The first synthesis of the pentasaccharide fragment of the angucycline antibiotic saquayamycin Z is described. By using our sulfonyl chloride mediated reagent controlled dehydrative glycosylation, we are able to assemble the glycosidic linkages with high levels of anomeric selectivity. The total synthesis was completed in 25 total steps, and in 2.5% overall yield with a longest linear sequence of 15
描述了环霉素
抗生素saquayamycin Z的五糖片段的首次合成。通过使用我们的
磺酰氯介导的试剂控制的
脱水糖基化,我们能够以高
水平的端基异构体选择性组装糖苷键。全部合成以25个总步骤完成,总产率为2.5%,最长线性序列为15个步骤。