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Substituted-1,2,4-triazines were conveniently prepared in one pot by the condensation of amides and 1,2-diketones in presence of base, followed by cyclisation with hydrazine hydrate.
A simple and efficient synthesis of substituted benzo [1,3] oxazine and benzo [1,3] thiazine derivatives under conventional heating, as well as microwave irradiation is reported. The compounds were obtained by the reaction of electron rich phenols, formaldehyde, and aromatic amines in methanol. Reactions which take 12-16 hr under conventional heating were successfully completed within a few minutes under microwave irradiation (solventless) with moderate to excellent yields.
Synthesis of 3,4-Dihydropyrimidin-2(1H)-ones and 3,4,5,6,7,8-Hexahydroquinazolin-2(1H)-ones via Three Component Cyclocondensation. -The title compounds (IV) and (VI), resp., are synthesized by Biginelli-type three-component cyclocondensation reactions of carbonyl compounds with aldehydes and urea/thiourea under thermal as well as microwave irradiation conditions. -(PHUCHO, I. T.; NONGPIUR, A.; NONGRUM, R.; NONGKHLAW*, R. L.; Indian J.
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