Syntheses of repeating units of Escherichia coli capsular polysaccharides containing d-ribose and 3-deoxy-d-manno-2-octulosonic acid (KDO)
作者:Paul Kosma、Gerhard Schulz、Frank M. Unger
DOI:10.1016/0008-6215(84)85223-4
日期:1984.9
-2-octulopyranosid)onate in high purity and in acceptable over-all yields. They constitute a first series of model compounds for spectroscopic and immunochemical studies of the capsular polysaccharides from Escherichia coli strains LP 1092 and K 23. The essential, interglycosidic linkages [β- d -Rib f -(1→7)-α- or -β- d -dOclA, and β- d -Rib f -(1→2)-β- d -Rib f ] were formed by a modification of the
摘要寡糖,(3-脱氧-7-O-β-d-呋喃核糖基-β-d-甘露糖-2-辛基吡喃糖苷)钠,2- O-β-d-呋喃核糖基-β-d-呋喃呋喃糖苷,并从其中制备异头[甲基3-脱氧-7-O-(2-O-β-d-核呋喃糖基-β-d-核呋喃呋喃糖基)-α-和-β-d-甘露糖-2-辛基吡喃葡萄糖苷]。 1-O-乙酰基-2,3,5-三-O-苯甲酰基-β-d-核呋喃糖和异头甲基(甲基8-O-苄基-4,5-O-羰基-3-脱氧-α-和-β-d-甘露糖-2-辛基吡喃葡萄糖苷,纯度高,总收率令人满意。它们构成了第一系列模型化合物,用于光谱和免疫化学研究大肠杆菌菌株LP 1092和K 23的荚膜多糖。必不可少的糖苷间键[β-d -Rib f-(1→7)-α-或- β-d -dOclA,和β-d-Ribf-((1→2)-β-d-Ribf]通过使用适当的d-核呋喃糖基溴化物衍生物的三氟甲磺酸银方法的修饰而形成。组成和构型分配基于寡糖的受保护衍生物的250-MHz