期刊
ULTRASONICS SONOCHEMISTRY
卷 15, 期 2, 页码 129-132出版社
ELSEVIER
DOI: 10.1016/j.ultsonch.2007.02.003
关键词
ultrasound; bentonite clay; zirconium (IV) chloride; tetrahydropyrimidines
Sonication of aromatic aldehydes, urea and ethyl acetoacetate in presence of solvent (ethyl alcohol) or solvent-less dry media (bentonite clay) supported-zirconium (IV) chloride (ZrCl4) as catalyst at 35 kHz gives 6-methyl-4-substitutedphenyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylic acid ethyl esters proficiently in high yields. (c) 2007 Elsevier B.V. All rights reserved.
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