[(3aR,5S,6S,7R,7aR)-7-acetyloxy-2-ethylsulfanyl-2,5-dimethyl-5,6,7,7a-tetrahydro-3aH-[1,3]dioxolo[4,5-b]pyran-6-yl] acetate   、                                                                                      
1,2:3,4-di-O-isopropylidene-6-O-trityl-α-D-galactopyranose                                                                                                                                                              在
                                                                                                                                         
triphenylmethyl perchlorate                                                                                                                                                                                                                               2,4,6-三甲基吡啶                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以87%的产率得到1,2:3,4-di-O-isopropylidene-6-O-(2,3,4-tri-O-acetyl-β-L-rhamnopyranosyl)-α-D-galactopyranose