Maleic acid catalyzed 3,4-Dihydropyrimidin-2-(1H)-ones and their thione analogues have been synthesized by condensation of aromatic aldehydes, β-dicarbonyl compound and urea or thiourea in the presence of alcohol-water (2:1; v/v) under mild reaction conditions. The yields obtained were excellent. The use of very cheap non-hazardous catalyst, environmentally benign solvent and easy work-up are the perspectives advantageous aspects of the present method.
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