Synthesis of 2-trifluoromethyl benzimidazoles, benzoxazoles, and benzothiazoles <i>via</i> condensation of diamines or amino(thio)phenols with CF<sub>3</sub>CN
作者:Bo Lin、Yunfei Yao、Minze Wu、Lu Qin、Shouxiong Chen、Yi You、Zhiqiang Weng
DOI:10.1039/d3ob00517h
日期:——
method is developed for the synthesis of 2-trifluoromethyl benzimidazoles, benzoxazoles, and benzothiazoles in good to excellent yields by the condensation of diamines or amino(thio)phenols with in situ generated CF3CN. Additionally, the synthetic utility of the 2-trifluoromethyl benzimidazole and benzoxazole products is demonstrated via gram scale synthesis. The mechanistic study suggests that the reaction
通过二胺或氨基(硫代)酚与原位生成的 CF 3 CN 的缩合,开发了一种新的有效方法,以良好至极好的收率合成 2-三氟甲基苯并咪唑、苯并恶唑和苯并噻唑。此外,通过克级合成证明了 2-三氟甲基苯并咪唑和苯并恶唑产品的合成效用。机理研究表明,该反应通过三氟乙腈与二胺衍生物的氨基进行亲核加成反应,形成亚胺中间体,然后进行分子内环化。