Acetic acid (2S,5R,6R)-6-bromo-5-(2,4-dinitro-phenylamino)-tetrahydro-pyran-2-ylmethyl ester   、                                                                                      
methyl 4,6-O-benzylidene-2-(benzyloxycarbonyl)amino-2-deoxy-α-D-glucopyranoside                                                                                                                                                              在
                                                                                                                                                                                 
2,4,6-三甲基吡啶   、                                                                                                  silver perchlorate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,4-二氧六环   、                                                                                         
苯                                                                                  为溶剂,
                                                                                                                                                    反应 0.25h,
                                                                                                                以68%的产率得到Acetic acid (2S,5R,6R)-6-((4aR,6S,7R,8R,8aS)-7-benzyloxycarbonylamino-6-methoxy-2-phenyl-hexahydro-pyrano[3,2-d][1,3]dioxin-8-yloxy)-5-(2,4-dinitro-phenylamino)-tetrahydro-pyran-2-ylmethyl ester