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。