Synthesis of α- and β-linked tyvelose epitopes of the Trichinella spiralis glycan: 2-acetamido-2-deoxy-3-O-(3,6-dideoxy-d-arabino-hexopyranosyl)-β-d-galactopyranosides
作者:Mark A. Probert、Jian Zhang、David R. Bundle
DOI:10.1016/s0008-6215(96)00229-7
日期:1996.12
Abstract The anomeric configuration of tyvelose, 3,6-dideoxy- d -arabino-hexopyranose, in the recently discovered glycan epitopes of the parasite Trichinella spiralis has not been established. Two 2-(trimethylsilyl)ethyl disaccharide glycosides, α- and β-Tyv-(1 → 3)-β-d-GalNAc (4 and 5), have been synthesized to provide model compounds that, together with the methyl 3,6-dideoxy-α- and β- d -arabino-hexopyranosides
摘要尚未发现在最近发现的寄生旋毛虫旋毛虫的聚糖表位中,酪氨酸3,6-dideoxy-d-abino-hexopyranose的异头构型。已合成了两个2-(三甲基甲硅烷基)乙基二糖苷α-和β-Tyv-(1→3)-β-d-GalNAc(4和5),以提供模型化合物,该化合物与甲基3,6一起-二脱氧-α-和β-d-阿拉伯糖基己糖苷(2和3)可通过免疫化学抑制数据间接或直接通过1H NMR光谱技术确定寄生聚糖中酪糖残基的异头构型。甲基2,3-脱水-4,6-O-亚苄基-β-d-甘露吡喃糖苷(9)的合成方法是以前用的3,6-二脱氧-β-d-阿拉伯糖基吡喃糖苷(3)合成方法。 α端基2。2的苯甲酰化提供了通往糖基供体2,4-二-O-苄基-3,6-二脱氧-α-d-阿拉伯糖基-己吡喃糖基氯(30)的途径,该氯与选择性保护的2-acetamido-2反应-脱氧-d-吡喃半乳糖苷醇18在不溶性银沸石催化剂的存在下