2-(1-Methyl-2-oxo-1,2-dihydro-indol-3-ylidene)-malononitrile   、                                                                                      
ethyl 2-[2-(2-oxopropylidene)hydrazino]-4,5,6,7-tetrahydrobenzo[b]thiophene-3-carboxylate                                                                                                                                                              在
                                                                                                                                                                                 
1,8-二氮杂双环[5.4.0]十一碳-7-烯                                                                                                                                  作用下,
                                                                                                                以
                                                                                         
1,4-二氧六环                                                                                  为溶剂,
                                                                                                                                                                                        以78%的产率得到3,3'-spiro(2-acetyl-6-oxo-3,5,6,7,10-pentahydro-11-thia-1,5,11b-triaza-benzo[a]fluorene-4-carbonitrile)-1'-methyl-2'-oxindole