Patent ID: 7419965

Claim:
A nucleotide derivative of formula 1 wherein R 1 is a straight-chain or branched, saturated or unsaturated alkyl chain having 1-20 carbon atoms, which is unsubstituted or substituted at least once by halogen, C 1 -C 6 alkoxy, C 1 -C 6 alkylmercapto, C 1 -C 6 alkoxycarbonyl, C 1 -C 6 alkylsulfinyl or C 1 -C 6 alkylsulfonyl groups; R 2 is hydrogen, a straight-chain or branched, saturated or unsaturated alkyl chain having 1-20 carbon atoms, which is unsubstituted or substituted at least once by halogen, C 1 -C 6 alkoxy, C 1 -C 6 alkylmercapto, C 1 -C 6 alkoxycarbonyl or C 1 -C 6 alkylsulfonyl groups; R 3 is amino or OR 4 , wherein R 4 is C 1 -C 8 alkyl; X is selected from the group consisting of a sulfur atom, a sulfinyl group and a sulfonyl group; Y is oxygen; whereby when R 3 is amino, said amino group may be unsubstituted or substituted by a known amino protecting group, their tautomers, their optically active forms and racemic mixtures, and their physiologically acceptable salts of inorganic and organic acids or bases.