AlCl<sub>3</sub>-Mediated Direct Carbon−Carbon Bond-Forming Reaction of α-Hydroxyketene-<i>S</i>,<i>S</i>-acetals with Arenes and Synthesis of 3,4-Disubstituted Dihydrocoumarin Derivatives
作者:Cheng-Ri Piao、Yu-Long Zhao、Xiao-Dan Han、Qun Liu
DOI:10.1021/jo702414y
日期:2008.3.1
α-hydroxyketene-S,S-acetals and various arenes via direct substitution of the hydroxy group in alcohols has been developed. On the basis of this C−C coupling reaction, a series of bio- and pharmacologically important 3,4-disubstituted dihydrocoumarins, difficult to obtain by other methods, were prepared in high yields by a sequential Friedel−Crafts alkylation and intramolecular annulation reaction of α-hydroxyketene
通过醇中羟基的直接取代,已经开发了一种简单有效的AlCl 3介导的C-C偶联反应,该反应易于获得的α-羟基烯酮S,S-乙缩醛与各种芳烃之间。在此C-C偶联反应的基础上,通过顺序的Friedel-Crafts烷基化反应和分子内环化反应,高收率制备了一系列生物和药理学上很重要的3,4-二取代的二氢香豆素,很难用其他方法获得。在温和条件下,α-羟基烯酮无环-S,S-缩醛与酚的关系。