Abstract
ZrOCl2·8H2O supported on montmorillonite K10 (ZrOCl2/mont K10) catalyzed Biginelli reaction under solvent-free conditions is reported. The catalysts were characterized by XRD, FTIR, BET surface area analysis, and thermogravimetric analysis. The activity of montmorillonite K10, montmorillonite KSF, ZrOCl2·8H2O, SO42−/ZrO2, and ZrOCl2/mont K10s was investigated by Biginelli reaction of benzaldehyde, ethylacetoacetate and urea. The reactions were carried out by addition of ZrOCl2/mont K10 to a mixture of aldehyde, ethylacetoacetate and urea/thiourea with thorough stirring in the absence of solvent under conventional heating or microwave irradiation to prepare 3,4-dihydropyrimidin-2(1H)-one/thione derivatives at 80 °C in good yields.
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