Abstract
In order to obtain rigidity within the sugar moiety of nucleosides, some bicyclic pyrimidine nucleoside analogues were synthesized starting from cyclopentanone. The C-3′ is fused to C-4′ via a propylene linker in order to obtain a [3.3.0]-bicyclic ring system wherein the sugar moiety should be restricted to mainly the C-1′-exo conformation.
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