Synthetic Studies on Glycosphingolipids from Protostomia Phyla. Synthesis of a Glycosphingolipid Analogue from the Parasite Spirometra erinacei.
作者:Noriyasu HADA、Mayuko KURODA、Tadahiro TAKEDA
DOI:10.1248/cpb.48.1160
日期:——
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。