乙酸酐   、                                                                                      
Acetic acid (3S,5R,8S,9S,10R,13R,14S,17R)-17-[(R)-2-acetoxy-1-((R)-2-hydroxy-5,5-dimethyl-tetrahydro-furan-2-yl)-ethyl]-4,4,13,14-tetramethyl-tetradecahydro-cyclopropa[9,10]cyclopenta[a]phenanthren-3-yl ester                                                                                                                                                              在
                                                                                                                                                                                 
吡啶                                                                                                                                  作用下,
                                                                                                                                                                                        反应 3.0h,
                                                                                                                生成                                                 Acetic acid (3S,5R,8S,9S,10R,13R,14S,17R)-17-[(R)-2-acetoxy-1-((S)-2-acetoxy-5,5-dimethyl-tetrahydro-furan-2-yl)-ethyl]-4,4,13,14-tetramethyl-tetradecahydro-cyclopropa[9,10]cyclopenta[a]phenanthren-3-yl ester