The synthesis of the title compounds is described, i.e. coupling of the ylide, generated from the iodophosphonium salt of protected N-phthaloyl-D-galactosamine with 2,3-O-isopropylidene D-ribo-aldehyde afforded an undecose in high yield. Hydroboration-oxidation reaction of the olefinic linkage in the undecose led to the desired tunicamine, as the predominant product. After conversion of the latter
描述了标题化合物的合成,即,由保护的N-
邻苯二甲酰基-
D-半乳糖胺的
碘鎓盐与2,3-O-异亚丙基
D-核糖醛偶联生成的叶立德以高收率得到十一糖。
十一烷中的烯键的氢
硼化-氧化反应产生了作为主要产物的所需丁二胺。在后者转化为糖基受体之后,将其与完全保护的2-氧亚
氨基-2-脱氧-α-
D-阿拉伯糖基-己
吡喃糖基
溴组装,得到
海藻糖型α,β-二糖。