Vinyl Glycosides in Oligosaccharide Synthesis (Part 6): 3-Buten-2-YL 2-Azido-2-Deoxy Glycosides and 3-Buten-2-YL 2-Phthalimido-2-Deoxy Glycosides as Novel Glycosyl Donors
作者:Yu Bai、Geert-Jan Boons、Andrew Burton、Matthew Johnson、Michael Haller
DOI:10.1080/07328300008544127
日期:2000.1
and 19 can be conveniently isomerised by treatment with a catalytic amount of (Ph3P)3RhCl/BuLi to give the active vinyl glycosides 6, 17 and 20 in high yield. These glycosyl donors were successfully used in glycosylations with acceptors 7, 9 and 11. In the case of glycosyl donor 6, the disaccharides 8, 10 and 12 could be obtained as anomeric mixtures or with high α-or β-selectivities depending on the
据报道潜在活性糖基化策略的扩展,其中3-丁烯-2-基2-脱氧-2-叠氮基糖苷和3-丁烯-2-基2-脱氧-2-邻苯二甲酰亚胺基糖苷被用作制备甲壳素的结构单元。含氨基糖的寡糖。潜基板的烯丙基部分5,16和19可以通过处理来方便地与异构化(PH催化量3 P)3的RhCl /丁基锂以得到活性乙烯基苷6,17和20以高收率。这些糖基供体已成功用于受体7、9和11的糖基化。在糖基供体6的情况下,二糖根据所选择的反应条件,可以以异头混合物形式或以高α-或β-选择性获得8、10和12。在每种情况下用糖基供体17和20的糖基化仅以高收率仅产生β-连接的产物。