Iodine/DMF-Mediated\nRegioselective Sulfenylation Using\nArenediazonium Tosylates and Sodium Metabisulfite: An Easy Access\nto 3‑Arylthioindoles

A practical C3 sulfenylation of indoles\nhas been accomplished\nusing\narenediazonium tosylates and sodium metabisulfite, with a key role\nof iodine/DMF combination in the reaction. The method involves scarce\nuse of sodium metabisulfite as a divalent sulfur source and offers\nan array of structurally diverse 3-arylthioindoles in high yields\nunder operationally simple transition-metal-free and mild conditions.