Modular Total Synthesis and Cell-Based Anticancer Activity Evaluation of Ouabagenin and Other Cardiotonic Steroids with Varying Degrees of Oxygenation
作者:Hem Raj Khatri、Bijay Bhattarai、Will Kaplan、Zhongzheng Li、Marcus John Curtis Long、Yimon Aye、Pavel Nagorny
DOI:10.1021/jacs.8b12870
日期:2019.3.27
diastereoselective Michael/aldol cascade approach is used to accomplish concise total syntheses of cardiotonic steroids with varying degrees of oxygenation including cardenolides ouabagenin, sarmentologenin, 19-hydroxysarmentogenin, and 5- epi-panogenin. These syntheses enabled the subsequent structure activity relationship (SAR) studies on 37 synthetic and natural steroids to elucidate the effect of oxygenation
Cu(II)-催化的非对映选择性迈克尔/醛醇级联方法用于完成具有不同氧化程度的强心类固醇的简明全合成,包括cardenolides ouabagenin、sarmentologenin、19-hydroxysarmentogenin和5-epi-panogenin。这些合成使随后对 37 种合成和天然类固醇的构效关系 (SAR) 研究能够阐明氧化作用、立体化学、C3-糖基化和 C17-杂环的影响。基于对合成和天然类固醇及其衍生物的平行评估,糖基化类固醇 cannogenol-l-α-rhamnoside (79a)、strophanthidol-l-α-rhamnoside (92)、和洋地黄毒苷-l-α-鼠李糖苷 (97) 被鉴定为最有效的类固醇,在 10-100 nM 浓度下表现出广泛的抗癌活性和选择性(3 μM 时对 NIH-3T3、MEF 和发育中的鱼胚胎无毒)。进一步的分析表明,