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。
A new route to 2-(trifluoromethyl)benzimidazoles is described which involves the condensation of (2-arylamino)iminophosphoranes with trifluoroacetyl esters or trifluoroacetic anhydride. The method allows the synthesis of the title compounds from simple nitroarenes without the use of separate reduction steps and metallic reagents or expensive catalysts.
Simple Synthesis of 2-Aminoaryliminophosphoranes from N-Aryl-2-nitrosoanilines and Their Application in 2-Aminobenzimidazole Synthesis
作者:Zbigniew Wróbel、Emilia Łukasik
DOI:10.1055/s-0033-1340055
日期:——
Condensation of N-aryl-2-nitrosoanilines with triphenylphosphine leads efficiently to substituted aryliminophosphoranes which, in turn, react with alkyl isocyanates furnishing 2-alkylaminobenzimidazole derivatives in high yields.
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 from2-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 fromsimple 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。
2-(Arylamino)aryliminophosphoranes as Easily Available and Convenient Starting Materials in the Synthesis of 1,2,3-Benzotriazoles
作者:Zbigniew Wróbel、Emilia Łukasik
DOI:10.1055/s-0034-1378448
日期:——
1-Aryl-1,2,3-benzotriazole systems are synthesized in the high-yielding cyclocondensation of 2-(arylamino)aryliminophosphoranes under mild conditions. The reaction concludes the three-step, halogen-free synthetic route starting from simple nitroarenes and arylamines.