Total Synthesis of Echinopines A and B: Exploiting a Bioinspired Late-Stage Intramolecular Cyclopropanation
作者:Philippe A. Peixoto、Jean-Alexandre Richard、Rene Severin、David Y.-K. Chen
DOI:10.1021/ol202053m
日期:2011.11.4
Total synthesis of echinopine A and B have been accomplished, based on a strategy that involved two transition-metal-mediated ene-yne cycloisomerizations. A modified Pd-catalyzed enyne cycloisomerization/intramolecular Diels–Alder cascade rendered a more streamlined synthesis of tricyclic ketone 15, and a Ru-catalyzed ene-yne cycloisomerization/cyclopropanation resembled the late-stage [5/7] → [3/5/5/7]
基于涉及两个过渡金属介导的烯-炔环异构化的策略,已经完成了埃奇诺平A和B的全合成。修饰的Pd催化的烯炔环异构化/分子内Diels-Alder级联反应使三环酮15的合成更加简化,Ru催化的烯炔环异构化/环丙烷化反应类似于后期[5/7]→[3/5 / [5/7]中提出的生物合成途径中的成环序列。