(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