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。
Alisol G, also named 25-anhydroalisol A, is a major triterpene obtained from dried rhizomes of Alisma orientalis. This paper investigated the transformation of alisol G by fungi and evaluated the hCE2 inhibitory effects of the transformed products. By screening whole cells of 10 strains of filamentous fungi, Penicillium janthinellum AS 3.510 exhibited a special capability to transform alisol G. Four metabolites were obtained, which were determined to be new compounds on the basis of spectroscopic data, including UV, 1D- and 2D-NMR, and HRESIMS. In addition, in an in vitro bioassay, metabolites 1-4 showed significant hCE2 inhibitory activities with IC50 values of 6.81, 16.66, 3.38, and 6.33 mu M, respectively. (C) 2015 Phytochemical Society of Europe. Published by Elsevier B.V. All rights reserved.