期刊
TETRAHEDRON LETTERS
卷 48, 期 18, 页码 3299-3303出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.tetlet.2007.02.135
关键词
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Diammonium hydrogen phosphate, (NH(4))(2)HPO(4)(DAHP), efficiently catalyzes the one-pot, three-component reaction of an aromatic aldehyde, malononitrile and 4-hydroxycoumarin in aqueous media under mild conditions at room temperature, to afford the corresponding dihydropyrano[c]chromenes in high yields. (S)-Proline has also been used as another neutral catalyst for this reaction at reflux. (c) 2007 Elsevier Ltd. All rights reserved.
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