Four new norlignan glycoside isomers from the twigs of Cephalotaxus oliveri Mast.
摘要:
Four novel isomers of norlignan glycoside were isolated from Cephalotaxus oliveri Mast.. Their structures were elucidated as 3S-4 ''-O-beta-D-glucopyranosylnyasol 1, 3S-4'-O-beta-D-glucopyranosylnyasol 2, 3S-4 ''-O-beta-D-glucopyranosylhinoldresinol 3, 3S-4'-O-beta-D-glucopyranosylhinokiresinol 4 by extensive spectroscopic methods including I D and 2D NMR experiments (H-1, C-13, DEPT, H-1-H-1 COSY, HSQC, HMBC, ROESY) along with HR-ESIMS and comparison to literature data. Their absolute configurations were elucidated through CD spectra coupled with the quantum chemical CD calculations. (C) 2017 Elsevier Ltd. All rights reserved.
Structure and Absolute Configuration of Nyasol and Hinokiresinol via Synthesis and Vibrational Circular Dichroism Spectroscopy
作者:Peter R. Lassen、Dorthe Mondrup Skytte、Lars Hemmingsen、Simon Feldbæk Nielsen、Teresa B. Freedman、Laurence A. Nafie、S. Brøgger Christensen
DOI:10.1021/np0502995
日期:2005.11.1
The absoluteconfiguration of the norlignan (+)-nyasol was determined to be S by comparison of the experimental vibrational circulardichroism data with first-principle calculations taking into account the eight lowest energy conformations. The established absoluteconfiguration of (+)-nyasol enables establishment of the absoluteconfiguration of (-)-hinokiresinol, which is concluded to be S. A total
observed between the geometrical isomers and enantiomers. Among these, (3S)-cis-hinokiresinol displayed the highest activity, one order of magnitude greater than the activity of genistein. Furthermore, cis- and trans-hinokiresinol stimulated the proliferation of estrogen-dependent T47D breast cancer cells, and their stimulatory effects were blocked by an estrogen antagonist, indicating that the compounds