Synthesis and biological evaluation of novel 10-benzyl-substituted 4,5-dichloro-10H-anthracen-9-ones as inhibitors of keratinocyte hyperproliferation
作者:Ulrich Kratz、Helge Prinz、Klaus Müller
DOI:10.1016/j.ejmech.2010.08.047
日期:2010.11
A series of 10-substituted 4,5-dichloro-10H-anthracen-9-ones were synthesized in the search for novel agents against keratinocyte hyperproliferation. The antiproliferative activity of these novel anthrones was evaluated using the human keratinocyte line HaCaT as the primary test system. Structure-activity relationships with respect to the nature and position of the substituents at the benzyl moiety were studied, with a 3-hydroxy-4-methoxy-substitution pattern being the most potent (IC50 = 0.7 mu M) and comparable to the potency of the antipsoriatic anthralin. In contrast to anthralin, inhibition of keratinocyte hyperproliferation was not mediated by damage to the keratinocyte membrane, as the activity of lactate dehydrogenase released from the cytoplasm was in the control range. These findings may be rationalized as a benefit of the ineffectiveness of the novel anthrones to interact with the free radical 2, 2-diphenyl-1-picrylhydrazyl. (C) 2010 Elsevier Masson SAS. All rights reserved.
Implications of Unusual Population Ratios in Rotational Isomers of 9-(4-Substituted Benzyl)-8,13-dichloro-1,4-dimethyltriptycenes and 4-Substituted 9-Benzyl-8,13-dichloro-1-methyltriptycenes: CH<sub>3</sub>···π Hydrogen Bond
Population ratios of rotational isomers in substituted 9-benzyl-8,13-dichloro-1-methyltriptycenes were examined by equilibration in solution. The sc isomers increase in their populations as the electron density on the 9-benzyl group increases and the acidity of the 1-methyl group increases. The sc/ap ratios were larger than 2, the statistical value, in all the compounds examined, except the 4-nitrobenzyl