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从苦楝(Azadirachta indica)叶中分离出1个新的四环三萜化合物(1)和1个已知化合物(3),并检测了其杀虫活性。 新鲜未碾碎的苦楝叶(20kg)室温下以甲醇反复提取,将甲醇粗提物在乙酸乙酯和水中分配。乙酸乙酯层以无水硫酸钠脱水,过活性炭。再依次以乙酸乙酯和苯-甲醇(1∶1)洗活性炭
A new tetracyclic triterpene compound (1) and a known compound (3) were isolated from the leaves of Azadirachta indica and tested for their insecticidal activity. Fresh unmilled buckwheat leaves (20 kg) were repeatedly extracted with methanol at room temperature and the crude methanol extract was partitioned between ethyl acetate and water. The ethyl acetate layer was dehydrated with anhydrous sodium sulfate and passed over activated carbon. Then wash activated carbon with ethyl acetate and benzene-methanol (1:1)