Access to four-membered cyclic sulfinamides by energy transfer catalysis

-silyl sulfinylamines can undergo synthetically useful excited-state reactivity accessed using energy transfer catalysts and visible light. We exploit these intermediates in reactions with alkenes to form four-membered cyclic sulfinamide products. The reactions are efficient and broad in scope, and the products are advanced to sulfonamides as well as four-membered cyclic sulfonimidamides.