(1S,5R)-5-(tert-Butyl-diphenyl-silanyloxy)-3-[2-[(R)-1-[(S)-2-(2-hydroxy-2-methyl-propoxy)-1-methyl-ethyl]-7a-methyl-octahydro-inden-(4E)-ylidene]-eth-(Z)-ylidene]-2-methylene-cyclohexanol 以65%的产率得到(4S,6R)-6-(tert-Butyl-diphenyl-silanyloxy)-8-[2-[(R)-1-[(S)-2-(2-hydroxy-2-methyl-propoxy)-1-methyl-ethyl]-7a-methyl-octahydro-inden-(4E)-ylidene]-eth-(Z)-ylidene]-spiro[2.5]octan-4-ol