作者:Jairo Quiroga、Ernesto Mata、Jaime Portilla、Rodrigo Abonía、Braulio Insuasty、Manuel Nogueras、Justo Cobo
DOI:10.1055/s-2008-1032030
日期:2008.2
The facile solution and solid-phase synthesis of 1-pyrazol-3-ylbenzimidazoles from 4-fluoro-3-nitrobenzoate derivatives and 5(3)-amino-3(5)-subtituted-1 H-pyrazoles is reported. The key step is the unexpected nucleophilic aromatic displacement of the activated fluorine by the exocyclic amino group of the pyrazole ring leading to 4-pyrazolylamino-3-nitrobenzoate derivatives, which are easily converted
报道了从 4-fluoro-3-nitrobenzoate 衍生物和 5(3)-amino-3(5)-submitted-1 H-pyrazoles 轻松溶液和固相合成 1-pyrazol-3-ylbenzimidazoles。关键步骤是活化的氟被吡唑环的环外氨基意外亲核芳族置换,产生 4-吡唑基氨基-3-硝基苯甲酸酯衍生物,这些衍生物很容易在非常高的条件下转化为相应的 1-吡唑-3-基苯并咪唑。孤立的产量。这些新方法对于生成苯并咪唑的各种 1-杂芳基衍生物库非常有用。