A compound of the formula (1):
1
wherein R
1
and R
2
are the same or different and represent a hydrogen atom, a hydroxyl protecting group, a phosphate group, or —P(R
3
)R
4
, wherein R
3
and R
4
are the same or different and represent a hydroxyl group, an amino group, an alkoxy group having from 1 to 4 carbon atoms, a cyanoalkoxy group having from 1 to 5 carbon atoms or an amino group substituted by an alkyl group having from 1 to 4 carbon atoms; A represents an alkylene group having from 1 to 4 carbon atoms and B represents a purin-9-yl group, a 2-oxo-pyrimidin-1-yl group, a substituted purin-9-yl group or a substituted 2-oxo-pyrimidin-1-yl group having a substituent &agr; selected from the group consisting of a hydroxyl group which may be protected, an alkoxy group having from 1 to 4 carbon atoms, a mercapto group which may be protected, an alkylthio group having from 1 to 4 carbon atoms, an alkoxy group having from 1 to 4 carbon atoms, an amino group which may be protected, a mono- or di-alkylamino group which may be substituted by an alkyl group having from 1 to 4 carbon atoms, an alkyl group having from 1 to 4 carbon atoms and a halogen atom; or a salt thereof.
化合物的式子(1):1其中R1和R2相同或不同,表示氢原子,羟基保护基,
磷酸基或-P(R3)R4,其中R3和R4相同或不同,表示羟基,
氨基,具有1至4个碳原子的烷氧基,具有1至5个碳原子的
氰基烷氧基或被1至4个碳原子的烷基取代的
氨基; A表示具有1至4个碳原子的烷基,B表示
嘌呤-9-基,2-氧代
嘧啶-1-基,取代的
嘌呤-9-基或取代的2-氧代
嘧啶-1-基,具有α取代基,所述α取代基选自羟基(可能被保护),具有1至4个碳原子的烷氧基,巯基(可能被保护),具有1至4个碳原子的烷
硫基,具有1至4个碳原子的烷氧基,
氨基(可能被保护),可以被1至4个碳原子的烷基取代的单烷基或双烷基
氨基,具有1至4个碳原子的烷基和卤原子; 或其盐。