We have established a highly convergent 10‐step route for the totalsynthesis of (−)‐deoxoapodine, which is a hexacyclic aspidosperma alkaloid. The quaternary C5 center of the characteristic tetrahydrofuran ring was constructed by a chiral‐phosphoric‐acid‐catalyzed enantioselective bromocycloetherification in a 5‐endo fashion and subsequent allylation by using the Keck protocol. Construction of the
Total Syntheses of (−)-Deoxoapodine, (−)-Kopsifoline D, and (−)-Beninine
作者:Yi-Guo Zhou、Henry N. C. Wong、Xiao-Shui Peng
DOI:10.1021/acs.joc.9b02918
日期:2020.1.17
The total syntheses of Aspidosperma and Kopsia alkaloids (-)-deoxoapodine, (-)-kopsifoline D, and (-)-beninine are described through a domino deprotection-Michael addition-nucleophilic substitution protocol to assemble the core framework in efficient steps. Corey-Bakshi-Shibata reduction was employed to afford the enantioenriched intermediate for the total syntheses of the aforementioned alkaloids. The
Total Synthesis of (−)-Voacinol and (−)-Voacandimine C
作者:Kristen M. Flynn、In-Soo Myeong、Taylor Pinto、Mohammad Movassaghi
DOI:10.1021/jacs.2c03057
日期:2022.5.25
We describe the first total synthesis of complex aspidosperma alkaloids (−)-voacinol and (−)-voacandimine C via a late-stage C7-methylenation strategy inspired by a biogenetic hypothesis. We envisioned rapid access to these natural alkaloids from a common, symmetricalprecursor assembled by methylenation of a D-ring-oxidized variant of the structurally related natural product (−)-deoxoapodine. Chemoselective
我们通过受生物遗传假说启发的晚期 C7-亚甲基化策略,描述了复杂无子植物生物碱 (−)-voacinol 和 (−)-voacandimine C 的首次全合成。我们设想从一种常见的对称前体快速获取这些天然生物碱,该前体通过结构相关天然产物 (−)-deoxoapodine 的 D 环氧化变体的亚甲基化组装而成。五环 deoxoapodine 前体的化学选择性 N9-氧化能够合成相应的六环 C8-氨基腈。deoxoapodine 的 C8-烯胺衍生物的立体控制亚甲基化,通过 C8-氨基腈的电离获得,提供对称的十二环双氨基腈作为这些双吲哚生物碱的多功能前体。最后阶段,受生物合成启发,
Total Syntheses of (−)-Kopsifoline D and (−)-Deoxoapodine: Divergent Total Synthesis via Late-Stage Key Strategic Bond Formation
作者:Kiyoun Lee、Dale L. Boger
DOI:10.1021/ja500548e
日期:2014.2.26
formation). The combined efforts represent the totalsyntheses of members of four classes of natural products from a common intermediate functionalized for late-stage formation of four different key strategic bonds uniquely embedded in each natural product core structure. Key to the first reported totalsynthesis of a kopsifoline that is detailed herein was the development of a transannular enamide alkylation