4-(tert-Butyl-diphenyl-silanyloxy)-3-methanesulfonyloxy-2-[2-((1S,4aS,4bR,8aR,10aR)-2,4b,8,8,10a-pentamethyl-1,4,4a,4b,5,6,7,8,8a,9,10,10a-dodecahydro-phenanthren-1-yl)-ethyl]-butyric acid methyl ester                                                                                                                                                              在
                                                                                                                                                                                 
1,8-二氮杂双环[5.4.0]十一碳-7-烯                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
甲苯                                                                                  为溶剂,
                                                                                                                                                    反应 4.0h,
                                                                                                                生成                                                 methyl (Z)-2-[2-[(1S,4aS,4bR,8aR,10aR)-2,4b,8,8,10a-pentamethyl-4,4a,5,6,7,8a,9,10-octahydro-1H-phenanthren-1-yl]ethyl]-4-[tert-butyl(diphenyl)silyl]oxybut-2-enoate   、                                                                                             methyl (E)-2-[2-[(1S,4aS,4bR,8aR,10aR)-2,4b,8,8,10a-pentamethyl-4,4a,5,6,7,8a,9,10-octahydro-1H-phenanthren-1-yl]ethyl]-4-[tert-butyl(diphenyl)silyl]oxybut-2-enoate