Vildagliptin dehydro diketo impurity is a dehydration-derived degradation product observed during synthesis and accelerated stability studies of vildagliptin. This polar impurity exhibits a diketo motif with an unsaturated bond formed by loss of hydrogen and likely arises from intramolecular dehydration under acidic or thermal conditions. Analytical characterization requires orthogonal methods such as gradient reversed-phase HPLC for quantification, high-resolution LC-MS for accurate mass confirmation, and 1H and 13C NMR for structural elucidation. Its presence can affect impurity profiling, specification setting, and control strategy development, prompting forced-degradation experiments and targeted cleanup steps to minimize formation during process development.
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