strategy for aromatic trifluoromethylation by converting amino into trifluoromethyl groups via a Sandmeyer-type reaction is reported. The transformation involves diazotization of the aromatic amines with tert-butyl nitrite and hydrochloric acid to form aryldiazonium chlorides, followed by trifluoromethylation with trifluoromethylsilver at low temperature. Various readily available aromatic amines are
A highly efficient Rh-catalyzed carbenoid addition to trifluoromethylthioether for the formation of trifluoromethyl-substituted sulfonium ylide is described. The trifluoromethyl-substituted sulfonium ylide can act as an electrophilic trifluoromethylation reagent, as demonstrated by trifluoromethylation of β-ketoesters and aryl iodides.
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.
Rapid and Efficient Trifluoromethylation of Aromatic and Heteroaromatic Compounds Using Potassium Trifluoroacetate Enabled by a Flow System
作者:Mao Chen、Stephen L. Buchwald
DOI:10.1002/anie.201306094
日期:2013.10.25
Going to the source: The trifluoromethylation of aryl/heteroaryl iodides has been demonstrated using a flowsystem, thus enabling a rapid rate of reaction. A broad spectrum of trifluoromethylated compounds was prepared in good to excellent yields using CF3CO2K as the trifluoromethyl source. The process has the advantage of short reaction times and uses convenient [CF3] sources.
追根溯源:芳基/杂芳基碘化物的三氟甲基化已被证明使用流动系统,从而实现快速反应。使用 CF 3 CO 2 K 作为三氟甲基源,以良好到极好的收率制备了广谱的三氟甲基化化合物。该方法具有反应时间短的优点并使用方便的[CF 3 ]源。
External‐Oxidant‐Free Electrochemical Oxidative Trifluoromethylation of Arenes Using CF
<sub>3</sub>
SO
<sub>2</sub>
Na as the CF
<sub>3</sub>
Source
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.