Reductive Oxy-Nazarov Cyclization toward Expedient Construction of a Cyclopenta[1,2-<i>b</i>]pyrrolo[1,2-<i>a</i>]azepine Ring System: Formal Total Syntheses of Stemonamine and Cephalotaxine
作者:Xifei Yan、Qin Zhang、Jianfeng Zheng、Wei-Dong Z. Li
DOI:10.1021/acs.joc.4c00035
日期:2024.4.5
cyclopenta[1,2-b]pyrrolo[1,2-a]azepine ring skeleton were achieved. The general synthetic strategy in the synthesis features the reductive oxy-Nazarov cyclization as key step, leading to the versatile construction of N-substituted spiro quaternary stereogenic centers from readily available starting materials.
实现了以环戊[1,2- b ]吡咯并[1,2- a ]氮杂环骨架为核心的百部胺和头孢他辛的正式全合成。合成中的一般合成策略以还原性氧-纳扎罗夫环化为关键步骤,从而从容易获得的起始材料中实现 N-取代螺环四元立体中心的多功能构建。