Nickel-Catalyzed Enantioselective Cross-Coupling of N-Hydroxyphthalimide Esters with Vinyl Bromides
摘要:
An enantioselective Ni-catalyzed cross-coupling of NT-hyciroxyphthalimide esters with Vinyl bromides is reported. The reaction proceeds under mild conditions and uses tetralds(N,N-dimethylamino)ethylene as a terminal organic reductant. Good functional group tolerance is demonstrated, with over 20 examples of reactions that proceed with >90% ee.
Nickel-Catalyzed Asymmetric Reductive Cross-Coupling Between Vinyl and Benzyl Electrophiles
作者:Alan H. Cherney、Sarah E. Reisman
DOI:10.1021/ja508067c
日期:2014.10.15
between vinyl bromides and benzyl chlorides has been developed. This method provides direct access to enantioenriched products bearing aryl-substituted tertiary allylic stereogenic centers from simple, stable starting materials. A broad substrate scope is achieved under mild reaction conditions that preclude the pregeneration of organometallic reagents and the regioselectivity issues commonly associated with
已开发出一种 Ni 催化的溴乙烯和苄基氯之间的不对称还原交叉偶联。该方法提供了从简单、稳定的起始材料直接获得带有芳基取代的叔烯丙基立体中心的对映体富集的产品。在温和的反应条件下实现了广泛的底物范围,排除了有机金属试剂的预生成和通常与不对称烯丙基芳基化相关的区域选择性问题。
Stereo- and Enantioselective Benzylic C–H Alkenylation via Photoredox/Nickel Dual Catalysis
作者:Xiaokai Cheng、Tongtong Li、Yuting Liu、Zhan Lu
DOI:10.1021/acscatal.1c02851
日期:2021.9.3
molecules undergo this cross-coupling reaction smoothly to afford chiral allylic compounds in up to 93% ee and >20/1 E/Z ratio under mild reaction conditions with good functional group tolerance. A triplet-energy-transfer-inhibiting strategy is developed for the stereoselective synthesis of alkenes under visible-lightphotocatalysis. The coordination pattern of nickel with chiral bis-imidazoline ligand has
报道了通过光氧化还原/镍催化的立体和对映选择性苄基 C-H 烯基化。容易获得的烷基苯和烯基溴化物,包括复杂的分子,在温和的反应条件下顺利地进行这种交叉偶联反应,以提供高达 93% ee 和 >20/1 E / Z比的手性烯丙基化合物,具有良好的官能团耐受性。开发了一种三重态能量转移抑制策略,用于在可见光光催化下立体选择性合成烯烃。基于非线性效应实验和 X 射线衍射,阐明了镍与手性双咪唑啉配体的配位模式。
Further Application of an N-Ar Axially Chiral Mimetic-Type Ligand: Asymmetric Grignard Cross-Coupling Reaction
A novel chiral ligand mimicking N-Ar axial chirality, (S)-N-[2-(diphenylphosphanyl)naphthalen-1-yl]-2-(piperidinylmethyl)piperidine, was found to exhibit good enantioselectivity (up to 80% ee) in the asymmetric cross-coupling reaction of 1-phenylethylmagnesium chloride with β-bromostyrene derivatives. Additionally, this type ligand is appealing, because it allows the synthesis of a wide variety of analogues.
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
Nickel/Photoredox-Catalyzed Enantioselective Reductive Cross-Coupling between Vinyl Bromides and Benzyl Chlorides
作者:Qianqian Lu、Haixing Guan、Yan-En Wang、Dan Xiong、Tingzhi Lin、Fei Xue、Jianyou Mao
DOI:10.1021/acs.joc.2c00707
日期:2022.6.17
visible-light-promoted nickel/photoredox-catalyzed reductive cross-coupling reaction between vinylbromides and benzyl chlorides is reported. A diverse array of enantioenriched allylic centers containing products could be achieved in good yields (up to 90%) and high enantioselectivities (up to 95% ee). The mechanistic studies show that this reductive cross-coupling involves a radical pathway.