Synthesis, Antimycobacterial Activity and In Vitro Cytotoxicity of 5-Chloro-N-phenylpyrazine-2-carboxamides

Molecules

Jan Zitko²  Barbora Servusová²  Pavla Paterová¹  Jana Mandíková²  Vladimír Kubíპk²  Radim Kuპra²  Veronika Hrabcová³  Jiří Kuneš²  Ondᖞj Soukup³ 

[1] Department of Clinical Microbiology, University Hospital, Sokolská 581, Hradec Králové 500 05, Czech Republic; E-Mail:;Faculty of Pharmacy in Hradec Králové, Charles University in Prague, Heyrovského 1203, Hradec Králové 500 05, Czech Republic; E-Mails:;Biomedical Research Center, Sokolská 581, Hradec Králové 500 05, Czech Republic; E-Mails:

关键词: pyrazinamide;    5-chloropyrazinamide;    anilides;    antimycobacterial activity;    cytotoxicity;   

DOI  :  10.3390/molecules181214807

来源: mdpi

【 摘 要 】

5-Chloropyrazinamide (5-Cl-PZA) is an inhibitor of mycobacterial fatty acid synthase I with a broad spectrum of antimycobacterial activity in vitro. Some N-phenylpyrazine-2-carboxamides with different substituents on both the pyrazine and phenyl core possess significant in vitro activity against Mycobacterium tuberculosis. To test the activity of structures combining both the 5-Cl-PZA and anilide motifs a series of thirty 5-chloro-N-phenylpyrazine-2-carboxamides with various substituents R on the phenyl ring were synthesized and screened against M. tuberculosis H37Rv, M. kansasii and two strains of M. avium. Most of the compounds exerted activity against M. tuberculosis H37Rv in the range of MIC = 1.56–6.25 µg/mL and only three derivatives were inactive. The phenyl part of the molecule tolerated many different substituents while maintaining the activity. In vitro cytotoxicity was decreased in compounds with hydroxyl substituents, preferably combined with other hydrophilic substituents. 5-Chloro-N-(5-chloro-2-hydroxyphenyl)pyrazine-2-carboxamide (21) inhibited all of the tested strains (MIC = 1.56 µg/mL for M. tuberculosis; 12.5 µg/mL for other strains). 4-(5-Chloropyrazine-2-carboxamido)-2-hydroxybenzoic acid (30) preserved good activity (MIC = 3.13 µg/mL M. tuberculosis) and was rated as non-toxic in two in vitro models (Chinese hamster ovary and renal cell adenocarcinoma cell lines; SI = 47 and 35, respectively).

【 授权许可】

CC BY   
© 2013 by the authors; licensee MDPI, Basel, Switzerland.