A Conformationally Controlled Regioselective Rearrangement of 2-Substituted 1-Alkynylcyclopropanols to 2-Cyclopenten-1-ones via Hexacarbonyldicobalt Complex

Abstract

Abstract The rearrangement of hexacarbonyldicobalt-complexed 2-substituted 1-alkynylcyclopropanol derivatives is conformationally controlled to give 4- or 5-substituted 2-cyclopentenones regioselectively. In the cases of the reactions of 2-monosubstituted 1-alkynylcyclopropanol derivatives, either regioisomer can be selectively obtained by the appropriate choice of the substrates.