Joziknipholones A and B: The First Dimeric Phenylanthraquinones, from the Roots ofBulbine frutescens
作者:Gerhard Bringmann、Joan Mutanyatta-Comar、Katja Maksimenka、John M. Wanjohi、Matthias Heydenreich、Reto Brun、Werner E. G. Müller、Martin G. Peter、Jacob O. Midiwo、Abiy Yenesew
DOI:10.1002/chem.200701328
日期:2008.2.8
recently revised absolute axial configuration of the parent phenylanthraquinones, knipholone and knipholone anthrone, the new dimers were attributed to possess the P-configuration (i.e., with the acetyl portions below the anthraquinone plane) at both axes in the case of joziknipholone A, whereas in joziknipholone B, the knipholone part was found to be M-configured. Joziknipholones A and B are active against
从非洲植物花椒(Bulbine frutescens)的根中,分离出两个前所未有的新颖的二聚苯基蒽醌,分别名为joziknipholones A和B,它们具有轴向和向心性,以及六个已知化合物。通过光谱学和手性学方法,通过用连二亚硫酸钠对单体苯基蒽醌和蒽酮部分之间的中心键进行还原性裂解,以及通过量子化学CD计算,实现了对新代谢产物的结构解析。根据最近修订的母体苯蒽醌,苯并酮和苯并蒽酮的绝对轴向构型,在二苯并二氢吡喃酮A的情况下,新的二聚体被认为在两个轴上均具有P-构型(即,乙酰基部分位于蒽醌平面以下)。 ,而在joziknipholone B中,发现knipholone部件是M构型的。Joziknipholones A和B对疟疾病原体恶性疟原虫的抗氯喹菌株K1有活性,对鼠类白血病淋巴瘤L5178y细胞显示中等活性。