Synthesis of novel 15-membered 8a-azahomoerythromycin A acylides: Consequences of structural modification at the C-3 and C-6 position on antibacterial activity
作者:Dražen Pavlović、Scott Kimmins、Stjepan Mutak
DOI:10.1016/j.ejmech.2016.09.022
日期:2017.1
A novel series of 6-O-substituted 8a-aza-8a-homoerythromycin A 3-O-acylides has been discovered with potent activity against key respiratory pathogens, including those inducibly and constitutively resistant to erythromycin. The best compounds in this series 15na and 15nd showed activity comparable to telithromycin, especially against Haemophilus influenzae and constitutively MLSB-resistant strains
The rate of the nucleophilic displacement of the fluoro atom of 7-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylate could be enhanced either by the introduction of further fluoro atom(s) into position(s) 6 and/or 8, or by the formation of a boron chelate (e.g. 3). The regioselectivity of the nucleophilic substitution of the chloro atom in 1-substituted 6-fluoro-7-chloro-4-oxo-1,4-dihydroquinoline-3-carboxylic acids could also be enhanced by the formation of a boron chelate (e.g. 7).
Quinolone antibiotics: Study of reactivity and impurity profile of piperazine with chloro-fluoro-quinolone carboxylic acid in aqueous medium
The reaction of 7-chloro-1-cyclopropyl-6-fluoro-4-oxo-1,2-dihydroquinoline-3- carboxylic acid with piperazine in water was studied. The product ciprofloxacin was isolated and the impurity formed in the reaction was isolated and characterized as 1-cyclopropyl-7-chloro-6-piperazinyl-4-oxo-1,2-dihydroquinoline-3-carboxylic acid. Similarly norfloxacin was also synthesised. Copyright (C) 1996 Published by Elsevier Science Ltd
MACROLIDES
申请人:GLAXO GROUP LIMITED
公开号:EP1453846A1
公开(公告)日:2004-09-08
14 OR 15 MEMBERED MACROLIDES WITH ANTIBACTERIAL ACTIVITY