Three new ways to synthesize 1,3 - azoles derivatives on mineral supports using Ca(OCl)(2)/Al2O3 or MnO2 / SiO2 or by fusion " in dry media " are described. The reactions are activated under microwave irradiation in a monomode Synthewave 402 reactor. The reaction times are considerably shortened and the products are obtained in higher yields and better purity, than compared to conventional heating. (C) 1998 Elsevier Science Ltd. All rights reserved.