synthesis of N-methyl-3-chalcogeno-indoles has been developed via iodine-mediatedelectrophilicannulation reactions of 2-alkynylaniline derivatives with disulfides or diselenides. In the presence of iodine and iron, a variety of 2-alkynylanilines selectively underwent the electrophilicannulation with numerous disulfides or diselenides leading to the corresponding 3-sulfenylindoles and 3-selenenylindoles
An iodine-catalyzed regioselective sulfenylation of indoles in the presence of DMSO has been presented. Various indoles can react with aryl thiols or alkyl thiols to afford their corresponding 3-sulfenylindoles in good to excellent yields. The notable features of this protocol include easy operation, metal-free reaction conditions, and excellent functional group tolerance.