Regioselective 1, 3-dipolar cycloaddition of nitrilimines with 5-arylidene-2-arylimino-4- thiazolidinones and with 2-(4-arylidene) thiazolo [3, 2-a] benzimidazol-3 (2H)-ones afforded the corresponding 1, 3, 4-triaryl-5-N-arylpyrazole-carboxamides and pyrazolylbenzimidazoles. All reactions were carried out under conventional thermal heating and/or microwave irradiation. Both the pyrazole-5-carboxamides and ...