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Antibacterial Structure–activity Relationship Studies Of Several Tricyclic Sulfur-containing Flavonoids

Lucian G Bahrin, Henning Hopf, Peter G Jones, Laura G Sarbu, Cornelia Babii, Alina C Mihai, Marius Stefan, Lucian M Birsa

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A structure–activity relationship study concerning the antibacterial properties of several halogen-substituted tricyclic sulfur-containing flavonoids has been performed. The compounds have been synthesized by cyclocondensation of the corresponding 3-dithiocarbamic flavanones under acidic conditions. The influence of different halogen substituents on the antibacterial properties has been tested against Staphylococcus aureus and Escherichia coli. Amongst the N,N-dialkylamino-substituted flavonoids, those having an N,N-diethylamino moiety exhibited good to excellent antimicrobial properties against both pathogens. Fluorine-substituted flavonoids were found to be less active than those bearing other halogen atoms.