(1R,4S)-1-{(S)-2-[(1S,2S,6S)-6-tert-Butoxy-2-(tert-butyl-dimethyl-silanyloxymethyl)-1-methyl-3-methylene-cyclohexyl]-1-methoxymethoxy-ethyl}-4-(tert-butyl-dimethyl-silanyloxy)-2,6,6-trimethyl-cyclohex-2-enol                                                                                                                                                              在
                                                                                                                                                                                 
2,3,5-三甲基吡啶   、                                                                                                  
三氟甲磺酸三甲基硅酯                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 2.0h,
                                                                                                                以82%的产率得到(4S,5R,8S)-4-[(1S,2S,6S)-6-tert-Butoxy-2-(tert-butyl-dimethyl-silanyloxymethyl)-1-methyl-3-methylene-cyclohexylmethyl]-8-(tert-butyl-dimethyl-silanyloxy)-6,10,10-trimethyl-1,3-dioxa-spiro[4.5]dec-6-ene