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.
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.
From the less polar fraction of Chinese Alismatis Rhizoma [the dried rhizome of the aquatic plant Alisma orientale JUZEP. collected in Szechwan Province, China (Sentaku in Japanese)], three new protostane-type triterpenes named alisols E 23-acetate, F, and G were isolated together with four guaiane-type sesquiterpenes and several known triterpenes including 13, 17-epoxyalisol A. The absolute stereostructures of alisols E 23-acetate, F, and G have been determined on the basis of chemical and physicochemical evidence, which included the chemical correlations of alisols E 23-acetate, F, and G with the known triterpenes alisols A and A 24-acetate, and the application of the modified Mosher's method.
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。
Highly regioselective glucosylation of alcoholic hydroxyls of protostane triterpenoids mediated by fungal biotransformation
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