cross-dehydrogenative coupling (CDC) reaction is an efficient strategy for indole synthesis. However, most CDC methods require special substrates, and the presence of inherent groups limits the versatility for further transformation. A carboxylic acid-promoted aerobic catalytic system is developed herein for a single-step synthesis of indoles from simple anilines and ketones. This versatile system is featured
A facile synthesis of 2-substituted indoles from (2-aminobenzyl)triphenylphosphonium salts
作者:Shin'ichi Taira、Hiroshi Danjo、Tsuneo Imamoto
DOI:10.1016/s0040-4039(02)00460-4
日期:2002.4
A variety of 2-substituted 1-acylindoles were obtained in yields ranging from 40 to 94% by intramolecular Wittig reaction employing (2-aminobenzyl)triphenylphosphonium derivatives and acid anhydride in the presence of triethylamine. The reaction of (2-aminobenzyl)phosphonium derivatives with various acyl chlorides in 2,6-lutidine also proceeded to give the corresponding indoles in 28–67% yields.