A novel synthesis of colchicide and analogs from thiocolchicine and congeners: reevaluation of colchicide as a potential antitumor agent
作者:Raymond Dumont、Arnold Brossi、Colin F. Chignell、Frank R. Quinn、Matthew Suffness
DOI:10.1021/jm00387a028
日期:1987.4
Desulfurization of thiocolchicine with Raneynickel in a hydrogen atmosphere yielded tetrahydromethoxycolchicine (2), which was readily separated from unreacted thiocolchicine by chromatography and was smoothly oxidized to 10-demethoxycolchicine (colchicide) by Pd/C in refluxing toluene. Several analogues of colchicide were prepared from the corresponding thiocolchicines by this procedure. Treatment
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.