Colchicine red-ox chemistry revisited: Cathodic behavior and EPR observation of an intermediate radical anion
摘要:
Colchicine (1), a potently antimitotic alkaloid and useful laboratory tool in cancer research, undergoes cathodic reduction in DMF forming an ESR-observable radical anion (1r) which is characterized by the isotropic hyperfine coupling constants 8.9, 4.3, 0.75, 0.49 and 0.48 G for H-8, H-12, OCH3, H-11 and H-4, respectively, and a much flattened troponoid ring. Assignments are aided by selective deuteriation of colchicine at C-8, C-11 and COCH3, as well as by spectral simulation and ab initio calculations of electron spin densities. Whether the colchicine radical anion may exist in nature is also discussed. (C) 1999 Elsevier Science Ltd. All rights reserved.
Synthesis and tubulin binding of novel C-10 analogs of colchicine
作者:Marianne E. Staretz、Susan Bane Hastie
DOI:10.1021/jm00058a013
日期:1993.3
10-fluoro-10-demethoxycolchicine (9) without concomitant formation of ring contraction products. Compound 9 is prepared by reaction of (diethylamino)sulfurtrifluoride with colchiceine. Unlike most reactions of colchiceine, the colchicine rather than the isocolchicine regiosiomer is the predominant product of this reaction. It was found that modification of the C-10 substituent of colchicine had a relatively
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
A colchicine derivative, previously isolated from the reaction of isocolchicine with sodium thiomethoxide in aqueous MeOH, was now identified as 11-(methylthio)isocolchicine on the basis of 1H-, 13C-NMR spectra and chemical correlation. This reaction represents the first example of abnormal nucleophilic displacement (telesubstitution) in the colchicine chemistry.
The present invention relates to tricyclic colchicine derivatives represented by the formulas (I) or (II), pharmaceutically acceptable salts thereof, and a method for providing an immuno-suppressive or immuno-modulating effect, an anti-proliferative effect, an anti-inflammatory effect or a method for treating cancer comprising administering to a patient an effective amount of one or more colchicine derivatives: