The invention relates to a method of preparation of fluoroquinolones of formula (I) from compounds of formula (II):
in which R
1
, R
2
, R
3
, R
4
, R
5
, R
6
, R
7
, and X are as defined in Claim
1.
Photoreactivity of Fluoroquinolones: Nature of Aryl Cations Generated in Water
作者:Sonia Soldevila、Francisco Bosca
DOI:10.1021/ol301694p
日期:2012.8.3
The nature of stabilized aryl cations generated from photodehalogenations of fluoroquinolones in aqueous media has been studied by comparing the photophysical and photochemical behavior of lomefloxacin (LFX) and its N(4′)-acetylated form (ALFX). Photoproduct studies, laser flash photolysis, and emission measurements have shown that this small peripheral modification produces important changes in the
Irradiation of the 6,8-difluoroquinolone antibiotic lomefloxacin causes
selective heterolytic defluorination from position 8 and leads to products
rationalized as arising from the cation either via nucleophile
addition or intramolecular carbene C–H insertion and hydrogen
transfer.
Synthesis and biological activity of 5-amino- and 5-hydroxyquinolones, and the overwhelming influence of the remote N1-substituent in determining the structure-activity relationship
作者:John M. Domagala、Alex J. Bridges、Townley P. Culbertson、Laura Gambino、Susan E. Hagen、Gregory Karrick、Kenneth Porter、Joseph P. Sanchez、Josephine A. Sesnie
DOI:10.1021/jm00107a039
日期:1991.3
A series of 5-amino- and 5-hydroxyquinolone antibacterials substituted at C7 with a select group of common piperazinyl and 3-aminopyrrolidinyl side chains was prepared. These 5-substituted derivatives were compared to the analogous 5-hydrogen compounds for antiinfective activity by using DNA gyrase inhibition, minimum inhibitory concentrations against a variety of bacteria, and in vivo efficacy in the mouse infection model. The influence on the structure-activity relationships of varied substituents at C8 (H, F, Cl) and Ni (ethyl, cyclopropyl, difluorophenyl) was also studied. The results showed that several of the structure-activity conclusions regarding side-chain bulk at C7, the effect of halogen at C8, and the effect of the C5-amino group were greatly influenced by the choice of the N1-substituent. Several outstanding broad spectrum quinolones were identified in this work. In particular, the spectrum and potency of the 7-piperazinyl quinolones could be greatly enhanced by the judicious choice of C5-, C8-, and N1-substitutents.
DOMAGALA, JOHN M.;BRIDGES, ALEX J.;CULBERTSON, TOWNLEY P.;GAMBINO, LAURA;+, J. MED. CHEM., 34,(1991) N, C. 1142-1154
作者:DOMAGALA, JOHN M.、BRIDGES, ALEX J.、CULBERTSON, TOWNLEY P.、GAMBINO, LAURA、+