Abstract
The synthesis and antifungal properties of a series of new N-aryl alpha,beta-substituted succinimides against a panel of dermatophytes of clinical relevance are reported. Among those compounds possessing a N-phenyl substituent, 7-thia-2-azabicyclo[2,2,1]hept-2-en-3-amine[5,6-c]succinimide was the better inhibitor of Trichophyton rubrum, the major ethiological agent of all infections produced by dermatophytes. In contrast, succinimides containing a N-(p-sulfonylphenyl) substituent, only inhibited Epidermophyton floccosum, all active compounds possessing an oxabicyclo group in positions alpha,beta of the imide. Substituents on the oxabicyclo group were important for the activity. Regarding the mechanism of action, N-(p-N'-4-methoxyphenylsulfamoylphenyl)-8-oxabicyclo[2,2,1]hept-4-en-3- methyl[5,6-c]succinimide produced a mottled inhibition halo in the Neurospora crassa assay, showing that it would act by inhibiting the synthesis or assembly of the fungal cell wall.
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