Ligand‐Enabled Nickel‐Catalyzed Redox‐Relay Migratory Hydroarylation of Alkenes with Arylborons
作者:Yuli He、Chuang Liu、Lei Yu、Shaolin Zhu
DOI:10.1002/anie.202001742
日期:2020.6.2
A redox-relay migratory hydroarylation of isomeric mixtures of olefins with arylboronic acids catalyzed by nickel complexes bearing diamine ligands is described. A range of structurally diverse 1,1-diarylalkanes, including those containing a 1,1-diarylated quaternary carbon, were obtained in excellent yields and with high regioselectivity. Preliminary experimental evidence supports the proposed non-dissociated
powerful approach toward the functionalization of C–H bonds remote to a functional group. Whereas various Pd-catalyzed migratory cross-couplings have been developed in the past years, the design of an efficient migratory version of the popular Suzuki–Miyaura cross-coupling has remained elusive. The current article reports a one-pot procedure consisting of alkene hydroboration and migratory Suzuki–Miyaura
ligand-controlled nickel migration/arylation. This general protocol allows the use of abundant and bench-stable alkyl bromides and aryl bromides for the synthesis of a wide range of structurally diverse 1,1-diarylalkanes in excellent yields and high regioselectivities under mild conditions. We also demonstrated that alkyl bromide could be replaced by the proposed olefin intermediate while using n-propyl bromide/Mn0
Migratory Reductive Acylation between Alkyl Halides or Alkenes and Alkyl Carboxylic Acids by Nickel Catalysis
作者:Jun He、Peihong Song、Xianfeng Xu、Shaolin Zhu、You Wang
DOI:10.1021/acscatal.9b00521
日期:2019.4.5
cross-coupling has been achieved through NiH-catalyzed chainwalking and subsequent cross-coupling from two abundant starting materials, alkyl bromides, and carboxylicacids. This strategy allows the direct acylation of the benzylic sp3 C–H bond with high yield as a single regioisomer. As an alternative, the alkyl bromide could be replaced by the proposed olefin intermediate and commercially available n-PrBr
is challenging, especially in asymmetric transformations. With each step in the catalytic cycle promoted by its privileged ligand and different steps well-connected by dynamic ligand exchange, synergistic combination of multiple ligands could potentially enhance the catalytic efficiency and selectivity. Now, this concept has been applied to the NiH-catalyzed asymmetric remote hydroacylation of olefins