afford 1-(3'-deoxy-4',6'-O-isopropylidene-3'-methylene-beta-d-glucopyranosyl)pyrimidines 7a-c. Oxidation of the free hydroxyl group in the 2'-position of the sugar moiety led to the formation of the labile 1-(3'-deoxy-4',6'-O-isopropylidene-3'-methylene-beta-d-glucopyranosyl-2'-ulose)py rimidines 8a-c. Finally, deisopropylidenation of the resulted derivatives 8a-c afforded the diol nucleosides 9a-c. The