Using CO₂ as a low-cost C1 resource to produce value-add products was considered as a promising strategy for the sustainable carbon cycle. Herein, a base-promoted reductive functionalization of CO₂ and 1,2-phenylenediamine for the synthesis of benzimidazole was developed using hydrosilane as an H-donor. Commercially available acetate salt CH₃COOK used as a budget catalyst could furnish various benzimidazoles with moderate to excellent yields (42-95%) under mild conditions (40 °C, 1 bar CO₂). The reaction mechanism undergoing cascade N-formylation, cyclization, and reduction was preliminarily confirmed by attenuated total reflection (ATR) technique and control experiments.

使用CO ₂作为低成本C1资源生产增值产品被认为是可持续碳循环的一种有前途的策略。在此，使用氢化硅烷作为氢供体，开发了碱促进的用于合成苯并咪唑的CO ₂和1,2-苯二胺的还原性官能化。用作廉价催化剂的市售乙酸盐CH ₃ COOK可以在温和条件下（40°C，1 bar CO ₂）以中等至优异的收率（42-95％）提供各种苯并咪唑。通过衰减全反射（ATR）技术和对照实验初步确定了发生级联N-甲酰化，环化和还原的反应机理。