Crude Drugs from Aquatic Plants. I. On the Constituents of Alismatis Rhizoma. (1). Absolute Stereostructures of Alisols E 23-Acetate, F, and G, Three New Protostane-Type Triterpenes from Chinese Alismatis Rhizoma.
摘要:
从中国泽泻根茎(中国四川省采集的水生植物东方泽泻的干燥根茎(日文为 Sentaku))的极性较低的部分中,分离出了三种新的原烷型三萜类化合物,分别命名为泽泻醇 E 23-乙酸酯、F 和 G,以及四种愈创木型倍半萜类化合物和几种已知的三萜类化合物,包括 13,17-表紫苏醇 A。根据化学和物理化学证据,包括 E 23-乙酸烯醇、F 和 G 与已知三萜类烯醇 A 和 A 24-乙酸酯的化学相关性,以及应用改进的莫舍尔法,确定了 E 23-乙酸烯醇、F 和 G 的绝对立体结构。
An efficient glucosylation of alcoholic hydroxyls in the structures of protostane triterpenoids catalyzed by fungus has been developed. Four protostanes 1–4 as the substrates have been transformed by Syncephalastrum racemosum AS 3.264 and generated corresponding 11-OH glucosylation derivatives. The regioselective characteristics were also identified by various highly oxygenated protostane substrates