Aryliminophosphoranes as Key Intermediates in the One-Pot Synthesis of 1-Aryl-1,3-dihydro-2H-benzimidazol-2-ones from N-Aryl-2-nitrosoanilines and Carbon Dioxide under Mild Metal-Free Conditions
作者:Zbigniew Wróbel、Emilia Łukasik
DOI:10.1055/s-0035-1561301
日期:——
environmentally friendly. A new and convenient protocol is presented for the synthesis of 1-arylbenzimidazol-2-ones by a one-pot reaction of N-aryl-2-nitrosoanilines using solid carbon dioxide as a source of the key carbonyl moiety. The metal-free process is carried out under mild conditions and is compatible with a variety of substituents. The atom economy of the synthesis of the starting nitrosoanilines
Simple Synthesis of N-Aryl-2-nitrosoanilines in the Reaction of Nitroarenes with Aniline Anion Derivatives
作者:Zbigniew Wróbel、Andrzej Kwast
DOI:10.1055/s-0030-1258230
日期:2010.11
Anions generated from primary arylamines react with substituted nitrobenzenes to form ÏH-adducts, which, under basic reaction conditions, undergo transformation to N-aryl-2-nitrosoamines. Competitive substitution of reactive halogens in the nitroarenes, which is observed in certain cases, can be controlled by the solvent selected.
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。
A two-step oxidative aromatic substitution of hydrogen as a convenient way to 2-nitrodiarylamines
A method for the synthesis of differently substituted 2-nitrodiarylamines via nucleophilic substitution of hydrogen in nitroarenes is described. In the two-step procedure, the first step omits classical substitution of halogens in starting nitroarenes and occurs efficiently at the position ortho to the activating group. Subsequent oxidation of the 2-nitrosoanilines so formed is accomplished with a
2-Nitroso-<i>N</i>-arylanilines: Products of Acid-Promoted Transformation of σ<sup>H</sup> Adducts of Arylamines and Nitroarenes
作者:Zbigniew Wróbel、Andrzej Kwast
DOI:10.1055/s-2007-982534
日期:2007.6
Anions generated from arylamines react with substituted nitrobenzenes to form ÏH adducts, which, under protonation with acetic acid, undergo transformation to 2-nitroso-N-arylamines, susceptible to reduction, condensation and cyclization reactions.