Abstract
5-Formyl-2′,3′-O-isopropylideneuridine and 5-formyl-2′,3′,5′-tri-O-acetyluridine were prepared by a new procedure involving palladium-catalyzed coupling of 5-iodouridine with styrene, followed by reaction with acetic anhydride or acetone and ozonolysis of the resulting 5-styryluridine derivatives.