Rhodium-Catalyzed [4 + 3] Annulations of Sulfoximines with α,β-Unsaturated Ketones Leading to 1,2-Benzothiazepine 1-Oxides

A Cp*Rh(III) complex has been used as catalyst for the preparation of unprecedented 1,2-benzothiazepine 1-oxides by [4 + 3] cyclization of NH-sulfoximines with α,β-unsaturated ketones. For a wide range of substrates with various functional groups, moderate to good product yields were obtained.