Department of Chemistry, Shahid Beheshti University, PO Box 19839-4716, Tehran, Iran
Abstract:
Spiro-fused heterocycles were synthesized in good to high yields by a pseudo four-component reaction of an aldehyde, urea and a cyclic β-diester or a β-diamide such as Meldrum’s acid or barbituric acid derivatives using microwave irradiation under solvent-free conditions.