Abstract
The Biginelli reaction, which involves the one-pot acid catalyzed cyclocondensation of ethyl acetoacetate, urea, and arylaldehyde, was first discovered by Italian chemist Pietro Biginelli about 120 years ago. A large number researchers have shown persistent attention to the study of Biginelli reaction on account of its significant biological and pharmaceutical activities and diversity of structural changes of dihydropyrimidines (DHPMs) and its derivatives. Herein, the synthesis of C(5)-(p-toluoyl)-3,4-dihydropyrimidin-2(1H)-ones (or -thiones) via Biginelli reaction has been accomplished from aldehydes, p-toluoylacetone, and urea or thiourea in the presence of TsOH promoted with microwave irradiation under solvent-free condi- tions in good yields and high purity without chromatographic separation. Keywords Biginelli reaction; 3,4-dihydropyrimidin-2(1H)-ones (or -thiones); β-diketone; microwave irradittion
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