Provided is a method for preparing 3-O-benzyl-1,2-O-isopropylidene-α-L-idofuranose, which comprises: (1) protecting hydroxyl of 3-O-benzyl-1,2-O-isopropylidene-α-D-glucofuranose (III) by benzoyl and methylsulfonyl to obtain 6-O-benzoyl-3-O-benzyl-1,2-O-isopropylidene-5-O-methylsulfonyl-α-D-glucofuranose (V); (2) subjecting compound (V) to a cyclization reaction under an alkaline condition to obtain 5,6-epoxy-3-O-benzyl-1,2-O-isopropylidene-α-L-idofuranose (VI); and (3) subjecting compound (VI) to a ring-opening reaction to obtain 3-O-benzyl-1,2-O-isopropylidene-α-L-idofuranose.
提供了一种制备3-O-苄基-1,2-O-异丙基亚-L-伊多呋糖的方法,包括:(1)通过苯甲酰和甲磺酰保护3-O-苄基-1,2-O-异丙基α-
D-葡糖呋糖(III)的羟基,以获得6-O-苯甲酰-3-O-苄基-1,2-O-异丙基-5-O-甲基磺酰-α-
D-葡糖呋糖(V);(2)在碱性条件下将化合物(V)进行环化反应,以获得5,6-环氧-3-O-苄基-1,2-O-异丙基亚-L-伊多呋糖(VI);(3)将化合物(VI)进行开环反应,以获得3-O-苄基-1,2-O-异丙基亚-L-伊多呋糖。