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Structure-Antibacterial Activity Relationships of N -Substituted-( d -/ l -Alaninyl) 1 H -1,2,3-Triazolylmethyl Oxazolidinones.
Scientia Pharmaceutica 2018 September 27
Bacterial resistance towards the existing class of antibacterial drugs continues to increase, posing a significant threat to the clinical usefulness of these drugs. These increasing and alarming rates of antibacterial resistance development and the decline in the number of new antibacterial drugs' approval continue to serve as a major impetus for research into the discovery and development of new antibacterial agents. We synthesized a series of d -/ l -alaninyl substituted triazolyl oxazolidinone derivatives and evaluated their antibacterial activity against selected standard Gram-positive and Gram-negative bacterial strains. Overall, the compounds showed moderate to strong antibacterial activity. Compounds 9d and 10d ( d - and l -alaninyl derivatives bearing the 3,5-dinitrobenzoyl substituent), 10e ( l -alaninyl derivative bearing the 5-nitrofurancarbonyl group) and 9f and 10f ( d - and l -alaninyl derivatives bearing the 5-nitrothiophene carbonyl moiety) demonstrated antibacterial activity (MIC: 2 µg/mL) against Staphylococcus aureus , Staphylococcus epidermidis , Enterococcus faecalis and Moraxella catarrhalis standard bacterial strains. No significant differences were noticeable between the antibacterial activity of the d - and l -alaninyl derivatives as a result of the stereochemistry of the compounds.
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