使用环糊精 (CD) 作为添加剂开发了芳香族化合物的区域选择性自由基 C-H 三氟甲基化。C-H三氟甲基化以高区域选择性进行,以良好的收率提供产品,即使是克级规模。在 CD 存在的情况下,一些底物选择性地进行单三氟甲基化,而在没有 CD 的情况下形成单三氟甲基化产物和双三氟甲基化产物的混合物。1 H NMR 实验表明区域选择性是通过在 CD 腔内包含基底来控制的。
PhI(OAc)2-mediated oxidative trifluoromethylation of arenes with CF3SiMe3 under metal-free conditions
作者:Xinyue Wu、Lingling Chu、Feng-Ling Qing
DOI:10.1016/j.tetlet.2012.11.011
日期:2013.1
A PhI(OAc)2-mediated oxidative trifluoromethylation of arenes with CF3SiMe3 under metal-free conditions has been described. This protocol precludes the need of substrate pre-functionalization and metal catalysts, enabling a direct access to a series of trifluoromethylated arenes and heterocycles containing common functional groups in moderate and good yields.