A Novel Method for Constructing<i>β</i>-D-Mannosidic, 2-Acetamido-2-deoxy-<i>β</i>-D-mannosidic, and 2-Deoxy-D-<i>arabino</i>-hexopyranosidic Units from the Bis(triflate) Derivative of<i>β</i>-D-Galactoside
作者:Ken-ichi Sato、Akira Yoshitomo、Yoshimitsu Takai
DOI:10.1246/bcsj.70.885
日期:1997.4
An efficient construction of the β-d-mannosidic, 2-Acetamido-2-deoxy-β-d-mannosidic, 2-deoxy-2-fluoro-β-d-mannosidic, and 2-deoxy-β-d-arabino-hexopyranosidic units from the same intermediate, 2-4-bis(O-trifluoromethylsulfonyl) derivative of β-d-galactoside, was achieved in good yields in a stepwise inversion at C-4 and C-2 by using cesium acetate, n-Bu4NN3, n-Bu4NF, and n-Bu4NBH4. A convenient and practical protection of β-d-mannoside to the straightforward synthesis of antennary oligosaccharides was also achieved by using cesium trifluoroacetate.
通过使用乙酸铯、四丁基叠氮化铵、四丁基氟化铵和四丁基硼氢化铵,在逐步在C-4和C-2位进行反转的过程中,从同一中间体——β-D-半乳糖苷的2-4双(三氟甲磺酰基)衍生物出发,高效构建了β-D-甘露糖苷、2-乙酰氨基-2-脱氧-β-D-甘露糖苷、2-脱氧-2-氟-β-D-甘露糖苷以及2-脱氧-β-D-阿拉伯型己糖吡喃糖苷单元,并实现了良好的产率。同时,通过使用三氟乙酸铯,实现了β-D-甘露糖苷的方便且实用的保护,进而为支链寡糖的直接合成提供了便利。