碘苯二乙酸   、                                                                                      
methyl 2,3,4-tri-O-acetyl-α-D-lyxopyranosyl(1->4)-6-deoxy-2,3-di-O-methyl-6-(4-nitrophenylsulfonylamino)-α-D-glucopyranoside                                                                                                                                                              在
                                                                                                                                                                                 
碘                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 3.0h,
                                                                                                                生成                                                 methyl 5β-acetoxy-2,3,4-tri-O-acetyl-α-D-lyxopyranosyl(1->4)-6-deoxy-2,3-di-O-methyl-6-(4-nitrophenylsulfonylamino)-α-D-glucopyranoside   、                                                                                             methyl 5α-acetoxy-2,3,4-tri-O-acetyl-α-D-lyxopyranosyl(1->4)-6-deoxy-2,3-di-O-methyl-6-(4-nitrophenylsulfonylamino)-α-D-glucopyranoside