3(R)-2-(2-chloroacetyl)-1-(3,4-dimethoxyphenyl)-2,3,4,9-tetrahydro-1H-β-carboline-3-carboxylic acid methyl ester   、                                                                                      
(R)-1-苄基-3-氨基吡咯烷                                                                                                                                                                                              以
                                                                                         
甲醇                                                                                  为溶剂,
                                                                                                                                                                                        以23%的产率得到(6S,12aR)-2-((R)-1-benzylpyrrolidin-3-yl)-6-(3,4-dimethoxyphenyl)-2,3,6,7,12,12a-hexahydropyrazino[1',2':1,6]pyrido[3,4-b]indole-1,4-dione