benzyl O-(2,4,6-tri-O-benzyl-β-D-glucopyranosyl)-(1-4)-O-(2,3,6-tri-O-benzyl-β-D-glucopyranosyl)-(1-4)-2,3,6-tri-O-benzyl-β-D-glucopyranoside   、                                                                                      
2,3,4,6-四乙酰氧基-alpha-D-吡喃葡萄糖溴化物                                                                                                                                                              在
                                                                                                                                         
silver trifluoromethanesulfonate                                                                                                                                                                                                                               4 A molecular sieve                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,2-二氯乙烷                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以83%的产率得到benzyl O-(2,3,4,6-tetra-O-acetyl-β-D-glucopyranosyl)-(1-3)-O-(2,4,6-tri-O-benzyl-β-D-glucopyranosyl)-(1-4)-O-(2,3,6-tri-O-benzyl-β-D-glucopyranosyl)-(1-4)-2,3,6-tri-O-benzyl-β-D-glucopyranoside