Compounds represented by the general formula (I),
wherein R¹ is a saturated or unsaturated, straight or branched hydrocarbon radical [wherein the number of carbon atoms in the longest straight chain of this hydrocarbon radical ranges from three to seven], or a radical of the formula -(CH₂)n-Y [in which n is an integer from 0 to 4, when Y is a cyclohexyl radical, or n is an integer from 2 to 4, when Y is a lower alkoxy radical having 1 to 4 carbon atom(s) or a phenyl radical], and R² is a hydrogen atom or a radical easily hydrolyzable under physiological conditions,
as well as hydrates or solvates of the compounds of the general formula (I), can be utilized in the treatment of tumors, They can be prepared by reacting a compound of formula R¹-OCOCl with a N⁴-unsubstituted 5'-deoxy-5-fluorocytidine of the above formula I, wherein R² would stand for protecting groups, and if necessary removing the protecting groups.
通式 (I) 所代表的化合物、
其中 R¹ 是饱和或不饱和、直链或支链烃基[其中该烃基最长直链上的碳原子数为 3 至 7],或式 -(CH₂)n-Y 的基[其中 n 为 0 至 4 的整数、当 Y 为环己基时,或当 Y 为具有 1 至 4 个碳原子的低级烷氧基或苯基时,n 为 2 至 4 的整数],且 R² 为氢原子或在生理条件下易于
水解的基、
它们可以通过将式 R¹-OCOCl 的化合物与上式 I 的 N⁴-未取代的 5'-脱氧-5-
氟胞苷反应制备,其中 R² 代表保护基团,必要时去除保护基团。