Synthesis of 3'-O2-(azaheterocycle)-thymidines

The synthesis of 3'-O2-(azaheterocycle)-thymidines is presented from 1-thia-3-aza- 1,3-butadiene precursors (N-thioacylamidines). A variety of heterocycles is accessible using the dienic, the electrophilic or the nucleophilic reactivity of these thia-azabutadiene systems. 3'-O2-(azaheterocycle)-thymidine analogues are regarded as potential substrates to interfere with the DNA-polymerization process.

Novel L-lyxo and 5'-deoxy-5'-modified TSAO-T analogs: synthesis and anti-HIV-1 activity

Novel L-lyxo-TSAO-T analogs with an inverted configuration at the C-4'-position of the sugar moiety and 5'-deoxy-5'-modified TSAO-T derivatives have been prepared and evaluated for their inhibitory effect on human immunodeficiency virus type 1 (HIV-1) and type 2 (HIV-2) replication in cell culture. None of the compounds showed marked antiviral efficacy. The inactivity of the TSAO-T derivatives may most likely be explained by either their different 4'-configuration or their different chemical structure that may not allow an optimal interaction of the molecules with the lipophilic binding pocket of the HIV-1 reverse transcriptase.