Four C-glucosylxanthones [Mangiferin (3), isomangiferin (2), 4 and 5] and three C-glucosylflavones [swertisin (6), isoswertisin (7) and isoswertiajaponin (8)] were isolated from the fresh leaves of Iris florentina L. (Iridaceae). The structures of 4 and 5 were shown to be 7-O-methylmangiferin and 7-O-methylisomangiferin, respectively, by chemical and spectroscopic methods. In addition, the 13C nuclear magnetic resonance chemical shifts of aryl carbons in these C-glucosylxanthones (2-5) were assigned. On the basis of the co-occurrence of several types of xanthone and flavone C-glucosides, the biosynthetic relationship between both C-glucosides is briefly discussed.
从鸢尾花新鲜叶中分离得到 4 种 C-
葡萄糖基
黄酮类化合物 [
芒果苷 (3)、
异芒果苷 (2)、4 和 5] 和 3 种 C-
葡萄糖基
黄酮类化合物 [獐牙菜甙 (6)、异甙
甲甙 (7) 和异獐牙甙苷 (8)]。 .(鸢尾科)。通过
化学和光谱方法表明4和5的结构分别为
7-O-甲基芒果苷和7-O-甲基
异芒果苷。此外,还指定了这些C-
葡糖基
呫吨酮(2-5)中芳基碳的13C核磁共振
化学位移。在几种
氧杂蒽酮和
黄酮C-
葡萄糖苷共存的基础上,简要讨论了这两种C-
葡萄糖苷之间的
生物合成关系。