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Efficient synthesis of trisubstituted [1]benzopyrano[4,3-b]pyrrol-4(1H)-one derivatives from 4-hydroxycoumarin

✍ Scribed by Yuan-Xiu Liao; Pei-Yu Kuo; Ding-Yah Yang

Publisher: Elsevier Science
Year: 2003
Tongue: French
Weight: 128 KB
Volume: 44
Category: Article
ISSN: 0040-4039
DOI: 10.1016/s0040-4039(03)00012-1

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✦ Synopsis

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.

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