PhI(OAc)2-mediated additions of 2,4-dinitrophenylsulfenamide with methylenecyclopropanes (MCPs) and a methylenecyclobutane (MCB)

PhI(OAc)2-mediated highly stereoselective addition of 2,4-dinitrophenylsulfenamide with methylenecyclopropanes (MCPs) to give the corresponding ring enlargement products in good yields.