Synthesis of Dihydropyrrole Derivatives by Copper-Catalyzed Cyclization of γ,δ-Unsaturated Ketone O-Methoxycarbonyloximes
2-Bromomethyl-3,4-dihydro-2H-pyrroles are prepared from γ,δ-unsaturated ketone O-methoxycarbonyloximes by treatment with a catalytic amount of CuBr•SMe2 and LiBr.