A process for producing 2',3'-dideoxy-2',3'-didehydronucleoside useful as the starting material of medicines readily at a low cost, which comprises the step (a) of reacting a ribonucleoside derivative of general formula (II) with an acid anhydride in the presence of a catalyst to obtain an intermediate of general formula (III) and the step (b) of decarboxylating the intermediate (III) under a neutral or basic condition to obtain 2',3'-dideoxy-2',3'-didehydronucleoside of general formula (I), wherein R¹ represents optionally protected hydroxy; R² and R³ represent each optionally substituted alkyl or phenyl; and B represents a purine or pyrimidine nucleic acid base.
一种以低成本生产可用作药物起始原料的 2',3'-二脱氧-2',3'-二脱氢核苷的工艺、该工艺包括步骤(a) 在催化剂存在下,使通式(II)的
核糖核苷衍
生物与酸酐反应,得到通式(III)的中间体;步骤(b) 在中性或碱性条件下,使中间体(III)脱羧,得到通式(I)的 2',3'-二脱氧-2',3'-二脱氢核苷,其中 R¹ 代表任选受保护的羟基;R² 和 R³ 分别代表任选取代的烷基或苯基;以及 B 代表
嘌呤或
嘧啶核酸碱基。