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.
Green and Eco-Friendly Synthesis of Quinoxalines by Brönsted Acidic Ionic Liquid Supported on Nano-SiO<sub>2</sub> under Solvent-Free Conditions
using a reusablecatalyst for the synthesis of these heterocyclic compounds is highly desirable. At the same time, there is an ongoing demand for the development of green and ecofriendly methods in organic synthesis. Due to the favorable properties of ionicliquids, such as high polarity, high thermal and chemical stability, non-flammability and low vapor pressure, the application of ionicliquids as green