Studies towards a Conjugate Vaccine for Anthrax: Synthesis of the Tetrasaccharide Side Chain of theBacillus anthracis Exosporium
作者:Roberto Adamo、Rina Saksena、Pavol Kováč
DOI:10.1002/hlca.200690106
日期:2006.6
The first synthesis of β-L-glycoside 17 of the tetrasaccharide β-Ant-(1 3)-α-L-Rhap-(1 3)-α-L-Rhap-(1 2)-L-Rhap is described (Schemes 1–3). Its spacer can be functionalized to make it amenable to conjugation to proteins by different conjugation methods. The synthesis was performed in a stepwise manner starting from the aglycon-bearing terminal saccharide with thioglycosides as glycosyl donors. To
的第一合成β -L糖苷17的四糖的β -Ant-(1 3) - α -L-鼠李对-(1→3) - α -L-鼠李对-(1 2)-L-鼠李p描述(方案1-3)。可以将其间隔物官能化以使其适于通过不同的缀合方法与蛋白质缀合。从带有糖苷配基的末端糖与硫糖苷作为糖基供体开始,以逐步的方式进行合成。为了连接上游末端蔗糖残基,用乙基4-叠氮基-3- O-苄基-2- O糖基化组装的连接子的三糖。-(溴乙酰基)-4,6-二脱氧-1-硫代-β -D-吡喃葡萄糖苷(11)。如此获得的四糖的进一步官能化,然后脱保护,得到目标物质17。具有相同间隔子的17个子结构的合成,即β -L-Rha p -1- O-(CH 2)5 COOMe(21),α -L-Rha p-(1 2)-β -L-Rha p -1- O-(CH 2)5 COOMe(22)和α -L-Rha p还描述了-(1 3)-α -L-Rha p-(1 2)-β