A photoinduced three‐component reaction of thianthrenium salts, DABCO·(SO2)2, and benzyl ether substituted alkenes

Abstract A photoinduced three‐component reaction of thianthrenium salts, DABCO ⋅ (SO 2 ) 2 , and benzyl ether substituted alkenes is developed, affording δ‐hydroxylsulfones with good functional group tolerance. This transformation proceeds through an anti‐Markovnikov hydrosulfonylation of alkenes under a mild reaction condition. Mechanism studies indicates that this reaction undergoes a radical pathway involving sulfur dioxide insertion and 1,5‐hydrogen transfer processes.