Treatment of 1,1-dichloro-2-ethyl-3-hexylcyclopropane (4) with KOBut in dimethyl sulphoxide gives 1-hexylidene-2-vinylcyclopropane (5) which is converted into (±)-dictyopterene A (1) and its geometrical isomers after prolonged treatment with the base; thermolysis of these stereoisomers gives (±)-dictyopterene C′(2) in 60% yield.
W. E. Billups, W. Y. Chow and J. H. Cross, J. Chem. Soc., Chem. Commun., 1974, 252 DOI: 10.1039/C39740000252
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