Synthetic Studies Related to Antibiotics Containing Higher-carbon Sugars

The anion of $6-benzenesulfonyl-3-O-benzyl-6-deoxy-1,2-O-isopropylidene-{\alpha}-d-glucofuranose$ was stable and reacted with carbon electrophiles to give higher-carbon sugars. Reactions of uridine 5'-aldehyde with phosphoranes afforded heptofuranose nucleosides.