methyl 5-acetamido-2,6-anhydro-4-O-(3-cyanopropyl)-3,5-dideoxy-7,8,9-tri-O-acetyl-D-glycero-D-galacto-non-2-enonate                                                                                                                                                              在
                                                                                                                                                                                 
三氟化硼乙醚   、                                                                                                  
硫代乙酸                                                                                                                                  作用下,
                                                                                                                                                                                        反应 12.0h,
                                                                                                                以63%的产率得到methyl 5-acetamido-2,6-anhydro-4-O-(3-thiocarbamoylpropyl)-3,5-dideoxy-7,8,9-tri-O-acetyl-D-glycero-D-galacto-non-2-enonate