Glycosylations Directed by the Armed-Disarmed Effect with Acceptors Containing a Single Ester Group
作者:Thomas H. Schmidt、Robert Madsen
DOI:10.1002/ejoc.200700347
日期:2007.8
A selective glycosylation reaction controlled by the armed-disarmed effect is described by the use of phenyl thioglycosides. The donor thioglycoside is fully protected with benzyl ethers while the acceptor thioglycoside contains benzyl ethers at position 2 and 3 and a strongly electron-withdrawing pentafluorobenzoate ester group at position 6. The coupling can be performed with galactose, glucose,
通过使用苯基硫糖苷描述了由武装-解除武装效应控制的选择性糖基化反应。供体硫糖苷被苄基醚完全保护,而受体硫糖苷在 2 位和 3 位包含苄基醚,在 6 位包含一个强吸电子的五氟苯甲酸酯基团。偶联可以用半乳糖、葡萄糖、甘露糖和邻苯二甲酰亚胺保护葡萄糖胺以良好的产率提供相应的 1,4-连接的二糖。如果添加另一个受体和更多的促进剂,这些二糖可以作为糖基供体在同一个锅中进行额外的偶联反应。这样,可以在一次操作中实现两次连续的糖基化以提供三糖。(© Wiley-VCH Verlag GmbH & Co. KGaA, 69451 Weinheim, Germany, 2007)