Phytochemical investigation of the roots of Calophyllum blancoi growing in Taiwan resulted in the isolation of three new pyranoxanthones, blancoxanthone (1), acetyl blancoxanthone (2) and 3-hydroxyblancoxanthone (3), in addition to two known pyranoxanthones, pyranojacaeubin (4) and caloxanthone (5). Structural characterization of the isolated compounds was determined by spectral analyses especially 2-D NMR. Biological study of the isolated xanthones revealed that blancoxanthone (1) exhibited significant anti-coronavirus activity.
通过对生长在台湾的白叶
钙叶菊根部进行植物
化学研究,分离出了三种新的
吡喃
氧杂蒽酮,分别是白叶
钙叶菊酮(1)、乙酰白叶
钙叶菊酮(2)和3-羟基白叶
钙叶菊酮(3),以及两种已知的
吡喃
氧杂蒽酮,即
吡喃
栀子苷(4)和
钙叶
钙叶菊酮(5)。通过光谱分析,特别是二维核磁共振,确定了分离化合物的结构特征。对分离出的
氧杂蒽酮进行的
生物学研究表明,blancoxanthone(1)具有显著的抗冠状病毒活性。