对映选择合成
催化作用
镍
化学
组分(热力学)
组合化学
联轴节(管道)
序列(生物学)
立体异构
立体化学
有机化学
材料科学
物理
热力学
生物化学
冶金
作者
Zhan Dong,Changyu Xu,Jianchao Chang,Sitian Zhou,Peipei Sun,Yuqiang Li,Liang‐An Chen
标识
DOI:10.1021/acscatal.4c00477
摘要
Asymmetric reductive three-component arylalkylation of alkenes via the radical relay method has been well established, while asymmetric arylalkylation via the migratory insertion strategy remains unexplored. We report enantioselective nickel-catalyzed cross-electrophile arylalkylation of alkenes with aryl- and alkyl halides via an integrated Heck carbometalation/radical cross-coupling sequence. This protocol employing a chiral Ni/PHOX catalytic system allows terminal and internal alkenes to successfully engage the arylalkylation with exquisite control of regio-, chemo-, and stereoselectivity. More importantly, this reductive arylalkylation undergoes regio- and enantioselective arylnickelation followed by radical cross-coupling via Csp3–Csp3 reductive elimination, thus exhibiting reverse regioselectivity to the radical relay method. Mild reaction conditions and exceptional functional group tolerance facilitate this method's compatibility with bioactive motifs and the modular synthesis of biologically active compounds. The control experiments and density functional theory calculations provide insights into the mechanism and origin of regio- and stereoselectivity, and the hemilabile nature of the PHOX ligand is critical for achieving this enantioselective arylalkylation.
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