A series of triazepane derivatives such as (R)-3-amino-1-(1, 2, 5-triazepan-1-yl)-4-(2, 4, 5- trifluorophenyl) butan-1-ones (7, 13a–p) and (R)-3-amino-1-(1, 2, 5-triazepan-5-yl)-4-(2, 4, 5- trifluorophenyl) butan-1-ones (17a–e) was synthesized and evaluated for their ability to inhibit dipeptidyl peptidase IV (DPP-IV) enzyme. Compounds with the acid moiety were found to be potent inhibitors of DPP-IV without inhibiting CYP 3A4. Among them, ...