sodium [(2,3-difluorobenzyl) 5-acetamido-9-(4-chlorobenzamido)-3,5,9-trideoxy-7,8-O-isopropylidene-D-glycero-α-D-galacto-2-nonulopyranosid]onate   、                                                                                      
乙酸酐                                                                                                                                                              在
                                                                                                                                                                                 
4-二甲氨基吡啶                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
吡啶                                                                                  为溶剂,
                                                                                                                                                                                        以80%的产率得到sodium [(2,3-difluorobenzyl) 5-acetamido-4-O-acetyl-9-(4-chlorobenzamido)-3,5,9-trideoxy-7,8-O-isopropylidene-D-glycero-α-D-galacto-2-nonulopyranosid]onate