7-(Pyridinyl)-/-alkyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acid having antibacterial activity and preparation thereof
申请人:STERLING DRUG INC.
公开号:EP0179239A2
公开(公告)日:1986-04-30
1-Ethyt-6-ftuoro-1,4-dihydro-7-(2,6-dimethy)-4-pyridinyt)-4-oxo-3-quinolinecarboxylic acid or salt thereof, a novel compound useful highly potent antibacterial agent with a broad spectrum of anti-microbial activity, is prepared by nitrating the corresponding 6-desfluoro compound to produce the corresponding 6-nitro compound, reducing the latter compound to produce the corresponding 6-amino compound and converting the 6-amino via its diazonium salt to said 6-fluoro compound. Said novel acid is also prepared via intermediates prepared by heating 4-(2-fluorophenyl)-2,6-dimethyl-3,5-pyridinedicarboxylic acid to produce a mixture of 4-(2-fluorophenyl)-2,6-di-methylpyridine and 2,4-dimethyl-5H-[1]benzopyrano[3,4-c)pyridin-5-one, separating the components of said mixture and nitrating 4-(2-fluorophenyl)-2,6-dimethylpyridine to produce 4-(2-fluoro-5-nitrophenyl)-2,6-dimethylpyridine.
1-乙基-6-氟-1,4-二氢-7-(2,6-二甲基)-4-吡啶)-4-氧代-3-喹啉羧酸或其盐是一种新型化合物,是一种具有广谱抗微生物活性的高效抗菌剂、其制备方法是:硝化相应的 6-去氟化合物,生成相应的 6-硝基化合物;还原后者,生成相应的 6-氨基化合物;然后通过重氮盐将 6-氨基化合物转化为所述 6-氟化合物。所述新型酸也可以通过加热 4-(2-氟苯基)-2,6-二甲基-3,5-吡啶二羧酸生成 4-(2-氟苯基)-2,6-二甲基吡啶和 2、4-(2-氟苯基)-2,6-二甲基吡啶和 2,4-二甲基-5H-[1]苯并吡喃并[3,4-c]吡啶-5-酮的混合物,分离所述混合物的组分并硝化 4-(2-氟苯基)-2,6-二甲基吡啶,生成 4-(2-氟-5-硝基苯基)-2,6-二甲基吡啶。