Vildagliptin Amide impurity

Vildagliptin Amide impurity is a structurally related degradation byproduct of the antidiabetic agent Vildagliptin, characterized by an amide substitution at the terminal pyrrolidin-2-one ring. It retains the core 4-(3-piperidin-1-yl-propyl)phenyl moiety but features an amide linkage replacing the parent compound’s carboxamide side chain. This impurity arises via hydrolytic cleavage followed by amidation, introducing a secondary amide functional group adjacent to the pyrrolidone core. Its distinct polarity and H-bonding capacity influence chromatographic separation profiles. It serves as a critical HPLC reference standard for quantifying degradation pathways in Vildagliptin formulations.