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A set of pyrimidine nucleosides fused with a 4′‐C,3′‐O‐propylene bridge was successfully synthesised in 12 steps from 1,2:5,6‐di‐O‐isopropylidene‐α‐D‐glucofuranose, an inexpensive starting material, based on a ring‐closing metathesis (RCM) reaction followed by Vorbrüggen‐type nucleobase coupling. Antiviral and cytotoxicity activities of the targeted modified nucleosides, as well as their phosphoramidate prodrugs, are described.

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