三甲基氯硅烷   、                                                                                      
(5R,8R,9R,10S,13S,14S,17S)-17-tert-Butoxy-13-methyl-hexadecahydro-cyclopenta[a]phenanthren-3-one                                                                                                                                                              在
                                                                                                                                                                                 chiral lithium amide ((S)-5b)                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
正己烷   、                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 0.33h,
                                                                                                                以97%的产率得到((5S,8R,9R,10R,13S,14S,17S)-17-tert-Butoxy-13-methyl-2,5,6,7,8,9,10,11,12,13,14,15,16,17-tetradecahydro-1H-cyclopenta[a]phenanthren-3-yloxy)-trimethyl-silane