The development of efficient and sustainable methods to obtain
spirocyclic compounds is of significance as these structures are widely
found in pharmaceuticals and agrochemicals. Herein, we disclose an
electrochemical dearomative spirocyclization of N-acyl sulfonamides in a
continuous-flow cell. The reaction is simple and efficient without
external catalysts or supporting electrolytes, in-cluding a
decagram-scale synthesis.