Abstract
The synthesis, in vitro antifungal evaluation and structure-activity relationship studies of 14 compounds of the N-phenyl-, N-aryl-, N-phenylalkyl- maleimide and 3,4-dichloromaleimide series are reported. The compounds were evaluated against a panel of standardized yeasts and filamentous fungi as well as clinical isolates of Candida albicans. The activities of N-phenylalkyl-3,4-dichloromaleimide derivatives but not those of N-phenylalkyl-maleimide derivatives showed to be dependent on the length of the alkyl chain. N-Phenylpropyl-3,4-dichloromaleimide showed the broadest spectrum of action and lower minimal inhibitory concentrations (MIC) in all of the fungi tested. The nitrogen-carbon distance between the two rings seems to play an important role in the antifungal behavior of these compounds. The most active structure showed inhibited (1,3)beta-D-glucan and chitin synthases, enzymes that catalyze the synthesis of the major fungal cell-wall polymers.
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