α-l-Fucp-(1→3)-d-GlcNAc, α-l-Fucp-(1→6)-[α-l-Fucp-(1→3)]-d-GlcNAc, and β-d-Galp-(1→3)-[α-l-Fucp-(1→4)]-d-GlcNAc were converted into corresponding β-glycopyranosylamines by action of ammonium carbamate in aqueous boric acid, or in aqueous methanol in case of α-l-Fucp-(1→6)-d-GlcNAc. N-Acylation of these fucooligosaccharides with N-Z-glycine N-hydroxysuccinimide ester (Z is benzyloxycarbonyl) followed by hydrogenolytic removal of Z-group afforded corresponding N-glycyl-β-glycopyranosylamines of these fucooligosaccharides; three of them model carbohydrate-peptide region of N-glycoproteins, and the forth is an amino-spacered Lea-antigen.
α-l-Fucp-(1→3)-d-GlcNAc, α-l-Fucp-(1→6)-[α-l-Fucp-(1→3)]-d-GlcNAc,和β-d-Galp-(1→3)-[α-l-Fucp-(1→4)]-d-GlcNAc 在
硼酸水溶液中,或在α-l-Fucp-(1→6)-d-GlcNAc 的
甲醇水溶液中,通过
氨基甲酸铵的作用转化为相应的β-
吡喃糖基胺。用 N-Z-甘
氨酸 N-羟基琥珀
酰亚胺酯(Z 为苄氧羰基)对这些岩藻
寡糖进行 N-酰化,然后氢解除去 Z 基,得到了这些岩藻
寡糖相应的 N-甘
氨酰-β-甘
氨酰
吡喃糖基胺;其中三个是 N-糖蛋白的
碳水化合物-肽区模型,第四个是有
氨基间隔的 Lea 抗原。