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Zr(HSO4)4-catalyzed one-pot three-component synthesis of 7-alkyl-6H,7H-naphtho[1′,2′:5,6]pyrano[3,2-c]chromen-6-ones

✍ Scribed by Xiao Wang; Guangzhou Lu; Fulin Yan; Weiwei Ma; Liqiang Wu

Publisher: Journal of Heterocyclic Chemistry
Year: 2011
Tongue: English
Weight: 83 KB
Volume: 48
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.755

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✦ Synopsis

Abstract

A new, one‐pot, simple thermally efficient and solvent‐free method for the preparation of 7‐alkyl‐6__H__,7__H__‐naphtho[1′,2′:5,6]pyrano[3,2‐c]chromen‐6‐ones by condensation of β‐naphthol, aromatic aldehydes, and 4‐hydroxycoumarin using Zr(HSO~4~)~4~ as a safe and efficient catalyst is described. This method has the advantages of high yields, a cleaner reaction, simple methodology, short reaction times, easy workup, and greener conditions. J. Heterocyclic Chem., (2011).

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