Efficient Synthesis of 4-Amino-4-deoxy-l-arabinose and Spacer-Equipped 4-Amino-4-deoxy-l-arabinopyranosides by Transglycosylation Reactions
作者:Paul Kosma、Bernhard Müller、Markus Blaukopf、Andreas Hofinger、Alla Zamyatina、Helmut Brade
DOI:10.1055/s-0030-1258174
日期:2010.9
Methyl 4-azido-4-deoxy-β-l-arabinopyranoside has been synthesized in five steps starting from methyl β-d-xylopyranoside in a multigram scale without chromatographic purification in 78% overall yield. The transformation relied on selective tosylation/nosylation at O-4 followed by acylation, SN2 displacement with sodium azide, and subsequent deprotection. The methyl 4-azido-4-deoxy-arabinoside was then
甲基 4-叠氮基-4-脱氧-β - 1-阿拉伯吡喃糖苷以多克规模从甲基 β- d-吡喃木糖苷开始,分五步合成,无需色谱纯化,总产率为 78%。转化依赖于 O-4 处的选择性甲苯磺酰化/nosylation,然后是酰化,S N2 用叠氮化钠置换,然后去保护。甲基 4-叠氮基-4-脱氧-阿拉伯糖苷然后通过与相应醇的糖基转移以良好的产率和公平的异头选择性转化为烯丙基、丙烯基、ω-溴己基和氯乙氧基乙基间隔糖苷。叠氮基的还原和苷元的进一步转化提供了含 ω-硫醇的间隔衍生物。与马来酰亚胺激活的 BSA 偶联提供了一种有效的免疫原,用于产生与含有 4-氨基-4-脱氧-阿拉伯糖残基的 LPS 核心表位结合的鼠和兔多克隆血清。 氨基阿拉伯糖 - 新糖缀合物 - 转糖基化 - 脂多糖 - 间隔基