The present invention relates to a novel process for preparing uracil derivatives useful as intermediates in the synthesis of uridines having antiviral or antitumor activity or useful as coadjuvants in antiviral therapy, characterized by converting a compound of the formula II into its mesylate derivative of the formula III which is the reduced to give the desired compound of the formula I: ##STR1## in which R.sub.1 is H, halogen, alkyl, aryl or aralkyl.
本发明涉及一种新型制备尿
嘧啶衍
生物的方法,该方法可用作合成具有抗病毒或抗肿瘤活性的
尿苷中间体,或者作为抗病毒治疗的辅助剂,其特征在于将式II的化合物转化为其式III的
甲磺酸酯衍
生物,然后还原得到所需的式I的化合物:##STR1## 其中R.sub.1为H、卤素、烷基、芳基或芳基烷基。