(6S,13S,17S)-6-hydroxy-2-methoxy-13-methyl-3-(trifluoromethylsulfonyloxy)-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl acetate   、                                                                                      
叔丁基二甲基氯硅烷                                                                                                                                                              在
                                                                                                                                                                                 
咪唑                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
N,N-二甲基甲酰胺                                                                                  为溶剂,
                                                                                                                                                    反应 24.0h,
                                                                                                                以93%的产率得到(6S,13S,17S)-6-(tert-butyldimethylsilyloxy)-2-methoxy-13-methyl-3-(trifluoromethylsulfonyloxy)-7,8,9,11,12,13,14,15,16,17-decahydro-6H-cyclopenta[a]phenanthren-17-yl acetate