Gold-Catalyzed Oxidative Ring Expansion of 2-Alkynyl-1,2-Dihydropyridines or -quinolines: Highly Efficient Synthesis of Functionalized Azepine or Benzazepine Scaffolds
作者:Ming Chen、Yifeng Chen、Ning Sun、Jidong Zhao、Yuanhong Liu、Yuxue Li
DOI:10.1002/anie.201410056
日期:2015.1.19
A gold‐catalyzed highly regio‐ and chemoselective oxidative ring expansion of 2‐alkynyl‐1,2‐dihydropyridines and its analogues using pyridine‐N‐oxide as the oxidant has been developed. Ring expansion proceeds through exclusive 1,2‐migration of a vinyl or phenyl group, whereas no 1,2‐H and 1,2‐N migration take place. The reaction provides an efficient and attractive route to various types of medium‐sized
已经开发了使用吡啶-N-氧化物作为氧化剂的金催化的2-炔基1,2-二氢吡啶及其类似物的高度区域和化学选择性氧化环扩展。环的扩展通过乙烯基或苯基的1,2-迁移而进行,而没有1,2-H和1,2-N迁移。该反应提供了一种高效且有吸引力的途径,可以以较高的收率和优异的收率以及各种官能团耐受性来获得各种类型的中型氮杂环庚烷衍生物。DFT研究表明,反应是通过形成环丙基金中间体进行的,并且不涉及卡宾金。