A straightforward method has been developed for the synthesis of the benzimidazole ring system through a carbon-nitrogen cross-coupling reaction. In the presence of 2.0 equiv. of K2CO3 in water at 100 °C for 30 h, the intramolecular cyclization of N-(2-iodoaryl)benzamidine provides benzimidazole derivatives in moderate to high yields. Remarkably, the procedure occurs exclusively in water and doesn’t require the use of any additional reagent/catalyst, rendering the methodology highly valuable from both environmental and economical points of view.
通过碳氮交叉偶联反应合成
苯并咪唑环系统的直接方法已经开发出来。在 2.0 等量的 K2CO3 存在下,于 100 °C 的
水中反应 30 小时,N-(2-
碘芳基)
苯甲脒的分子内环化反应可提供中等至高产率的
苯并咪唑衍
生物。值得注意的是,该过程完全在
水中进行,不需要使用任何额外的试剂/催化剂,因此从环保和经济的角度来看,该方法都具有很高的价值。