Abstract
The combination of a benzenesulfinamide, trifluoromethanesulfonic anhydride, and Hunig's base brings about the cyclofunctionalization of unsaturated alcohols, phenols, acids, and sulfonamides to give the corresponding α-phenylsulfanylmethyl cyclic ethers, lactones and sulfonamides, respectively. In an unanticipated twist the products are isolated at the sulfur (II) oxidation state denoting an overall reduction in the oxidation state of the sulfur based electrophile in the course of the reaction.
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