重氮甲烷   、                                                                                      
diphenylmethyl 7-acetoxymethyl-9-chloro-5-cyano-8,11-dioxo-10-hydroxy-13-methyl-1,2,3,4,5,7,8,11,12,12a-decahydro-1,4-iminoazepino<1,2-b>isoquinoline-2-carboxylate                                                                                                                                                                                              以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                                                        以80.8%的产率得到diphenylmethyl 7-acetoxymethyl-9-chloro-5-cyano-8,11-dioxo-10-methoxy-13-methyl-1,2,3,4,5,7,8,11,12,12a-decahydro-1,4-iminoazepino<1,2-b>isoquinoline-2-carboxylate