提出了通过使用芳基三氟硼酸钾有效地一锅合成邻芳基化的2-苯基吡啶和吡啶衍生物。最佳反应条件如下:在10摩尔%的乙酸钯(II),三当量的乙酸铜(II)和两当量的乙酸铜存在下,用2.5当量的芳基三氟硼酸钾处理2-苯基吡啶或吡啶衍生物。对苯醌在1,4-二恶烷中的溶液在120°C下保持24小时。对苯醌是在金属转移-还原消除步骤中的重要助氧化剂。动力学同位素效应(k H / k D对于CH键的活化确定为1.09。这表明在速率确定步骤中没有发生CH键断裂。 CH官能化-三氟硼酸钾-钯催化剂-芳基化-吡啶
Palladium-Catalyzed Decarboxylative Arylation of C−H Bonds by Aryl Acylperoxides
作者:Wing-Yiu Yu、Wing Nga Sit、Zhongyuan Zhou、Albert S.-C. Chan
DOI:10.1021/ol900756g
日期:2009.8.6
bond was developed using aryl acylperoxides as inexpensive aryl sources. Substrates containing pyridyl, oxime, and oxazoline groups undergo effectively ortho-selective C−H arylation with excellent functional group tolerance. This arylation should begin by directing-group-assisted cyclopalladation, followed by the reaction of the palladacycle with aryl radicals generated in situ by thermal decomposition
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
Palladium-Catalyzed Direct Monoarylation of Aryl C−H Bonds with Iodoarenes
作者:Li Su、Dong-Dong Guo、Bin Li、Shi-Huan Guo、Gao-Fei Pan、Ya-Ru Gao、Yong-Qiang Wang
DOI:10.1002/cctc.201700138
日期:2017.6.8
transition-metal-catalyzed direct arylation of nonactivated aryl C−Hbonds with iodoarenes has emerged as an important method for the construction of biaryls. Generally, the direct arylation reaction proceeds in the presence of stoichiometric Ag additives; moreover, the diarylation product is often unavoidable if there are two identical aromatic C−Hbonds in the substrate. Herein we disclose an efficient Pd(
过渡金属催化的未活化芳基CH键与碘代芳烃的直接芳基化已成为构建联芳基的重要方法。通常,直接芳基化反应在化学计量的Ag添加剂的存在下进行;优选地,在室温下进行。此外,如果在底物中存在两个相同的芳族CH键,则通常不可避免地存在二芳基化产物。在这里,我们公开了一种有效的Pd(OAc)2 /三氟乙酸/ O 2催化体系,该体系在无银条件下促进各种芳族CH键与各种碘代芳烃的直接芳基化反应。偶联反应具有完全的单芳基化选择性。这种方法为联芳烃提供了一种简单,便捷且经济的途径。
Rhodium-Catalyzed Oxidative C−H Arylation of 2-Arylpyridine Derivatives via Decarbonylation of Aromatic Aldehydes
作者:Qi Shuai、Luo Yang、Xiangyu Guo、Olivier Baslé、Chao-Jun Li
DOI:10.1021/ja105396b
日期:2010.9.8
A new concept for aryl aryl coupling that involves oxidative decarbonylative coupling of aryl C-H bonds and readily available aldehydes has been developed, achieving the aryl-aryl union with complete control of reaction sites.
Palladium(II)-Catalyzed ortho Arylation of 2-Phenylpyridines with Potassium Aryltrifluoroborates by C-H Functionalization
作者:Ming-Jung Wu、Jean-Ho Chu、Shiang-Lin Tsai
DOI:10.1055/s-0029-1217014
日期:2009.11
4-dioxane at 120 ˚C for 24 hours. p-Benzoquinone is an important co-oxidant in the transmetalation-reductive elimination step. The kinetic isotope effect (k H/k D) for the C-H bond activation was determined to be 1.09. It indicates that the C-H bond cleavage does not occur in the rate-determining step. C-H functionalization - potassium trifluoroborate - palladium catalyst - arylations - pyridines
提出了通过使用芳基三氟硼酸钾有效地一锅合成邻芳基化的2-苯基吡啶和吡啶衍生物。最佳反应条件如下:在10摩尔%的乙酸钯(II),三当量的乙酸铜(II)和两当量的乙酸铜存在下,用2.5当量的芳基三氟硼酸钾处理2-苯基吡啶或吡啶衍生物。对苯醌在1,4-二恶烷中的溶液在120°C下保持24小时。对苯醌是在金属转移-还原消除步骤中的重要助氧化剂。动力学同位素效应(k H / k D对于CH键的活化确定为1.09。这表明在速率确定步骤中没有发生CH键断裂。 CH官能化-三氟硼酸钾-钯催化剂-芳基化-吡啶