Intramolecular conjugate addition of γ-substituted (E)- α,β-unsaturated ketones with a Lewis acid (BF3· OEt2) selectively afforded trans-2,3-disubstituted piperidine derivatives. Chiral substrates were synthesized by Sharpless asymmetric dihydroxylation of the enamine; the antimalarial compound febrifugine was synthesized from the major product of the conjugate addition reaction.
- Asymmetric synthesis
- Intramolecular conjugate addition
- Lewis acid
ASJC Scopus subject areas
- Organic Chemistry