Process for the preparation of 9-fluoro-10-(4-methyl-1-piperazinyl)-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de][1,4]benzothiazine-6-carboxylic acid hydrochloride
申请人:MEDIOLANUM FARMACEUTICI s.r.l.
公开号:EP0522277A1
公开(公告)日:1993-01-13
Process for the preparation of 9-fluoro-10-(4-methyl-1-piperazinyl)-7-oxo-2,3-dihydro-7H-pyrido [1,2,3-de][1,4]benzothiazine-6-carboxylic acid hydrochloride (Rufloxacin) of formula (I) by reaction of 2,3,5-trifluoro-4-(4-methyl-1-piperazinyl)benzoyl ethyl acetate of formula (II) with N,N-dimethylformamide dimethylacetal, followed by reaction with 2-aminoethanethiol, intramolecular cyclization by treatment with NaH, hydrolysis with H₂O and salification with HCl.
通过将式(II)的2,3,5-三氟-4-(4-甲基-1-哌嗪基)苯甲酰乙酸乙酯与N,N-二甲基甲酰胺二甲基缩醛反应,然后与2-氨基乙硫醇反应,经NaH处理进行分子内环化,H₂O水解,最后用HCl盐化,制备式(I)的9-氟-10-(4-甲基-1-哌嗪基)-7-氧代-2,3-二氢-7H-吡啶[1,2,3-de][1,4]苯并噻嗪-6-羧酸盐(鲁氟沙星)的方法。