Heterogeneous Gold(I)‐Catalyzed Oxidative Ring Expansion of 2‐Alkynyl‐1,2‐Dihydropyridines or ‐Quinolines Towards Functionalized Azepines or Benzazepines
作者:Bingbo Niu、Quan Nie、Bin Huang、Mingzhong Cai
DOI:10.1002/adsc.201900512
日期:2019.9.3
A novel and efficient heterogeneous gold(I)‐catalyzed highly regio‐ and chemoselective oxidative ring expansion of 2‐alkynyl‐1,2‐dihydropyridines or ‐quinolines has been developed that proceeds smoothly through exclusive 1,2‐migration of a vinyl or phenyl group with pyridine N‐oxide as oxidant under mild conditions. The reaction provides a general and practical method for the synthesis of a wide variety