allyl 3,6-di-O-benzyl-α-D-mannopyranoside   、                                                                                      methyl O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-(1->4)-3,6-di-O-acetyl-2-deoxy-2-phthalimido-1-thio-β-D-glucopyranoside                                                                                                                                                              在
                                                                                                                                                                                 
三氟甲烷磺酸甲酯                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
乙醚   、                                                                                         
1,2-二氯乙烷                                                                                  为溶剂,
                                                                                                                                                                                        以36%的产率得到allyl O-(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-(1->4)-O-(3,6-di-O-acetyl-2-deoxy-2-phthalimido-β-D-glucopyranosyl)-(1->2)-O-<(2,3,4,6-tetra-O-acetyl-β-D-galactopyranosyl)-(1->4)-O-(3,6-di-O-acetyl-2-deoxy-2-phthalimido-β-D-glucopyranosyl)-...