摘要
前已报道从罗汉松科罗汉松属植物长叶竹柏(Podocarpus,zleuryi Hickle) 中分得11种成分并测定了结构。本文报道另一个微量新的双黄酮成分(Ⅰ)的结构。长叶竹柏枝叶的醋酸乙酯提取部分经反复硅胶柱层析,得到10m g黄色粉末状晶体(Ⅰ),mp>320℃。Ⅰ用(CH_3)_2SO_4/NaOH 全甲基化,得到 robustaflavone-六甲醚(Ⅱ),证明Ⅰ的双黄酮连接方式为3′-6″,基本骨架为 robustaflavone 型.Ⅰ以 Ac_2O/Py 常法乙酰化,得到五乙酰物(Ⅲ)。
Continuing the former report,another new minor biflavone was isolated.Its structure was assigned as robustaflavone-7-methyl ether(1)by means of chemical reaction and lower shift of acetylation in ~1HNMR.
关键词
长叶竹柏
双黄酮
Podocarpus fleuryi
Robustaflavone-7″-methyl ether
