Convenient Synthesis of Unsymmetrical N,N′-disubstituted Thioureas in Water
作者:Zhengyi Li、Yuan Chen、Yue Yin、Zhiming Wang、Xiaoqiang Sun
DOI:10.3184/174751916x14760947474916
日期:2016.11
and convenient two-step method has been developed and used to synthesise 25 (4 of which are novel) unsymmetrical N,N′-disubstituted thioureas in water. Alkylamines or variously substituted arylamines reacted smoothly with phenyl chlorothionoformate at room temperature to form thiocarbamates, which were then reacted with another alkyl- or arylamine in water at reflux to afford the unsymmetrical N,N′-disubstituted
working very well not only for alkyl and electron-rich aryl isothiocyanates, but also for highly electron-deficient aryl and heterocyclic isothiocyanates. A facile and efficient synthesis of isothiocyanatesfromamines is described. This method involves the reaction of amines with phenyl chlorothionoformate in the presence of solid sodium hydroxide by either a one-pot process or a two-step approach. The