title: Synthesis and evaluation of antimicrobial activity of new 4-nitroso and 4-diazopyrazole derivatives.
abstract: Some N-(pyrazol-5-yl)-2-nitrobenzamides, variably substituted in the pyrazole nucleus as well as in the amidic group, were reacted in acetic acid media with potassium nitrite and hydrochloric acid. The different chemical behaviour of the reacted pyrazole derivatives in relation to the substitution pattern in both the pyrazole nucleus and the amidic group, was observed. All compounds isolated from the reaction mixtures (4-nitroso, 4-nitro, 4-diazo and 4-chloro derivatives) were evaluated by the agar diffusion method for their "in vitro" growth inhibitory activity against Candida albicans (our collection), Candida tropicalis ATCC 13803, Saccharomyces cerevisiae ATCC 36375, Escherichia coli ATCC 25922, Staphylococcus aureus ATCC 25923 and Pseudomonas aeruginosa ATCC 27853. The 1-methylpyrazole derivatives showed larger inhibition zones than the 1-phenyl ones in the antimicrobial tests.
authors.affiliation: Dipartimento di Chimica e Technologie Farmaceutiche Dell'Università Degli Studi, Palermo, Italia.
authors.forename: G
authors.initials: G
authors.lastname: Daidone
authors.forename: S
authors.initials: S
authors.lastname: Plescia
authors.forename: D
authors.initials: D
authors.lastname: Raffa
authors.forename: B
authors.initials: B
authors.lastname: Maggio
authors.forename: D
authors.initials: D
authors.lastname: Schillaci
mesh_terms: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D003979:Diazonium Compounds / Q000138:chemical synthesis* / Q000494:pharmacology; D005658:Fungi / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D008826:Microbial Sensitivity Tests; D009603:Nitroso Compounds / Q000138:chemical synthesis* / Q000494:pharmacology; D011720:Pyrazoles / Q000138:chemical synthesis*
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D003979:Diazonium Compounds; D009603:Nitroso Compounds; D011720:Pyrazoles