Stannylene-Mediated Regioselective 6-<i>O</i>-Glycosylation of Unprotected Phenyl 1-Thioglycopyranosides
作者:Agnese Maggi、Robert Madsen
DOI:10.1002/ejoc.201300026
日期:2013.5
straightforward procedure is described for the synthesis of (16)-linked saccharides by regioselective glycosylation of unprotected glycosyl acceptors. Phenyl 1-thioglycopyranosides derived from D-glucose, D-galactose and D-mannose were treated with dibutyltin oxide to introduce a stannylene acetal, and then subjected to selective glycosylation at the 6-position with the Koenigs–Knorr protocol. Peracylated glycosyl
描述了通过未受保护的糖基受体的区域选择性糖基化合成 (16) 连接的糖类的简单程序。衍生自 D-葡萄糖、D-半乳糖和 D-甘露糖的苯基 1-巯基吡喃糖苷用氧化二丁基锡处理以引入亚锡基缩醛,然后使用 Koenigs-Knorr 方案在 6 位进行选择性糖基化。D-葡萄糖、D-半乳糖、D-甘露糖和D-葡糖胺的过酰化糖基溴化物用作供体,以中等至良好的产率得到相应的(16)-连接的二糖。使用衍生自 D-葡萄糖和 D-半乳糖的糖基供体和受体获得最佳结果。完全酰化的二糖硫糖苷也可以作为区域选择性偶联的糖基供体。