Vildagliptin carboxylic acid Methyl Ester

Vildagliptin carboxylic acid methyl ester is a synthetic derivative of the antidiabetic agent vildagliptin, featuring esterification of the parent compound's terminal carboxylic acid moiety with methanol. This modification introduces a methyl ester functional group at the C-terminus, retaining the pyrazine core and sulfonamide linkage characteristic of the parent drug. The compound arises as a process-related impurity during vildagliptin synthesis, specifically during esterification steps or hydrolysis-resistant intermediate formations. It serves as an HPLC reference standard for quantifying esterification byproducts in active pharmaceutical ingredient (API) impurity profiling.