Au-Catalyzed [2 + 3] Annulation of Enamides with Propargyl Esters: Total Synthesis of Cephalotaxine and Cephalezomine H
作者:Xiao-Yan Ma、Xian-Tao An、Xian-He Zhao、Ji-Yuan Du、Yu-Hua Deng、Xiang-Zhi Zhang、Chun-An Fan
DOI:10.1021/acs.orglett.7b01202
日期:2017.6.2
A novel Au-catalyzed [2 + 3] annulation reaction of enamides with propargyl esters has been developed, providing a new method for expeditious assembly of synthetically useful functionalized 1-azaspiro[4.4]nonane building blocks. Based on this key annulation, strategic installation of the pivotal azaspirocyclic core, followed by constructing the benzazepine unit via Witkop cyclization, led to the divergent
已经开发了一种新的Au催化的酰胺与炔丙基酯的[2 + 3]环化反应,为快速组装合成有用的功能化1-azaspiro [4.4]壬烷构件提供了新方法。基于这一关键的环空,战略性地安装了关键的氮杂螺环核心,然后通过Witkop环化构建苯并ze庚因单元,导致头孢他辛和头孢唑烷H的总合成有所不同。