The useful constructions of β-d-mannosidic, 2-acetamido-2-deoxy-β-d-mannosidic, and 2-deoxy-β-d-arabino-hexopyranosidic units from the same intermediate, 2,4-bis(O-trifluoromethanesulfonyl) derivative of β-d-galactoside, were achieved in a stepwise inversion at C-4 and C-2 by using cesium acetate, Bu4NBH4 and Bu4NN3 in good yields. Convenient and practical protections of β-d-mannoside to the straightforward synthesis of antennary oligosaccharides also achieved by using cesium trifluoroacetate.
通过使用
乙酸铯、四丁基氢化
铵和四丁基
叠氮化
铵,成功实现了β-d-
甘露糖苷、2-乙酰
氨基-2-脱氧-β-d-
甘露糖苷和2-脱氧-β-d-
阿拉伯糖六烷基苷的有用构建,这些反应均从相同的中间体:β-d-半
乳糖苷的2,4-双(O-
三氟甲烷磺酰)衍
生物出发,经过对C-4和C-2的逐步反转获得高产率。此外,通过使用
三氟乙酸铯方便且实用地对β-d-
甘露糖苷进行了保护,为简单合成分支
寡糖提供了便利。