乙酸酐 、
methyl (methyl 5-acetamido-4,7-di-O-acetyl-9-O-benzoyl-3,5-dideoxy-β-D-glycero-D-galacto-2-nonulopyranosid)onate 在
吡啶 作用下,
反应 12.0h,
以95%的产率得到methyl (methyl 5-acetamido-4,7,8-tri-O-acetyl-9-O-benzoyl-3,5-dideoxy-β-D-glycero-D-galacto-2-nonulopyranosid)onate