Simple Synthesis of 2-Aminoaryliminophosphoranes from N-Aryl-2-nitrosoanilines and Their Application in 2-Aminobenzimidazole Synthesis
摘要:
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.
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.
(2-Aminoaryl)iminophosphoranes as Versatile Starting Materials for the Synthesis of 1-Aryl-2-trifluoromethylbenzimidazoles
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.