5,5-二甲基-1,3-环己二酮 、
rac-(2E,4E,6E)-5-methyl-7-(2,6-dimethyl-6-ethoxycarbonyl-3-oxo-1-cyclohexenyl)-2,4,6-heptatrienal 在
哌啶 作用下,
以
苯 为溶剂,
以82.5%的产率得到rac-(2E,4E,6E)-2-<5-methyl-7-(2,6-dimethyl-6-ethoxycarbonyl-3-oxo-1-cyclohexenyl)-2,4,6-heptatrienylidene>-5,5-dimethyl-1,3-cyclohexadione