Benzene fused 6-membered ring derivatives and their use as DPP-4 inhibitors

摘要

The present invention relates to benzene-fused six-membered ring derivatives and their use as DPP-4 inhibitors. Specifically, the present invention relates to a compound represented by formula I, a drug composition comprising a compound represented by formula I, and a drug for treating a DPP-4-related disease or a drug for inhibiting DPP-4. Relates to the use of compounds.