Abstract
Novel fluoroquinolone-pyrazine conjugates 7a-h with amino acid linkers were synthesized in good yields utilizing benzotriazole chemistry. Antimicrobial bioassay showed that the synthesized bis-conjugates have antimicrobial properties comparable to the parent drugs. Compound 7h showed superior antibacterial activity against Staphylococcus aureus and Streptococcus pyogenes (MIC = 74.6 mu M and 149.3 mu M, respectively). This matched well with the estimated values obtained from 3D-pharmacophore and 2D-QSAR studies (MIC = 67 mu M and 92.9 mu M, respectively). (C) 2016 Elsevier Ltd. All rights reserved.