Photoinduced electron transfer reaction of cyclopropanone acetals with arylmethyl methanesulfonate: generation of β-keto radical species and application to C–C bond formation

Abstract

The photoinduced electron transfer reaction of the cyclopropanone acetals 1 with arylmethyl methanesulfonates 4 or 10 as electron acceptors was found to generate a transient pair of radicals, the β-keto radical 3 and the arylmethyl radical, which underwent a novel carbon–carbon bond formation reaction at the sterically hindered β-position of the esters.