Isolation and structural characterization of four diastereomeric lignan glycosides from Abies holophylla and their neuroprotective activity
作者:Joon Min Cha、Tae Hyun Lee、Lalita Subedi、Young Jun Ha、Hye Ryeong Kim、Sun Yeou Kim、Sang Un Choi、Chung Sub Kim
DOI:10.1016/j.tet.2020.131735
日期:2021.1
technique, we isolated four stereoisomeric lignan glycosides, holophyllosides A–D (1–4), from the trunk of Abies holophylla Maxim. which were first isolated as a mixture 25 years ago. The planar structures of 1–4 were characterized by conventional 1D and 2D NMR data analysis and their stereochemistry was determined via empirical comparison of their 13C NMR chemical shifts and 3JH-H coupling constants
非对映异构体是立体异构体的一种,由于其相似的物理性质,它们通常以混合物形式分离。通过HPLC技术,我们分离4个的立体异构体木脂素甙,holophyllosides A-d(1 - 4),从树干沙松马克西姆。于25年前首次分离为混合物。的平面结构1 - 4通过常规一维和二维NMR分析数据进行了表征,并经由它们的经验比较,确定其立体化学13个C NMR化学位移和3 Ĵ H-H耦合常数与报道的值,酶促水解,随后的LC-MS分析和ECD实验。中分离的四种立体异构体中,只有化合物1,3和4通过在C6细胞中诱导NGF分泌而表现出中等的神经保护活性2没有。这项研究再次强调了分子在其生物学和药学应用中的立体化学重要性。