Abstract
Three sets of antibacterial nitrofuran derivatives [set I, 5-R-substituted (Z)-2-(5-nitrofuran-2-ylmethylene)-3(2H)-benzofuranones (R = OCH(3), H, CH(3), C(2)H(5), nC(3)H(7), Cl, Br, CN, and NO(2)) and their 2-hydroxyphenyl and 2-acetoxyphenyl analogues; set II, 5-R-substituted (E)-1-(2-hydroxyphenyl)-3-(5-nitrofuryl)-2-propen-1-ones (R = H, CH(3), C(2)H(5), Cl, and NO(2)); and set III, 5-R-substituted (E)-1-(2-acetoxyphenyl)-3-(5-nitrofuryl)-2-propen-1-ones (R = H, CH(3); C(2)H(5), Cl, and NO(2))] were prepared and tested against a Gram-positive (Staphylococcus aureus, strain ATCC-25923) and a Gram-negative bacterium (Caulobacter crescentus, strain NA 1000). QSAR equations derived for the IC(50) values against both bacteria show negative contributions of two terms: an electronic one, expressed either by sigma, the Hammett substituent constant, or by E, the cyclic voltametric reduction potential. Another term described by an indicator variable, I(abs), is assigned the value of 0 for set I compounds and the value of 1 for sets II and III. No important contribution of the hydrophobic factor was found. For the three sets, the QSAR regressions suggest that the same structural features describe the activities for both bacteria and t...Continue Reading
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