Development of α-Selective Glycosylation with l-Oleandral and Its Application to the Total Synthesis of Oleandrin.

Development of α-Selective Glycosylation with l-Oleandral and Its Application to the Total Synthesis of Oleandrin.
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DOI:
10.1021/acs.orglett.2c04358
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发表时间:
2023-02-17
期刊:
影响因子:
5.2
通讯作者:
Nagorny, Pavel
Nagorny, Pavel
中科院分区:
化学1区
文献类型:
--
作者:
Carney, Nolan;Perry, Natasha;Garabedian, Jacob;Nagorny, Pavel

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本文介绍了以天然产物中常见的2-脱氧糖L-齐墩果糖为原料进行α选择性糖基化反应,并将其应用于天然强心类固醇齐墩果苷和大豆皂苷的全合成。为了提高反应的非对映选择性和最大限度地减少副产物的生成,对以L油和玫瑰为供体的洋地黄素的α选择性糖基化反应条件进行了广泛的评价和优化。这些研究探索了8种不同的膦·酸配合物或盐,得到了Hbr·PPh3作为最佳催化剂,它提供了最清洁的α糖基化反应,并以67%的产率生成了受保护的大豆皂苷。随后将这些条件应用于合成齐墩果素,以69%的分离收率获得了所需的α产物--使睾酮在17步(得率1.2%)内完成了首次合成齐墩果苷。
This article describes the development of an α-selective glycosylation using L-oleandrose, a 2-deoxysugar that is frequently found in natural products, and its application to the total synthesis of natural cardiotonic steroids oleandrin and beaumontoside. To improve the reaction diastereoselectivity and to minimize side-product formation, an extensive evaluation and optimization of the conditions leading to α-selective glycosylation of digitoxigenin with L-oleandrose-based donors was conducted. These studies led to the exploration of 8 different phosphine•acid complexes or salts and yielded HBr•PPh3 as the optimal catalyst, which provided in the cleanest α-glycosylation and produced protected beaumontoside in 67% yield. Subsequent application of these conditions to synthetic oleandrigenin afforded the desired α-product in 69% isolated yield-enabling the completion of the first synthesis of oleandrin in 17 steps (1.2% yield) from testosterone.
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