Chelation-Assisted RhI-Catalyzed ortho-Alkylation of Aromatic Ketimines or Ketones with Olefins
作者:Chul-Ho Jun、Choong Woon Moon、Jun-Bae Hong、Sung-Gon Lim、Kwan-Yong Chung、Yeon-Hee Kim
DOI:10.1002/1521-3765(20020118)8:2<485::aid-chem485>3.0.co;2-1
日期:2002.1.18
herein is the Rh(I)-catalyzed ortho-alkylation of aromatic ketimines or ketones with olefins. This method showed high reactivity and selectivity to monoalkylation for a variety of olefins including 1-alkenes with an allylic proton, alpha,omega-dienes, and internal olefins. For a mechanistic study, H/D exchange experiments were carried out, which demonstrated that the ortho C-H bond could be easily cleaved
本文描述的是芳族酮亚胺或酮与烯烃的Rh(I)催化的邻烷基化。该方法对包括烯烃烯丙基质子,α,ω-二烯和内烯烃的1-烯烃在内的各种烯烃显示出高反应活性和对单烷基化的选择性。为了进行机理研究,进行了H / D交换实验,结果表明,即使在45°C的低温下,邻位CH键也很容易断裂。该反应的关键步骤是形成稳定的五元链通过螯合辅助邻位CH键活化的金属环。此外,通过添加50mol%的苄胺作为螯合辅助工具,成功实现了Rh(I)配合物与芳族酮的直接邻烷基化。