Synthesis of 3′-Deoxy-3′-difluoromethyluridine and 2′-Deoxy-2′-difluoromethyluridine

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Abstract
The synthesis of 3’-deoxy-3’-difluoromethyluridine (9) and 2’-deoxy-2’-difluoromethyluridine (7β) by hydrogenation of the corresponding difluoromethylene derivatives is described. A second synthesis of the latter has been performed. Starting from thymidine, a two-step procedure affords the benzylated furanoid glycal 12. Addition of dibromodifluoromethane gives the α-2’-deoxy-2’-bromodifluoromethylarabinose (13). This compound allowed an access to α- or β -2’-deoxy-2’-difluoromethyluridine via a SN2 type reaction on a α-halodeoxyarabinose species.