A one-pot procedure for the conversion of aromatic and heteroaromatic 2-nitroamines into bicyclic 2H-benzimidazoles is described. The procedure employs formic acid, iron powder, and an additive such as NH4Cl to reduce the nitro group and effect the imidazole cyclization with high-yielding conversions generally within one to two hours. The compatibility with a wide range of functionality demonstrates the general utility of this procedure.
描述了一种将芳香和杂芳香2-
硝基胺转化为双环
2H-苯并咪唑的一锅法步骤。该步骤采用
甲酸、
铁粉以及NH4Cl等添加剂来还原硝基并实现
咪唑环化,通常在一到两小时内完成高产率的转化。其广泛的官能团兼容性显示了该步骤的普遍实用性。