(6aR,7aS,8aS,9aR)-tert-butyl-(9a-ethyl-7a-phenyl-5,6,6a,7,7a,8a,9,9a-octahydro-8-oxacyclopropa[b]phenanthren-3-yloxy)dimethylsilane                                                                                                                                                              在
                                                                                                                                                                                 
三氟化硼乙醚                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
二氯甲烷                                                                                  为溶剂,
                                                                                                                                                                                        生成                                                 
(2S,4aR,10aR)-7-[tert-butyl(dimethyl)silyl]oxy-4a-ethyl-2-phenyl-1,2,4,9,10,10a-hexahydrophenanthren-3-one