Convergency and Divergency as Strategic Elements in Total Synthesis: The Total Synthesis of (−)-Drupacine and the Formal Total Synthesis of (±)-Cephalotaxine, (−)-Cephalotaxine, and (+)-Cephalotaxine
作者:Qi Liu、Eric M. Ferreira、Brian M. Stoltz
DOI:10.1021/jo0710883
日期:2007.9.1
A concise route toward the syntheses of (−)-drupacine and (+)- and (−)-cephalotaxine has been developed. The syntheses rely on Pd(II)-catalyzed aerobic oxidative heterocyclization chemistry, which was employed to rapidly construct an important spirocyclic amine intermediate. A dynamic β-elimination/conjugate addition process was strategically applied to complete the first asymmetric total synthesis
已经开发出一种简明的合成(-)-杜帕卡因和(+)-和(-)-头孢他辛的方法。合成依赖于Pd(II)催化的好氧氧化杂环化学,该化学可用于快速构建重要的螺环胺中间体。策略性地应用了动态β消除/共轭加成过程,以完成(-)-杜拉帕汀的首次不对称全合成。