Novel 2'-alkylidenepyrimidine nucleoside derivatives represented by formula (I)
or salts thereof are disclosed, wherein R1 represents an amino group or a hydroxy group, R2 represents a hydrogen atom, a halogen atom or a lower alkyl group, R3 represents a hydrogen atom or a lower alkyl group, and R4 represents a hydrogen atom or a phosphoric acid residue. These novel compounds may be prepared by using a uridine or cytidine derivative as the starting material and introducing an alkylidene group into the 2'-position of the sugar moiety with a Wittig reagent. These compounds have an excellent antiviral effect, thus providing novel antiviral drugs.
由式(I)表示的新型 2'-烷基亚
嘧啶核苷衍
生物
或其盐,其中 R1 代表
氨基或羟基,R2 代表氢原子、卤素原子或低级烷基,R3 代表氢原子或低级烷基,R4 代表氢原子或
磷酸残基。这些新型化合物的制备方法是:以
尿苷或
胞苷衍
生物为起始原料,用维蒂希试剂在糖分子的 2'- 位上引入亚烷基。这些化合物具有极佳的抗病毒效果,从而提供了新型抗病毒药物。