An operationally simple visible light mediated intramolecular cyclization of benzimidazole to 2-amino benzimidazole hybrid. The disclosed procedure is rapid and the convenient synthesis of benzimidazole–amine hybrids from easily available substituted cyclic, acyclic amines, and benzimidazole under neat conditions in the presence of catalyst tris(2,2-bipyridine)ruthenium(II) chloride. Indubitably this methodology gives a facile and straightforward pathway to construct benzimidazole–amine hybrid derivatives in an eco-friendly fashion. The reaction proved to be economical interims of product yield, low loading of catalyst under solvent free condition. The solvent free method has supreme importance in industrial research. The scope and efficiency of this new green method is significantly better than the existing methods.

中文翻译：

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环保策略：通过可见光产生的苯并am胺的氧化CH-H芳基化反应，设计和合成具有生物效价的苯并咪唑-胺杂化物

操作简单的可见光介导的苯并咪唑向2-氨基苯并咪唑杂化体的分子内环化。所公开的方法是快速的，并且在催化剂三（2,2-联吡啶）钌（II）存在下，在纯净条件下，由易获得的取代的环状，无环胺和苯并咪唑可以方便地合成苯并咪唑-胺杂化物。毋庸置疑，这种方法学以一种生态友好的方式为构建苯并咪唑-胺杂化衍生物提供了简便而直接的途径。该反应被证明是产物收率的经济中间产物，在无溶剂条件下催化剂的低载量。无溶剂方法在工业研究中具有极其重要的意义。这种新的绿色方法的范围和效率明显优于现有方法。