The Suzuki−Miyaura cross-coupling of aryl phosphates using Ni(PCy3)2Cl2 as an inexpensive, bench-stable catalyst is described. Broad substrate scope and high efficiency are demonstrated by the syntheses of more than 40 biaryls and by constructing complex organic molecules. The poor reactivity of aryl phosphates relative to aryl halides is successfully employed to construct polyarenes by selective cross-coupling
An ethericNegishicoupling: The first cross‐coupling reaction between aryl alkyl ethers and dianion‐type zincate reagents to afford biaryl compounds through selective cleavage of the ethericC(sp2)O bond was developed. Dianion‐type zincates showed excellent reactivity toward the aromatic ethersundermildconditions, with good functional group compatibility (see scheme).
Bimetallic Ni–Pd Synergism—Mixed Metal Catalysis of the Mizoroki-Heck Reaction and the Suzuki–Miyaura Coupling of Aryl Bromides
作者:Abhijit A. Kashid、Dharmaraj J. Patil、Ramling D. Mali、Vijay P. Patil、T. V. Neethu、Heena K. Meroliya、Shobha A. Waghmode、Suresh Iyer
DOI:10.1007/s10562-020-03330-9
日期:2021.2
thermal Mizoroki-Heck reaction and Suzuki coupling giving high yields in short reaction times. A thermal redox mechanism probably occurs whereby Ni complex transfers electron and reduces the Pd (II) to Pd (0) which then takes the reactants through the standard protocol of oxidative-addition, migratoryinsertion and reductive elimination, typical for the Mizoroki-Heck reaction and the Suzuki coupling
Pd 和 Ni 配合物的组合激活了芳基溴化物,用于热 Mizoroki-Heck 反应和 Suzuki 偶联,在短反应时间内获得高产率。可能会发生热氧化还原机制,Ni 配合物转移电子并将 Pd (II) 还原为 Pd (0),然后将反应物带入氧化加成、迁移插入和还原消除的标准方案,这在 Mizoroki-Heck 反应中很典型和铃木联轴器。
Ni-Catalyzed Cross-Coupling of Dimethyl Aryl Amines with Arylboronic Esters under Reductive Conditions
作者:Zhi-Chao Cao、Si-Jun Xie、Huayi Fang、Zhang-Jie Shi
DOI:10.1021/jacs.8b08779
日期:2018.10.24
Herein, we reported a successful Suzuki-Miyaura coupling of dimethyl aryl amines to forge biaryl skeleton via Ni catalysis in the absence of directing groups and preactivation. This transformation proceeded with high efficiency in the presence of magnesium. Preliminary mechanism studies demonstrated dual roles of magnesium: (i) a reductant that reduced Ni(II) species to active Ni(I) catalyst; (ii)