synthesized regioselectively in good to high yields by condensation of N,N-disubstituted thioureas and ethyl chloroacetate in the presence of basic ionicliquid [bmim]OH as a catalyst under conventional and ultrasonicirradiation conditions. Underultrasonicirradiation, the reaction furnished the desired 2-iminothiazolidinones in higher yields (76–87%) and lower reaction times (30–55 min). GRAPHICAL ABSTRACT