Total Synthesis of (-)-Lasonolide A.

Total Synthesis of (-)-Lasonolide A.
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DOI:
10.1021/jacs.6b05127
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发表时间:
2016-09-14
影响因子:
15
通讯作者:
Kalkofen R
Kalkofen R
中科院分区:
化学1区
文献类型:
--
作者:
Trost BM;Stivala CE;Fandrick DR;Hull KL;Huang A;Poock C;Kalkofen R

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lasonolides是一种新型的多酮类化合物,在体外对多种癌细胞表现出显著的生物活性。在这里,我们描述了第一代正式合成lasonolide a的方法。这些研究的关键发现最终使我们能够继续并完成lasonolide a的全合成。聚合方法利用ru催化的烯烃-炔偶联将两个高度复杂的片段结合在一起。这种类型的耦合通常会产生分支产物,但是通过详细的研究,我们现在能够证明,对底物的细微结构变化可以改变选择性,以有利于线性产物的形成。片段的合成具有许多原子经济转化的特点,其中突出的是发现了一种工程酶,可以对β-酮酯进行动态动力学还原,以建立具有高水平对映选择性的南四氢吡喃环的绝对立体化学。
The lasonolides are novel polyketides that have displayed remarkable biological activity in vitro against a variety of cancer cell lines. Herein we describe our first generation approach to the formal synthesis of lasonolide A. The key findings from these studies ultimately allowed us to go on and complete a total synthesis of lasonolide A. The convergent approach unites two highly complex fragments utilizing a Ru-catalyzed alkene-alkyne coupling. This type of coupling typically generates branched products, however through a detailed investigation we are now able to demonstrate that subtle structural changes to the substrates can alter the selectivity to favor the formation of the linear product. The synthesis of the fragments features a number of atom economical transformations which are highlighted by the discovery of an engineered enzyme to perform a dynamic kinetic reduction of a β-ketoester to establish the absolute stereochemistry of the southern tetrahydropyran ring with high levels of enantioselectivity.
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发表时间: 2011-07-13
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