Synthesis of the Core Oligosaccharides of Lipooligosaccharides from
<i>Campylobacter jejuni</i>
: A Putative Cause of Guillain–Barré Syndrome
作者:Fumi Yoshida、Hiroki Yoshinaka、Hidenori Tanaka、Shinya Hanashima、Yoshiki Yamaguchi、Mikio Ishihara、Miyuki Saburomaru、Yuki Kato、Risa Saito、Hiromune Ando、Makoto Kiso、Akihiro Imamura、Hideharu Ishida
DOI:10.1002/chem.201804862
日期:2019.1.14
The chemical synthesis of the highly branched core oligosaccharides of lipooligosaccharides (LOSs) found in Campylobacter jejuni, which causes Guillain–Barré syndrome by a preceding infection, is described. The target LOS mimics, consisting of eight or nine monosaccharides, were classified into three groups as key building blocks: ganglioside‐core tetra‐/pentasaccharides (GM1‐/GD1a‐like), l‐glycer
描述了空肠弯曲菌中发现的脂多糖(LOSs)的高度分支核心寡糖的化学合成,空肠弯曲菌是由先前的感染引起的格林-巴利综合征。目标LOS模拟物,由八个或九个单糖,分为三组关键构建模块:神经节苷脂核心四/五糖(GM1- /神经节苷脂GD1a样),升-甘油基- d -甘露含-heptose-三糖和3-脱氧d -甘露-2-辛酮糖酸(KDO)残基。这些合成片段获自市售单糖。少获得升-甘油-d-甘露聚糖-庚糖和KDO残基是LOS的关键成分,分别由对甲氧基苯基d-甘露糖苷和二-O-异亚丙基保护的d-甘露糖合成。作为最困难的立体控制糖苷结构之一,α-KDO糖苷的合成是通过用苯硒基三氟甲磺酸酯作为合适的α导向剂处理KDO的2,3-烯衍生物来实现的。所有合成嵌段均通过融合合成路线构建而成,从而首次合成了具有神经节苷脂GM1和GD1a-核心序列的结构上具有挑战性的LOS核心聚糖。