碘苯二乙酸   、                                                                                      
methyl 2,3,4-tri-O-acetyl-α-L-rhamnopyranosyl-(1->4)-6-deoxy-6-(4-methoxyphenylsulfonylamino)-2,3-di-O-methyl-α-D-galactopyranoside                                                                                                                                                              在
                                                                                                                                                                                 
碘                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以32%的产率得到methyl 5-acetoxy-2,3,4-tri-O-acetyl-α-L-rhamnopyranosyl(1->4)-6-deoxy-2,3-di-O-methyl-6-(4-methoxyphenylsulfonylamino)-α-D-galactopyranoside