Pyridonecarboxylic Acids as Antibacterial Agents. VI. Synthesis and Structure-Activity Relationship of 7-(Alkyl, Cycloalkyl, and Vinyl)-1-cyclopropyl-6-fluoro-4-quinolone-3-carboxylic Acids.
作者:Yozo TODO、Hiroyasu TAKAG、Fumihiko IINO、Yoshikazu FUKUOKA、Yasushi IKEDA、Keiichi TANAKA、Isamu SAIKAWA、Hirokazu NARITA
DOI:10.1248/cpb.42.2049
日期:——
The title compounds (1a-i) have been synthesized starting with ethyl 1-cyclopropyl-6, 7-difluoro-4-quinolone-3-carboxylate (2). The 7-cyclopropyl and 7-vinyl derivatives (1e and 1i) exhibited potent in vitro antibacterial activities against both gram-positive and gram-negative bacteria, being equipotent with ciprofloxacin (CPFX) except for the activity against Pseudomonas aeruginosa. The two compounds were significantly less toxic than CPFX in terms of convulsion-induction as determined by intracerebral administration to mice, but showed lower urinary recoveries on intravenous administration.
标题化合物(1a-i)已通过以乙基1-环丙基-6,7-二氟-4-喹诺酮-3-羧酸酯(2)为起始原料合成得到。其中,7-环丙基和7-乙烯基衍生物(1e和1i)在体外展现出对革兰氏阳性菌和革兰氏阴性菌的强效抗菌活性,与环丙沙星(CPFX)的活性相当,仅在对铜绿假单胞菌的活性上稍逊。在小鼠脑内注射实验中,这两种化合物在诱发惊厥方面的毒性显著低于CPFX,但在静脉注射后表现出较低的尿液回收率。