摘要 : Sulfated zirconia (ZrO2/SO42-) solid superacid has been proved to be an efficient reusable heterogeneous catalyst for three-component one-pot cyclocondensation reaction of beta-dicarbonyl compounds and urea/thiourea with structura... 展开 Sulfated zirconia (ZrO2/SO42-) solid superacid has been proved to be an efficient reusable heterogeneous catalyst for three-component one-pot cyclocondensation reaction of beta-dicarbonyl compounds and urea/thiourea with structurally diverse aromatic aldehydes in solvent-free conditions to furnish the corresponding 3,4-dihydropyrimidin-2(1H)-ones and -thiones in good to excellent yields both under microwave irradiation and thermal conditions. 收起