Condensation of thiourea derivatives with carbonyl compounds: one-pot synthesis of N-alkyl-1,3-thiazol-2-amines and of 3-alkyl-1,3-thiazolimines
作者:Carla Boga、Luciano Forlani、Cristian Silvestroni、Anna Bonamartini Corradi、Paolo Sgarabotto
DOI:10.1039/a809086f
日期:——
The reactions of ketones and N-substituted thioureas, in the presence of HCl (or HBr) and DMSO afford mixtures of the title compounds which are easily separated on a silica gel column. This method avoids the classical use of α-haloketones. The mechanism of these reactions involves the enolization of ketones and the activation of thiourea sulfur, probably by oxygen transfer from DMSO.
在HCl(或HBr)和DMSO的存在下,酮与N-取代的硫脲的反应提供了易于在硅胶柱上分离的标题化合物的混合物。该方法避免了传统的α-卤代酮的使用。这些反应的机理可能涉及酮的烯化和硫脲硫的活化,这可能是通过从DMSO转移氧来实现的。