title: Design, synthesis and in vitro antibacterial/antifungal evaluation of novel 1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7(1-piperazinyl)quinoline-3-carboxylic acid derivatives.
abstract: A series of 1-ethyl-6-fluoro-1,4-dihydro-4-oxo-7(1-piperazinyl)quinoline-3-carboxylic acid (norfloxacin) derivatives were prepared according to the principle of combinating bioactive substructures and tested for their activities against five plant pathogenic bacteria and three fungi in vitro. The preliminary bioassays indicated that almost all synthesized target compounds retained the antibacterial activities of norfloxacin and had some antifungal activities as carboxylic acid amide compounds. The activities of compounds 1 and 22 against Xanthomonas oryzae were better than norfloxacin and all tested compounds had better antibacterial activities as compared to the agricultural streptomycin sulfate (a commercial bactericide) against X. oryzae, Xanthomonas axonopodis and Erwinia aroideae. Additionally, compounds 2 and 20 displayed good antifungal activities against Rhizoctonia solani and their inhibition of growth reached 83% and 94% respectively at the concentration of 200mg/L.
authors: West China School of Pharmacy, Sichuan University, Chengdu 610064, PR China.
authors: Zhiyi
authors: Z
authors: Yu
authors: Guanying
authors: G
authors: Shi
authors: Qiu
authors: Q
authors: Sun
authors: Hong
authors: H
authors: Jin
authors: Yun
authors: Y
authors: Teng
authors: Ke
authors: K
authors: Tao
authors: Guoping
authors: G
authors: Zhou
authors: Wei
authors: W
authors: Liu
authors: Fang
authors: F
authors: Wen
authors: Taiping
authors: T
authors: Hou
mesh_terms: D000900:Anti-Bacterial Agents / Q000737:chemistry / Q000494:pharmacology; D000890:Anti-Infective Agents / Q000737:chemistry* / Q000494:pharmacology*; D000935:Antifungal Agents / Q000737:chemistry / Q000494:pharmacology; D001419:Bacteria / Q000187:drug effects; D002264:Carboxylic Acids / Q000737:chemistry* / Q000494:pharmacology*; D005658:Fungi / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D015394:Molecular Structure; D009643:Norfloxacin / Q000494:pharmacology; D011804:Quinolines / Q000737:chemistry* / Q000494:pharmacology*; D013329:Structure-Activity Relationship
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D000935:Antifungal Agents; D002264:Carboxylic Acids; D011804:Quinolines; D009643:Norfloxacin