Synthesis and in vitro antibacterial activity of gemifloxacin derivatives containing a substituted benzyloxime moiety
摘要:
A series of novel gemifloxacin (GMFX) derivatives containing a substituted benzyloxime moiety with remarkable improvement in lipophilicity were synthesized. The target compounds evaluated for their in vitro antibacterial activity against representative strains. Our results reveal that most of the target compounds have considerable potency against all of the tested Gram-positive strains including MRSA and MRSE (MIC: <0.008-8 mu g/mL), although they are generally less active than the references against the Gram-negative strains. In particular, compound 111 (MIC: <0.008-4 mu g/mL) was found to be 8-2048 and 2-128 times more potent than levofloxacin (LVFX) and GMFX against the Gram-positive strains, respectively. Moreover, against MRSA clinical isolates, 111 (MIC90: 1 mu g/mL) is 8-fold more active than GMFX, and 2-fold more active than GMFX and moxifloxacin against MRSE clinical isolates (MIC90: 4 mu g/mL). Crown Copyright (C) 2012 Published by Elsevier Masson SAS. All rights reserved.
[18F]Fluoro-L-dopa, an important radiopharmaceutical for positron emission tomography (PET), has been synthesized using a phase-transfer alkylation reaction. A chiral quaternary ammonium salt derived from a Cinchonaalkaloid served as phase-transfer catalyst for the enantioselective alkylation of a glycine derivative. The active methylene group of this Schiff-base substrate was deprotonated with cesium hydroxide and
been synthesized with high enantiomeric purity (ee > 97%). These new radiopharmaceuticals for Positron Emission Tomography (PET), potential inhibitors of enzymatic functions, were regiospecifically labelled by nucleophilic substitution on trimethylammoniumbenzaldehyde triflate precursors 9. The [18F]fluoro aromatic aldehydes 12 obtained were easily converted to the corresponding [18F]fluorobenzyl halides
2-Aminopurine analogs having HSP90-inhibiting activity
申请人:Kasibhatla Rao Srinivas
公开号:US20050113340A1
公开(公告)日:2005-05-26
2-Aminopurine analogs are described and demonstrated or predicted to have utility as Heat Shock Protein 90 (HSP90) inhibiting agents in the treatment and prevention of various HSP90 mediated disorders, e.g., proliferative disorders. Method of synthesis and use of such compounds are also described and claimed.
2-Aminopurine Analogs Having HSP90-Inhibiting Activity
申请人:Kasibhatla Rao Srinivas
公开号:US20070185064A1
公开(公告)日:2007-08-09
2-Aminopurine analogs are described and demonstrated or predicted to have utility as Heat Shock Protein 90 (HSP90) inhibiting agents in the treatment and prevention of various HSP90 mediated disorders, e.g., proliferative disorders. Method of synthesis and use of such compounds are also described and claimed.
6-Fluorodihydroxyphenylalanines, a process for preparing and a pharmaceutical composition containing the same
申请人:Merck & Co., Inc.
公开号:EP0027993A1
公开(公告)日:1981-05-06
Novel 6-Fluorohydroxyphenylalanines, their preparation and pharmaceutical compositions containing the same are disclosed.
The novel 6-Fluorohydroxyphenylalanines have the formula
and pharmaceutically acceptable salts thereof wherein
R is H or CH3 and
R1 is H, C1-C18 alkyl or substituted C1-C3 alkyl.
本发明公开了新型 6-氟羟基苯丙氨酸、其制备方法以及含有这些物质的药物组合物。 新型 6-氟羟基苯丙氨酸具有如下式及其药学上可接受的盐 其中 R 是 H 或 CH3,R1 是 H、C1-C18 烷基或取代的 C1-C3 烷基。