A New Approach to the Synthesis of 1-Arylbenzimidazole-2-thiones from Nitroarenes and Anilines through Halogen-Free Substitution of Hydrogen via Iminophosphorane Intermediates
作者:Zbigniew Wróbel、Emilia Łukasik
DOI:10.1055/s-0035-1560639
日期:——
well as reduction processes required for the synthesis of the intermediate diamines. 2-(Arylamino)phenyliminophosphoranes, formed directly from 2-nitrosodiarylamines, undergo a high-yielding cyclocondensation with CS2, providing a variety of 1-arylbenzimidazole-2-thiones. The reaction concludes a new synthetic route leading to the title compounds from simple nitroarenes and arylamines. The protocol is
摘要 直接由2-亚硝基二芳基胺形成的2-(芳氨基)苯基亚氨基正膦酸酯与CS 2进行高产率的环缩合,提供各种1-芳基苯并咪唑-2-硫酮。反应结束了一条新的合成路线,由简单的硝基芳烃和芳基胺制得标题化合物。该方案优于使用N-芳基亚芳基二胺的常规方法,因为它省略了邻卤代硝基芳烃中卤素原子的S N Ar取代以及中间体二胺合成所需的还原过程。 直接由2-亚硝基二芳基胺形成的2-(芳氨基)苯基亚氨基正膦酸酯与CS 2进行高产率的环缩合,提供各种1-芳基苯并咪唑-2-硫酮。反应结束了一条新的合成路线,由简单的硝基芳烃和芳基胺制得标题化合物。该方案优于使用N-芳基亚芳基二胺的常规方法,因为它省略了邻卤代硝基芳烃中卤素原子的S N Ar取代以及中间体二胺合成所需的还原过程。