Patent ID: 7528135

Claim:
A compound of formula I or a pharmaceutically acceptable salt thereof wherein formula I is: wherein: (a) R 1 is selected from the group consisting of: (1) lower alkyl, and (2) C 3 -C 7 -cycloalkyl (b) X is C(O); (c) m is 1; (d) R 2 is selected from the group consisting of: (1) lower alkyl, (2) C 3 -C 7 -alkenyl, (3) C 3 -C 7 -alkinyl, (4) lower halogenalkyl, (5) lower hydroxyalkyl, (6) lower alkoxyalkyl, (7) unsubstituted C 3 -C 7 -cycloalkyl or C 3 -C 7 -cycloalkyl substituted by phenyl, (8) lower C 3 -C 7 -cycloalkylalkyl, (9) lower phenylalkyl wherein said phenyl is unsubstituted or mono- or disubstituted by lower alkyl, lower alkoxy, halogen or lower halogenalkyl, (10) unsubstituted pyridyl or pyridyl mono- or disubstituted by lower alkyl, lower alkoxy, halogen or lower halogenalkyl, (11) —NR 3 R 4 , (12) lower alkoxy, and (13) lower alkoxyalkoxy or alternatively, R 2 can also be unsubstituted phenyl or phenyl mono- or disubstituted by lower alkyl, lower alkoxy, halogen or lower halogenalkyl, (e) R 3 is hydrogen or lower alkyl; and R 4 is selected from the group consisting of: (1) lower alkyl, (2) C 3 -C 7 -alkenyl, (3) C 3 -C 7 -alkinyl, (4) lower alkoxyalkyl, (5) C 3 -C 7 -cycloalkyl, (6) C 3 -C 7 -cycloalkyl substituted by phenyl, (7) lower C 3 -C 7 -cycloalkylalkyl, (8) unsubstituted phenyl or phenyl mono- or disubstituted by lower alkyl, lower alkoxy, halogen or lower halogenalkyl, and (9) lower phenylalkyl wherein phenyl is unsubstituted or mono- or disubstituted by lower alkyl, lower alkoxy, halogen or lower halogenalkyl; or alternatively, R 3 and R 4 together with the nitrogen atom to which they are attached form a 4-, 5-, 6- or 7-membered heterocyclic ring optionally containing a further heteroatom of nitrogen, oxygen or sulfur, wherein said heterocyclic ring is optionally substituted by one, two or three groups independently selected from the group consisting of lower alkyl, lower alkoxy, lower alkoxycarbonyl, oxo, halogen and halogenalkyl, or said heterocyclic ring is optionally condensed with a C 5 -C 6 -cycloalkyl ring or a phenyl ring, wherein said cycloalkyl ring or phenyl ring is optionally substituted by one, two or three groups independently selected from the group consisting of lower alkyl, lower alkoxy, halogen and halogenalkyl.