Esters of 1-O-Demethylthiocolchicines: Formation of Isomers in Chloroform Solution
作者:Peter Kerekes、Arnold Brossi、Judith L. Flippen-Anderson、Colin F. Chignell
DOI:10.1002/hlca.19850680306
日期:1985.5.15
standing in CHCl3 solution significant changes in optical rotation, a duplication of 1H-NMR signals, and the formation of new isomers on TLC. Solid-state X-ray diffraction of O-acetylated colchinoids and thio analogs, showed out of planar arrangements of the aromatic substituents, but the analysis could not help to explain the structures of the newly formed isomers in CHCl3 solution.
1- ø -乙酰-1- ø -demethylcolchicine,和酰化1- ö,2- Ó -didemethylthiocolchicines,而相比之下,2- Õ乙酰基,2- ö,3- ö -diacetyl-和3- ö -乙酰基类似物显示,在CHCl 3溶液中放置后,旋光度发生明显变化,1 H-NMR信号重复,并且在TLC上形成新的异构体。O-乙酰化类蛇蝎类和硫代类似物的固态X射线衍射显示出芳族取代基的平面排列,但该分析无法解释CHCl 3中新形成的异构体的结构 解决方案。