3-(4-Bromo-butyl)-imidazolidine-2,4-dione   、                                                                                      
(+)-4a,9b-trans-8-fluoro-5-(4-fluorophenyl)-1,2,3,4,4a,9b-hexahydro-γ-carboline                                                                                                                                                              在
                                                                                                                                                                                 
sodium carbonate   、                                                                                                  potassium iodide                                                                                                                                  作用下,
                                                                                                                以
                                                                                         various solvent(s)                                                                                  为溶剂,
                                                                                                                                                                                        以16%的产率得到3-{4-[(4aS,9bS)-8-Fluoro-5-(4-fluoro-phenyl)-1,3,4,4a,5,9b-hexahydro-pyrido[4,3-b]indol-2-yl]-butyl}-imidazolidine-2,4-dione