Studies on biologically active halogenated compounds. IV. Synthesis and antibacterial activity of fluorinated quinoline derivatives.
作者:JUNICHI TANI、YOSHITAKA MUSHIKA、TOTARO YAMAGUCHI
DOI:10.1248/cpb.30.3530
日期:——
Polyfluorinated derivatives of 1-alkyl-1, 4-dihydro-7-methyl-4-oxoquinoline-3-carboxylic acids were synthesized and examined for antibacterial activites in vitro. Among the N-substituents, the strength of antibacterial activity of the derivatives was in the order : CH2CH2F>CH2CH3>CH2CF3>CHF2. Introduction of two fluorine atoms at the 6 and 8 positions of the skeleton (21a, b) led to high activity, but substitution of the 7-methyl group (20, 21, 25) with a fluoromethyl group (40, 41, 48) led in general to reduced activity. Thus, 6, 8-difluoro-1, 4-dihydro-1-(2-fluoroethyl)-7-methyl-4-oxoquinoline-3-carboxylic acid (21b) showed the highest activity, almost equal to that of oxolinic acid.
合成了一系列1-烷基-1,4-二氢-7-甲基-4-氧代喹啉-3-羧酸的多氟化衍生物,并对其体外抗菌活性进行了检测。在这些N-取代基中,衍生物的抗菌活性强度为:CH2CH2F>CH2CH3>CH2CF3>CHF2。在骨架的6和8位引入两个氟原子(21a, b)导提高了活性,但一般将7-甲基(20, 21, 25)替换为氟甲基(40, 41, 48)后活性有所降低。因此,6,8-二氟-1,4-二氢-1-(2-氟乙基)-7-甲基-4-氧喹啉-3-羧酸(21b)表现出最高的抗菌活性,几乎与奥索利酸相当。