7-O-acetyl-6-O-allyl-2-O-benzoyl-4-O-benzyl-3-O-chloroacetyl-L-glycero-α-D-manno-heptopyranosyl-(1->3)-[2,3,4,6-tetra-O-benzoyl-β-D-glucopyranosyl-(1->4)]-1,6,7-tri-O-acetyl-2-O-benzyl-L-glycero-α-D-manno-heptopyranoside   、                                                                                      
乙硫醇                                                                                                                                                              在
                                                                                                                                                                                 
三氟化硼乙醚                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                以69%的产率得到ethyl 7-O-acetyl-6-O-allyl-2-O-benzoyl-4-O-benzyl-3-O-chloroacetyl-L-glycero-α-D-manno-heptopyranosyl-(1->3)-[2,3,4,6-tetra-O-benzoyl-β-D-glucopyranosyl-(1->4)]-6,7-tri-O-acetyl-2-O-benzyl-1-thio-L-glycero-α-D-manno-heptopyranoside