石胆草中黄酮碳苷的分离与结构鉴定石胆草中黄酮碳苷的分离与结构鉴定

目的研究石胆草(Corallodiscus flabellata)的化学成分。方法利用Diaion HP-20,Sephadex LH-20,硅胶柱等色谱技术分离,根据化合物的理化性质和光谱数据鉴定结构。结果从石胆草中分离并鉴定了7个化合物,分别为:5,3′,4′-三羟基-6,7-二甲氧基-8-C-［β-D-木糖-(1→2)］-β-D-葡糖黄酮碳苷(1);5,4′-二羟基-6,7-二甲氧基-8-C-［β-D-木糖-(1→2)］-β-D-葡糖黄酮碳苷(2);5,4′-二羟基-6,7-二甲氧基-8-C-β-D-葡糖黄酮碳苷(3);5,4′-二羟基-6,7-二甲氧基-8-C-［β-D-芹糖-(1→2)］-β-D-葡糖黄酮碳苷(4);3,4-二羟基-苯乙酸乙二醇酯(5);羟基酪醇(6);罗布麻宁(7)。结论化合物1和2为新化合物,其余化合物均系首次从该植物中分离得到。

Isolation and structural identification of C-glycosylflavones from Corallodiscus flabellata

AIM: To study the chemical constituents of Corallodiscus flabellata. METHODS: Fresh plant of Corallodiscus flabellata was extracted twice with boiling water, concentrated to small volume under reduced pressure at 55 degrees C. The concentrated material was partitioned with ether, ethyl acetate, and n-butanol. The fraction of ethyl acetate extract was chromatographed over macroporous adsorption resin (Diaion HP-20) eluted with a mixture of H2O and MeOH in increasing MeOH content. Their fractions from resin were repeatedly chromatographed over Sephadex LH-20, silica gel column chromatography. The compounds were identified on the basis of their physiochemical and spectral data. RESULTS: Seven compounds were obtained and identified as 5,3',4'-trihydroxyl-6,7-dimethoxyl-8-C-[beta-D-xylocopyranosyl-(1-->2)]- beta-D-glucopyranosyl flavone (1), 5,4'-dihydroxyl-6,7-dimethoxyl-8-C- [beta-D-xylopyranosyl-(1-->2)]-beta-D-glucopyranosyl flavone (2), 5,4'-dihydroxyl-6,7-dimethoxyl-8-C-beta-D-glucopyranosyl flavone (3), 5,4'-dihydroxyl-6,7-dimethoxyl-8-C-[beta-D-apiofuranosyl- (1-->2)]-beta-D-glucopyranosyl flavone (4), 3,4-dihydroxyl benzoyl acetic acid glycol ester (5), hydroxytyrosol (6), apocynin (7). CONCLUSION: Compound 1 and 2 are new compounds, the others were isolated from Corallodiscus flabellata for the first time.