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