Synthesis and Antitubercular Evaluation of<i>N</i>-Arylpyrazine and<i>N,N′</i>-Alkyl-diylpyrazine-2-carboxamide Derivatives
作者:Marcelle de Lima Ferreira Bispo、Raoni Schroeder Borges Gonçalves、Camilo Henrique da Silva Lima、Laura Nogueira de Faria Cardoso、Maria Cristina Silva Lourenço、Marcus Vinícius Nora de Souza
DOI:10.1002/jhet.921
日期:2012.11
Two series of pyrazinamide (PZA) derivatives have been synthesized and evaluated for their in vitro antibacterial activity against Mycobacterium tuberculosis H37Rv. Some compounds exhibited minimum inhibitory concentration activity of 50–100 μg/mL, greater than the first line antituberculosis drug PZA in Alamar Blue assay (>100 μg/mL). The obtained activities can be considered promising results, which
The first example of nickel(II)-catalyzed site-selective C–H bond trifluoromethylation of arylamine in water is established. In this transformation, a coordinatingactivation strategy is performed by the utilization of picolinamide as a directing group, and target products are obtained in moderate to good yields. In addition, the catalyst-in-water system can be reutilized eight times with a slight
Unsubstituted, halogenated and/or alkylated pyrazine-2-carboxylic acid amides connected via -CONH- bridge with substituted anilines were synthesized using currently known synthetic pathways. The synthetic approach, analytical, spectroscopic, lipophilicity and biological data of 20 newly synthesized compounds are presented. Structure-activity relationships among the chemical structures, the antimycobacterial, antifungal, photosynthesis inhibiting and antialgal activity of the evaluated substituted N-phenylpyrazine-2-carboxamides are discussed. 5-tert-Butyl-6-chloro-N-(3-trifluoromethylphenyl)pyrazine-2-carboxamide (19) has shown the highest activity against Mycobacterium tuberculosis H(37)Rv (MIC = 3.13 mu g/mL). The highest antifungal effect against Trichophyton mentagrophytes, the most susceptible fungal strain tested, was found for N-(3-trifluoromethylphenyl)pyrazine-2-carboxamide (14, MIC = 62.5 mu mol/mL). The highest reduction of chlorophyll content in Chlorella vulgaris was found for pyrazine-2-carboxylic acid (3-trifluoromethylphenyl)amide (9, IC50 = 12.1 mu mol/L). (C) 2007 Elsevier Masson SAS. All rights reserved.