Synthesis of Neoglycoconjugates Containing 4-Amino-4-deoxy-L-arabinose Epitopes Corresponding to the Inner Core of Burkholderia and Proteus Lipopolysaccharides
作者:Markus Blaukopf、Bernhard Müller、Andreas Hofinger、Paul Kosma
DOI:10.1002/ejoc.201101171
日期:2012.1
spacer glycosides, which were efficiently coupled to maleimide-activated bovine serum albumin. The neoglycoconjugates serve as immunoreagents with specificity for inner core epitopes of Burkholderia and Proteus lipopolysaccharides.
摘要 含有 3-deoxy-d-manno-oct-2-ulosonic acid (Kdo) 和 d-glycero-d-talo-oct-2-ulosonic acid (Ko) 8 位被 4-氨基取代的二糖。已制备 4-脱氧-β-1-阿拉伯吡喃糖基 (Ara4N) 残基。将 N-苯基三氟乙酰亚胺酸酯-4-叠氮基-4-脱氧-1-阿拉伯糖基糖基供体偶联到 Kdo 和 Ko 的乙酰基保护的烯丙基糖苷上,分别以 74% 和 90% 的产率提供了二糖产物的异头混合物,通过色谱法将其分离。中间体 Ara4N-(1→8)-Kdo 二糖受体的进一步延伸,利用与 Kdo 溴化物供体在 Helferich 条件下的区域选择性糖基化,提供支链三糖 α-Kdo-(2→4)[β-l- Ara4N-(1→8)]-α-Kdo 衍生物。受保护的二糖和三糖烯丙基糖苷的脱保护是通过 TiCl4 促进的苄醚裂解来完成的,