Absolute structure assignment of an iridoid-monoterpenoid indole alkaloid hybrid from Dipsacus asper
作者:Zhi-Pu Yu、Yin-Yin Wang、Shu-Juan Yu、Jie Bao、Jin-Hai Yu、Hua Zhang
DOI:10.1016/j.fitote.2019.04.015
日期:2019.6
indole alkaloid hybrids (IMIAHs) represent a rare class of natural products reported from only several plants of Rubiaceae and Dipsacaceae families, while their structural assignments remain a very challenging work due to complexity and flexibility. In the current study, a new IMIAH (1) was isolated from the roots of Dipsacus asper and its structure with absolute configuration was unambiguously established
虹彩-单萜类吲哚生物碱杂种(IMIAHs)代表罕见的一类天然产物,仅从茜草科和龙脑科的几种植物中报告,而由于复杂性和灵活性,它们的结构分配仍然是一项非常具有挑战性的工作。在当前的研究中,从Dipsacus asper的根中分离出一种新的IMIAH(1),并通过光谱分析,化学降解和ECD计算的组合,明确地确定了其具有绝对构型的结构。还获得了新的齐墩果烷型三萜皂苷(2)和15种已知的共代谢物,并对其结构进行了表征。我们的生物学评估表明,化合物2对乙酰胆碱酯酶(AChE)表现出中等抑制作用,IC50值为15.8±0.56μM,