Synthesis and Biological Activity of Fluorinated Combretastatin Analogues
摘要:
With the aim of understanding the influence of fluorine on the double bond of the cis-stilbene moiety of combretastatin derivatives and encouraged by a preliminary molecular modeling study showing a different biological environment on the interaction site with tubulin, we prepared, through various synthetic approaches, a small library of compounds in which one or both of the olefinic hydrogens were replaced with fluorine. X-ray analysis on the difluoro-CA-4 analogue demonstrated that the spatial arrangement of the molecule was not modified, compared to its nonfluorinated counterpart. SAR analysis confirmed the importance of the cis-stereochemistry of the stilbene scaffold. Nevertheless, some unpredicted results were observed on a few trans-fluorinated derivatives. The position of a fluorine atom on the double bond may affect the inhibition of tubulin polymerization and cytotoxic activity of these compounds.
Hydrofluorination of Alkynes Catalysed by Gold Bifluorides
作者:Fady Nahra、Scott R. Patrick、Davide Bello、Marcel Brill、Alan Obled、David B. Cordes、Alexandra M. Z. Slawin、David O'Hagan、Steven P. Nolan
DOI:10.1002/cctc.201402891
日期:2015.1
N‐heterocyclic carbene goldbifluoride complexes starting from the corresponding N‐heterocyclic carbene gold hydroxides. A new methodology to access N,N′‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene gold(I) fluoride starting from N,N′‐bis(2,6‐diisopropylphenyl)imidazol‐2‐ylidene gold(I) hydroxide and readily available potassium bifluoride is also reported. These goldbifluorides were shown to be efficient