Total Synthesis and Biological Evaluation of Ipomoeassin F and Its Unnatural 11<i>R</i>-Epimer
作者:Guanghui Zong、Eric Barber、Hazim Aljewari、Jianhong Zhou、Zhijian Hu、Yuchun Du、Wei Q. Shi
DOI:10.1021/acs.joc.5b01765
日期:2015.9.18
The conformation-controlled subtle reactivity differences of the hydroxyl groups in carbohydrates were utilized to quickly construct the disaccharide core, which, along with judicial selection of protecting groups, made the current synthesis very efficient. The same strategy was also applied to the smooth preparation of the 11R-epimer of ipomoeassin F for the first time. Cytotoxicity assays demonstrated
Ipomoeassin F 是一种含有嵌入二糖的大环内酯糖树脂,具有有效的体外抗肿瘤活性,但其功能机制尚不清楚。它以个位数纳摩尔IC 50值抑制肿瘤细胞生长,优于许多临床化疗药物。为了促进将其生物活性转化为蛋白质功能以用于药物开发,我们在此报告了一种新的合成方法,用于从市售起始材料中进行克级生产 ipomoeassin F(17 个线性步骤,产量达到 3.8%)。利用碳水化合物中羟基的构象控制的细微反应性差异来快速构建二糖核心,再加上保护基团的合理选择,使得当前的合成非常有效。同样的策略也首次应用于ipomoeassin F 11 R-差向异构体的顺利制备。细胞毒性测定证明了天然 11 S构型的关键作用。此外,还对 ipomoeassin F 和/或其差向异构体进行了细胞周期分析和细胞凋亡测定。这项工作为未来了解 ipomoeassin 糖脂家族的药用潜力奠定了坚实的基础。