Catalytic C−C Bond Formation Accomplished by Selective C−F Activation of Perfluorinated Arenes
摘要:
The first example of a catalytically active system for Suzuki-type cross-coupling reactions of perfluorinated arenes such as octafluorotoluene and decafluorobiphenyl is presented.
Copper-Catalyzed Direct C–H Oxidative Trifluoromethylation of Heteroarenes
作者:Lingling Chu、Feng-Ling Qing
DOI:10.1021/ja209992w
日期:2012.1.18
This article describes the copper-catalyzed oxidative trifluoromethylation of heteroarenes and highly electron-deficient arenes with CF(3)SiMe(3) through directC-H activation. In the presence of catalyst Cu(OAc)(2), ligand 1,10-phenanthroline and cobases tert-BuONa/NaOAc, oxidative trifluoromethylation of 1,3,4-oxadiazoles with CF(3)SiMe(3) proceeded smoothly using either air or di-tert-butyl peroxide
activation of fluorinatedalkenes and arenes was developed. In this Pd-catalyzed Suzuki–Miyaura-type cross-coupling reaction, neither a base for enhancing the reactivity of the organoboron reagents nor a Lewis acid for promoting C–F bond activation was required. A fluoropalladium intermediate played an essential role in this reaction. In addition, a Ni(NHC) catalyst was efficient for C–C coupling through
Palladium-Catalyzed Coupling Reaction of Perfluoroarenes with Diarylzinc Compounds
作者:Masato Ohashi、Ryohei Doi、Sensuke Ogoshi
DOI:10.1002/chem.201303451
日期:2014.2.10
to promote the oxidative addition of one CF bond of C6F6 to palladium. Stoichiometric reactions revealed that an expected oxidative‐addition product, trans‐[Pd(C6F5)I(PCy3)2], generated from the reaction of [Pd(PCy3)2] with C6F6 in the presence of lithium iodide, was not involved in the catalytic cycle. Instead, a transient three‐coordinate, monophosphine‐ligated species, [Pd(C6F5)I(PCy3)], emerged
该报告描述了六氟苯(C 6 F 6)与二芳基锌化合物的首次Pd 0催化交叉偶联,得到了多种五氟苯基芳烃。该反应可以应用于其他全氟芳烃,例如八氟甲苯,五氟吡啶和全氟萘,以得到相应的多氟偶联产物。在该催化反应中的最佳配体是PCy 3,碘化锂作为偶联反应的添加剂是必不可少的。碘化锂在该催化反应中的作用之一是促进C 6 F 6的一个CF键的氧化加成。钯。化学计量反应表明,在存在条件下,[Pd(PCy 3)2 ]与C 6 F 6的反应产生了预期的氧化加成产物反式[Pd(C 6 F 5)I(PCy 3)2 ]。碘化锂的一部分不参与催化循环。取而代之的是,瞬态三配位单膦连接的物质[Pd(C 6 F 5)I(PCy 3)]出现为催化循环中的潜在中间体。因此,我们分离了一种新型的Pd II复合物[Pd(C 6 F 5)I(PCy3)(py)],其中吡啶(py)充当不稳定的配体以生成瞬态物质。实际上,在碘化锂的存在下,发现该Pd
Palladium-Catalyzed Direct Arylation of Polyfluoroarenes with Organosilicon Reagents
作者:Huixin Fan、Yaping Shang、Weiping Su
DOI:10.1002/ejoc.201402091
日期:2014.6
The palladium-catalyzeddirectarylation of polyfluoroarenes with organosiliconreagents was achieved by establishing general reaction conditions. This protocol was compatible with a broad range of functional groups and offered the desired products in moderate to good yields.
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。