title: Modifications on the heterocyclic base of acyclovir: syntheses and antiviral properties.
abstract: A group of compounds was prepared in which variations of the ring portion of the acyclovir (ACV) structure were made. These modifications included monocyclic (isocytosine, triazole, imidazole), bicyclic (8-azapurine, pyrrolo[2,3-d]pyrimidine, pyrazolo[3,4-d]pyrimidine) and tricyclic (linear benzoguanine) congeners. The derivatives were evaluated against herpes simplex virus type 1 (HSV-1) by the plaque-inhibition and plaque-reduction methods with only the 8-azapurine analogue 28 showing some activity. In a test measuring the ability of these compounds to inhibit the HSV-1 thymidine kinase, 28 and the tricyclic derivative 38 exhibited competition with ACV for binding to the enzyme. The inability of the group to exert significant antiherpetic action is attributed to their lack of phosphorylation to the requisite triphosphate stage.
authors.forename: L M
authors.initials: LM
authors.lastname: Beauchamp
authors.forename: B L
authors.initials: BL
authors.lastname: Dolmatch
authors.forename: H J
authors.initials: HJ
authors.lastname: Schaeffer
authors.forename: P
authors.initials: P
authors.lastname: Collins
authors.forename: D J
authors.initials: DJ
authors.lastname: Bauer
authors.forename: P M
authors.initials: PM
authors.lastname: Keller
authors.forename: J A
authors.initials: JA
authors.lastname: Fyfe
mesh_terms: D000212:Acyclovir / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000494:pharmacology; D000998:Antiviral Agents / Q000138:chemical synthesis*; D055598:Chemical Phenomena; D002621:Chemistry; D018139:Simplexvirus / Q000187:drug effects / Q000201:enzymology; D013937:Thymidine Kinase / Q000037:antagonists & inhibitors
chemical_list: D000998:Antiviral Agents; D013937:Thymidine Kinase; D000212:Acyclovir