Process for preparing 6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid compounds

摘要

A novel process is described for preparing 6-fluoro-4-oxo-1,4-dihydroquinoline-3-carboxylic acid compounds of the general formula IV <IMAGE> in which R1 denotes an ethyl or vinyl group and R4 denotes the group <IMAGE> and R3 represents a hydrogen atom or a lower alkyl radical. The process is effected in accordance with the following reaction scheme: (formula I-IV) <IMAGE> [hydrolysis]