methyl (methyl 5-acetamido-9-azido-2-thio-3,5,9-trideoxy-D-glycero-D-galacto-2-nonulopyranosid)onate 、
乙酸酐 在
吡啶 、
4-二甲氨基吡啶 作用下,
以90%的产率得到methyl (methyl 5-acetamido-4,7,8-tri-O-acetyl-9-azido-2-thio-3,5,9-trideoxy-D-glycero-D-galacto-2-nonulopyranosid)onate