Switchable Copper‐Catalyzed Cascade Synthesis of Thiazolidine‐2‐thiones and Thiazole‐2(3H)‐thiones.

A novel copper-catalyzed cascade synthesis of thiazolidine-2-thiones from N -(2-bromoallyl)amines and carbon disulfide has been developed. The procedure combines carbamodithioic acid formation and copper-catalyzed intramolecular S-vinylation in one sequence. By elevating the temperature, the one-pot reaction efficiently affords thiazole-2(3 H )-thiones in moderate to good yields.