Rapid Access to 2,2-Disubstituted Indolines via Dearomative Indolic-Claisen Rearrangement: Concise, Enantioselective Total Synthesis of (+)-Hinckdentine A.

Rapid Access to 2,2-Disubstituted Indolines via Dearomative Indolic-Claisen Rearrangement: Concise, Enantioselective Total Synthesis of (+)-Hinckdentine A.
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DOI:
10.1021/jacs.3c03611
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发表时间:
2023-07-12
影响因子:
15
通讯作者:
Rawal, Viresh H.
Rawal, Viresh H.
中科院分区:
化学1区
文献类型:
--
作者:
Baidilov, Daler;Elkin, Pavel K.;Athe, Sudhakar;Rawal, Viresh H.

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长期以来,2,2-二取代吲哚的构建一直是一个合成挑战,没有任何通用的解决方案。在这里,我们报告了一个健壮的3-吲哚醇的Meerwein-Eschenmoser-Claisen重排反应方案,它提供了2-取代和2,2-二取代吲哚的有效途径。这些用途广泛的亚基对天然产物合成和药物化学非常有用。标题为[3,3]的Sigmatroic重排反应以优异的产率进行,并将C3-吲哚醇手性高保真地转移到C2位,从而为构建对映体富含2,2-二取代吲哚提供了可靠的方法。这一方法的威力通过简洁和具有战略意义的独特的海洋天然产物欣克登丁A的全合成来证明,其特点是脱芳烃Claisen重排,烯烃产品的非对映控制氢化,使用Vaska的络合物一锅法将酰胺转化为肟,以及区域选择性的后期三溴化反应。
The construction of 2,2-disubstituted indolines has long presented a synthetic challenge without any general solutions. Herein, we report a robust protocol for the dearomative Meerwein–Eschenmoser–Claisen rearrangement of 3-indolyl alcohols that provides efficient access to 2-substituted and 2,2-disubstituted indolines. These versatile subunits are useful for natural product synthesis and medicinal chemistry. The title [3,3] sigmatropic rearrangement proceeds in generally excellent yield and transfers the C3-indolic alcohol chirality to the C2 position with high fidelity, thus providing a reliable method for the construction of enantioenriched 2,2-disubstituted indolines. The power of this methodology is demonstrated through the concise and strategically unique total synthesis of the marine natural product hinckdentine A, which features a dearomative Claisen rearrangement, a diastereocontrolled hydrogenation of the alkene product, a one-pot amide-to-oxime conversion using Vaska’s complex, and a regioselective late-stage tribromination.
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