A compound of general formula I wherein: W is a group A-[(CH 2) m -O] wherein: m is zero, 1, 2, or 3; A is (C 1 -C 4)alkyl optionally substituted with one to three fluorine atoms; (C 3 -C 6)cycloalkyl; phenyl optionally susbstituted with a group selected from halo, methyl, methoxy, trifluoromethyl, acetylamino, and dimethylaminomethyl; thienyl optionally substituted with a chloro group; furanyl; isoxazolyl, thiazolyl; piperidinyl; morpholinyl; pyridinyl or pyrimidinyl, the pyridinyl and pyrimidinyl ring being optionally substituted with one or two methoxy groups; J independently is hydrogen, (C 1 -C 4)alkyl; (C 1 -C 4)alkoxy; or an halo group; n is 1 or 2; R 1 is hydrogen; (C 1 -C 4)alkyl optionally substituted with a hydroxy group or a (C 1 -C 4)alkoxy group; or (C 3 -C 8)cycloalkyl; R 2 and R 2' are independently hydrogen; (C 1 -C 4)alkyl optionally substituted with a (C 1 -C 4)alkoxy group; phenyl optionally substituted with a (C 1 -C 4)alkyl, a (C 1 -C 4)alkoxy or an halo group; benzyl optionally substituted with a (C 1 -C 4)alkyl, a (C 1 -C 4)alkoxy or an halo group on the benzene ring; or R 2 and R 2' taken together with the adjacent carbon atom form a (C 3 -C 6)cycloalkylidene group. R 3 is hydrogen; or (C 1 -C 4)alkyl; R 4 is hydrogen; (C 1 -C 4)alkyl; phenyl; cyclohexyl; or benzyl; or R 3 and R 4, taken together with the adjacent nitrogen atom, form an azetidinyl, pyrrolidinyl, morpholinyl, piperidinyl or piperazinyl ring, the piperidinyl ring being optionally substituted with one or two (C 1 -C 2)alkyl group(s), and the piperazinyl ring being optionally substituted on the other N-atom with a (C 1 -C 4)alkyl, benzyl, or phenylsulfonyl group; or a pyrrolidinyl, piperidinyl, morpholinyl or piperazinyl ring fused with a benzene ring; R 5 is hydrogen or fluoro; and R 6 is fluoro; if the case, either as single optical isomer in the isolated form or as a mixture thereof in any proportion and its pharmaceutically acceptable salt. W is a group A-[(CH 2) m -O] wherein: m is zero, 1, 2, or 3; A is (C 1 -C 4)alkyl optionally substituted with one to three fluorine atoms; (C 3 -C 6)cycloalkyl; phenyl optionally susbstituted with a group selected from halo, methyl, methoxy, trifluoromethyl, acetylamino, and dimethylaminomethyl; thienyl optionally substituted with a chloro group; furanyl; isoxazolyl, thiazolyl; piperidinyl; morpholinyl; pyridinyl or pyrimidinyl, the pyridinyl and pyrimidinyl ring being optionally substituted with one or two methoxy groups; J independently is hydrogen, (C 1 -C 4)alkyl; (C 1 -C 4)alkoxy; or an halo group; n is 1 or 2; R 1 is hydrogen; (C 1 -C 4)alkyl optionally substituted with a hydroxy group or a (C 1 -C 4)alkoxy group; or (C 3 -C 8)cycloalkyl; R 2 and R 2' are independently hydrogen; (C 1 -C 4)alkyl optionally substituted with a (C 1 -C 4)alkoxy group; phenyl optionally substituted with a (C 1 -C 4)alkyl, a (C 1 -C 4)alkoxy or an halo group; benzyl optionally substituted with a (C 1 -C 4)alkyl, a (C 1 -C 4)alkoxy or an halo group on the benzene ring; or R 2 and R 2' taken together with the adjacent carbon atom form a (C 3 -C 6)cycloalkylidene group. R 3 is hydrogen; or (C 1 -C 4)alkyl; R 4 is hydrogen; (C 1 -C 4)alkyl; phenyl; cyclohexyl; or benzyl; or R 3 and R 4, taken together with the adjacent nitrogen atom, form an azetidinyl, pyrrolidinyl, morpholinyl, piperidinyl or piperazinyl ring, the piperidinyl ring being optionally substituted with one or two (C 1 -C 2)alkyl group(s), and the piperazinyl ring being optionally substituted on the other N-atom with a (C 1 -C 4)alkyl, benzyl, or phenylsulfonyl group; or a pyrrolidinyl, piperidinyl, morpholinyl or piperazinyl ring fused with a benzene ring; R 5 is hydrogen or fluoro; and R 1 is hydrogen; (C 1 -C 4)alkyl optionally substituted with a hydroxy group or a (C 1 -C 4)alkoxy group; or (C 3 -C 8)cycloalkyl; R 2 and R 2' are independently hydrogen; (C 1 -C 4)alkyl optionally substituted with a (C 1 -C 4)alkoxy group; phenyl optionally substituted with a (C 1 -C 4)alkyl, a (C 1 -C 4)alkoxy or an halo group; benzyl optionally substituted with a (C 1 -C 4)alkyl, a (C 1 -C 4)alkoxy or an halo group on the benzene ring; or R 2 and R 2' taken together with the adjacent carbon atom form a (C 3 -C 6)cycloalkylidene group. R 3 is hydrogen; or (C 1 -C 4)alkyl; R 4 is hydrogen; (C 1 -C 4)alkyl; phenyl; cyclohexyl; or benzyl; or R 3 and R 4, taken together with the adjacent nitrogen atom, form an azetidinyl, pyrrolidinyl, morpholinyl, piperidinyl or piperazinyl ring, the piperidinyl ring being optionally substituted with one or two (C 1 -C 2)alkyl group(s), and the piperazinyl ring being optionally substituted on the other N-atom with a (C 1 -C 4)alkyl, benzyl, or phenylsulfonyl group; or a pyrrolidinyl, piperidinyl, morpholinyl or piperazinyl ring fused with a benzene ring; R 5 is hydrogen or fluoro; and R 6 is fluoro; if the case, either as single optical isomer in the isolated form or as a mixture thereof in any proportion and its pharmaceutically acceptable salt.