Abstract An efficient heterogeneous copper(I)-catalyzed three-component tandemcyclization of ketoxime acetates, aldehydes, and activated methylene compounds has been developed that proceeds smoothly in DMSO at 120 °C by using an 3-(2-aminoethylamino)propyl-modified MCM-41-bound copper(I) bromide [MCM-41-2N-CuBr] as the catalyst, delivering a variety of polysubstituted pyridines in good to high yields