On the mode of action of a new antifungal antibiotic, pyrrolnitrin.
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The syntheses of all the possible 1-tolyl-3-nitrophenyl-5-methylpyrazole-4-carboxylic acids, 1-tolyl-3-methyl-5-nitrophenylprazole-4-carboxylic acids and of the corresponding carboxylates are reported. Several 1,3- and 1,5-diarylpyrazole derivatives were subjected to in vitro antibacterial screenings. Some acids showed activity against some strains of gram-positive bacteria. The results are discussed on the basis of structure-activity relationships.
From ethyl 1-aryl-2-methyl-4-(4-nitrophenyl)pyrrole-3-carboxylates new 1-aryl-2-methyl-4-(4-nitrophenyl)pyrrolderivatives wer prepared. These compounds and some previously reported 1,4- and 1,5-diarylpyrroles were subjected to in vitro antimicrobial screenings. Namely some 1-aryl-2-methyl-4-(4-nitrophenyl)pyrrole-3-carboxylic acids and its 5-chloroderivatives are the most potent. The results obtained are discussed on the basis of structure-activity relationships.