title: Synthesis of some novel quinoline-3-carboxylic acids and pyrimidoquinoline derivatives as potential antimicrobial agents.
abstract: The synthesis and in vitro antimicrobial evaluation of several quinoline and pyrimidoquinoline derivatives are described. Treatment of 7-substituted quinolin-2(1H)-one-3-carboxylic acids 2a-c with phosphoryl chloride or thionyl chloride gave rise to the 7-substituted 2-chloroquinoline-3-carboxylic acids 3a-c and 7-substituted 2-chloro-3-chlorocarbonylquinolines 5a-c respectively. The 2-chloro function in compounds 3a-c was replaced by 2-aminothiazole or 2-aminopyridine to give 2-(thiazol-2-yl)aminoquinoline-3-carboxylic acids 4a-c or 2-(pyrid-2-yl)aminoquinoline-3-carboxylic acids 4d-f. Treatment of 5a-c with the same heterocyclic amines at room temperature furnished the corresponding 7-substituted 2-chloro-3-heteryl-aminocarbonylquinolines 6a-f. The tetracyclic 9-substituted thiazolo[3', 2':1, 2]-pyrimido[4, 5-b]quinolin-5-ones 7a-c and 10-substituted pyrido[1', 2':1, 2]-pyrimido[4, 5-b]quinolin-6-ones 7d-f were synthesized by heating 5a-c with the heterocyclic amines in toluene or by heating 6a-f under reflux in dimethylformamide. The products were evaluated in vitro for potential antimicrobial activity.
authors.affiliation: Pharmaceutical Chemistry Department, Faculty of Pharmacy, University of Alexandria, Alexandria 21215, Egypt. oolaomar@hotmail.com
authors.forename: Ola A
authors.initials: OA
authors.lastname: El-Sayed
authors.forename: Badr A
authors.initials: BA
authors.lastname: Al-Bassam
authors.forename: Maher E
authors.initials: ME
authors.lastname: Hussein
mesh_terms: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D002264:Carboxylic Acids / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D005658:Fungi / Q000187:drug effects; D006090:Gram-Negative Bacteria / Q000187:drug effects; D006094:Gram-Positive Bacteria / Q000187:drug effects; D009682:Magnetic Resonance Spectroscopy; D008826:Microbial Sensitivity Tests; D011804:Quinolines / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology
chemical_list: D000900:Anti-Bacterial Agents; D000890:Anti-Infective Agents; D002264:Carboxylic Acids; D011804:Quinolines