An Expedient New Synthesis of Substituted Carbazoles via α-Oxoketene Acetals through Heteroaromatic Annelation Methodology
作者:Pranab K Patra、J.R Suresh、H Ila、H Junjappa*
DOI:10.1016/s0040-4039(97)00560-1
日期:1997.4
A new general method for substituted carbazoles 4a-x has been developed involving base induced conjugate addition-elimination sequence of indole-3-acetonitriles 1 to various α-oxoketene S,S-,O,S- and N,S-acetals 2a-x followed by cyclization of the intermediates 3 with p-toluenesulfonic acid in refluxing benzene. © 1997 Published by Elsevier Science Ltd.
已开发出一种新的取代咔唑4a-x的通用方法,涉及将吲哚-3-乙腈1与各种α-氧杂环丁烯S,S-,O,S-和N,S-缩醛2a-进行碱基诱导的共轭加成-消除序列。x,然后用对甲苯磺酸在回流的苯中环化中间体3。©1997由Elsevier Science Ltd发布。