Hypervalent Iodine(III)-Mediated Oxidative Decarboxylation of β,γ-Unsaturated Carboxylic Acids

A novel oxidative decarboxylation of β,γ-unsaturated carboxylic acids mediated by hypervalent iodine­(III) reagents is described. The decarboxylative C–O bond forming reaction proceeded in the presence of PhI­(OAc)2 to give the corresponding allylic acetates. In addition, decarboxylative C–N bond formation was achieved by utilizing hypervalent iodine­(III) reagents containing an I–N bond. Mechanistic studies suggest the unique reactivity of hypervalent iodine reagents in this ionic oxidative decarboxylation.