Vilazidone N alkylated amino benzofuron amide impurity

Vilazidone N-alkylated amino benzofuron amide impurity is a structurally related API impurity arising from the N-alkylation of an amino substituent within the benzofuran amide scaffold of vilazidone. This impurity retains the core benzofuran-2-one moiety and the terminal amide functionality but incorporates an alkylated secondary amine at the nitrogen adjacent to the amide linkage, altering the compound’s lipophilicity and hydrogen-bonding capacity. The modification disrupts the parent drug’s serotonin-norepinephrine reuptake inhibition profile, rendering it pharmacologically inert. This impurity serves as a critical HPLC reference standard for quantifying process-derived alkylation byproducts during vilazidone synthesis.