Abstract
Intermolecular Pauson–Khand reaction of fluoroalkylated alkynes with 2-norbornene or 2,5-norbornadiene at the reflux temperature of dichloroethane proceeded smoothly to give the corresponding cyclopentenone derivatives in high yields as a mixture of regioisomers. On the other hand, intramolecular Pauson–Khand reaction of fluorine-containing 1,6-enyne proceeded in the presence of NMO or TMANO to give the bicyclic adducts in good yields. Additionally, allyl CF3-propargyl ether also underwent a smooth Pauson–Khand reaction in the presence of amine oxide, the corresponding bicyclic compounds being obtained in a highly diastereoselective manner.
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