An “all-water” strategy for regiocontrolled synthesis of 2-aryl quinoxalines
作者:Babita Tanwar、Priyank Purohit、Banothu Naga Raju、Dinesh Kumar、Damodara N. Kommi、Asit K. Chakraborti
DOI:10.1039/c4ra16568c
日期:——
CascadeN-aroylmethylation–reduction–condensation process as novel strategy of “all water chemistry” for first generalized regioselective synthesis of 2-aryl quinoxalines.
A catalyst free, one pot approach for the synthesis of quinoxaline derivatives via oxidative cyclisation of 1,2-diamines and phenacyl bromides
作者:Kapil Kumar、Sagar Ravso Mudshinge、Sandeep Goyal、Mukesh Gangar、Vipin A. Nair
DOI:10.1016/j.tetlet.2015.01.138
日期:2015.3
A simple, efficient and eco-friendly method has been developed for quinoxaline synthesis from inexpensive and readily available diamines and phenacyl bromides by catalyst- and additive-free protocol.
An efficient one-pot synthesis of 2-substituted quinoxalines from 1,2-diamines and phenacyl bromides is developed using K10-montmorillonite (K10 clay) as a catalyst at 50 degrees C in acetonitrile medium. This method offers an easy route for the synthesis of substituted quinoxalines in high yields. A plausible mechanism is proposed in which quinoxalines are formed via dehydration-dehydrohalogenationcyclization sequence. Further, the K10 clay catalyst is recovered by simple filtration and reused six times without any loss in its catalytic activity. (C) 2014 Elsevier Ltd. All rights reserved.