title: Synthesis and antitumor activity of some indeno[1,2-b]quinoline-based bis carboxamides.
abstract: A series of bis(11-oxo-11H-indeno[1,2-b]quinoline-6-carboxamides) linked through the 6-carboxamides were prepared by coupling the requisite acid imidazolides with various diamines. Compounds with mono-cationic linker chains were more potent cytotoxins than the corresponding monomer in a panel of rodent and human cell lines, while those with the dicationic linker chains (CH2)2NR(CH2)2NR(CH2)2 and (CH2)2NR(CH2)3NR(CH2)2 showed extraordinarily high potencies (for example, IC50s of 0.18-1.4 nM against human Jurkat leukemia; up to 1000-fold more potent than the parent monomer). As seen previously in the monomeric series, small, lipophilic 4-substituents significantly increased potency in cell culture. The dimeric compounds were all slightly to significantly more potent in the mutant JL(A) and JL(D) cell lines that under-express topo II, suggesting that this enzyme is not their primary target. An 11-imino-linked dimer was much less active, and an asymmetric indeno[1,2-b]quinoline-6-carboxamide/naphthalimide dimer was less active than the comparable symmetric bis(indeno[1,2-b]quinoline-6-carboxamide). Selected analogues were active against sub-cutaneously implanted colon 38 tumors in mice, giving growth delays comparable to that of the clinical topo I inhibitor irinotecan at up to 10-fold lower doses. These compounds form an interesting new class of putative topo I inhibitors.
authors.affiliation: Department of Chemistry, La Trobe University, Bundoora, Victoria, Australia. l.deady@latrobe.edu.au
authors.forename: L W
authors.initials: LW
authors.lastname: Deady
authors.forename: J
authors.initials: J
authors.lastname: Desneves
authors.forename: A J
authors.initials: AJ
authors.lastname: Kaye
authors.forename: G J
authors.initials: GJ
authors.lastname: Finlay
authors.forename: B C
authors.initials: BC
authors.lastname: Baguley
authors.forename: W A
authors.initials: WA
authors.lastname: Denny
mesh_terms: D000577:Amides / Q000138:chemical synthesis* / Q000494:pharmacology*; D000818:Animals; D000970:Antineoplastic Agents / Q000138:chemical synthesis* / Q000494:pharmacology*; D004354:Drug Screening Assays, Antitumor; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D013058:Mass Spectrometry; D051379:Mice; D011804:Quinolines / Q000737:chemistry*; D014407:Tumor Cells, Cultured
chemical_list: D000577:Amides; D000970:Antineoplastic Agents; D011804:Quinolines