Synthesis and antibacterial activity of 1-(substituted-benzyl)-6-fluoro-1,4-dihydro-4-oxoquinoline-3-carboxylic acids and their 6,8-difluoro analogs
作者:Jia-Yuh Sheu、Yeh-Long Chen、Kuo-Chang Fang、Tai-Chi Wang、Cherng-Chyi Tzeng、Chien-Fang Peng
DOI:10.1002/jhet.5570350429
日期:1998.7
then acidified with hydrochloric acid afforded the desired 1-(substituted-benzyl)-6-fluoro-1,4-dihydro-4-oxo-7-(1-iperazinyl)quinoline-3-carboxylic acids. The 6,8-difluoro analogs were prepared similarly using 6,7,8-trifluoro-4-hydroxyquinoline-3-carboxylic acid ethyl ester as a starting material. Some of these quinolones demonstrated fairly good antibacterial activities. Among them, 6-fluoro-1-(4-fluorophenylmethyl)-1
将6,7-二氟-4-羟基喹啉-3-羧酸乙酯与取代的苄基氯烷基化,得到1-(取代的苄基)-6,7-二氟-1,4-二氢-4-氧代喹啉-3-羧酸乙酯。用哌嗪或N治疗吡啶中的-甲基哌嗪产生1-(取代的苄基)-6-氟-1,4-二氢-4-氧代-7-(1-哌嗪基)喹啉-3-羧酸乙酯,将其用氢氧化钠水溶液水解,然后用盐酸酸化,得到所需的1-(取代的苄基)-6-氟-1,4-二氢-4-氧代-7-(1-哌嗪基)喹啉-3-羧酸。类似地,使用6,7,8-三氟-4-羟基喹啉-3-羧酸乙酯作为起始原料制备6,8-二氟类似物。这些喹诺酮类药物中的一些表现出相当好的抗菌活性。其中6-氟-1-(4-氟苯基甲基)-1,4-二氢-7-(1-哌嗪基)-4-氧喹啉-3-羧酸(7d)和6,8-二氟-1-( 3-氟苯基甲基)-1,4-二氢-7-(1-哌嗪基)-4-氧喹啉-3-羧酸(8c)是最好的两个。