Isoeucommiol 3, a cyclopentenoid-tetrol isomer of eucommiol 1, has been prepared by NaBH4 reduction of the hemiacetal moiety of aucubigenin 4a. The mechanism of this reduction has been investigated by using NaBD4.
Crystal Structure and Characterization of Iridoid Related Compound Isoeucommiol
作者:Yang Li、Ye Zhao、Guo-Ping Yang、Min-Juan Wang、Yong-Min Zhang、Wen-Ji Sun
DOI:10.1007/s10870-010-9857-9
日期:2011.2
A single crystal of iridoid relatedcompound isoeucommiol was obtained through NaBH4 reduction of aucubigenin which was formed by enzymatic hydrolysis of aucubin. Its structure and stereochemistry were determined by X-ray diffraction. The crystal adopts an envelope conformation, presenting a triclinic system, space group P1 with Z = 1, unit cell dimensions a = 5.4158(13) Å, b = 6.5251(15) Å, and c = 7
通过NaBH4还原桃红甙元酶水解形成的桃红甙元,得到环烯醚萜类化合物异丁香酚单晶。其结构和立体化学通过 X 射线衍射确定。该晶体采用包络构象,呈三斜晶系,空间群 P1,Z = 1,晶胞尺寸 a = 5.4158(13) Å,b = 6.5251(15) Å,c = 7.1555(17) Å。此外,在晶格中可以观察到广泛的分子间O-H···O氢键网络。图解摘要通过NaBH4还原桃红豆碱,得到异丁香酚单晶,并通过X射线衍射确定其结构和立体化学。
Organomercury chemistry of iridoid glucosides. 1. Chemoselective hydroxymercuration-demercuration of aucubin: a cheaper and efficient approach to epimeric isoeucommiols and 6,7-bis(hydroxymethyl)-cis-2-oxabicyclo[3.3.0]oct-7-enes