title: Benzimidazole ribonucleosides: design, synthesis, and antiviral activity of certain 2-(alkylthio)- and 2-(benzylthio)-5,6-dichloro-1-(beta-D-ribofuranosyl)benzimidazoles.
abstract: Several 2-alkylthio- and 2-benzylthio derivatives of 5,6-dichloro-1-(beta-D-ribofuranosyl)benzimidazole (DRB) have been designed and synthesized from 5,6-dichloro-1-(beta-D-ribofuranosyl)-benzimidazole-2-thione. All compounds were evaluated for activity against human cytomegalovirus (HCMV) and/or herpes simplex virus type-1 (HSV-1). Three different cytotoxicity assays were used to determine if the compounds were toxic to uninfected cells. Most of the 2-alkylthio compounds were either inactive against HCMV and HSV-1 or were active only at concentrations at or near those which produced toxicity in uninfected cells. The best separation between activity against HCMV and cytotoxicity was observed with the 2-benzylthio analog 7. This prompted us to synthesize the substituted 2-benzylthio analogs 11-23 using a Topliss Tree approach. None of these compounds were more active than compound 7; most of the analogs were weakly active against both HCMV and HSV-1, but the activity was not separated from cytotoxicity. On the basis of both antiviral and cytotoxicity data, compound 7 was the best compound in the series. It was more active against HCMV than DRB (the 2-unsubstituted analog), acyclovir, and foscarnet, but it was less active than ganciclovir.
authors.affiliation: Department of Medicinal Chemistry, College of Pharmacy, University of Michigan, Ann Arbor 48109-1065.
authors.forename: R V
authors.initials: RV
authors.lastname: Devivar
authors.forename: E
authors.initials: E
authors.lastname: Kawashima
authors.forename: G R
authors.initials: GR
authors.lastname: Revankar
authors.forename: J M
authors.initials: JM
authors.lastname: Breitenbach
authors.forename: E D
authors.initials: ED
authors.lastname: Kreske
authors.forename: J C
authors.initials: JC
authors.lastname: Drach
authors.forename: L B
authors.initials: LB
authors.lastname: Townsend
mesh_terms: D000998:Antiviral Agents / Q000138:chemical synthesis* / Q000494:pharmacology; D002460:Cell Line; D002470:Cell Survival / Q000187:drug effects; D003587:Cytomegalovirus / Q000187:drug effects*; D004004:Dichlororibofuranosylbenzimidazole / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology; D015195:Drug Design; D005347:Fibroblasts / Q000187:drug effects; D018259:Herpesvirus 1, Human / Q000187:drug effects; D006801:Humans; D007624:KB Cells; D013329:Structure-Activity Relationship
chemical_list: D000998:Antiviral Agents; D004004:Dichlororibofuranosylbenzimidazole