2,3-丁二烯酸乙酯 、
3,5-Bis(thiophen-2-ylmethylidene)thian-4-one 在
(S,S)-1,1'-bis(trimethylsilyl)-2,2'-(2-cyclohexyl-2-phospha-1,3-propanediyl)ferrocene 作用下,
以
甲苯 为溶剂,
以80%的产率得到ethyl 10-oxo-4-(thiophen-2-yl)-9-(thiophen-2-ylmethylene)-7-thiaspiro[4.5]dec-1-ene-1-carboxylate