Synthesis of alternate linear and branched repeating units of the Escherichia coli LP 1092 capsular polysaccharide containing 3-deoxy-α-d-manno-2-octulosonic acid (KDO) linked to secondary positions of d-ribose
作者:Paul Kosma、Rudolf Christian、Gerhard Schulz、Frank M. Unger
DOI:10.1016/s0008-6215(00)90455-5
日期:1985.9
purity and good over-all yields. The constitutions of the trisaccharide derivatives correspond to the repeating units of the proposed linear and branched structures of the capsular polysaccharide(s) from Escherichia coli LP 1092. The alpha-KDO-(2----3)-beta-D-Ribf and alpha-KDO-(2----2)-beta-D-Ribf units were synthesized by a modification of the Helferich procedure using methyl (4,5,7,8-tetra-O-acetyl
寡糖,3-O-(3-脱氧-α-D-甘露糖-2-辛基吡喃果糖酸钠)-β-D-呋喃呋喃糖苷e,甲基2-O-β-D-呋喃呋喃糖基-3-O-(钠3 -脱氧-α-D-甘露糖-2-辛基吡喃磺酸钠)-β-D-呋喃呋喃糖苷e和甲基O-(3-脱氧-α-D-甘露糖-2-辛基吡喃磺酸钠)-(2 ---- 2)以高纯度和良好的整体收率制备了-O-β-D-呋喃呋喃糖基-(1 ---- 2)-β-D-呋喃呋喃糖苷。三糖衍生物的组成对应于大肠杆菌LP 1092荚膜多糖的线性和支链结构的重复单元。alpha-KDO-(2 ---- 3)-beta-D-Ribf和α-KDO-(2 ---- 2)-β-D-Ribf单元是通过修改Helferich程序并使用甲基(4,5,7,8-四-O-乙酰基-3-脱氧-α-D-甘露糖-2-辛基吡喃糖基溴化物)-酸酯和适当的β-D-核呋喃糖基衍生物。组成和构型分配基于寡糖的受保护衍生物的250-MHz