Novel acyclonucleotides: synthesis and antiviral activity of alkenylphosphonic acid derivatives of purines and a pyrimidine.
A series of phosphonoalkenyl and (phosphonoalkenyl)oxy derivatives of purines and a pyrimidine were synthesized. These compounds are the first reported acyclonucleotides which incorporate the alpha,beta-unsaturated phosphonic acid moiety as the phosphate mimic and include compounds in which the acyclic substituent is attached to N-9 of a purine or N-1 of a pyrimidine by either a nitrogen-carbon or a nitrogen-oxygen bond. The phosphonoalkenyl-substituted compounds 7a-c, 8a-c, 9, 10, and 12 were prepared either by Mitsunobu coupling of alcohols with purine or pyrimidine derivatives or by alternative alkylations of the heterocyclic bases. The (phosphonoalkenyl) oxy derivatives 7d-g, 8d-g, and 11 were synthesized by coupling of alcohols with 9-hydroxypurines or a 1-hydroxypyrimidine under Mitsunobu conditions. The novel acyclonucleotides were tested for activity against herpes simplex types 1 and 2 (HSV-1 and HSV-2), varicella zoster virus (VZV), cytomegalovirus (CMV), visna virus, and human immunodeficiency virus type 1 (HIV-1). Guanine derivatives were moderately to extremely cytotoxic, but the adenines were less toxic to cells. At the concentrations tested, (Z)-isomers in the unbranched series had no activity against herpes viruses or HIV-1. (E)-9-[(4-Phosphonobut-3-enyl) oxy]adenine (7d) displayed selective activity against HIV-1, (E)-2,6-diamino-9-(4-phosphonobut-3-enyl) purine (9) showed selective antiretrovirus activity, and (E)-9-[2-(hydroxymethyl)-4-phosphonobut-3-enyl]adenine (7c) showed selective antiherpesvirus (VZV and CMV) activity.
SmithKline Beecham Pharmaceuticals, Epsom, Surrey, U.K.
M R
MR
Harnden
A
A
Parkin
M J
MJ
Parratt
R M
RM
Perkins
D000998:Antiviral Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D002478:Cells, Cultured; D006564:Herpesviridae / Q000187:drug effects; D008826:Microbial Sensitivity Tests; D063065:Organophosphonates / Q000138:chemical synthesis* / Q000494:pharmacology; D011685:Purine Nucleotides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D011742:Pyrimidine Nucleotides / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology; D012190:Retroviridae / Q000187:drug effects
D000998:Antiviral Agents; D063065:Organophosphonates; D011685:Purine Nucleotides; D011742:Pyrimidine Nucleotides