The structurally conserved lipopolysaccharide core region of many Gram-negative bacteria is composed of trisaccharides containing 4-O-phosphorylated l-glycero-d-manno-heptose (l,d-Hep) units, which act as ligands for antibodies and lectins. The disaccharides Glc-(1→3)-Hep4P Hep-(1→3)-Hep4P and Hep-(1→7)-Hep4P and the branched trisaccharide Glc-(1→3)-[Hep-(1→7)]-Hep4P, respectively, have been synthesized
许多革兰氏阴性菌的结构上保守的脂
多糖芯区域由含有4-三糖的ö
磷酸化的升-
甘油基- d -甘露-heptose(升,d -Hep)单元,其充当
配体抗体和凝集素。二糖 Glc-(1→3)-Hep4P Hep-(1→3)-Hep4P 和 Hep-(1→7)-Hep4P 和支链三糖 Glc-(1→3)-[Hep-(1→7) ]-Hep4P 分别由甲基
吡喃庚糖苷受体合成,步骤少于 10 步。合成策略基于在庚糖的 4 位提前引入
磷酸三酯,然后区域选择性地打开 6,7- O-(1,1,3,3-四异丙基-1,3-二
硅氧烷-1,3-二基) 基团允许直接进入第 7 位的糖基化。全苄基化N-苯基三
氟乙
酰亚胺葡萄糖基和庚糖基衍
生物作为 α-选择性糖基供体。