Discovery of potent dipeptidyl peptidase IV inhibitors derived from β-aminoamides bearing substituted [1,2,3]-triazolopiperidines for the treatment of type 2 diabetes

A series of novel [1,2,3]-triazolopiperidine derivatives 5a–5y were synthesized and evaluated as inhibitors of dipeptidyl peptidase IV (DPP-4) for the treatment of type 2 diabetes, most of the compounds exhibited excellent in vitro potency (IC50 <50 nM) against DPP-4. Among these, compound 5d with potent in vitro activity against DPP-4 and good pharmacokinetic profiles exhibited pronounced in vivo efficacy in an oral glucose tolerance test (OGTT) in ICR mice. On the base of these properties, compound 5d was selected as a potential new candidate for the treatment of type 2 diabetes.

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