Exploration of copper and amine-free Sonogashira cross coupling reactions of 2-halo-3-alkyl imidazo[4,5-b]pyridines using tetrabutyl ammonium acetate as an activator under microwave enhanced conditions
作者:Ayyiliath M. Sajith、A. Muralidharan
DOI:10.1016/j.tetlet.2012.07.028
日期:2012.9
shown as an appropriate way of performing the copper-free Sonogashira reaction. In this paper, we report PdCl2(PCy3)2 as an efficient catalyst for the copper and amine-free Sonogashira cross coupling reactions of 2-halo-3-alkyl imidazo[4,5-b]pyridines (I, Br, Cl) using tetrabutyl ammonium acetate as an activator under microwave enhanced conditions.
通过使用具有空间需求和富电子配体的钯催化剂来提高催化体系的反应性,通常已被证明是进行无铜Sonogashira反应的合适方法。在本文中,我们报告了PdCl 2(PCy 3)2作为2-卤代-3-烷基咪唑并[4,5- b ]吡啶(I,Br, Cl)在微波增强条件下使用乙酸四丁铵作为活化剂。