title: 2'-Fluorinated arabinonucleosides of 5-(2-haloalkyl)uracil: synthesis and antiviral activity.
abstract: The synthesis of 5-(2-fluoroethyl)-2'-deoxyuridine (FEDU, 4b), its 2'-fluoro analogue 1-(2-deoxy-2-fluoro-beta-D-arabinofuranosyl)-5-(2-fluoroethyl)-1H,3H- pyrimidine-2,4-dione (FEFAU, 4k), and the 2'-fluoro analogue of the potent antiherpes virus compound 5-(2-chloroethyl)-2'-deoxyuridine (CEDU), 5-(2-chloroethyl)-1-(2-deoxy-2-fluoro-beta-D-arabinofuranosyl)-1H,3H-pyr imidine - 2,4-dione (CEFAU, 4i), is described. The antiviral activities of these compounds were determined in cell culture against herpes simplex virus (HSV) types 1 and 2 and varicella zoster virus (VZV). All compounds were shown to possess significant and selective antiviral activity. FEDU proved less potent than CEDU against VZV replication; however, it was more active against HSV-2. CEFAU showed marked activity against HSV-1, HSV-2, and VZV. The compound containing fluorine at both positions, FEFAU, exhibited the strongest antiviral potency against HSV-1, HSV-2, and VZV. It inhibited HSV-1 at a concentration of 0.03-0.2 microgram/mL, HSV-2 at 0.1-0.3 microgram/mL, and VZV at 0.03 microgram/mL. Neither FEDU nor CEFAU or FEFAU exerted a significant inhibitory effect on cell proliferation at a concentration of 100 micrograms/mL. Thus, the cytotoxicity of these compounds is as low as that of CEDU and compares favorably to that of previously described 2'-fluoroarabinosyl nucleoside analogues.
mesh_terms: D000998:Antiviral Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D001973:Bromodeoxyuridine / Q000031:analogs & derivatives / Q000494:pharmacology; D003857:Deoxyuridine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology; D005467:Floxuridine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology; D018139:Simplexvirus / Q000187:drug effects; D013329:Structure-Activity Relationship
chemical_list: D000998:Antiviral Agents; D005467:Floxuridine; C053111:5-(2-fluoroethyl)-2'-deoxyuridine; C020235:brivudine; C047370:5-(2-chloroethyl)-2'-deoxyuridine; D001973:Bromodeoxyuridine; D003857:Deoxyuridine