Pyridine and quinoline derivatives

A compound of formula (I)

• 38
• wherein
• R1 is hydrogen or lower alkyl;
• R2 is heterocyclyl;
• heterocyclyl mono-, di-, or tri-substituted, independently, by lower alkyl, lower alkoxy, perfluoro-lower alkyl, amino or halogen;
• aryl;
• or aryl mono-, di-, or tri-substituted, independently, by halogen, lower alkyl, lower alkoxy, amino or perfluoro-lower alkyl;
• R3 and R4 together with the carbon atoms to which they are attached form:
• a phenyl ring which is optionally mono-, di- or tri-substituted, independently, by halogen, lower alkyl, perfluoro-lower alkyl or lower alkoxy;
• or
• a 5-, 6- or 7-membered saturated ring which optionally contains a heteroatom selected from O, N and S, and which saturated ring is optionally mono-, di- or tri-substituted, independently, by halogen, lower alkyl, perfluoro-lower alkyl or lower alkoxy, said saturated ring being ortho-fused to a 5- or 6-membered aromatic ring which optionally contains a heteroatom selected from O, N and S, and which aromatic ring is optionally mono-, di- or tri-substituted, independently, by halogen, lower alkyl, perfluoro-lower alkyl or lower alkoxy;
• and pharmaceutically acceptable salts thereof