title: Synthesis, in vitro antiviral evaluation, and stability studies of bis(S-acyl-2-thioethyl) ester derivatives of 9-[2-(phosphonomethoxy)ethyl]adenine (PMEA) as potential PMEA prodrugs with improved oral bioavailability.
abstract: A new series of hitherto unknown 9-[2-(phosphonomethoxy)ethyl]adenine (PMEA) phosphonodiester derivatives incorporating carboxyesterase-labile S-acyl-2-thioethyl (SATE) moieties as transient phosphonate-protecting groups was prepared in an attempt to increase the oral bioavailability of the antiviral agent PMEA. We report here a direct comparison of the in vitro anti-HIV and anti-HSV activities as well as the in vitro stability between the bis(SATE) derivatives and the already known PMEA prodrugs, namely, bis[(pivaloyloxy)methyl (POM)]- and bis[dithiodiethyl (DTE)]PMEA. All of the compounds tested showed an enhanced in vitro antiviral activity compared to the parent PMEA. The bis(POM)- and bis(tBu-SATE)PMEA derivatives were the most effective. However, striking differences between these two compounds were found during the stability studies. In particular the bis(tBu-SATE)PMEA was found to be more stable than bis(POM)PMEA in human gastric juice and human serum, suggesting it could be considered as a promising candidate for further in vivo development.
authors.affiliation: Laboratoire de Chimie Bioorganique, UMR CNRS-USTL, Université Montpellier II, France.
authors.forename: S
authors.initials: S
authors.lastname: Benzaria
authors.forename: H
authors.initials: H
authors.lastname: Pélicano
authors.forename: R
authors.initials: R
authors.lastname: Johnson
authors.forename: G
authors.initials: G
authors.lastname: Maury
authors.forename: J L
authors.initials: JL
authors.lastname: Imbach
authors.forename: A M
authors.initials: AM
authors.lastname: Aubertin
authors.forename: G
authors.initials: G
authors.lastname: Obert
authors.forename: G
authors.initials: G
authors.lastname: Gosselin
mesh_terms: D000225:Adenine / Q000031:analogs & derivatives* / Q000138:chemical synthesis / Q000737:chemistry / Q000494:pharmacology; D000284:Administration, Oral; D000998:Antiviral Agents / Q000008:administration & dosage / Q000737:chemistry / Q000493:pharmacokinetics*; D001682:Biological Availability; D002460:Cell Line; D004355:Drug Stability; D018259:Herpesvirus 1, Human / Q000187:drug effects; D006801:Humans; D009682:Magnetic Resonance Spectroscopy; D063065:Organophosphonates; D011355:Prodrugs / Q000008:administration & dosage / Q000737:chemistry / Q000493:pharmacokinetics*; D016339:Spectrometry, Mass, Fast Atom Bombardment
chemical_list: D000998:Antiviral Agents; D063065:Organophosphonates; D011355:Prodrugs; C053001:adefovir; D000225:Adenine