Copper-Catalyzed Three-Component Annulations of Alkenes, Nitrosoarenes, and N-Hydroxyallylamines To Form Fused Oxazinane/Isoxazolidine Heterocycles
作者:Rahul Kisan Kawade、Rai-Shung Liu
DOI:10.1002/anie.201611388
日期:2017.2.13
One‐pot cascade annulations among nitrosoarenes, alkenes, and N‐hydroxyallylamines have been achieved with CuCl/O2 catalysts, forming fused oxazinane/isoxazolidine heterocycles with excellent diastereoselectivity (d.r. >20:1). To enhance the synthetic utility, we developed a successive cleavage of the two N−O bonds of the resulting heterocycles. A mechanism involving dipolar [3+2] cycloadditions of
使用CuCl / O 2催化剂可实现亚硝基芳烃,烯烃和N-羟基烯丙胺之间的一锅级联反应,形成具有出色的非对映选择性(dr> 20:1)的稠合的恶嗪烷/异恶唑烷杂环。为了增强合成效用,我们开发了所得杂环的两个N-O键的连续裂解。推测了涉及硝酮中间体与它们的链状烯烃的偶极[3 + 2]环加成的机理以形成这些杂环。