benzyl 2-amino-2-deoxy-β-D-galactopyranosyl-(1->3)-2-acetamido-4,6-di-O-benzyl-2-deoxy-α-D-galactopyranoside   、                                                                                      
乙酸酐                                                                                                                                                              在
                                                                                                                                                                                 
吡啶                                                                                                                                  作用下,
                                                                                                                                                                                        反应 24.0h,
                                                                                                                以266 mg的产率得到benzyl 2-acetamido-3,4,6-tri-O-acetyl-2-deoxy-β-D-galactopyranosyl-(1->3)-2-acetamido-4,6-di-O-benzyl-2-deoxy-α-D-galactopyranoside