The first 6′-O-sulfated phenylanthraquinones: isolation from Bulbine frutescens, structural elucidation, enantiomeric purity, and partial synthesis
作者:Joan Mutanyatta、Merhatibeb Bezabih、Berhanu M. Abegaz、Michael Dreyer、Reto Brun、Nikolaus Kocher、Gerhard Bringmann
DOI:10.1016/j.tet.2005.06.055
日期:2005.8
From the roots of Bulbine frutescens, the first sulfated phenylanthraquinones were isolated, together with their known sulfate-free analogs. Their structures were elucidated by spectroscopic and chiroptical methods, by acid hydrolysis or by partial synthesis. The new compounds have the usual stereo-orientation at the biaryl axis (i.e., with the acetyl portion above the anthraquinone plane) except for
从Bulbine frutescens的根中分离出第一个硫酸化的苯基蒽醌及其已知的无硫酸盐类似物。通过光谱和手性方法,通过酸水解或通过部分合成来阐明它们的结构。这些新化合物具有除了钠通常的立体定向在联芳基轴(即,与蒽醌平面上方的乙酰部)ENT -knipholone 6'- ö -sulfate(因此,也其水解产物,耳鼻喉科-knipholone),其具有相反的轴向构型。我们还描述了天然苯基蒽醌的第一个立体分析,其中一些不对映体纯,有些甚至接近外消旋。此外,我们还报道了苯基蒽醌的首次X射线结构分析。4′- O-去甲基苯甲酮。