Visible-light photoredox-catalyzed aryl radical in situ SO2-capture reactions†
Abstract
An aryl radical in situ SO2-capture reaction is reported for the first time. Using aryl diazonium salts as arylradical precursors, and vinyl triflates and allyl(alkynyl) trifluoromethylsulfones as radical acceptors and in situ SO2 donors, this protocol produces various β-keto, allyl and alkynyl arylsulfone derivatives, which are recognized as useful synthons. The reaction can be performed under mild visible-light photoredox-catalytic conditions without any external SO2 sources.