Nickel(II)/Salox-Catalyzed Enantioselective C–H Functionalization

IF 12.7 1区 化学 Q1 CHEMISTRY, MULTIDISCIPLINARY
Jia-Hao Chen, Qi-Jun Yao, Ming-Yu Zhong, Tian-Yu Jiang, Fan-Rui Huang, Xiang Li and Bing-Feng Shi*, 
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引用次数: 0

Abstract

Recently, nickel catalysts have garnered considerable attention for their efficacy and versatility in asymmetric catalysis, attributed to their distinctive properties. However, the use of cost-effective and sustainable divalent nickel catalysts in C–H activation/asymmetric alkene insertion poses significant challenges due to the intricate control of stereochemistry in the transformation of the tetracoordinate C–Ni(II) intermediate. Herein, we report a Ni(II)-catalyzed enantioselective C–H/N–H annulation with oxabicyclic alkenes. This protocol offers straightforward access to chiral [2,2,1]-bridged bicyclic compounds bearing four consecutive stereocenters with high enantioselectivity (up to 96% ee). The development of a sterically hindered chiral salicyloxazoline (Salox) ligand, TMS-Salox, is key to the success of this protocol. Mechanistic investigations unveiled that a chiral Ni(III)-metalacyclic intermediate was formed through the in situ oxidation of achiral organometallic Ni(II) species and coordination of the Salox ligand. This process led to the creation of a tailored chiral pocket that guides the approach of alkenes, thereby influencing and determining the stereochemistry.

Ni(II)-catalyzed enantioselective C−H/N−H annulation with oxabicyclic alkenes using a sterically hindered chiral salicyloxazoline (Salox) ligand, TMS-Salox, was reported.

镍(II)/萨罗克斯催化的对映选择性C-H功能化
近年来,镍催化剂因其独特的性能在不对称催化中的功效和多功能性而受到广泛关注。然而,由于在四配位C-Ni (II)中间体的转化过程中需要复杂的立体化学控制,因此在C-H活化/不对称烯烃插入中使用具有成本效益和可持续性的二价镍催化剂面临重大挑战。在这里,我们报道了一个Ni(II)催化的对映选择性的C-H / N-H环与杂环烯烃。该方案提供了直接的手性[2,2,1]桥接双环化合物,具有四个连续的立体中心,具有高对映选择性(高达96% ee)。位阻手性水杨酸氯唑啉(Salox)配体TMS-Salox的开发是该方案成功的关键。机理研究表明,手性Ni(III)-金属环中间体是通过非手性有机金属Ni(II)的原位氧化和Salox配体的配位形成的。这一过程导致了一个定制的手性口袋的产生,该口袋可以引导烯烃的接近,从而影响和确定立体化学。报道了ni (II)催化的对映选择性C - H/N - H环与无环烯烃使用位阻手性水杨基恶唑啉(Salox)配体,TMS-Salox。
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来源期刊
ACS Central Science
ACS Central Science Chemical Engineering-General Chemical Engineering
CiteScore
25.50
自引率
0.50%
发文量
194
审稿时长
10 weeks
期刊介绍: ACS Central Science publishes significant primary reports on research in chemistry and allied fields where chemical approaches are pivotal. As the first fully open-access journal by the American Chemical Society, it covers compelling and important contributions to the broad chemistry and scientific community. "Central science," a term popularized nearly 40 years ago, emphasizes chemistry's central role in connecting physical and life sciences, and fundamental sciences with applied disciplines like medicine and engineering. The journal focuses on exceptional quality articles, addressing advances in fundamental chemistry and interdisciplinary research.
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