Practical synthesis of 3,3-substituted dihydroquinoxalin-2-ones from aryl 1,2-diamines using the Bargellini reaction
作者:Thomas A. Alanine、Stephen Stokes、James S. Scott
DOI:10.1016/j.tetlet.2016.08.057
日期:2016.9
The reaction of aromatic 1,2-diamines with trichloromethylcarbinols under mild, basic phase-transfer conditions provided expedient access to 3,3-disubsituted quinoxalin-2(1H)-ones in good to moderate yields. The use of unsymmetrical aryl diamines gave a regioisomeric mixture of products with the ratio shown to be dependent on the electronic nature of the aromatic substituents. 2,3-Diaminopyridines
在温和的碱性相转移条件下,芳族1,2-二胺与三氯甲基甲醇的反应可方便地获得3,3-二取代的喹喔啉-2(1 H)-酮,收率良好。不对称芳基二胺的使用产生了产物的区域异构混合物,其比例显示出取决于芳族取代基的电子性质。也可以使用2,3-二氨基吡啶,其对二氢[3,2 - b ]吡啶并吡嗪-2-酮异构体表现出优异的选择性。