An object of the present invention is to provide a industrially appropriate method for producing the β-anomers of ribofuranose derivatives in a highly selective manner at a high yield. The present invention provides a method for producing ribofuranose derivatives wherein β-anomers is precipitated from among the generated furanose derivatives by controlling the amount of a reaction reagent used and/or using a poor solvent in the acetolysis reactions of 2,3,5-tri-O-acyl-
1
-O-alkyl-ribofuranose and 2,3-di-O-acyl-
1
-O-alkyl-5-deoxy-ribofuranose.
本发明的目的是提供一种工业上适用的方法,以高选择性和高产率生产
核黄素糖苷衍
生物的β-异构体。本发明提供了一种生产
核黄素糖苷衍
生物的方法,其中通过控制反应试剂的用量和/或使用劣质溶剂,在2,3,5-三-O-酰基-1-O-烷基-
核黄素糖苷和2,3-二-O-酰基-1-O-烷基-5-去氧-
核黄素糖苷的乙酰化反应中沉淀β-异构体。