Total Synthesis and Biological Evaluation of Glycolipids Plakosides A, B and Their Analogs
作者:Kyriacos C. Nicolaou、Jim Li、Gerhard Zenke
DOI:10.1002/1522-2675(20000809)83:8<1977::aid-hlca1977>3.0.co;2-d
日期:2000.8.9
The total synthesis of plakosides A (1) and B (2), and their designed analogs 3 – 10 was accomplished. The convergent strategy employed involved construction of the individual building blocks employing the Sharpless asymmetric dihydroxylation and the Charette asymmetric cyclopropanation reactions to introduce the desired configuration, followed by their couplings and final elaboration. Thus, key intermediates
完成了 plakosides A (1) 和 B (2) 及其设计的类似物 3 – 10 的全合成。所采用的收敛策略涉及使用 Sharpless 不对称二羟基化和 Charette 不对称环丙烷化反应构建单个结构单元以引入所需的构型,然后是它们的偶联和最终精细化。因此,关键中间体 12 – 14 以其光学活性形式制备,并通过糖苷化反应和酰胺键形成连接,在适当的加工和最终脱保护后产生目标分子。合成的化合物 1-10 在体外评估了它们的免疫抑制特性,发现只有适度的活性。