5-{1-[3,3-Dimethyl-5-thioxo-pyrrolidin-(2Z)-ylidene]-ethyl}-2,3,3-trimethyl-3,4-dihydro-2H-pyrrole-2-carbonitrile 、
5-(5-iodomethylene-4,4-dimethyl-4,5-dihydro-3H-pyrrol-2-ylmethylene)-4,4-dimethyl-pyrrolidin-2-one 在
1,8-二氮杂双环[5.4.0]十一碳-7-烯 作用下,
以58%的产率得到5-{1-[5-[5-[3,3-Dimethyl-5-oxo-pyrrolidin-(2Z)-ylidenemethyl]-3,3-dimethyl-3,4-dihydro-pyrrol-(2Z)-ylidenemethylsulfanyl]-3,3-dimethyl-3,4-dihydro-pyrrol-(2Z)-ylidene]-ethyl}-2,3,3-trimethyl-3,4-dihydro-2H-pyrrole-2-carbonitrile