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卷 44, 期 8, 页码 1599-1602出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/S0040-4039(03)00012-1
关键词
4-hydroxycoumarin; fused pyrrole ring
Various trisubstituted [1]benzopyrano[4,3-b]pyrrol-4(1H)-one derivatives have been synthesized from 4-hydroxycoumarin with a 30-40% yield over six steps. The key step of the synthesis is a base-promoted intramolecular cyclization of enamines 5, followed by dehydration to generate the fused pyrrole ring. (C) 2003 Elsevier Science Ltd. All rights reserved.
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