title: Synthesis and biological activity of novel 5-fluoro-2'-deoxyuridine phosphoramidate prodrugs.
abstract: A series of novel haloethyl and piperidyl phosphoramidate FdUMP prodrug analogues has been synthesized, and the growth inhibitory activity of these compounds has been evaluated against L1210 mouse leukemia cells. All compounds exhibited potent inhibition of L1210 cell proliferation with IC(50) values in the nanomolar range. Growth inhibition was reversed by the addition of 5 microM thymidine, suggesting a mechanism of action involving the intracellular release of FdUMP. (31)P NMR studies carried out on model haloethyl phosphoramidates confirm the release of nucleotide via cyclization of the phosphoramidate anion to the aziridinium ion intermediate followed by hydrolysis of the P-N bond. The data suggests that <50% of the prodrug is converted to FdUMP intracellularly by this pathway. Piperidyl phosphoramidate analogues are also converted to nucleotide intracellularly, presumably by the action of an endogenous phosphoramidase.
authors.affiliation: Department of Chemistry, University of Rochester, New York 14642, USA.
authors.forename: C L
authors.initials: CL
authors.lastname: Freel Meyers
authors.forename: L
authors.initials: L
authors.lastname: Hong
authors.forename: C
authors.initials: C
authors.lastname: Joswig
authors.forename: R F
authors.initials: RF
authors.lastname: Borch
mesh_terms: D000577:Amides / Q000737:chemistry*; D000818:Animals; D000964:Antimetabolites, Antineoplastic / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D002455:Cell Division / Q000187:drug effects; D004354:Drug Screening Assays, Antitumor; D005467:Floxuridine / Q000031:analogs & derivatives* / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D005663:Furans / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D020128:Inhibitory Concentration 50; D007939:Leukemia L1210; D009682:Magnetic Resonance Spectroscopy; D051379:Mice; D010756:Phosphoric Acids / Q000737:chemistry*; D011355:Prodrugs / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D014230:Triazoles / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D014407:Tumor Cells, Cultured
chemical_list: D000577:Amides; D000964:Antimetabolites, Antineoplastic; D005663:Furans; D010756:Phosphoric Acids; D011355:Prodrugs; D014230:Triazoles; D005467:Floxuridine; C011067:phosphoramidic acid