Abstract
5-Carboxanilide-dihydropyrimidinone derivatives were prepared by three-component Biginelli reaction of acetoacetanilide, aromatic aldehydes and thiourea in the presence of CeCl3 as an expedient catalyst and used as key intermediates for the highly efficient and eco-friendly synthesis of new and densely functionalized thiazolo[3,2-a]pyrimidin derivatives with use of dimethyl and diethyl acetylenedicarboxylate in ethanol at ambient temperature (conventional magnetic stirring).
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