methyl 5-acetamido-7-O-acetyl-2,6-anhydro-4-azido-3,4,5-trideoxy-8,9-O-isopropylidene-D-glycero-D-galacto-non-2-enonic acid 在
Dowex 50W-X
8 (H+) resin 作用下,
以
水 为溶剂,
反应 3.0h,
以76%的产率得到methyl 5-acetamido-7-O-acetyl-2,6-anhydro-4-azido-3,4,5-trideoxy-D-glycero-D-galacto-non-2-enonic acid