Enantioselective Total Synthesis of (+)-Garsubellin A.

Enantioselective Total Synthesis of (+)-Garsubellin A.
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DOI:
10.1002/anie.202109193
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发表时间:
2021-10-11
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Lee C
Lee C
中科院分区:
其他
文献类型:
--
作者:
Jang D;Choi M;Chen J;Lee C

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Garsubellin A是一种能够增强胆碱乙酰转移酶的硫代萜类化合物,其水平降低被认为在阿尔茨海默病的症状中起着核心作用。由于具有潜在的生物活性,再加上新型的桥联和稠合的环状分子结构,Garsubellin A已经引起了人们的极大兴趣,但其绝对立体结构尚未确定。我们首次报道了(+)-Garsubellin A的立体选择性全合成,我们的合成依赖于环己酮骨架的立体选择性形成和1,2-乙二硫醇的双共轭加成,促进了羟醛环化以构建双环[3.3.1]骨架。十二步、无保护基团的合成路线使天然(−)-Garsubellin A及其非天然(+)-对映体的合成成为可能,用于生物学评价。首次对映选择性全合成Garsubellin A建立了植物来源的分叶萜烯的绝对立体结构,该结构增强了负责神经递质乙酰胆碱的生物合成的胆碱乙酰转移酶。无保护基团的12步合成的特点是使用二硫杂环戊烷来有效地构建桥联和稠环体系。
Garsubellin A is a meroterpene capable of enhancing the enzyme choline acetyltransferase whose decreased level is believed to play a central role in the symptoms of Alzheimer's disease. Due to the potentially useful biological activity together with the novel bridged and fused cyclic molecular architecture, garsubellin A has garnered substantial synthetic interest, but its absolute stereostructure has been undetermined. We report here the first enantioselective total synthesis of (+)‐garsubellin A. Our synthesis relies on stereoselective fashioning of a cyclohexanone framework and double conjugate addition of 1,2‐ethanedithiol that promotes aldol cyclization to build the bicyclic [3.3.1] skeleton. The twelve‐step, protecting group‐free synthetic route has enabled the syntheses of both the natural (−)‐garsubellin A and its unnatural (+)‐antipode for biological evaluations. The first enantioselective total synthesis of garsubellin A establishes the absolute stereostructure of the plant‐derived meroterpene that enhances the choline acetyltransferase enzyme responsible for the biosynthesis of the neurotransmitter acetylcholine. The 12‐step, protecting group‐free synthesis features use of a dithiolane for efficient construction of the bridged and fused ring system.
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期刊: ORGANIC LETTERS
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影响因子: --
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