Copper-catalyzed [3 + 2]-cycloaddition of α-halonitroalkenes with azomethine ylides: facile synthesis of multisubstituted pyrrolidines and pyrroles

An approach to multisubstituted pyrrolidines, pyrrolines and pyrroles is developed based on [3 + 2]-cycloaddition of α-halo (F, Cl, Br) nitroalkenes.