Kosaku Hirota, Hideki Takasu, Yoshie Tsuji and Hironao Sajiki
3′-Substituted pyrimidine nucleoside derivatives are obtained in moderate to high yields by the reactionof 1-(2′,3′-anhydro-5′-deoxy-4′,5′-didehydro-α-L-erythro-pentofuranosyl)uracil with nucleophiles without the formation of the corresponding 2′-adduct.