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)。
Directed Palladium-Catalyzed
Oxidative C-H Arylation of (Hetero)arenes with Arylboronic
Acids by Using TEMPO
作者:Armido Studer、Sylvia Kirchberg、Thomas Vogler
DOI:10.1055/s-0028-1083546
日期:——
Oxidative coupling of three different arenes and a thiophene derivative with various arylboronicacids with Pd(OAc) 2 and the commercially available 2,2,6,6-tetramethylpiperidine-N-oxyl radical (TEMPO) as an oxidant are reported. A 2-pyridyl group on the substrates serves as ortho-directing group to mediate the C-H arylation. Mechanistic studies are provided.
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
Ru-catalyzed aerobic oxidative coupling of arylboronic acids with arenes
作者:Hong Li、Wei Wei、Yuan Xu、Chao Zhang、Xiaobing Wan
DOI:10.1039/c0cc04322b
日期:——
A Ru-catalyzedoxidativecoupling of arenes with boronic acids using molecular oxygen via direct C-H activation is reported. Both the scope and the mechanism of the process are discussed.