Journal
CATALYSIS COMMUNICATIONS
Volume 9, Issue 3, Pages 470-474Publisher
ELSEVIER
DOI: 10.1016/j.catcom.2007.07.005
Keywords
coumarin-3-carboxylic acids; 3-acetyl-coumarins; recyclable catalysts; heteropolyacids
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Coumarin-3-carboxylic acids and 3-acetyl-coumarins were obtained in high yields with excellent purity from ortho-hydroxybenzaldehydes and 1-ethylacetoacetate or malonic acid after a 2 h reflux in ethanol in the presence of a catalytic amount of different heteropolyacids (HPAs). The less reactive 1-(2-hydroxy-phenyl)-ethanone was first reacted with alcoholic ammonia to form ketimines, which were then condensed with 1-ethylacetoacetate or malonic acid to generate 4-methyl coumarin-3-carboxylic acids and 4-methyl 3-acetyl-coumarins in moderate yields. (C) 2007 Elsevier B.V. All rights reserved.
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