Synthesis and antibacterial evaluation of novel 8-fluoro Norfloxacin derivatives as potential probes for methicillin and vancomycin-resistant Staphylococcus aureus
摘要:
A series of novel 8-fluoro Norfloxacin derivatives and the hybrids of its piperazinyl derivatives incorporated with 1,3,5-triazine and pyrimidine were synthesized. All the above compounds were evaluated for their antibacterial activity against Klebsiella pneumoniae, methicillin-resistant Staphylococcus aureus and methicillin & vancomycin-resistant S. aureus. Among all, compounds having Morpholine, N-methyl/phenyl/benzyl/pyrimidinyl piperazines and n-butylamine substitution at C-7 position, have shown increased potency in comparison to norfloxacin and ciprofloxacin. (c) 2011 Published by Elsevier Masson SAS.
Novel Glycoconjugate of 8-Fluoro Norfloxacin Derivatives as Gentamicin-resistant<i>Staphylococcus aureus</i>Inhibitors: Synthesis and Molecular Modelling Studies
作者:Chandra S. Azad、Shome S. Bhunia、Atul Krishna、Praveen K. Shukla、Anil K. Saxena
DOI:10.1111/cbdd.12503
日期:2015.10
resistance Staphylococcusaureus. Among these compounds, the compound 10g showed better antibacterial activity (MIC = 3.12 μg/ml) than gentamicin (Escherichia coli (12.5 μg/ml), Staphylococcusaureus (6.25 μg/ml) and Klebsiella pneumonia (6.25 μg/ml), including gentamicin resistant (>50 μg/ml) strain in vitro). The docking studies suggest DNA gyrase of Staphylococcusaureus as a probable target for the
Human AfricanTrypanosomiasis, also known as African sleeping sickness, is caused by the parasitic protozoa of the genus Trypanosoma. If there is no pharmacological intervention, the parasites can cross the blood-brain barrier (BBB), inevitably leading to death of the patients. Previous investigation identified the quinolone amide GHQ168 as a promising lead compound having a nanomolar activity against
Thermochemical reaction of 7-azido-1-ethyl-6,8-difluoroquinolone-3-carboxylate with heterocyclic amines. An expeditious synthesis of novel fluoroquinolone derivatives
作者:Socorro Leyva、Elisa Leyva
DOI:10.1016/j.tet.2006.11.079
日期:2007.2
Novel 7-hydrazino-1-ethyl-6,8-difluoroquinolone-3-carboxylate derivatives are obtained by thermochemical reaction of 7-azido-1-ethyl-6,8-difluoroquinolone-3-carboxylate with heterocyclicamines. These new fluoroquinolone carboxylates could be used as precursors in the preparation of novel fluoroquinolone carboxylic acids. These latter compounds are known to have biological activity.
analogues of fluoroquinolone drugs, viz. 1-ethyl-7-piperidino-8-fluoroquinol-4-one-3-carboxylic acid and 1-ethyl-7-piperidino-6,8-difluoroquinol-4-one-3-carboxylic acids have been synthesized and their photochemistry has been investigated. Both compound undergo photoheterolysis of the C8F bond generating a triplet cation that either inserts into the 1-alkyl chain or is trapped or reduced by external nucleophiles
Tautomerism and acidity in 4-quinolone-3-carboxylic acid derivatives
作者:Angeles de la Cruz、José Elguero、Pilar Goya、Ana Martínez、Wolfgang Pfleiderer
DOI:10.1016/s0040-4020(01)89860-4
日期:1992.1
Prototropic tautomerism in 4-quinolone-3-carboxylic acid derivatives has been studied with particular emphasis on the influence of the ring substituents on the equilibrium. The techniques used include UV, 1H-NMR, 13C-NMR (solution and 13C-NMR CP/MAS (solid state) and semiempirical and ab initio calculations. The pKa values of some quinolone derivatives have been determined and correlated with data