A visible-light-induced carbonylation of indoles with phenols for the synthesis of indole-3-carboxylates has been developed. The reaction proceeded via a radical carbonylation process in which elementary I2 was used as an effective photosensitive initiator and, thus, avoided the use of transition metal catalysts. A series of different aryl indole-3-carboxylates were prepared in moderate to good yields
已开发出用于合成 indole-3-carboxylates 的可见光诱导的吲哚与酚的羰基化反应。该反应通过自由基羰基化过程进行,其中使用元素 I 2作为有效的光敏引发剂,从而避免使用过渡金属催化剂。以中等至良好的产率制备了一系列不同的芳基吲哚-3-羧酸酯。几种含酚天然产物和药物的后期功能化进一步突出了该方法的广泛适用性。
A General Method for Palladium-Catalyzed Direct Carbonylation of Indole with Alcohol and Phenol
作者:Rui Lang、Lijun Shi、Dengfeng Li、Chungu Xia、Fuwei Li
DOI:10.1021/ol3017726
日期:2012.8.17
A novel strategy involving a first oxidative iodination and subsequent Pd-0-catalyzed carbonylation to yield indole-3-carboxylate has been developed. It showed perfect generality to indole, alcohol, and phenol. The current methodology could also be conveniently applied to the synthesis of biologically active tropisetron from simple indole and tropine.