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