小叶杜鹃花的化学成分研究

Chemical constituents in flowers of Rhododendron lapponicum

目的研究小叶杜鹃Rhododendron lapponicum花的化学成分。方法采用硅胶柱色谱、反相高效液相色谱、葡聚糖凝胶色谱等方法进行分离纯化,根据理化性质和波谱技术手段鉴定化合物的结构。结果从小叶杜鹃花甲醇提取物中分离得到了13个化合物,分别鉴定为1,1,4a,6-四甲基-2,8-二羟基-2,3,4,4a,9,9a-1H-六氢二苯并吡喃-5-甲酸甲酯(1)、伞形花内酯(2)、莨菪亭(3)、4′,5,7-三羟基黄烷酮(4)、8-去甲杜鹃素(5)、杜鹃素(6)、槲皮素(7)、芦丁(8)、松树脂醇二甲醚A(9)、对羟基苯甲酸(10)、3,5-二羟基甲苯(11)、齐墩果烷(12)和曲酸(13)。结论化合物1为1个新化合物,为六氢二苯并吡喃类化合物,命名为小叶杜鹃素I;化合物9、11和13为首次从杜鹃属植物中分离得到。

Objective To study the chemical constituents in the flowers of Rhododenron parvifolium, which is a traditional Tibet medicine. Methods Silica gel column chromatography, HPLC, and Sephadex LH-20 column chromatography techniques were used for the separation and purification of the compounds. Their structures were determined on the basis of IR, MS, 1D, and 2D NMR spectral evidences. Results Thirteen compounds were isolated from methanol extract in the flowers of R. parvifolium, and their structures were identified as parvifoliumol I （1）, umbelliferone （2）, scopoletin （3）, 4＇, 5, 7-trihydroxyflavanone （4）, 8-demethylfarrerol （5）, farrerol （6）, quercetin （7）, rutin （8）, eudesmin A （9）, 4-hydroxybenzoic acid （10）, 3, 5-dihydroxy toluene （11）, oleanane （12）, and kojic acid （13）. Conclusion Compound 1 is a new compound, which has a hexahydroxanthene skeleton. Compounds 9, 11, and 13 are obtained from the plants of Rhododendron L. for the first time.