Electrophotocatalytic Undirected C−H Trifluoromethylations of (Het)Arenes
作者:Youai Qiu、Alexej Scheremetjew、Lars H. Finger、Lutz Ackermann
DOI:10.1002/chem.201905774
日期:2020.3.12
enabled arene C-H trifluoromethylation with the Langlois reagent CF3SO2Na under mild reaction conditions. The merger of electrosynthesis and photoredox catalysis provided a chemical oxidant-free approach for the generation of the CF3 radical. The electrophotochemistry was carried out in an operationally simple manner, setting the stage for challenging C-H trifluoromethylations of unactivated arenes
电化学使芳烃 CH 在温和的反应条件下用郎格鲁瓦试剂 CF3 SO2 Na 发生三氟甲基化。电合成和光氧化还原催化的结合为CF3自由基的产生提供了一种无化学氧化剂的方法。电化学光化学以操作简单的方式进行,为挑战未活化芳烃和杂芳烃的CH三氟甲基化奠定了基础。电化学流形的鲁棒性反映在广泛的范围内,包括富电子和缺电子的苯,以及天然存在的杂芳烃。电光化学CH三氟甲基化进一步通过配备有用于在线流式NMR光谱的操作中监控单元的模块化电流动池在流动中实现,为单电子转移过程提供支持。
In Situ Generation of PhI<sup>+</sup>
CF<sub>3</sub>
and Transition-Metal-Free Oxidative sp<sup>2</sup>
CH Trifluoromethylation
作者:Cong Xu、Jingxin Liu、Wenbo Ming、Yingjie Liu、Jun Liu、Mang Wang、Qun Liu
DOI:10.1002/chem.201301585
日期:2013.7.8
to tri us: The introduction of CF3 units into organic molecules is important and requires the development of convenient trifluoromethylating reagents. Here, PhI+CF3, an acyclic electrophilic “CF3+” species, is described, including its in situ generation from TMSCF3, PhI(OAc)2, and KF and its direct applications in sp2 CH trifluoromethylations under mild transition‐metal‐free conditions (see scheme)
straightforward and selective introduction of such groups into (hetero)arenes using available and less expensive sources is still a major challenge. In this regard, the selective synthesis of various trifluoromethyl‐substituted (hetero)arenes by palladium‐catalyzed C−Hfunctionalization is herein reported. This novel methodology proceeds under comparably mild reaction conditions with good regio‐ and chemoselectivity
A methodology for the photocatalyzed radical trifluoromethylation of indoles: A combined experimental and computational study
作者:Shelli A. Miller、Bas van Beek、Trevor A. Hamlin、F. Matthias Bickelhaupt、Nicholas E. Leadbeater
DOI:10.1016/j.jfluchem.2018.08.005
日期:2018.10
introduction of the trifluoromethylgroup on to indole scaffolds is presented. The procedure involves the use of sodium trifluoromethylsulfinate (Langlois reagent) as the source of the trifluoromethyl radical, and is performed photochemically with 2-tert-butylanthraquinone as a photocatalyst. The reaction has also been probed computationally. Reaction kinetics and molecularorbital analyses from our