New derivatives of salicylamides: Preparation and antimicrobial activity against various bacterial species

Three series of salicylanilides, esters of N-phenylsalicylamides and 2-hydroxy-N-[1-(2-hydroxyphenylamino)-1-oxoalkan-2-yl]benzamides, in total thirty target compounds were synthesized and characterized. The compounds were evaluated against seven bacterial and three mycobacterial strains. The antimicrobial activities of some compounds were comparable or higher than the standards ampicillin, ciprofloxacin or isoniazid. Derivatives 3f demonstrated high biological activity against Staphylococcus aureus (<= 0.03 mu mol/L), Mycobacterium marinum (<= 0.40 mu mol/L) and Mycobacterium kansasii (1.58 mu mol/L), 3g shows activity against Clostridium perfringens (<= 0.03 mu mol/L) and Bacillus cereus (0.09 mu mol/L), 3h against Pasteurella multocida (<= 0.03 mu mol/L) and M. kansasii (<= 0.43 mu mol/L), 3i against methicillin-resistant S. aureus and B. cereus (<= 0.03 mu mol/L). The structure-activity relationships are discussed for all the compounds. (C) 2013 Elsevier Ltd. All rights reserved.