Iridium(III)-Catalyzed C–H Cyclization of Sulfoximines with Diazo Meldrum’s Acids for the Synthesis of Cyclic Sulfoximines

Iridium­(III)-catalyzed C–H cyclization of sulfoximines with diazo Meldrum’s acid provided cyclic sulfoximines with a carbonyl group in good to excellent yields. These compounds were easily converted into unsubstituted and arylated sulfoximines. Moreover, the vinyl triflates obtained from the cyclic sulfoximines underwent palladium­(II)-catalyzed cross-coupling reactions with a variety of aryl, arylalkynyl, and heteroatom (N and S) nucleophiles, affording a wide range of monosubstituted sulfoximines in high yields.