One-pot synthesis of multisubstituted imidazoles catalyzed by Dendrimer-PWAn nanoparticles under solvent-free conditions and ultrasonic irradiation
作者:Mohsen Esmaeilpour、Jaber Javidi、Farzaneh Dehghani、Saeed Zahmatkesh
DOI:10.1007/s11164-016-2613-9
日期:2017.1
efficient, green and eco-friendly protocol has been developed for the synthesis of 2,4,5-trisubstituted and 1,2,4,5-tetrasubstituted imidazoles via one-pot condensation reaction using Dendrimer-PWAn as catalyst under solvent-free conditions or ultrasonic irradiation in excellent yields. The reactions under conventional heating conditions were compared with the ultrasonic-assisted reactions. The operational
已开发出一种有效,绿色环保的方案,用于通过使用Dendrimer-PWA n的一锅缩合反应合成2,4,5-三取代和1,2,4,5-四取代的咪唑在无溶剂条件下或作为超声波辐射的催化剂时,产率很高。将常规加热条件下的反应与超声辅助反应进行了比较。该协议的操作简便性,实用性和适用性使其适用于各种底物,使其成为以前程序的有趣替代品。本方法提供了许多优点,例如优异的产率,较短的反应时间,更清洁的反应以及没有任何繁琐的后处理或纯化。催化剂易于通过过滤从产物中分离出来,并且还表现出显着的可重复使用的活性。在每个反应循环后,还研究了催化剂的SEM,BET和DLS。