Palladium-Catalyzed Direct <i>Ortho</i> C–H Arylation of 2-Arylpyridine Derivatives with Aryltrimethoxysilane
作者:Wu Li、Zhangwei Yin、Xiaoqing Jiang、Peipei Sun
DOI:10.1021/jo2016168
日期:2011.10.21
A Pd(OAc)2-catalyzed cross-coupling reaction between 2-arylpyridine and aryltrimethoxysilane in the presence of AgF and BQ in 1,4-dioxane was studied. After various reaction parameters (catalyst, oxidant, additive, solvent and reaction temperature) were examined, the optimal conditions for the reaction were identified. The synthesis is compatible to aryltrimethoxysilane with both electron-withdrawing
研究了在1,4-二恶烷中,在AgF和BQ存在下,Pd(OAc)2催化2-芳基吡啶与芳基三甲氧基硅烷之间的交叉偶联反应。在检查了各种反应参数(催化剂,氧化剂,添加剂,溶剂和反应温度)后,确定了反应的最佳条件。该合成与芳基三甲氧基硅烷在芳基部分上具有吸电子基团和给电子基团两者相容,且产率适中。提供了C–H键活化的动力学同位素效应(k H / k D)。
Palladium-Catalyzed C–H Bond Functionalization Reactions Using Phosphate/Sulfonate Hypervalent Iodine Reagents
simple approach for palladium-catalyzed C–H functionalization reactions utilizing an organophosphorus/sulfonate hypervalent iodine reagent as both an oxidant and the source of a functional group has been developed. Through this method, the oxidative phosphorylation-, sulfonation-, and hydroxylation of unactivated benzyl C(sp3)–H bonds, along with the hydroxylation and arylation of aryl C(sp2)–H bonds,
An iron-catalyzed C-C bond formation reaction of a nitrogen-containing aromatic compound with an arylzinc reagent takes place at 0 degrees C in a good to quantitative yield. The reaction involves a C-Hbondactivationdirected by a neighboring nitrogen atom. The important additives in this reaction are 1,10-phenanthroline, tetramethylethylenediamine, and 1,2-dichloro-2-methylpropane, in the absence
含氮芳族化合物与芳基锌试剂的铁催化 CC 键形成反应在 0 摄氏度下以良好的定量产率发生。该反应涉及由相邻氮原子引导的 CH 键活化。该反应中的重要添加剂是 1,10-菲咯啉、四甲基乙二胺和 1,2-二氯-2-甲基丙烷,在没有它们的情况下观察到非常低的产物收率。
Palladium(II)-Catalyzed Oxidative ortho-Arylation of 2-Phenylpyridines
作者:Chun Cai、Jie Feng、Guoping Lu、Meifang Lv
DOI:10.1055/s-0033-1339516
日期:——
A palladium(II)-catalyzedoxidative ortho-arylation of 2-phenylpyridines via direct C–H activation with aryl boric acids is described. The reaction could be conducted under mild conditions in the presence of Pd(OAc)2/Cu(OTf)2/TBHP system, and a variety of the azacyclic compounds bearing a biaryl unit were obtained with moderate to good yields.
描述了钯 (II) 催化的 2-苯基吡啶氧化邻位芳基化反应,通过使用芳基硼酸直接进行 C-H 活化。在Pd(OAc)2/Cu(OTf)2/TBHP体系存在下,该反应可以在温和的条件下进行,并以中等至良好的收率获得了多种带有联芳基单元的氮杂环化合物。
Ruthenium(<scp>ii</scp>)-catalyzed ortho-C–H arylation of diverse N-heterocycles with aryl silanes by exploiting solvent-controlled N-coordination
作者:Pradeep Nareddy、Frank Jordan、Michal Szostak
DOI:10.1039/c7ob00818j
日期:——
We report the first method for the direct, regioselectiveRu(II)-catalyzed oxidative arylation of C–H bonds in diverse N-heterocycles with aryl silanes by exploiting solvent-controlled N-coordination. The reaction takes advantage of the attractive features of organosilanes as coupling partners, providing proof of concept for N-directed Ru(II)-catalyzed C–H arylation. This novel, operationally-simple