、                                                                                      
methyl (methyl 2-O-acetyl-3-O-benzyl-α-L-idopyranosyluronate)-(1-4)-(2-azido-3-O-benzyl-6-O-tert-butyldiphenylsilyl-2-deoxy-α-D-glucopyranosyl)-(1-4)-(methyl 2-O-acetyl-3-O-benzyl-α-L-idopyranosyluronate)-(1-4)-3-O-benzyl-2-benzyloxycarbonylamino-6-O-tert-butyldiphenylsilyl-2-deoxy-α-D-glucopyranoside                                                                                                                                                              在
                                                                                                                                                                                 
叔丁基二甲硅基三氟甲磺酸酯   、                                                                                                  
碳酸氢钠                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 1.83h,
                                                                                                                生成                                                 methyl (methyl 2-O-acetyl-3-O-benzyl-4-O-levulinoyl-α-L-idopyranosyluronate)-(1-4)-(6-O-acetyl-2-azido-3-O-benzyl-2-deoxy-α-D-glucopyranosyl)-(1-4)-(methyl 2-O-acetyl-3-O-benzyl-α-L-idopyranosyluronate)-(1-4)-(2-azido-3-O-benzyl-6-O-tert-butyldiphenylsilyl-2-deoxy-α-D-glucopyranosyl)-(1-4)-(methyl 2-O-acetyl-3-O-benzyl-α-L-idopyranosyluronate)-(1-4)-3-O-benzyl-2-benzyloxycarbonylamino-6-O-tert-butyldiphenylsilyl-2-deoxy-α-D-glucopyranoside