Abstract
The photo-adduct obtained from benzoyloxyacetaldehyde and furan was epoxidized, and the tricyclic compound was converted by reaction of persilylated thymine and cytosine in the presence of zinc chloride to thymidine and cytidine analogues containing a fused dioxabicyclo[3.2.0]heptane „sugar“ portion, which were converted to furanosides of well defined stereochemistry.