A green and practical reduction of N-(4-chlorophenyl)-2-nitroaniline and its derivatives to corresponding N-substituted-benzene-1,2-diamines using thiourea dioxide
作者:Cong-Shan Zhong、Jian-Lan Cui、Si-Yuan Yu、Xiao Wang、Ning Wang
DOI:10.1016/j.tetlet.2020.151599
日期:2020.3
A new effective approach for synthesizing diverse N-substituted-benzene-1,2-diamines is reported. The treatment of N-substituted-2-nitroanilines with thiourea dioxide in the presence of sodium hydroxide efficiently formed the corresponding N-substituted-benzene-1,2-diamines, including N-(4-chlorophenyl)benzene-1,2-diamine with a good yield of 94%. The by-product is environmentally-friendly urea and is easy to separate from the product by filtration procedure that enhances the convenience of the approach. (C) 2020 Elsevier Ltd. All rights reserved.