ethyl (E)-3-[5-[(E)-3-ethoxy-3-oxo-prop-1-enyl]-2,2-dimethyl-1,3-dioxolan-4-yl]prop-2-enoate 、
环戊二烯 、
氯化二乙基铝 生成 ethyl (2S,3S)-3-[(4R,5R)-5-[(2S,3S)-3-ethoxycarbonyl-2-bicyclo[2.2.1]hept-5-enyl]-2,2-dimethyl-1,3-dioxolan-4-yl]bicyclo[2.2.1]hept-5-ene-2-carboxylate