Further isolation work on the water-soluble fraction of a MeOH extract of Tricalysia dubia afforded one new megastigmane gentiobioside, named tricalysionoside A (1), and three sulfates, named sulfatricalysines A—C (2—4). Extensive isolation work on the 1-BuOH-soluble fraction of a MeOH extract of T. dubia yielded sulfatricalysines D—F (5—7) and three new ent-kaurane glucosides, named tricalysiosides X—Z (8—10). The structures of the new compounds were elucidated by analyses of one- and two-dimensional NMR spectroscopic data. The absolute stereochemistry of tricalysionoside A (1) was established by modified Mosher's method.
对杜氏三尖杉(Tricalysia dubia)的 MeOH
提取物中的
水溶性部分进行进一步的分离工作,得到了一种新的巨
石竹烯龙胆二糖苷,命名为三尖杉苷 A (1),以及三种
硫酸盐,命名为磺化三尖杉苷 A-C (2-4)。在对杜比阿藻的 MeOH
提取物中的 1-BuOH 可溶部分进行大量分离工作后,得到了
磺酸三嗪苷 D-F(5-7)和三种新的ent-kaurane
葡萄糖苷,命名为三尖杉苷 X-Z(8-10)。通过分析一维和二维核磁共振光谱数据,阐明了这些新化合物的结构。通过改进的 Mosher 方法确定了三嗪酰苷 A(1)的绝对立体
化学结构。