An Unprecedented and Concise Method for the Synthesis of 1,3-Thiazino-[3,4a][1,3]benzimidazoles via a Three-Component Reaction
作者:Abdolali Alizadeh、Zohreh Noaparast、Hamideh Sabahnoo、Nasrin Zohreh
DOI:10.1055/s-0029-1219934
日期:2010.6
For the first time, a novel, simple, and highly efficient synthesis of N-aryl-N-[1,3]thiazino[3,4a][1,3]benzimidazol-1-ylidenamines is presented. The one-pot reaction of o-phenylenediamine, aryl isothiocyanate, and methyl acetylenecarboxylate proceeds in toluene-dichloromethane without any catalyst under reflux conditions to produce the title compounds in 60-70% yield. From a mechanistic point of view, the reaction is proposed to occur via two cyclizations and four heteroatom-carbon bond formations.
首次提出了一种新颖、简单且高效的 N-芳基-N-[1,3]噻嗪[3,4a][1,3]苯并咪唑-1-亚基胺的合成方法。邻苯二胺、异硫氰酸芳基酯和乙炔甲酸甲酯在甲苯-二氯甲烷中、无任何催化剂、回流条件下进行一锅反应,得到标题化合物,收率60-70%。从机理的角度来看,该反应被认为是通过两次环化和四个杂原子-碳键形成而发生的。