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4-Aryl/alkyl-3, 4-dihydro-2(1H)-pyrimidone esters and 5-acetyl-4-aryl/or alkyl-6-methyl- 3, 4-dihydropyrimidin-2(1)-ones were synthesised efficiently using montmorilloniteclay- SmCl3 6H2O system promoted by microwave irradiation in solventless condition.