Novel neutral glycosphingolipids isolated from the plerocercoids of a tapeworm, Spirometra erinacei, may be expected to be involved in host-parasite interactions. We have synthesized this glycosphingolipid analogue containing 2-branched fatty alkyl residue in place of ceramide. Glycosylation of nonreducing-end trisaccharide derivative 15 with the reducing-end disaccharide derivative 17 in the presence of trimethylsilyl triflate (TMSOTf) gave the desired oligosaccharide derivative in good yield. The fully per-O-acylated 2-(trimethylsilyl)ethyl glycoside 19 was converted to glycosylimidate 20, which was condensed with 2-(tetradecyl)hexadecanol and subsequently deacylated to give the target glycosphingolipid analogue 22.
从寄生虫绦虫斯氏多头绦虫(Spirometra erinacei)的裂头蚴中分离得到的新的中性鞘
糖脂可能参与宿主-寄生虫相互作用。我们合成了这种含有2-支链
脂肪酸残基代替神经
酰胺的鞘
糖脂类似物。在三
甲基硅基
三氟甲磺酸酯(
TMSOTf)的存在下,非还原端三糖衍
生物15与还原端二糖衍
生物17进行糖基化反应,得到了高产率的目标
寡糖衍
生物。全O-酰化的2-(三
甲基硅基)乙基糖苷19被转化为糖基
亚胺20,后者与2-(
十四烷基)
十六烷醇缩合,随后
脱酰化得到目标鞘
糖脂类似物22。