A new tetrahydrofuranoid lignan, named (-)-berchemol (1), mp 188-189 °C, [α] D -7.9°, C20H24O7, was isolated together with a known lignan, (-)-secoisolariciresinol, from the stems of Berchemia racemosa SIEB. et ZUCC. (Rhamnaceae). The relative stereostructure of 1 was elucidated on the basis of chemical evidence, and spectroscopic and X-ray analysis. The absolute configuration of 1 was determined by comparison of its circular dichroism spectrum with that of (-)-olivil. (-)-Berchemol was determined to be (2R, 3S, 4S)-2, 4-bis(4-hydroxy-3-methoxyphenyl)-3-hydroxy-3-hydroxymethyltetrahydrofuran.
从 Berchemia racemosa SIEB. et ZUCC.(鼠李科植物)的茎中分离出一种新的四氢呋喃木质素,命名为 (-)-berchemol (1),熔点 188-189 °C,[α] D -7.9°,C20H24O7,与已知的木质素 (-)-secoisolariciresinol 一起。(鼠李科)的茎中分离出一种木质素和(-)-secoisolariciresinol。根据化学证据以及光谱和 X 射线分析,阐明了 1 的相对立体结构。通过比较 1 与 (-)-olivil 的圆二色光谱,确定了 1 的绝对构型。(-)-Berchemol 被确定为 (2R,3S,4S)-2,4-双(4-羟基-3-甲氧基苯基)-3-羟基-3-羟甲基四氢呋喃。
Biologically active phenols from Saussurea medusa
作者:Cheng-Qi Fan、Jian-Min Yue
DOI:10.1016/s0968-0896(02)00470-4
日期:2003.3
Sixteen phenolic compounds were isolated from the polar fraction of Saussurea medusa and were structurally elucidated by chemical evidences and spectral methods. These compounds include two new lignan glucosides, namely medusasides A (1) and B (2), and fourteen known phenolic compounds (3-16). One major compound, apigenin 7-O-[alpha-L-rhamnopyranosyl-(1-->6)-beta-D-glucopyranoside] (6) showed remarkable