乙酸酐   、                                                                                      
5-t-butyldiphenylsiloxymethyl-4',5'-dihydroxy-6'-methoxy-2,2-dimethyl-(3'R,3aR,4'S,5S,5'R,6S,6'R,6aR)-spiro[perhydrofuro[2,3-d][1,3]dioxole-6,2'-(3'H,6'H-pyran)]-3'-yl acetate                                                                                                                                                              在
                                                                                                                                                                                 
N-甲基吗啉   、                                                                                                  
三乙胺                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        以76%的产率得到5-t-butyldiphenylsiloxymethyl-3',4'-di(methylcarbonyloxy)-6'-methoxy-2,2-dimethyl-(3'R,3aR,4'R,5S,5'R,6S,6'R,6aR)-spiro[perhydrofuro[2,3-d][1,3]dioxole-6,2'-(3'H,6'H-pyran)]-5'-yl acetate