Methyl O-(2,3,6-tri-O-benzyl-α-D-glucopyranosyl)-(1->4)-O-(tert-butyl 2,3-di-O-benzyl-β-D-glucopyranoside)uronate   、                                                                                      
Ethyl O-(2,3-di-O-benzoyl-4,6-O-benzylidene-α-D-glucopyranosyl)-(1->4)-O-(tert-butyl 2,3-di-O-benzoyl-1-thio-β-D-glucopyranoside)uronate                                                                                                                                                              在
                                                                                                                                                                                 
N-碘代丁二酰亚胺   、                                                                                                  4 A molecular sieve   、                                                                                                  
silver trifluoromethanesulfonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以74%的产率得到Methyl O-(2,3-di-O-benzoyl-4,6-O-benzylidene-α-D-glucopyranosyl)-(1->4)-O-(tert-butyl 2,3-di-O-benzoyl-β-D-glucopyranosyl)uronate-(1->4)-O-(2,3,6-tri-O-benzyl-α-D-glucopyranosyl)-(1->4)-O-(tert-butyl 2,3-di-O-benzyl-β-D-glucopyranosyl)uronate