title: Synthesis and antitumor activity of tropolone derivatives. 6. Structure-activity relationships of antitumor-active tropolone and 8-hydroxyquinoline derivatives.
abstract: The bis derivative 6 of 8-hydroxyquinoline, which, like tropolones, readily forms a chelate, was synthesized and found to have high potency (dose = 12.5 mg/kg, T/C % = 164) against leukemia P388 in mice approximately equivalent to that of the bistropolone 1b. 8-Hydroxyquinoline analogues with broad structural variation were synthesized and their structure-activity relationships followed the same pattern as in the tropolone series. In addition, the bistropolones 1a-e were tested for their ability to bind to tubulin and found to have no such property. The results of this study suggested that bistropolone and bis(8-hydroxyquinoline) derivatives must form a chelate with the metal necessary for the enzyme, such as ribonucleotide reductase, which catalyzes the DNA biosynthetic pathways.
mesh_terms: D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000627:therapeutic use; D003078:Colchicine / Q000378:metabolism; D003508:Cycloheptanes; D006912:Hydroxyquinolines; D007941:Leukemia P388 / Q000188:drug therapy; D051379:Mice; D015125:Oxyquinoline; D013329:Structure-Activity Relationship; D014334:Tropolone / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000627:therapeutic use
chemical_list: D000970:Antineoplastic Agents; D003508:Cycloheptanes; D006912:Hydroxyquinolines; D015125:Oxyquinoline; D014334:Tropolone; D003078:Colchicine