A series of linear pentamidine analogs exhibiting low cytotoxicity, active against Pneumocystis carinii, were evaluated for in vitro activities against bacterial and fungal strains. The majority of the tested bis-amidines exhibited marked activities against Gram-positive strains. In view of the fact that the highest potency was found for 1,5-bis(4-amidinophenoxy)-3-thiapentane dihydrochloride 1j with the S atom in the middle of the aliphatic linker, four new pentamidines bearing S atoms were synthesized and also evaluated against MRSA strains. N,N'-Dialkylated pentamidines with S atoms in the linker are the promising lead structures for antimicrobials development. (C) 2014 Elsevier Ltd. All rights reserved.
Development of highly active anti-<i>Pneumocystis</i>bisbenzamidines: insight into the influence of selected substituents on the<i>in vitro</i>activity
作者:D. Maciejewska、J. Żabiński、M. Rezler、P. Kaźmierczak、M. S. Collins、L. Ficker、M. T. Cushion
DOI:10.1039/c7md00445a
日期:——
4-bis(methylene)piperazine derivatives 1–5; 2) alkanediamide derivatives 6–10; 3) alkane-derived bisbenzamidines 11–21. IC50 values of 18 compounds were lower than the IC50 of pentamidine. Four bisamidines were active at nanogram concentrations. Introduction of sulfur atoms in the alkane bridge, replacement of the amidino groups with imidazoline rings, or attachment of nitro or amino groups to the benzene