This invention relates to an improved method for stereoselectively preparing 2¢¥-deoxy-2¢¥,2¢¥-difluorocytidine of formula (I), which comprises the steps of reacting a 1-halo ribofuranose compound of formula (III) with a nucleobase of formula (IV) in a solvent to obtain a nucleoside of formula (II) with removing the silyl halide of formula (V) produced during the reaction; and deprotecting the nucleoside of formula (II) to obtain 2¢¥-deoxy-2¢¥,2¢¥-difluorocytidine of formula (I).
这项发明涉及一种改进的立体选择性制备式(I)的2'-脱氧-2',2'-二
氟胞苷的方法,包括以下步骤:在溶剂中将式(III)的1-卤代
核糖化合物与式(IV)的核碱基反应,得到式(II)的核苷,去除反应过程中产生的式(V)的
硅基卤代物;脱保护式(II)的核苷,得到式(I)的2'-脱氧-2',2'-二
氟胞苷。