Zeolite imidazolate framework Co-ZIF-67 was synthesized and utilized as a recyclable catalyst for the synthesis of benzimidazoles via the cascade redox condensation of 2-nitroanilines with benzylamines without added oxidizing or reducing agents. The Co-ZIF-67 catalyst expressed better performance in the generation of benzimidazoles than many MOFs and many conventional homogeneous catalysts. The transformation progressed via genuinely heterogeneous catalysis, and the formation of benzimidazoles via homogeneous catalysis due to the leaching phenomenon, if any, was not considerable. The cobalt-based framework catalyst could be reutilized many times for the reaction without losing its efficiency. The fact that the cascade redox condensation could proceed readily with a recyclable catalyst while additional reducing or oxidizing agents were not required would outperform previous synthetic protocols. To the best of our knowledge, this is the first heterogeneous catalytic approach to achieve benzimidazoles via the cascade redox condensation of 2-nitroanilines with benzylamines.

合成了咪唑啉沸石骨架Co-ZIF-67，并通过2-硝基苯胺与苄胺的级联氧化还原缩合反应用作合成苯并咪唑的可循环催化剂，而无需添加氧化剂或还原剂。Co-ZIF-67催化剂在苯并咪唑的生成中表现出比许多MOF和许多常规均相催化剂更好的性能。转化是通过真正的多相催化进行的，并且由于浸出现象（如果有的话），通过均相催化形成苯并咪唑并不重要。钴基骨架催化剂可多次重复使用以进行反应，而不会损失其效率。级联氧化还原缩合反应可以很容易地用可循环利用的催化剂进行，而无需另外的还原剂或氧化剂的事实将胜过以前的合成方案。据我们所知，这是第一种通过2-硝基苯胺与苄胺的级联氧化还原缩合反应获得苯并咪唑的非均相催化方法。