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