Phosphonium-mediated cyclization of N-(2-aminophenyl)thioureas: efficient synthesis of 2-aminobenzimidazoles
作者:Zhao-Kui Wan、Erena Farah Ousman、Nikolaos Papaioannou、Eddine Saiah
DOI:10.1016/j.tetlet.2011.05.146
日期:2011.8
BOP efficiently promoted the phosphonium-mediated cyclization of thioureas, leading to a convenient synthesis of 2-aminobenzimidazoles. Compared to conventional methods, the reactions were complete at room temperature with times ranging from a few minutes to 1 h in near quantitative yields. This method is also applicable to the synthesis of more challenging structures such as 2-akylaminobenzimidazoles
BOP有效地促进了promote介导的硫脲的环化,从而导致了2-氨基苯并咪唑的方便合成。与常规方法相比,反应在室温下以几分钟到1小时的时间完成,收率接近定量。该方法也可用于合成更具挑战性的结构,例如2-烷基氨基苯并咪唑和2-(N-酰基)-氨基苯并咪唑。本文所述的方法学是制备各种2-氨基苯并咪唑的温和而有效的途径。