Patent ID: 7135472

Claim:
A compound of Formula I or a pharmaceutically acceptable salt thereof wherein R 1 is selected from the group consisting of straight or branched chain C 1-6 alkyl optionally substituted with amino, C 1-4 alkylamino or di(C 1-4 alkyl) amino, pyridinyl, pyrrodidinyl, piperidinyl, 2-thienyl, furanyl, imidazolyl, indenyl, benzofuran, C 3-6 cycloalkyl and phenyl optionally substituted with substituent independently selected from the group consisting of halogen, C 1-4 alkyl, C 1-4 alkoxy, trifluoromethyl, and trifluoromethoxy; A is —CH═CH—, 1,1-cyclopropyl, or —(CH 2 ) n —; R 2 is C 1-4 alkyl, CF 3 or hydroxymethyl; R 3 , R 4 , R 5 and R 6 each are independently hydrogen or fluoro; n is an integer of 0 to 4, inclusive; Het is selected from the group consisting of pyridinyl, pyrimidinyl, pyrazinyl, thiazolyl, imidazolyl, isoxazolyl, oxazolyl, pyrazolyl and triazolyl optionally substituted with substituents independently selected from the group consisting of C 1-4 alkyl, halogen, amino and dimethylaminomethyl; provided that when Het is pyridinyl, pyrimidinyl or pyrazinyl, then A is not —CH═CH—.