Pyrido[2, 1-A]-isoquinoline derivatives as DPP-IV inhibitors

摘要

The present invention provides compounds of formula (I) wherein R¹, R², R³ and R⁴ are as indicated in the description, or a pharmaceutically acceptable salt thereof. The compounds are useful for the treatment of diseases which are associated with DPP-IV, such as diabetes, particularly non-insulin dependent diabetes mellitus, and impaired glucose tolerance.