We report on the synthesis of novel conformationally locked nucleoside and nucleotide derivatives, which are structurally closely related to clinically used antivirals such as didanosine and abacavir. As a suitable conformationally rigid substitute of the sugar/pseudosugar ring allowing a permanent stabilization of the nucleoside in North conformation we employed bicyclo[2.2.1]heptane (norbornane) substituted in the bridgehead position with a hydroxymethyl group and in the C-3 position with a nucleobase. Prepared nucleoside derivatives were also converted into appropriate phosphoramidate prodrugs (ProTides) in order to increase delivery of the compounds in the cells. All target compounds were evaluated in a broad antiviral and cytostatic assay panel.

Gilead Sciences and IOCB Research Centre Institute of Organic Chemistry and Biochemistry Academy of Sciences of the Czech Republic v v i 166 10 Prague 6 Czech Republic

Rega Institute for Medical Research KU Leuven Minderbroedersstraat 10 BE 3000 Leuven Belgium

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