Simple and Efficient Synthesis
of Racemic Substituted Mandelic Acid Esters from Nonactivated Arenes
and Ethyl Glyoxylate
作者:Janusz Jurczak、Jacek Kwiatkowski、Jakub Majer、Piotr Kwiatkowski
DOI:10.1055/s-0028-1083154
日期:——
Direct synthesis of racemic aromatic α-hydroxyacetic acid esters via Friedel-Crafts reaction of nonactivated, simple arenes with ethyl glyoxylate promoted by SnCl 4 or AlCl 3 is described. The use of SnCl 4 opens a fast access to various alkyl- and aryl-substituted mandelic acids esters at room temperature within two hours in good yield (>80%) and with high regioselectivity. The procedure was successfully
描述了通过非活化的简单芳烃与乙醛酸乙酯在 SnCl 4 或 AlCl 3 促进下的傅克反应直接合成外消旋芳族 α-羟基乙酸酯。SnCl 4 的使用开启了在室温下两小时内快速获得各种烷基和芳基取代的扁桃酸酯的途径,产率高(>80%),区域选择性高。该程序也成功地用于具有稠合芳环的化合物的烷基化。使用 AlCl 3 的替代羟烷基化反应需要更长的反应时间和更高的温度才能获得良好的收率。