Asymmetric synthesis<i>via</i>stereospecific C–N and C–O bond activation of alkyl amine and alcohol derivatives
作者:Sarah M. Pound、Mary P. Watson
DOI:10.1039/c8cc07093h
日期:——
electrophiles for stereospecific, nickel-catalyzed cross-coupling reactions, as well as the prior art that inspired our efforts. The success of our effort has relied on the use of benzyl ammonium triflates as electrophiles for cross-couplings via C–Nbondactivation and benzylic and allylic carboxylates for cross-couplings via C–O bondactivation. Our work, along with others’ exciting discoveries, has demonstrated
Enantioselective Reductive
<scp>Cross‐Coupling</scp>
of Aryl/Alkenyl Bromides with Benzylic Chlorides
<i>via</i>
Photoredox/Biimidazoline Nickel Dual Catalysis
作者:Tongtong Li、Xiaokai Cheng、Jiamin Lu、Huifeng Wang、Qun Fang、Zhan Lu
DOI:10.1002/cjoc.202100819
日期:2022.5
The asymmetric reductive arylation and alkenylation of benzylic chloride under photoredox/nickel dual catalysis using chiral biimidazoline (BiIm) ligand is reported to access 1,1-diaryl alkanes and aryl allylic compounds with good yield as well as stereo- and enantioselectivities. This protocol uses more commercially available and less expensive C(sp2)-Br as the electrophile coupling partner. A primary
Traceless Directing Group for Stereospecific Nickel-Catalyzed Alkyl−Alkyl Cross-Coupling Reactions
作者:Margaret A. Greene、Ivelina M. Yonova、Florence J. Williams、Elizabeth R. Jarvo
DOI:10.1021/ol300891k
日期:2012.8.17
Stereospecific nickel-catalyzed cross-couplingreactions of benzylic 2-methoxyethyl ethers are reported for the preparation of enantioenriched 1,1-diarylethanes. The 2-methoxyethyl ether serves as a traceless directing group that accelerates cross-coupling. Chelation of magnesium ions is proposed to activate the benzylic C–O bond for oxidative addition.
Nickel-Catalyzed Regiodivergent Reductive Hydroarylation of Styrenes
作者:Yuli He、Shaolin Zhu、Yuhang Xue、Jian Chen、Peihong Song
DOI:10.1055/a-1523-3228
日期:2021.10
We report a ligand-controlled nickel-catalyzed reductive hydroarylation of styrenes with predictable and controllable regioselectivity. With a diamine ligand, the reaction produces selective linear hydroarylation products. Alternatively, with a chiral PyrOx ligand, branch-selective enantioenriched 1,1-diarylalkane products are obtained. Preliminary mechanistic results are consistent with a reductive
Nickel-Catalyzed Cross-Couplings of Benzylic Pivalates with Arylboroxines: Stereospecific Formation of Diarylalkanes and Triarylmethanes
作者:Qi Zhou、Harathi D. Srinivas、Srimoyee Dasgupta、Mary P. Watson
DOI:10.1021/ja312087x
日期:2013.3.6
We have developed a stereospecific nickel-catalyzed cross-coupling of benzylic pivalates with arylboroxines. The success of this reaction relies on the use of Ni(cod)(2) as the catalyst and NaOMe as a uniquely effective base. This reaction has broad scope with respect to the arylboroxine and benzylic pivalate, enabling the synthesis of a variety of diarylalkanes and triarylmethanes in good to excellent yields and ee's.