Along with the known hydrangenoside A (4), new glucosides of the same series, hydrangenosides B (1), C (2) and D (3), have been isolated from Hydrangea macrophylla and their absolute structures have been established. These substances are considered to be formed by an aldol-type condensation of secologanin (5) with a shikimate-malonate derived moiety followed by decarboxylation. Hydrangenoside A (4) and B (1) are stereoisomers, while hydrangenoside C (2) and D (3) are their homologues containing one fewer acetate unit and also are stereoisomers.
除了已知的
水合苷 A(4)之外,还从大绣球花中分离出了同系列的新苷类,即
水合苷 B(1)、C(2)和 D(3),并确定了它们的绝对结构。这些物质被认为是由 secologanin(5)与
莽草酸丙二酸衍生分子经醛醇型缩合后脱羧形成的。
水杨梅苷 A (4) 和 B (1) 是立体异构体,而
水杨梅苷 C (2) 和 D (3) 是它们的同源物,其中含有一个较少的
醋酸单元,也是立体异构体。