申请人:——
公开号:US20030130507A1
公开(公告)日:2003-07-10
Levofloxacin was prepared by reacting (S)-(−)-9,10-difluoro-3-methyl-7-oxo-2,3-dihydro-7H-pyrido[1,2,3-de][1,4]benzoxazine-6-carboxylic acid with N-methyl piperazine in a polar solvent or in a neat mixture to form levofloxacin. Further processing of the levofloxacin produced novel levofloxacin forms, including a hemihydrate and Forms A, B, C, F, G and H.
左氧氟沙星是通过将(S)-(−)-9,10-二氟-3-甲基-7-氧代-2,3-二氢-7H-吡啶[1,2,3-de][1,4]苯并噁唑-6-羧酸与N-甲基哌嗪在极性溶剂或无溶剂混合物中反应制备而成。进一步处理左氧氟沙星可产生新的左氧氟沙星形式,包括半水合物和A、B、C、F、G和H形式。