Electrochemical Migratory Cyclization of <i>N</i> ‐Acylsulfonimide and <i>N</i> ‐Arylsulfonyl Benzothiamide

An electrochemical migratory cyclization of N ‐acylsulfonylimine readily generates the biologically interesting sulfonylimine‐functionalized benzothiazine. The implementation of continuous flow electrolysis further enhances reaction efficiency and enables gram‐scale synthesis of this heterocyclic framework, providing the material basis for future biological activity studies. In addition, a straightforward electrochemical entry to the previously inaccessible benzothiazepine from N ‐arylsulfonyl benzothioamide is developed.