A method for producing a pyrimidine nucleoside compound includes reacting a sugar phosphate and pyrimidine base derivative using an enzyme having cytosine nucleoside phosphorylase activity, the pyrimidine base derivative being represented by general formula (I):
(wherein R1 represents an amino group that may be replaced with an acyl group having an alkyl group of 1 to 3 carbon atoms or an alkyl group of 1 to 3 carbon atoms, an alkyl group of 1 to 3 carbon atoms, or a thiol group; R2 represents an amino group, a thiol group, a hydroxyl group, or a hydrogen atom; R3 represents an alkyl group of 1 to 3 carbon atoms that may be replaced with a hydroxyl group, an amino group, or a hydrogen atom; R4 represents a hydroxyl group or a hydrogen atom; when R1 is an amino group, when R2 is a hydroxyl group, and when R4 is a hydrogen atom; R3 is neither an alkyl group of 1 to 3 carbon atoms nor a hydrogen atom).
生产
嘧啶核苷化合物的方法包括使用具有
胞嘧啶核苷化酶活性的酶,通过反应糖
磷酸和
嘧啶碱基衍
生物来实现,其中
嘧啶碱基衍
生物由通用式(I)表示:(其中R1代表一个
氨基,可以被具有1至3个碳原子的烷基或1至3个碳原子的烷基,1至3个碳原子的烷基或
硫醇基替代;R2代表一个
氨基,
硫醇基,羟基或氢原子;R3代表1至3个碳原子的烷基,可以被羟基,
氨基或氢原子替代;R4代表羟基或氢原子;当R1是
氨基时,当R2是羟基时,当R4是氢原子时;R3既不是1至3个碳原子的烷基也不是氢原子)。