Total Synthesis of (-)-Voacinol and (-)-Voacandimine C.

Total Synthesis of (-)-Voacinol and (-)-Voacandimine C.
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全合成了(-)-Voacinol和(-)-Voacandimine C。

DOI:
10.1021/jacs.2c03057
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发表时间:
2022-05-25
影响因子:
15
通讯作者:
Movassaghi, Mohammad
Movassaghi, Mohammad
中科院分区:
化学1区
文献类型:
--
作者:
Flynn, Kristen M.;Myeong, In-Soo;Pinto, Taylor;Movassaghi, Mohammad

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我们描述了第一个全合成的复杂的spidosperma生物碱(-)-voacinol和(-)-voacandimine C通过后期阶段的C7-亚甲基化策略的启发下,生物遗传假说。我们设想快速获得这些天然生物碱从一个共同的,对称的前体组装的结构相关的天然产物(-)-deoxoapodine的D-环氧化变体的亚甲基化。五环deoxoapodine前体的化学选择性N9-氧化使得能够合成相应的六环C8-氨基腈。立体控制的亚甲基化的C8-烯胺衍生物deoxoapodine,获得电离的C8-氨基腈,提供了对称的十二环bisaminonitrile作为一个通用的前体,这些bisindole生物碱。最后阶段,生物合成启发,控制还原开放的oxolane亚结构的这个十二环中间体提供了一个统一的方法(-)-voacinol和(-)-voacandimine C,而直接还原相同的中间体提供了结构相关的(-)-亚甲基bisdeoxoapodine。
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, symmetrical precursor assembled by methylenation of a D-ring-oxidized variant of the structurally related natural product (–)-deoxoapodine. Chemoselective N9-oxidation of a pentacyclic deoxoapodine precursor enabled the synthesis of the corresponding hexacyclic C8-aminonitrile. Stereocontrolled methylenation of a C8-enamine derivative of deoxoapodine, accessed by ionization of the C8-aminonitrile, afforded a symmetrical dodecacyclic bisaminonitrile as a versatile precursor to these bisindole alkaloids. Final-stage, biosynthesis-inspired, controlled reductive opening of the oxolane substructures of this dodecacyclic intermediate provided a unified approach to (–)-voacinol and (–)-voacandimine C, while direct reduction of the same intermediate afforded the structurally related (–)-methylenebisdeoxoapodine.
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