First Synthesis of the β-<scp>d</scp>-Rhamnosylated Trisaccharide Repeating Unit of the <i>O</i>-Antigen from <i>Xanthomonas </i><i>c</i><i>ampestris </i>pv. <i>c</i><i>ampestris </i>8004
作者:Emiliano Bedini、Antonella Carabellese、Gaspare Barone、Michelangelo Parrilli
DOI:10.1021/jo051153d
日期:2005.9.1
The trisaccharide repeating unit of the O-antigen of the lipopolysaccharide from Xanthomonas campestris pv. campestris 8004, a pathogen of cruciferous crops, presents some structural features that renders it a challenging synthetic target: the presence of a β-d-rhamnosidic linkage, the steric crowd on a 1,2-cis-diglycosylated d-rhamnose, and finally the noncommercial availability of its monosaccharide
来自野油菜黄单胞菌(Xanthomonas campestris pv)的脂多糖的O-抗原的三糖重复单元。十字花科作物的病原体campestris 8004具有一些结构特征,使其成为具有挑战性的合成靶标:β- d-鼠李糖苷键的存在,1,2-顺式-二糖基化d-鼠李糖上的位阻分子,最后单糖成分的非商业可用性。这种三糖作为甲基糖苷的合成已经通过采用一种策略来完成,该策略的关键步骤是用2- O-苄基磺酰基-N依次进行β- d-鼠李糖基化反应-苯基三氟乙酰亚氨酸酯供体,脱苄基磺酰化,并与d -Fuc p 3NAc硫代糖苷供体偶联。