2-(trimethylsilyl)ethyl 2,3,4-tri-O-benzoyl-6-O-chloroacetyl-β-D-galactopyranosyl-(1->6)-2,3,4-tri-O-benzoyl-β-D-galactopyranosyl-(1->6)-2,3,4-tri-O-benzoyl-β-D-galactopyranoside                                                                                                                                                              在
                                                                                                                                                                                 
吡啶   、                                                                                                  
硫脲                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                    反应 2.5h,
                                                                                                                以85%的产率得到2-(trimethylsilyl)ethyl 2,3,4-tri-O-benzoyl-β-D-galactopyranosyl-(1->6)-2,3,4-tri-O-benzoyl-β-D-galactopyranosyl-(1->6)-2,3,4-tri-O-benzoyl-β-D-galactopyranoside