Department of Chemistry and Bioscience, Faculty of Science, Kagoshima University, 1-21-35 Korimoto, Kagoshima 890-0065, Japan.
Phytochemistry. 2011 Oct;72(14-15):1854-8. doi: 10.1016/j.phytochem.2011.05.014. Epub 2011 Jul 19.
Investigation of the root bark extract of Entandrophragma angolense led to identification of two gedunin-type limonoids 5-hydroxy-7-deacetoxy-7-oxogedunin and 5,6-dehydro-7-deacetoxy-7-oxogedunin, and three methyl angolensate derivatives, 6-deacetoxydomesticulide D, 6-deacetoxydomesticulide D 21-methylether, and entangosin, together with known compounds, methyl angolensate, 6-acetoxymethyl angolensate and secomahoganin. Their structures were established by extensive NMR experiments in conjunction with mass spectrometry. Entangosin is a rare example of a limonoid derivative having a fully O-substituted furan moiety.
研究安哥拉榄仁的根皮提取物，从中鉴定出两种吉墩果烷型柠檬苦素类化合物：5-羟基-7-去乙酰氧基-7-氧代吉墩果烷和 5,6-去氢-7-去乙酰氧基-7-氧代吉墩果烷，以及三种甲基榄仁烷酯衍生物：6-去乙酰氧基.domesticulide D、6-去乙酰氧基.domesticulide D 21-甲醚和 entangosin，此外还有已知化合物甲基榄仁烷酯、6-乙酰氧基甲基榄仁烷酯和 secomahoganin。它们的结构是通过广泛的 NMR 实验结合质谱确定的。Entangosin 是一个罕见的例子，它是一种完全 O-取代的呋喃部分的柠檬苦素衍生物。
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