describes the chemoselective coupling of polyfluoroarenes with aryl germanes in the presence of aromatic C-I, C-Br, C-Cl, C-OTf and C-SiMe3 groups, as well as demonstrates the further downstream diversification to give richly functionalized and highly fluorinated polyarenes. The strategy relies on an in situ Umpolung of the FnArH, followed by selective Au(I)/Au(III)-catalyzed coupling with electron-poor or
Photoredox/Nickel Dual-Catalyzed Reductive Cross Coupling of Aryl Halides Using an Organic Reducing Agent
作者:Abhishek Dewanji、Raoul F. Bülow、Magnus Rueping
DOI:10.1021/acs.orglett.0c00199
日期:2020.2.21
cross-coupling of polyfluorinated arenes with a broad range of aryl halides has been developed. Sequential carbon-fluorine bond cleavage and carbon-carbonbondformation are two of the important features of the reaction. Addition of an arylradical anion to a nickel intermediate was achieved for the first time using polyfluoroarenes as radical precursors. This, in combination with the excellent para selectivity
Metal-Free Perfluoroarylation by Visible Light Photoredox Catalysis
作者:Andreas U. Meyer、Tomáš Slanina、Chang-Jiang Yao、Burkhard König
DOI:10.1021/acscatal.5b02410
日期:2016.1.4
Visiblelight and eosin Y catalyze the direct arylation of simple arenes with fluorinated aryl bromides by a photoredox process. The reaction scope is broad in fluorinated compounds and arenes and the general and simple procedure provides a metal-free alternative for the synthesis of synthetically valuable polyfluorinated biaryl structures. The mild reaction conditions allow a selective reaction with
Pd(OAc)2-catalyzed cross-coupling of polyfluoroarenes with simple aromatics in imidazolium ionic liquids (ILs) without oxidant and additive and with recycling/reuse of the IL
作者:Rajesh G. Kalkhambkar、Kenneth K. Laali
DOI:10.1016/j.tetlet.2011.08.077
日期:2011.10
for an oxidant and an additive. The reaction is catalyzed by HOAc and it is subject to a primaryisotopeeffect (KH/KD = 4.87). Competitive cross-coupling reactions of 1,2,4,5-tetrafluorobenzene with benzene/toluene, benzene/anisole, and anisole/toluene gave KB/KT = 5.1, KB/KA = 5.7, and KA/KT = 5.0, respectively, indicative of a remote substituent effect on Pd insertion into the phenyl C–H bond. Mild
通过使用溶解在咪唑类ILs [(bmim)PF 6和(bmim)BF 4 ]中的Pd(OAc)2,可以使聚氟芳烃与简单的芳族化合物(苯,甲苯和苯甲醚)交叉偶联,分离效果好。不需要氧化剂和添加剂。该反应被HOAc催化,并受到主要的同位素作用(K H / K D = 4.87)。1,2,4,5-四氟苯与苯/甲苯,苯/苯甲醚和苯甲醚/甲苯的竞争性交叉偶联反应得出K B / K T = 5.1,K B / K A = 5.7和KA / K T = 5.0,分别表明对Pd插入苯基C–H键的远程取代基作用。温和的反应条件,简单的产物分离以及IL的回收/再利用是该方法的其他优势。
Transition-Metal-Free Synthesis of Fluorinated Arenes from Perfluorinated Arenes Coupled with Grignard Reagents
作者:Yunqiang Sun、Hongjian Sun、Jiong Jia、Aiqin Du、Xiaoyan Li
DOI:10.1021/om4011609
日期:2014.2.24
A simple method to obtain organofluorine compounds from perfluorinated arenes coupled with Grignard reagents in the absence of a transition-metal catalyst was reported. In particular, the perfluorinated arenes could react not only with aryl Grignard reagents but also with alkyl Grignard reagents in moderate to good yields.