Synthesis of Cardiotonic Steroids Oleandrigenin and Rhodexin B.

Synthesis of Cardiotonic Steroids Oleandrigenin and Rhodexin B.
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DOI:
10.1021/acs.joc.1c00985
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发表时间:
2021-08-06
期刊:
The Journal of organic chemistry
影响因子:
--
通讯作者:
Nagorny P
Nagorny P
中科院分区:
其他
文献类型:
--
作者:
Fejedelem Z;Carney N;Nagorny P

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本文描述了强心甾体油苷配基(7)的简明合成及其随后从容易获得的中间体(8)加工成天然产物rhodexin B(2),该中间体(8)可以通过三步序列从市售甾体睾酮或DHEA衍生。这些研究的特点是基于β14-羟基定向环氧化和随后的环氧化物重排的β16-氧化的有利装置。随后的C17呋喃部分的单线态氧氧化提供了在12个步骤(LLS)中获得油茶皂苷元(7)的途径,并且从8得到3.1%的总产率。使用Pd(II)-催化剂,用基于l-吡喃鼠李糖苷的供体28成功地将合成的齐墩果素配基(7)糖基化,随后在酸性条件下脱保护,以66%的产率(两步)提供细胞毒性天然产物rhodexin B(2)。
This article describes a concise synthesis of cardiotonic steroids oleandrigenin (7) and its subsequent elaboration into the natural product rhodexin B (2) from the readily available intermediate (8) that could be derived from the commercially available steroids testosterone or DHEA via three-step sequences. These studies feature an expedient installation of the β16-oxidation based on β14-hydroxyl-directed epoxidation and subsequent epoxide rearrangement. The following singlet oxygen oxidation of the C17 furan moiety provides access to oleandrigenin (7) in 12 steps (LLS) and a 3.1% overall yield from 8. The synthetic oleandrigenin (7) was successfully glycosylated with l-rhamnopyranoside-based donor 28 using a Pd(II)-catalyst, and the subsequent deprotection under acidic conditions provided cytotoxic natural product rhodexin B (2) in a 66% yield (two steps).
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DOI: 10.1021/acs.joc.1c00985
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