An Expeditious Route to Eight‐Membered Heterocycles By Nickel‐Catalyzed Cycloaddition: Low‐Temperature CC Bond Cleavage
作者:Puneet Kumar、Kainan Zhang、Janis Louie
DOI:10.1002/anie.201203521
日期:2012.8.20
diynes undergo a cycloaddition reaction catalyzed by Ni/IPr to give dihydroazocine compounds (see scheme; IPr=1,3‐bis(2,6‐diisopropylphenyl)imidazolidene). The reaction involves a challenging CC bond cleavage step, yet, surprisingly, proceeds at low temperature.
冷静的休息:3-氮杂环丁酮和各种二炔在 Ni/IPr 催化下发生环加成反应,得到二氢氮杂辛化合物(参见方案;IPr=1,3-双(2,6-二异丙基苯基)咪唑烷)。该反应涉及具有挑战性的C - C键断裂步骤,但令人惊讶的是,该反应在低温下进行。