PURPOSE:To produce the subject compound having a high AIDS virus-resistant activity and useful as an anti-AIDS drug or a synthetic intermediate therefor by condensing a specific furanose derivative with a 5-saturated pyrimidine derivative. and subsequently subjecting the produced compound to a reductive desulfurization reaction and further to a protecting group-removing reaction. CONSTITUTION:A compound of formula II [R is (substituted) alkyl, (substituted) phenyl; Z is halogeno, alkoxy, etc.,] is derived from a compound of formula I (R is an OH-protecting group). The compound of formula II is condensed with a 5-substituted pyrimidine derivative of formula III [R -R are alkyl, phenyl; X is O, N; Y is H, halogen, (halogenated) alkyl, (halogenated) alkenyl]. The obtained compound of formula IV is subjected to a reductive desulfurization reaction to produce a compound of formula V, which is subjected to a protecting group-removing reaction to provide the objective compound of formula VI.