The present invention provides a hemiacetal ester prodrug of the pyridone carboxylic acid antibacterial drug, wherein the prodrug is characterized in that, (i) it is hydrolyzed promptly after intestinal absorption and regenerates the pyridone carboxylic acid antibacterial drug as a drug substance, (ii) a one-dose package is possible by preventing chelate-formation in intestines in an oral administration, and (iii) the normal bacterial flora of the intestinal bacterial flora is not influenced at all until the ester is absorbed, because the hemiacetal-type esterification is executed on the carboxylic acid which is a center of the antibacterial action, resulting in prevention of the pseudomembranous colitis. The prodrug is an alkoxy carbonyl hemiacetal-type ester represented by the chemical formula (I), which is useful as a prodrug for inhibiting the enteric-bacterium-shift side effect, and can be used in combination with polyvalent metal-containing medicines.
本发明提供了
吡啶酮羧酸抗菌药的
半缩醛酯前药,其中该前药的特征在于,(i)在肠道吸收后迅速
水解并再生为
吡啶酮羧酸抗菌药作为药物物质,(ii)通过在口服时防止在肠道中形成螯合物,可以实现单剂量包装,(iii)在酯被吸收之前,肠道细菌群落的正常菌群完全不受影响,因为
半缩醛型酯化作用发生在抗菌作用中心的
羧酸上,从而预防假膜性结肠炎。该前药是一种由
化学式(I)表示的烷氧羰基
半缩醛型酯,可用作抑制肠道细菌移位副作用的前药,并可与含多价
金属的药物结合使用。