✦ LIBER ✦

Highly efficient intramolecular cyclizations of 2′-hydroxychalcones to 4-chloro-2H-chromenes under vilsmeier conditions

✍ Scribed by Zhen-Hua Li; Cun Zheng; Wei-Ke Su

Publisher: Journal of Heterocyclic Chemistry
Year: 2008
Tongue: English
Weight: 321 KB
Volume: 45
Category: Article
ISSN: 0022-152X
DOI: 10.1002/jhet.5570450441

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✦ Synopsis

Abstract

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Highly efficient intramolecular cyclization and of 2′‐hydroxychalcones to 4‐chloro‐2__H__‐chromenes under Vilsmeier conditions have been developed. In comparison with the reported methods, studies carried out indicate that Vilsmeier reagent generated in situ from DMF and bis(trichloromethyl) carbonate (BTC) provides excellent chemselectivity, higher yields and avoids the formation of inorganic phosphorus salts.

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