Continuous‐Flow Electrosynthesis of Benzofused S‐Heterocycles by Dehydrogenative C−S Cross‐Coupling

Abstract Reported herein is the synthesis of benzofused six‐membered S‐heterocycles by intramolecular dehydrogenative C−S coupling using a modular flow electrolysis cell. The continuous‐flow electrosynthesis not only ensures efficient product formation, but also obviates the need for transition‐metal catalysts, oxidizing reagents, and supporting electrolytes. Reaction scale‐up is conveniently achieved through extended electrolysis without changing the reaction conditions and equipment.