Pyridonecarboxylic Acids as Antibacterial Agents. Part XVI. Imidazo- and Triazoloquinolones as Antibacterial Agents. Synthesis and Structure-Activity Relationships.
The use of ILs instead of DMF in the Grohe cycloaracylation for the synthesis of pharmaceutically relevant quinolones has several advantages. [TBMA][MsO] was the most favourable IL and was used in a one‐pot/three‐step procedure for the preparation of a quinolone acid by a totally green procedure. Our procedure represents an alternative approach to the industrial production of quinolones.
Various 1-(substituted)-1,4-dihydro-6-nitro-4-oxo-7-(sub-secondary amino)-quinoline-3-carboxylic acids were synthesized from 2,4-dichlorobenzoic acid by six step synthesis. The compounds were evaluated for antimycobacterial in vitro and in vivo against Mycobacterium tuberculosis H37Rv (MTB), multi-drug resistant Mycobacterium tuberculosis (MDR-TB) and Mycobacterium smegmatis (MC2) and also tested for the ability to inhibit the supercoiling activity of DNA gyrase from M. smegmatis. Among the 48 synthesized compounds, 7-(4-((benzo[d][1,3]dioxol-5-yl)methyl)piperazin-1-yl)-1-cyclopropyl-1,4-dihydro-6-nitro-4-oxoquinotine-3-carboxylic acid (8c) was found to be the most active compound in vitro with MIC of 0.08 and 0.16 mu M against MTB and MDR-TB, respectively. In the in vivo animal model 8c decreased the bacterial load in lung and spleen tissues with 2.78 and 4.15-log 10 protections, respectively, at the dose of 50 mg/kg body weight. (C) 2008 Elsevier Masson SAS. All rights reserved.
Synthesis and amination of 1-alkyl-6-nitro-4-oxo-7-chloro-1,4-dihydroquinoline-3-carboxylic acids
作者:R. G. Glushkov、N. B. Marchanko、I. B. Levshin、L. N. Dronova