Enantioselective Approach to Quinolizidines: Total Synthesis of Cermizine D and Formal Syntheses of Senepodine G and Cermizine C
作者:Nagarathanam Veerasamy、Erik C. Carlson、Nathan D. Collett、Mrinmoy Saha、Rich G. Carter
DOI:10.1021/jo400324t
日期:2013.5.17
The formal syntheses of C5-epi-senepodine G and C5-epi-cermizine C have been accomplished through a novel diastereoselective, intramolecular amide Michael addition process. The total synthesis of cermizine D has been achieved through use of an organocatalyzed, heteroatom Michael addition to access a common intermediate. Additional key steps of this sequence include a matched, diastereoselective alkylation
C的正式合成5 -外延-senepodine G和C 5 -外延-cermizine C 是通过一种新型的非对映选择性、分子内酰胺迈克尔加成过程完成的。cermizine D 的全合成是通过使用有机催化的杂原子迈克尔加成获得常见中间体来实现的。该序列的其他关键步骤包括使用碘甲基苯硫醚和砜-醛偶联/还原脱硫序列进行匹配的非对映选择性烷基化,以结合主要亚基。已经在功能密集的耦合伙伴上探索了 Hartwig 式 C-N 耦合的效用。已经研究了对 α,β-不饱和砜的非对映选择性共轭加成,这仅通过六步即可从市售起始材料中提供关键的砜中间体。N -Boc 保护的哌啶砜。