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
Room-Temperature Chromium(II)-Catalyzed Direct Arylation of Pyridines, Aryl Oxazolines, and Imines Using Arylmagnesium Reagents
作者:Olesya M. Kuzmina、Paul Knochel
DOI:10.1021/ol502623v
日期:2014.10.3
We report a CrCl2 catalyzed oxidative arylation of various pyridines, aryl oxazolines, and aryl imines using aromatic Grignard reagent in the presence of 2,3-dichlor-obutane (DCB). Most of the reaction proceed rapidly at 25 degrees C and do not require any additional ligand Benzo[h] quinoline, 2-arylpyridine, aryl oxazoline, and imines were successfully arylated in good yields under these conditions. A TMS-substituent was used to prevent double arylation. After oxidative cross-coupling the TMS-group was further converted to a second ortho-aryl substituent. Remarkably, inexpensive aryl N-butylimine derivatives are excellent substrate for this oxidative arylation.