Synthesis of Flavones and γ-Benzopyranones Using Mild Sonogashira Coupling and 18-Crown-6 Ether Mediated 6-<i>endo</i>Cyclization
作者:Da-Wei Chuang、Mohamed El-Shazly、Barve Balaji D.、Yu-Ming Chung、Fang-Rong Chang、Yang-Chang Wu
DOI:10.1002/ejoc.201200529
日期:2012.8
An efficient method for the synthesis of flavones and γ-benzopyranones has been developed utilizing a mild Sonogashira coupling and 18-crown-6 ether mediated 6-endo cyclization of o-alkynoylphenyl acetates. By using this strategy, flavones and γ-benzopyranones bearing electron-donating groups, halogens, and simple alkyl substituents were synthesized in satisfactory yields.
利用温和的 Sonogashira 偶联和 18-crown-6 醚介导的邻炔基苯乙酸酯的 6-内环化,开发了一种合成黄酮和 γ-苯并吡喃酮的有效方法。通过使用该策略,以令人满意的收率合成了带有给电子基团、卤素和简单烷基取代基的黄酮和γ-苯并吡喃酮。