5-(Trifluoromethyl)-beta-l-2'-deoxyuridine, the L-enantiomer of trifluorothymidine: stereospecific synthesis and antiherpetic evaluations

Synthesis and studies of 3'-C-trifluoromethyl-beta-D-ribonucleosides bearing the five naturally occurring nucleic acid bases

3'-C-Trifloromethyl-beta-D-ribonucleoside derivatives bearing the five naturally occurring nucleic acid bases have been synthesized. All these derivatives were prepared by glycosylation reactions of purine and pyrimidine bases with a suitable peracylated 3-C-trifluoromethyl ribofuranose precursor. After deprotection, the resulting title nucleoside analogues were tested for their inhibitory properties against the replication of HIV, HBV and several RNA viruses. However, none of these compounds showed significant antiviral activity.

Synthesis and antiviral evaluation of beta-D- and beta-L-pentofuranonucleoside derivatives bearing 5-trifluoromethylcytosine as the base

Beta-D- and beta-L-pentofuranonucleoside derivatives bearing 5-trifluoromethylcytosine as the base have been synthesized. The compounds were tested for their activity against HIV and HBV, but they did not show significant antiviral effect.

Research on L-nucleosides. Synthesis and biological evaluation of a series of L- and D-2',3'-dideoxy-3'-[tris(methylthio)methyl]-beta-pentofuranosyl nucleosides

Novel nucleoside analogues of both D and L enantiomeric series were prepared by coupling reaction between a 2',3'-dideoxy-3'-modified furanose moiety and four different nucleobases. Though in all cases anomeric mixtures of nucleosides were obtained, the presence of the sterically bulky 3'-tris(methylthio)methyl group allowed a good stereoselectivity level. All the compounds of both enantiomeric series showed high IC(50) values as HSV-1 TK inhibitors and scarce ability to be phosphorylated by HSV-1 TK. In order to overcome possible problems related to the first phosphorylation step and to facilitate the penetration of the molecule through the cellular membrane, a monophosphate prodrug containing a long lipophilic chain was synthesized. No appreciable antiviral activity was exhibited by this molecule.