, tetrazole, 1,1-dioxoisothiazolidine, or C 1-6 alkyl-aziridin-2-one ring, and n is 0, 1, or 2.