Synthesis of the 5/5-spiroindimicin alkaloids: development of a general synthetic approach and biological investigations.

IF 2.9 3区 化学 Q1 CHEMISTRY, ORGANIC Organic & Biomolecular Chemistry Pub Date : 2024-11-06 DOI:10.1039/d4ob01552e
Ankush Banerjee, Tiffany A Brisco, Sneha Ray, Arani Datta, Xiaoyu Zhang, Zhen Zhang, Alexander A Busse, Hanspeter Niederstrasser, Krissty Sumida, Bruce A Posner, Dawn M Wetzel, Margaret A Phillips, Myles W Smith
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Abstract

We describe the development of a unified synthetic strategy for the preparation of all known 5/5-spirocyclic spiroindimicin (SPM) alkaloids, namely spiroindimicins B-G. The present synthetic route relies on four fundamental transformations: Grignard-based fragment coupling between halogenated pyrrolemetal and isatin partners, Suzuki coupling to generate a triaryl scaffold encompassing all requisite skeletal atoms of the natural products, Lewis acid-mediated spirocyclization to construct the 5/5-spirocyclic core, and chemoselective lactam reduction. The developed syntheses are step-economic (6-7 steps from commercial materials), scalable, and amenable to analogue synthesis. Preliminary investigations into a catalytic asymmetric spirocyclization towards an enantioselective SPM synthesis are also described. Further studies of the antiparasitic properties of this class have revealed promising activity against T. brucei for certain congeners. Together with our prior approach to the 6/5-family members, our work constitutes a synthetic solution to all known spiroindimicin natural products.

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5/5 螺吲哚生物碱的合成:通用合成方法的开发和生物学研究。
我们介绍了一种用于制备所有已知 5/5-螺环螺环吲哚生物碱(SPM)(即螺环吲哚生物碱 B-G)的统一合成策略。本合成路线依赖于四种基本转化:卤化吡咯金属和异靛红伙伴之间基于格氏片段偶联,通过铃木偶联生成包含天然产物所有必要骨架原子的三芳基支架,通过路易斯酸介导的螺环化反应构建 5/5 螺环核心,以及化学选择性内酰胺还原。所开发的合成方法具有步骤经济性(使用商业材料只需 6-7 个步骤)、可扩展性和可进行类似物合成的特点。此外,还介绍了催化不对称螺环化实现对映体选择性 SPM 合成的初步研究。对该类化合物抗寄生虫特性的进一步研究表明,某些同系物对布鲁西绦虫具有良好的活性。结合我们之前对 6/5 家族成员的研究,我们的研究工作为所有已知的螺氨蛋白天然产物提供了一种合成解决方案。
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来源期刊
Organic & Biomolecular Chemistry
Organic & Biomolecular Chemistry 化学-有机化学
CiteScore
5.50
自引率
9.40%
发文量
1056
审稿时长
1.3 months
期刊介绍: The international home of synthetic, physical and biomolecular organic chemistry.
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Back cover Interrogating the potential of helical aromatic foldamers for protein recognition. Synthesis of the 5/5-spiroindimicin alkaloids: development of a general synthetic approach and biological investigations. Electrochemical one-pot cascade synthesis of thio(seleno)cyanato-substituted thiazolidine-2-imines without external electrolyte. Novel electron donor-acceptor (EDA) complex promoted arylation of 2-oxo-2H-chromene-3-carbonitriles under visible light irradiation.
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