Oxygenophilic Lewis Acid Promoted Synthesis of 2-Arylindoles from Anilines and Cyanoepoxides in Alcohol
作者:Chuangchuang Xu、Jiaxi Xu
DOI:10.1021/acs.joc.8b02203
日期:2018.12.7
A convenient synthetic method to indoles from anilines and cyanoepoxides was developed under the catalysis of BF3·OEt2 or AlCl3 in alcohols. The reaction involves a tandem reaction of the regiospecific ring-opening of cyanoepoxides with anilines, elimination of cyanide, intramolecular aromatic electrophilic substitution, and water elimination. The Lewis acid generated protic acid is an efficient catalyst
在醇中BF 3 ·OEt 2或AlCl 3的催化作用下,开发了一种方便的由苯胺和氰基环氧化物合成吲哚的方法。该反应涉及氰基环氧化物与苯胺的区域特异性开环的串联反应,氰化物的消除,分子内芳族亲电子取代和水的消除。路易斯酸产生的质子酸是有效的催化剂。该方法的特点是易于获得的起始原料,广泛的底物范围,无过渡金属的环境以及氰基环氧化合物开环中的区域特异性。