描述了一种新的铑催化的苯并[ h ]喹啉-10-羧酸乙酯与有机硼化合物的脱羰偶联反应,该反应通过螯合辅助的sp 2 C-COOEt键活化而发生。在该系统中,CuCl发挥了非常重要的作用,并且五元罗丹环也作为关键中间体参与其中。在反应中各种官能团是相容的,并且以良好至优异的产率获得了所需的产物。还已经使用Rh(I)模型催化剂对该反应机理进行了DFT计算。
Efficient rhodium(I)-catalyzed regioselective direct arylation and alkenylation of aromatic C−H bonds has been realized with aromatic carboxylic and cinnamic anhydrides as the coupling partners via decarbonylation and C−H activation under phosphine-free conditions.
Rhodium/N-Heterocyclic Carbene Catalyzed Direct Intermolecular Arylation of sp<sup>2</sup>and sp<sup>3</sup>CH Bonds with Chelation Assistance
作者:Min Kim、Jaesung Kwak、Sukbok Chang
DOI:10.1002/anie.200903500
日期:2009.11.9
chelation‐assisted direct intermolecular arylation using an N‐heterocyclic carbene and phosphine ligands (see scheme; IMes=1,3‐bis(2,4,6‐trimethylphenyl)imidazol‐2‐ylidene). The reaction is operationally simple, proceeds under mild reaction conditions to afford mono‐ or diarylated products in excellent yields, and is applicable to the arylation at the sp3 or sp2CH bonds of 2‐pyridyl‐containing aryl, vinyl
Direct Cross-Coupling of CH Bonds with Grignard Reagents through Cobalt Catalysis
作者:Bin Li、Zhen-Hua Wu、Yi-Fan Gu、Chang-Liang Sun、Bai-Quan Wang、Zhang-Jie Shi
DOI:10.1002/anie.201005394
日期:2011.2.1
Go go Grignard! The first highly regioselective, cobalt‐catalyzed CH transformation of benzo[h]quinoline and phenylpyridine derivatives with Grignardreagents at room temperature has been achieved (see scheme). Both aryl and alkyl Grignardreagents showed significant reactivity.
快去格利雅(Grignard)!在室温下,使用格氏试剂首次实现了对苯并[ h ]喹啉和苯基吡啶衍生物的高区域选择性,钴催化的CH转化(参见方案)。芳基和烷基格氏试剂均显示出显着的反应性。
Expeditious and Solvent-Free Nickel-Catalyzed C−H Arylation of Arenes and Indoles
作者:Rahul A. Jagtap、Vineeta Soni、Benudhar Punji
DOI:10.1002/cssc.201700321
日期:2017.5.22
nickel‐catalyzed method for C−Hbond arylation of arenes and indoles has been developed, which proceeds expeditiously through chelation assistance. The reaction is highly selective for mono‐arylation and tolerates sensitive and structurally diverse functionalities, such as halides, ethers, amines, indole, pyrrole and carbazole. This reaction represents the first example of a nickel‐catalyzed C−H arylation by monochelate
Catalytic and Highly Regioselective Cross-Coupling of Aromatic C−H Substrates
作者:Kami L. Hull、Melanie S. Sanford
DOI:10.1021/ja074395z
日期:2007.10.1
This communication describes a new Pd-catalyzed reaction for the highly chemo- and regioselective oxidative cross-coupling of aromatic C-H bonds. This transformation is proposed to proceed via two discrete C-H activation steps whose selectivities are predominantly controlled by proximity to a ligand (first C-H activation) or by the steric environment around the arene C-H bond (second C-H activation). Furthermore, the selectivity of the second C-H activation reaction can be controlled by tuning the ligand environment around the Pd center.