乙酸酐 、
methyl (2-O-allyl 5-O-tert-butyldimethylsilyl-7,8-O-cyclohexylidene-3-deoxy-α-D-manno-oct-2-ulopyranosid)onate 在
吡啶 作用下,
反应 12.0h,
以83%的产率得到methyl (allyl 4-O-acetyl-5-O-tert-butyldimethylsilyl-7,8-O-cyclohexylidene-3-deoxy-α-D-manno-oct-2-ulopyranosid)onate