Divergent Synthesis of Linear and Angular Furocoumarin Acetic Acids from Phloroglucinol
作者:Giovanna Delogu、Carmen Picciau、Elias Quezada、Lourdes Santana、Eugenio Uriarte
DOI:10.1055/s-2007-984536
日期:2007.7
Linear and angular furocoumarins can be obtained starting from phloroglucinol in a versatile, simple, direct, and efficient way, as demonstrated in the divergent syntheses described here. The key step is the alkali-mediated rearrangement of 4-halomethylcoumarins to benzofuran-3-acetic acids via α,β-unsaturated acids and the key intermediates are benzodipyrones, which, depending on their substitution, can either give or fail to give the ring-contraction reaction.
正如本文所述的不同合成方法所证明的那样,线型和角型呋喃香豆素可以通过一种多功能、简单、直接和高效的方法从氯代葡萄糖醇开始获得。关键步骤是通过δ,δ-不饱和酸将 4-卤甲基香豆素碱介导重排为苯并呋喃-3-乙酸,关键中间体是苯并二吡喃,根据其取代情况,可以产生或不产生缩环反应。