A tandem intramolecular conjugate addition reaction was conducted with α,β-bisenones
as selected Michael acceptors which were converted into 1,2,3-trisubstituted six-membered
rings in the presence of activated sulfur nucleophiles. The products were obtained
in good to excellent yields (maximum yield: 99%). Various substituted α,β-bisenones
and sulfur nucleophiles were examined to understand the substrate scope of the reaction.
Only one diastereomer was isolated, as lithium iodide mediated enolate trapping reactions
improve the stereoselectivity of reactions involving 1,2,3-trisubstituted cyclohexanes.
Key words
stereoselectivity - tandem conjugate addition - lithium iodide - α,β-bisenones - thiols