(E)-dimethyl 2-(4-methyl-5-phenylpent-4-enyl)malonate 在
manganese(III) triacetate dihydrate 、 copper(II) bis(trifluoromethanesulfonate) 作用下,
以
乙腈 为溶剂,
生成 methyl 6a-methyl-3-oxo-1-phenylhexahydro-1H-cyclopenta[c]furan-3a-carboxylate 、 methyl 6a-methyl-3-oxo-1-phenylhexahydro-1H-cyclopenta[c]furan-3a-carboxylate