4-hydroxy-3-quinolinecarboxylates (3), which led to mixtures of the corresponding quinolinecarboxylic acids (4 and 5) by hydrolysis. The proportions of 4 and 5 in the mixtures were determined on the basis of their nmr spectra. Novel 5-chloro- (8a), 5-methyl- (8b) and 5-nitro-1-ethyl-1,4-dihydro-4-oxo-3-quinolinecarboxylic acids were prepared and evaluated for antimicrobial activities. No significant activity, however
的环化米取代anilinomethylenemalonates(1)在多
磷酸酯和其他一些环化剂的存在下,得到异构体5-(混合物2)和7-取代的
4-羟基-
3-喹啉羧酸(3),这导致了
水解相应的
喹啉羧酸的混合物(4和5)。根据混合物的核磁共振光谱确定混合物中4和5的比例。新型5-
氯-(8a),5-甲基-(8b)和5-硝基-1-乙基-1,4-二氢-4-氧代-
3-喹啉羧酸并评估其抗菌活性。但是,没有发现明显的活动。