九龙藤中黄酮类化合物的研究

Flavonoids from Bauhinia championii Benth

从豆科植物九龙藤(Bauhinia championii Benth)的乙醇提取物中分离出7个已知黄酮类化合物,经过核磁共振谱(NMR)和质谱(MS)分析及标准品对照,鉴定了它们的结构,分别为:5,6,7,5′-四甲氧基-3′,4′-亚甲二氧基黄酮(1),5,6,7,3′,4′,5′-六甲氧基黄酮(2),5,7,3′,4′,5′-五甲氧基黄酮(3),5,6,7,3′,4′-五甲氧基黄酮(甜橙素)(4),5,7,4′-三甲氧基黄酮(5),5,7,3′,4′-四甲氧基黄酮(6),(-)-表阿夫儿茶素(7).其中化合物5,7为首次从该植物中分离得到.

Seven flavonoids are isolated from Leguminosae plant Bauhinia championii Benth.Their structures are identified as 5,6,7,5′-tetramethoxy-3′,4′-methylenedioxy flavone（1）,5,6,7,3′,4′,5′-hexamethoxy flavone（2）,5,7,3′,4′,5′-pentamethoxy flavone（3）,5,6,7,3′,4′-penta methoxy flavone（4）,5,7,4′-trimethoxy flavone（5）,5,7,3′,4′-tetramethoxy flavone（6）,and（-）-epiafzelechin（7）on the basis of spectral analysis and chemical methods.Among them,compounds 5 and 7 are obtained from this plant for the first time.