Selective [5 + 1] and [5 + 2] Cycloaddition of Ynamides or Propargyl Esters with Benzo[<i>d</i>]isoxazoles via Gold Catalysis
作者:Wei Xu、Jidong Zhao、Xiangdong Li、Yuanhong Liu
DOI:10.1021/acs.joc.8b02935
日期:2018.12.21
Benzo[d]isoxazoles are found to act as novel nucleophiles to undergo gold-catalyzed [5 + 1] or [5 + 2] cycloaddition reactions with ynamides. The reaction provides a concise and chemoselective access to polysubstituted 2H-benzo[e][1,3]oxazines or benzo[f][1,4]oxazepines. In addition, benzo[d]isoxazoles can also react with gold-carbene intermediates derived from propargyl esters to afford [5 + 1] annulation
发现苯并[ d ]异恶唑可作为新型亲核试剂与金酰胺进行金催化的[5 + 1]或[5 + 2]环加成反应。该反应提供了对多取代的2 H-苯并[ e ] [1,3]恶嗪或苯并[ f ] [1,4]氧杂ze子的简明和化学选择性的途径。另外,苯并[ d ]异恶唑也可以与衍生自炔丙基酯的金卡宾中间体反应,得到[5 +1]环化产物。