Edoxaban BOC hydroxy impurity

Edoxaban BOC hydroxy impurity is a structurally related synthetic byproduct arising from the BOC-protected hydroxylation of the parent anticoagulant edoxaban. It features a substituted chromene core with a sulfonamide moiety and a tert-butyloxycarbonyl (BOC)-masked hydroxyl group at the primary amine site. This impurity represents a key degradation pathway under acidic conditions, where the hydroxyl substitution disrupts the core’s pharmacophoric integrity. It serves as a critical HPLC reference standard for quantifying process-related impurities in edoxaban active pharmaceutical ingredient (API) batches.