2-氨基苯并咪唑   、                                                                                      
(5S,8R,9S,10S,13S,14S,17R)-17-Ethynyl-2-[1-hydroxy-meth-(Z)-ylidene]-17-methoxy-10,13-dimethyl-hexadecahydro-cyclopenta[a]phenanthren-3-one                                                                                                                                                                                              以
                                                                                         
乙醇                                                                                  为溶剂,
                                                                                                                                                                                        以64%的产率得到(3S,4S,7S,8R,11S,12R,15S)-8-ethynyl-8-methoxy-3,7-dimethyl-18,20,27-triazaheptacyclo[15.11.0.03,15.04,12.07,11.019,27.021,26]octacosa-1(28),17,19,21,23,25-hexaene