Palladium-Catalyzed Coupling of Polyfluorinated Arenes with Heteroarenes via C–F/C–H Activation
摘要:
The first palladium-catalyzed coupling of 2-pyrldyl-polyfluoroarenes and benzoxazole, thiazole, benzothiazole, benzoimidazole, oxazole or oxadiazole via a concurrent C-F/C-H activation is described. Initial mechanistic studies showed that C-F activation of perfluoroarene is likely the rate-limiting step of the catalytic cycle. This protocol provides a useful and operationally simple process to functionalized polyfluoroarenes.
An ortho‐selective CF bond borylation betweenN‐heterocycle‐substituted polyfluoroarenes and Bpin‐Bpin with simple and commercially available [Rh(cod)2]BF4 as a catalyst is now reported. The reaction proceeds under mild reaction conditions with high efficiency and broad substrate scope, even toward monofluoroarene, thus providing a facile access to a wide range of borylated fluoroarenes that are useful
邻选择性Ç 的N-杂环取代的polyfluoroarenes和BPIN-BPIN用简单的和可商购的间F键硼化的[Rh(COD)2 ] BF 4现在报告作为催化剂。该反应在温和的反应条件下以高效率和宽泛的底物范围进行,甚至朝单氟芳烃进行,因此可以轻松地获得各种对光电子材料有用的硼化氟代芳烃。初步的机理研究表明,通过关键中间体氢化铑(III)络合物[(H)Rh III L n(Bpin)]的Rh III / V催化循环可能参与了反应。
Quantitative Four-State Conformational Analysis by Ring Current NMR Anisotropy: A Family of Molecules Capable of Intramolecularπ-Stacking
作者:Jing Chen、Arthur Cammers-Goodwin
DOI:10.1002/ejoc.200300302
日期:2003.10
A novel, multi-state, conformationalanalysis based on the magnetic anisotropy of molecules undergoing fast dynamic exchange is described. Calculated chemical shift tensors combined with experimental data from proton NMR studies were used to quantify conformational distributions as a function of solvent and temperature for a hydrocarbon and two fluorocarbon derivatives of N,N-[1,3-phenylenebis(met
Exploration of the Scope of Pt-Catalyzed C-F Activation
作者:Lauren Keyes、Alex D. Sun、Jennifer A. Love
DOI:10.1002/ejoc.201100478
日期:2011.7
fluorides, which have potential utility as building blocks for the synthesis of pharmaceuticals and materials. We report herein efforts to expand the scope of these processes, particularly the choice of directing group. Comparisons to the previously reported scope of PtII-catalyzed methylation and methoxylation are described.
PdF: A simple catalytic system, broad substrate scope, and high versatility provide a useful and facileaccess to partiallyfluorinatedaromatics (see scheme). Tuning the reaction conditions enables a diverse range of product structures to be prepared.
Nickel-catalyzed reductive cross-coupling of polyfluoroarenes with alkyl electrophiles by site-selective C–F bond activation
作者:Longlong Xi、Liting Du、Zhuangzhi Shi
DOI:10.1016/j.cclet.2022.01.077
日期:2022.9
A nickel-catalyzed reductive cross-coupling reactions between polyfluoroarenes and alkyl electrophiles is reported to access substituted fluoroarenes through chelation-assisted C–F activation. Diverse primary and secondary alkyl (pseudo)halides can be employed to couple with polyfluoroarenes, showing excellent regioselectivity. Furthermore, the nickel-catalyzed asymmetric cross-coupling of polyfluoroarenes