ABSTRACT
From an ethanol extract of Euphorbia micractina roots, sixteen terpenoids were isolated by a combination of various chromatographic techniques, including column chromatography over macroporous resin, silica gel, and Sephadex LH-20 and reversed-phase HPLC. Their structures were elucidated by spectroscopic data analysis as loliolide myristate (1), 24-methylenetirucall-8-en-3β,11α-diol-7-one (2), loliolide (3), 3β-hydroxy-5α,6α-epoxy-7-megastigmen-9-one (4), jolkinol A (5), jolkinol D (6), latilagascene F (7), helioscopinolide A (8), helioscopinolide B (9), 3-O-acetylhelioscopinolide B (10), helioscopinolide D (11), helioscopinolide E (12), (+)-11-acetoxyatis-16-en-3,14-dione (13), erythrodiol (14), uvaol (15) and betulin (16). All of the compounds were obtained from this plant for the first time, in which 1 and 2 are new compounds.
ABSTRACT
From an ethanol extract of Euphorbia micractina roots, seven steroids fifteen aromatic derivatives were isolated by a combination of various chromatographic techniques, including column chromatography over macroporous resin, silica gel, and Sephadex LH-20 and reversed-phase HPLC. Their structures were elucidated by spectroscopic data analysis as stigamast-5-ene-3beta, 7alpha-diol(1), stigamast-5-ene-3beta,7beta-diol(2), stigmast-5-en-3beta-ol-7-one(3), stigmast-4-en-6beta-ol-3-one(4), stigmast-1, 4-dien-3-one(5), stigmast-3,6-dione(6), beta-sitosterol(7), scopoletin(8), aesculetin(9), 6-hydroxy-5,7-dimethoxycoumarin(10), quercetin(11), 3,3', 4'-tri-O-methylellagic acid(12), p-hydroxyphenylethyl anisate(13), m-hydroxyphenylethyl alcohol(14), (E)-cinnamic acid(15), (E)-ferulic acid(16), 3,4-dihydroxybenzoic acid(17), vanillic acid(18), p-hydroxybenzoic acid(19), ethyl 3,4-dihydroxybenzoate (20), ethyl gallate(21), and methyl gallate(22). These compounds were obtained from this plant for the first time.