3,4,6-tri-O-acetyl-2-deoxy-2-[1-(4,4-dimethyl-2,6-dioxocyclohex-1-ylidene)-ethylamino]-α-D-glucopyranosyl bromide   、                                                                                      
2-氯乙氧基-2-乙氧基二乙醇                                                                                                                                                              在
                                                                                                                                                                                 molecular sieve   、                                                                                                  
silver trifluoromethanesulfonate                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,2-二氯乙烷                                                                                  为溶剂,
                                                                                                                                                    反应 1.0h,
                                                                                                                以84%的产率得到(2R,3S,4R,5R)-2-(acetoxymethyl)-6-(2-(2-(2-chloroethoxy)ethoxy)ethoxy)-5-((1-(4,4-dimethyl-2,6-dioxocyclohexylidene)ethyl)amino)tetrahydro-2H-pyran-3,4-diyl diacetate