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。
Metal-Free, Initiator-Free Graphene Oxide-Catalyzed Trifluoromethylation of Arenes
作者:Jingyu Zhang、Yun Yang、Jingxian Fang、Guo-Jun Deng、Hang Gong
DOI:10.1002/asia.201700939
日期:2017.10.5
The direct C−H trifluoromethylation of arenes catalyzed by graphene oxide (GO) under safe conditions is described. This strategy is metal‐free, initiator‐free, safe, and scalable. It employs a readily available CF3 source and the reaction can be easily controlled to obtain a mono‐trifluorinated product. This method opens a new avenue for GO‐catalyzed chemistry.
An efficient and environmentally benign electrochemical oxidative radical C—H trifluoromethylation of arenes by employing Langlois reagent as the CF3 source was developed in this work. Neither transition metal catalysts nor external chemical oxidants were required in this trifluoromethylation process. The reaction could be conducted in gram scale with high reaction efficiency.
Catalyst-free direct C–H trifluoromethylation of arenes in water–acetonitrile
作者:Dangui Wang、Guo-Jun Deng、Shiya Chen、Hang Gong
DOI:10.1039/c6gc02000c
日期:——
An efficient, practical, catalyst-free direct C–H trifluoromethylation of arenes using readily available and inexpensive CF3SO2Na as a CF3-source in water–acetonitrile is described.
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.