Silver-Catalyzed C(sp2)-H Functionalization/C-O Cyclization Reaction at Room Temperature

Silver-catalyzed C(sp(2))-H functionalization/CO cyclization has been developed. The scalable reaction proceeds at room temperature in an open flask. The present method exhibits good functional-group compatibility because of the mild reaction conditions. Using a AgNO3 catalyst and a (NH4)(2)S2O8 oxidant in CH2Cl2/H2O solvent, various lactones are obtained in good to excellent yields. A kinetic isotope effect (KIE) study indicates that the reaction may occur via a radical process.