A Readily Accessible Class of Chiral Cp Ligands and their Application in Ru
<sup>II</sup>
‐Catalyzed Enantioselective Syntheses of Dihydrobenzoindoles
作者:Shou‐Guo Wang、Sung Hwan Park、Nicolai Cramer
DOI:10.1002/anie.201802244
日期:2018.5.4
Chiral cyclopentadienyl (Cpx) ligands have a large application potential in enantioselective transition‐metal catalysis. However, the development of concise and practical routes to such ligands remains in its infancy. We present a convenient and efficient two‐step synthesis of a novel class of chiral Cpx ligands with tunable steric properties that can be readily used for complexation, giving CpxRhI
手性环戊二烯(Cp x)配体在对映选择性过渡金属催化中具有巨大的应用潜力。但是,开发这种配体的简洁实用的方法仍处于起步阶段。我们提出了一种方便有效的两步合成具有可调空间特性的新型手性Cp x配体的方法,可以很容易地用于络合,得到Cp x Rh I,Cp x Ir I和Cp x Ru II复合体。后者在用炔烃对氮杂苯并降冰片二烯进行对映选择性环化中得到了证明,后者可提供高达98:2 er的二氢苯并吲哚,显着优于现有的由双萘基衍生的Cp x配体。
Oxa- and Azabenzonorbornadienes as Electrophilic Partners under Photoredox/Nickel Dual Catalysis
作者:Youran Luo、Álvaro Gutiérrez-Bonet、Jennifer K. Matsui、Madeline E. Rotella、Ryan Dykstra、Osvaldo Gutierrez、Gary A. Molander
DOI:10.1021/acscatal.9b02458
日期:2019.9.6
into photoredox/nickel dual catalysis in a regioselective and diastereoselective transformation is disclosed. The inherent advantages of this dual catalytic system allow the use of alkyl motifs forming exclusively cis-1,2-dihydro-1-naphthyl alcohol backbones using readily accessible 4-alkyl-1,4-dihydropyridines (DHPs). Whereas previous studies have emphasized the use of nucleophilic organometallic coupling
Enantioselective Iridium-Catalyzed Ring Opening of Low-Activity Azabenzonorbornadienes with Amines
作者:Ren shi Luo、Gengjinsheng Cheng、Yifei Wei、Rinuan Deng、Miao Huang、Jianhua Liao
DOI:10.1021/acs.organomet.8b00239
日期:2018.6.11
generated in situ from [Ir(coe)2Cl]2 and a nitrogen phosphorus ligand was efficient in the asymmetric ring-opening reactions of low-activity azabenzonorbornadiene with various aliphatic and aromatic amines, providing the corresponding chiral vicinal 1,2-diamine scaffolds in high yields (up to 98%) and excellent enantioselectivities (up to 97% ee). The synthetic utility of the transformation was demonstrated
The ruthenium(II)-catalyzed direct ring-opening reaction of 7-azabenzonorbornadienes with anilides via C–H activation to access hydronaphthylamines has been developed. The transformation proceeds with a high stereoselectivity to give cis-configuration products under redox-neutral conditions.
Iron-catalysed enantioselective carbometalation of azabicycloalkenes
作者:Laksmikanta Adak、Masayoshi Jin、Shota Saito、Tatsuya Kawabata、Takuma Itoh、Shingo Ito、Akhilesh K. Sharma、Nicholas J. Gower、Paul Cogswell、Jan Geldsetzer、Hikaru Takaya、Katsuhiro Isozaki、Masaharu Nakamura
DOI:10.1039/d1cc02387j
日期:——
carbometalation reaction of azabicycloalkenes has been achieved by iron catalysis to in situ form opticallyactive organozinc intermediates, which are amenable to further synthetic elaborations. The observed chiral induction, along with the DFT and XAS analyses, reveals the direct coordination of the chiral phosphine ligand to the iron centre during the carbon–carbon and carbon–metal bond forming step. This
氮杂双环烯烃的第一个对映选择性碳金属化反应是通过铁催化实现的,原位形成光学活性有机锌中间体,可以进一步合成。观察到的手性诱导以及 DFT 和 XAS 分析揭示了在碳-碳和碳-金属键形成步骤中手性膦配体与铁中心的直接配位。这种新型铁催化的不对称反应将有助于生物活性分子的合成和生产。