(1R,2RS,4aR,4bR,8aR,10aS)-2-tert-butyldiphenylsilyloxymethyl-7-ethylenedioxy-1,2,4a,4b,5,6,7,8,8a,9,10,10a-dodecahydro-1,4b,8,8-tetramethylphenanthrene 在
四丁基氟化铵 作用下,
以
四氢呋喃 为溶剂,
以74%的产率得到[(1'R,4'aS,4'bR,8'aR,10'aS)-1',4'b,8',8'-tetramethylspiro[1,3-dioxolane-2,7'-2,4a,5,6,8a,9,10,10a-octahydro-1H-phenanthrene]-2'-yl]methanol