New derivatives of saikosaponins.
作者:KOJI SHIMIZU、SAKAE AMAGAYA、YUKIO OGIHARA
DOI:10.1248/cpb.33.3349
日期:——
In the course of studies on the metabolism of saikosaponins, which are the main constituents of Bupleurum falcatum L., five new compounds derived from saikosaponins a, c and d were isolated after incubation with acid and snail enzyme. On incubation of saikosaponins a and c at 60°C in a 1 N sulfuric acid-dioxane solution, saikosaponins g and i possessing a homoannular diene moiety at C-9 (11), 12 were isolated, and their structures were elucidated as 3β, 16β, 23, 28-tetrahydroxyoleana-9 (11), 12-diene 3-O-β-D-glucopyranosyl-(1→3)-β-D-fucopyranoside and 3β, 16β, 28-trihydroxyoleana-9 (11), 12-diene 3-O-β-D-glucopyranosyl-(1→6)-[α-L-rhamnopyranosyl-(1→4)]-β-D-glucopyranoside, respectively. Furthermore, on incubation of saikosaponins b1, g and b2 with snail enzyme for 12h at 37°C, prosaikogenins A, H, and D were formed ; they were identified as the 3-β-D-fucopyranosides of saikogenins A, H and D.
在对柴胡皂苷(柴胡的主要成分)的新陈代谢进行研究的过程中,在用酸和蜗牛酶进行培养后,分离出了五种新的化合物,它们分别来自柴胡皂苷a、c和d。在1 N硫酸-二氧六环溶液中,将柴胡皂苷a和c在60°C下培养,分离出了柴胡皂苷g和i,它们在C-9(11)、12处具有同环二烯部分,其结构被确定为3β,16β,23,28-四羟基齐墩果-9(11),12-二烯3-O-β-D-吡喃葡萄糖基(1→3)-β-D-吡喃岩藻糖苷和3β,16β,28-三羟基齐墩果-9(11),12-二烯3-O-β-D-吡喃葡萄糖基(1→6)-[α-L-吡喃鼠李糖基(1→4)] -β-D-吡喃葡萄糖苷。此外,在37°C下用蜗牛酶将柴胡皂苷b1、g和b2培养12小时后,形成了原柴胡皂�