Patent ID: 7550455

Claim:
A compound of formula wherein R 1 is (a) a heteroaryl-C 1-3 -alkyl group, wherein heteroaryl is selected from the group consisting of phenylpyrimidinyl, quinolinyl, isoquinolinyl, quinazolinyl, quinoxalinyl, naphthyridinyl and phenanthridinyl which may be optionally substituted by R 10 , R 11 and R 12 , where R 10 is selected from hydrogen, fluorine, chlorine, bromine, methyl, difluoromethyl, trifluoromethyl, phenyl, cyano, methoxy, difluoromethoxy, trifluoromethoxy, amino, methylamino, dimethylamino, pyrrolidin-1-yl, piperidin-1-yl or morpholin-4-yl group; R 11 is selected from hydrogen, methyl, methoxy or cyano; and R 12 is hydrogen or methyl, or (b) a naphthyl-C 1-3 -alkyl group, which may be substituted by R 13 and R 14 , where R 13 is selected from hydrogen, fluorine, chlorine, bromine methyl, difluoromethyl, trifluoromethyl, cyano, methoxy, difluoromethoxy or trifluoromethoxy; and R 14 is selected from hydrogen, methyl, methoxy or cyano; R 2 is selected from methyl, ethyl, propyl, isopropyl, cyclopropyl or phenyl; R 3 is selected from 2-butyn-1-yl, 1-buten-1-yl, 2-buten-1-yl or 3-methyl-2-buten-1-yl and n is 1 or 2; or a tautomer, enantiomer, diastereomer, mixture, prodrug or salt thereof.