(1S,4S)-4-(tert-Butyl-dimethyl-silanyloxy)-1-{(R)-2-[(1S,2S)-2-(tert-butyl-dimethyl-silanyloxymethyl)-1-methyl-3-methylene-cyclohexyl]-1-methoxymethoxy-ethyl}-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84%的产率得到(4R,5S,8S)-8-(tert-Butyl-dimethyl-silanyloxy)-4-[(1S,2S)-2-(tert-butyl-dimethyl-silanyloxymethyl)-1-methyl-3-methylene-cyclohexylmethyl]-6,10,10-trimethyl-1,3-dioxa-spiro[4.5]dec-6-ene