Short synthesis and antiviral activity of acyclic phosphonic acid nucleoside analogues

Synthesis of novel 6'-spirocyclopropyl-5'-norcarbocyclic adenosine phosphonic Acid analogues as potent anti-hiv agents

Novel 5'-norcarbocyclic adenosine phosphonic acid analogues with 6'-electropositive moiety such as spirocyclopropane were designed and synthesized from the commercially available diethylmalonate 5. Regioselective Mitsunobu reaction proceeded in the presence of an allylic functional group at a low reaction temperature in polar cosolvent [dimethylformamide (DMF)/1,4-dioxane] to give purine analogue 15. To improve cellular permeability and enhance the anti-human immunodeficiency virus (HIV) activity of this phosphonic acid, a SATE phosphonodiester nucleoside prodrug 23 was prepared. The synthesized adenosine phosphonic acids analogues 18-21 and 23 were subjected to antiviral screening against HIV-1.

Design and synthesis of carbocyclic versions of furanoid nucleoside phosphonic Acid analogues as potential anti-hiv agents

Novel 5'-norcarbocyclic adenine and guanine phosphonic acid analogues with 6',6'-difluorine moiety were designed and synthesized from commercially available epichlorohydrin 5. A regioselective Mitsunobu reaction successfully proceeded from an allylic functional group 16b at low reaction temperature in polar cosolvent to give purine phosphonate analogues 17 and 24, respectively. The purine nucleoside phosphonate and phosphonic acid analogues were subjected to antiviral screening against HIV-1. Adenine analogue 21 and its SATE prodrug 29 show significant anti-HIV activity in MT-4 cell lines.

Synthesis of novel 4'-cyclopropyl-5'-norcarbocyclic adenosine phosphonic acid analogues

Novel 4'-cyclopropyl-5'-norcarbocyclic adenosine phosphonic acid analogues were designed and racemically synthesized from propionaldehyde 5 through a de novo acyclic stereoselective route using triple Grignard addition and ring-closing metathesis (RCM) as key reactions. To improve cellular permeability and enhance the anti-HIV activity of this phosphonic acid, SATE phosphonodiester nucleoside prodrug 23 was prepared. The synthesized adenosine phosphonic acids analogues 17, 18, 19, 21, and 23 were subjected to antiviral screening against HIV-1. Compound 23 exhibits enhanced anti-HIV activity than its parent nucleoside phosphonic acid 18.

Design and synthesis of dually branched 5'-norcarbocyclic adenosine phosphonodiester analogue as a new anti-HIV prodrug

A novel 3',4'-dimethyl-5'-norcarbocyclic adenosine phosphonic acid was prepared using acyclic stereoselective route from 4-hydroxybutan-2-one (4). To improve the cellular permeability and enhance the anti-HIV activity of this phosphonic acid, a (bis)SATE phosphonodiester nucleoside prodrug (20) was prepared and its chemical stability was evaluated. The newly synthesized bis(SATE) analogue (20) and its parent nucleoside phosphonic acid (18) were assayed for anti-HIV activity using an in vitro assay system in a CEM cell line.

Synthesis and anti-HIV evaluation of new acyclic phosphonate nucleotide analogues and their bis(SATE) derivatives

This article describes a very simple route for synthesizing novel lipophilic phosphonate bis(t-bu-SATE) prodrugs of acyclic cyclopentenylated nucleosides such as adenine 17 and cytosine 18. The key intermediate 6 was constructed via a ring-closing metathesis of compound 5, which could be readily prepared from diethylmalonate 4. The chemical stability of the bis(SATE) derivatives was tested at neutral (pH = 7.2) and slightly acid (milli-Q water, pH = 5.5) pH. The synthesized compounds were evaluated as potential antiviral agents against HIV-1 virus.

Design and synthesis of novel SATE derivatives of acyclic isocytosine and 9-deazaadenine C-nucleosides

This article describes a very simple route for synthesizing novel lipophilic phosphate bis(t-bu-SATE) prodrugs of acyclic cyclobutylated C-nucleosides such as isocytosine 12 and 9-deazaadenine 19, which were prepared from 1,1-gem cyclobutyl dicarboxylate. Synthesized compounds were evaluated as potential antiviral agents against HIV virus. Some phosphate SATE prodrugs were more active against HIV than parent nucleosides.