Elemental sulfur-promoted one-pot synthesis of 2-(2,2,2-trifluoroethyl)benzoxazoles and their derivatives
作者:Zhengyu Li、Jingnan Dong、Junwen Wang、Ding-Yah Yang、Zhiqiang Weng
DOI:10.1039/c9cc06822h
日期:——
A novel and direct strategy has been developed for the synthesis of 2-(2,2,2-trifluoroethyl)benzoxazoles by reaction of o-aminophenols and 2-bromo-3,3,3-trifluoropropene in the presence of elemental sulfur under metal-free conditions. The scope of this methodology was further extended to the synthesis of the trifluoroethylated benzothiazole and benzoimidazole derivatives. A plausible mechanism was
已经开发了一种新颖的直接策略,用于在金属下在元素硫存在下通过邻氨基酚与2-溴-3,3,3-三氟丙烯反应生成2-(2,2,2-三氟乙基)苯并恶唑。无条件。该方法的范围进一步扩展到三氟乙基化苯并噻唑和苯并咪唑衍生物的合成。在硫代酰胺中间体的分离和表征的基础上,提出了一种合理的机理。