Synthesis of sulfated glucuronyl glycosphingolipids; carbohydrate epitopes of neural cell-adhesion molecules
作者:Takahisa Nakano、Yukishige Ito、Tomoya Ogawa
DOI:10.1016/0008-6215(93)84080-p
日期:1993.4
glycosphingolipids isolated from the human peripheral nervous system, HO3S-3-beta-GlcpA-(1-->3)-[beta-D-Galp-(1-->4)-beta-D-GlcpNA c-(1-->3)]n- beta-D-Galp-(1-->4)-beta-D-Glcp-(1-->1)-Cer (n = 1, 2) (1 and 2) were synthesized. The glycan part of target molecules was designed to be constructed from glucuronate, lactosamine, and lactose fragments 8, 9 (or 10), and 11, which in turn were synthesized stereo- and/or
从人外周神经系统HO3S-3-beta-GlcpA-(1-> 3)-[beta-D-Galp-(1-> 4)-beta-D-GlcpNA c- (1-> 3)] n- beta-D-Galp-(1-> 4)-beta-D-Glcp-(1-> 1)-Cer(n = 1,2)(1和2 )合成。目标分子的聚糖部分被设计为由葡萄糖醛酸酯,乳糖胺和乳糖片段8、9(或10)和11构成,而后者又是由容易获得的化合物立体和/或区域选择性合成的。通过三甲基甲硅烷基三氟甲磺酸酯(Me3SiOTf)的作用进行9与11之间的偶联反应,随后对产物31进行操作得到33。另一方面,对该序列进行了轻微修饰,包括使用10的重复糖基化反应,得到六糖46 。这些化合物在CuBr2-AgOTf-Bu4NBr的作用下与非还原性末端葡萄糖醛酸合成子8反应,并将得到的五糖和七糖分别转化为糖基氟化物34和47。与神经酰胺衍生物7最终偶联