作者:L. N. Atopkina、V. A. Denisenko
DOI:10.1007/s10600-019-02618-6
日期:2019.1
Condensation of 20S-protopanaxatriol (3β,6α,12β,20S-tetrahydroxydammar-24-ene) (1) with 2,3,4,6-tetra-O-acetyl-α-D-glucopyranosyl bromide (2) in the presence of Ag2O in CH2Cl2 gave a mixture of acetylated 3-, 12-, 20-, 3,12-di-, and 3,20-di-O-β-D-glucopyranosides 3–7 that was dominated by 3-O-β-Dglucopyranoside tetraacetate 3 (47%). Subsequent deacetylation by sodium methoxide produced free β-D-glucopyranosides 8–12, three of which were identical to chikusetsusaponin-L10, ginsenoside-F1, and ginsenoside-Ia, which were isolated earlier from leaves of Panax japonicus and P. ginseng. 3-Mono- and 3,12-di-O-β-D-glucopyranosides 8 and 11 were prepared for the first time.
在 Ag2O 存在下,20S-原人参三醇(3β,6α,12β,20S-四羟基达玛-24-烯)(1)与 2,3,4,6-四-O-乙酰基-α-D-吡喃葡萄糖溴化物(2)在 CH2Cl2 中缩合,得到乙酰化的 3-、12-、20-、3,12-二和 3,20- 二-O-β-D-吡喃葡萄糖苷 3-7 的混合物、12-、20-、3,12-二和 3,20- 二-O-β-D-吡喃葡萄糖苷 3-7 的混合物,其中以 3-O-β-D 吡喃葡萄糖苷四乙酸酯 3(47%)为主。随后用甲醇钠进行脱乙酰化,产生了游离β-D-吡喃葡萄糖苷 8-12,其中三个与早先从日本三七和人参叶中分离出的千层塔皂甙-L10、人参皂甙-F1 和人参皂甙-Ia 相同。首次制备了 3-甲基和 3,12- 二-O-β-D-吡喃葡萄糖苷 8 和 11。