Visible‐Light‐Promoted Difluoromethylation/Cyclization of 1‐Acryloyl‐2‐cyanoindole for Construction of Difluoromethylated Pyrrolo[1,2‐a]indolediones

Abstract A visible‐light‐promoted cascade difluoromethylation/cyclization reaction to access various difluoromethylated pyrrolo[1,2‐ a ]indolediones was developed using difluoromethyltriphenylphosphonium bromide salt as the difluoromethylating reagent. A possible radical mechanism has been investigated and proven as a single electron transfer (SET) procedure.