茄子根中主要的生物碱是具有支链四糖β- d -Glc p-(1→2)-β- d -Glc p-(1→3)[α- 1- Rha p-(1 )的Solaradixine。→2)]-β- d -Gal p与甾体生物碱Solasodine的O3相连。我们在本文中描述了使用超武装二糖作为供体分子合成四糖的甲基糖苷。在供体的合成中使用了2-(萘基)甲基保护基,因为它能耐受多种反应条件。6- Ø -benzylated-六Ø -叔避免了1,6-乙酰基形成的丁基丁基二甲基甲硅烷基保护的β- d -Glc p-(1→2)-β- d -Glc p -SEt供体在半乳糖苷受体分子的O3成功糖基化。然而,在随后的O2的糖基化通过一个鼠李糖基供体是不成功的,而是适当保护的α-升-RHA p - (1→2)-β- d -Gal p -OMe的二糖作为受体分子与超一起武装β- d -Glc p-(1→2)-β- d
Total Syntheses of Conjugation‐Ready Repeating Units of<i>Acinetobacter baumannii</i>AB5075 for Glycoconjugate Vaccine Development
作者:Shuo Zhang、Peter H. Seeberger
DOI:10.1002/chem.202103234
日期:2021.12.9
the repeatingunit of A. baumannii AB5075 as well as two analogues containing a challenging (S)-3-hydroxybutanoyl chain were synthesized. All of the oligosaccharides bear an amino group that allows for the covalent attachment to glycan microarrays and carrier proteins. These densely functionalized aminoglycoside trisaccharides are the basis for the development of novel glycoconjugatevaccines against
使用高效和立体选择性的糖基化和双序列倒置策略,合成了鲍曼不动杆菌AB5075 的重复单元以及含有具有挑战性的 ( S )-3-羟基丁酰基链的两个类似物。所有寡糖都带有氨基,可以共价连接到聚糖微阵列和载体蛋白上。这些密集功能化的氨基糖苷三糖是开发针对鲍曼不动杆菌的新型糖复合物疫苗的基础。
Total Synthesis of the<i>Escherichia coli</i>O111<i>O</i>-Specific Polysaccharide Repeating Unit
作者:Oliviana Calin、Steffen Eller、Heung Sik Hahm、Peter H. Seeberger
DOI:10.1002/chem.201204394
日期:2013.3.18
AbstractThe first total synthesis of the O‐antigen pentasaccharide repeating unit from Gram‐negative bacteria Escherichia coli O111 was achieved starting from four monosaccharide building blocks. Key to the synthetic approach was a bis‐glycosylation reaction to combine trisaccharide 10 and colitose 5. The colitose building block (5) was obtained de novo from non‐carbohydrate precursors. The pentasaccharide was equipped at the reducing end with an amino spacer to provide a handle for subsequent conjugation to a carrier protein in anticipation of immunological studies.