Visible Light-Promoted Synthesis of β-Keto Sulfoximines from N -Tosyl-Protected Sulfoximidoyl Chlorides.

Under visible light, N -tosyl-protected sulfoximidoyl chlorides react with aryl alkynes to give β-keto sulfoximines. The reaction is characterized by a high functional group tolerance and good yields. It can be improved by the presence of a ruthenium photocatalyst. Air is the source of the ketonic oxygen in the products.