Concise Approach to the “Higher Sugar” Core of the Nucleoside Antibiotic Hikizimycin
作者:Alois Fürstner、Margarita Wuchrer
DOI:10.1002/chem.200500791
日期:2006.1
A highly productive synthesis of phenylthio glycoside 33 is described which constitutes a fully functional surrogate for the hikosamine core of hikizimycin 1, a complex nucleoside antibiotic endowed with promising anthelmintic properties. The chosen approach to this undecose derivative starts from mannofuranose 7 which was one-carbon homologated to alkyne 8 in one step on treatment with lithio (tr
描述了苯硫苷33的高产合成,其构成了hizizimycin 1的hikosamine核心的全功能替代物,hikizimycin 1是一种具有希望的驱虫特性的复杂核苷抗生素。选择这种十一烷衍生物的方法是从甘露糖呋喃糖7开始,它在用硫代(三甲基甲硅烷基)重氮甲烷处理的一个步骤中被一碳同炔烃8碳同化。通过Nozaki-Hiyama-Kishi反应将衍生自8的炔基碘化物12与酒石酸衍生的醛17合并,该反应可使用化学计量过量的CrCl2或基于猫的周转量的催化歧管来进行。CrCl2 /氯硅烷/锰氧化还原对。将生成的炔烃18半加氢成(Z)-烯烃19需要使用Pd / C作为催化剂,而传统的Lindlar还原效果不理想。通过使用催化量的OsO4和NMO作为化学计量的氧化剂尝试进行烯烃22的顺式-二羟基化反应(由19与邻苯二甲酰亚胺的Mitsunobu反应形成)基本上失败,而化学计量的甲磺酰化作用则得到了稳定