methyl 2-O-benzoyl-3-O-benzyl-4-O-levulinoyl-β-D-glucopyranosyluronate-(1->3)-4-O-acetyl-6-O-benzyl-2-deoxy-2-trichloroacetamido-D-glucopyranoside   、                                                                                      
三氯乙腈                                                                                                                                                              在
                                                                                                                                                                                 
1,8-二氮杂双环[5.4.0]十一碳-7-烯                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以52%的产率得到methyl 2-O-benzoyl-3-O-benzyl-4-O-levulinoyl-β-D-glucopyranosyluronate-(1->3)-4-O-acetyl-6-O-benzyl-2-deoxy-2-trichloroacetamido-α-D-glucopyranosyl-trichloroacetimidate