New "ofloxacin" type antibacterial agents. Incorporation of the spiro cyclopropyl group at N-1
作者:John S. Kiely、Mel C. Schroeder、Josephine C. Sesnie
DOI:10.1021/jm00118a026
日期:1988.10
The first example incorporating a spiro cyclopropyl group into an "ofloxacin" type of quinolone antibacterial agent has been prepared by potassium fluoride mediated ring closure of the hydroxymethyl cyclopropyl intermediate to give 9'-fluoro-7'-oxo-10'-(1-piperazinyl)spiro[cyclopropane-1,3'(2'H)-[7H] pyrido[1,2,3-de][1,4]benzoxazine]-6'-carboxylic acid. Analogues were made by substitution at C-7 by
Process for the preparation of 2,3,4,5-tetrafluorobenzoyl acetates
申请人:Warner-Lambert Company
公开号:US04689423A1
公开(公告)日:1987-08-25
An improved process for the preparation of methyl 2,3,4,5-tetrafluorobenzoylacetate is described. The process is for intermediates that lead to trifluoroquinolinic acids which in turn are used to produce antibacterial agents of the difluoro quinolinecarboxylic acid type. The process runs at room temperature, uses a safe and inexpensive base, and can be conveniently scaled up for manufacturing purposes.
Process for quinoline-3-carboxylic acid antibacterial agents
申请人:WARNER-LAMBERT COMPANY
公开号:EP0236673A2
公开(公告)日:1987-09-16
An improved process for the preparation of 7-substituted amino-l-alkyl- or cyclopropyl-6,8-difluoro-l,4-dihydro-4-oxo-3-quinolinecarboxylic acids is described where tetrafluorobenzoyl chloride is converted in three operations via l-alkyl or l-cycloalkyl-l,4-dihydro-6,7,8-trifluoro-4-oxo-quinoline-3-carbonitrile which in a separate step or in situ is displaced and hydrolyzed to the desired product.