异氰酸正丁酯   、                                                                                      
methyl trans-1'-(4-methoxyphenyl)-2',3',4',9'-tetrahydrospiro[cyclopropane-1,4'-1H-β-carboline]-3'-carboxylate                                                                                                                                                                                              以
                                                                                         
丁酮                                                                                  为溶剂,
                                                                                                                                                    反应 12.0h,
                                                                                                                以91%的产率得到trans-2'-butyl-10'-(4-methoxyphenyl)-3a',4',9',10'-tetrahydrospiro[cyclopropane-1,4'-(2',9',11'-triazacyclopenta[b]fluorene)]-1',3'-dione