In the presence invention, a (2R)-2-fluoro-2-C-methyl-D-ribono-γ-lactone precursor is produced in the form of a ring-opened fluorinated compound by reaction of a 1,2-diol with sulfuryl fluoride (SO2F2) in the presence of an organic base and, optionally, a fluoride ion source. The production method of the present invention secures less number of process steps as compared to the conventional production method (shortening of three steps: cyclic sulfurous esterification, oxidation and ring-opening fluorination to one step) and satisfies the requirements for industrial production (high yield and high reproductivity). The thus-obtained (2R)-2-fluoro-2-C-methyl-D-ribono-γ-lactone precursor is useful as an important intermediate for the synthesis of 2'-deoxy-2'-fluoro-2'-C-methylcytidine with antivirus activity.
在本发明中,(2R)-2-
氟-2-C-甲基-
D-核糖酸-γ-内酯前体是通过 1,2
-二醇与
硫酰氟 (SO2F2) 在有机碱和可选的
氟离子源存在下反应生成开环
氟化化合物形式的。与传统生产方法相比,本发明的生产方法减少了工艺步骤(将环
硫酯化、氧化和开环
氟化三个步骤缩短为一个步骤),并满足了工业生产的要求(高产率和高重复性)。由此获得的(2R)-2-
氟-2-C-甲基-
D-核糖酸-γ-内酯前体是合成具有抗病毒活性的 2'-deoxy-2'-fluoro-2'-C-methylcytidine 的重要中间体。