双功能
烷基化
化学
吡啶
双金属片
催化作用
烯烃
卡宾
组合化学
选择性
试剂
有机化学
配体(生物化学)
药物化学
生物化学
受体
作者
Binyang Jiang,Jiaming Liu,Shi‐Liang Shi
标识
DOI:10.1021/acscatal.3c01098
摘要
Achieving site-selective alkylation with pyridine under transition metal catalysis has remained a long-standing challenge, especially when using unactivated alkene as an alkylating reagent. We herein describe a site-selective C2-alkylation of pyridine under Ni–Al bimetallic catalysis and directing bifunctional N-heterocyclic carbene (NHC) as ligand through hydroarylation of unactivated alkenes. A broad range of C2-alkylated pyridines with various functionalities could be prepared in high efficiency (up to 99% yield) and high C2-selectivity, and the scope of heterocycles is not limited to pyridines but can be expanded to other azines like pyrazines and pyrimidines. Mechanistic studies suggest that a bifunctional NHC–Ni–Al–pyridine complex is responsible for high site selectivity control and that reductive elimination might be the rate-determining step.
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