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DOI: 10.1055/s-0031-1289629
Enantio- and Diastereoselective Synthesis of β,γ,γ,δ-Tetrasubstituted α-Methylene-δ-lactones
Publication History
Publication Date:
01 December 2011 (online)
Abstract
The synthesis of two α-(diethoxyphosphoryl)-α,β-unsaturated δ-lactones with 98% ee has been developed using (S)-3-aryl-3-hydroxy-2,2-dimethylpropanals, easily accessible via direct, asymmetric organocatalytic aldol reaction, as the starting materials. The lactones were transformed into the corresponding α-methylene-δ-lactones in a two-step process involving Michael addition followed by Horner-Wadsworth-Emmons olefination without loss of enantiomeric purity. Furthermore, it was shown that diastereoselectivity of the Michael addition can be fully controlled by the C6 stereogenic center in the intermediate lactones. A transition-state model rationalizing the stereochemical outcome of the reaction was proposed.
Key words
Knoevenagel condensation - Michael addition - HWE olefination - β-hydroxyaldehydes - α-methylene-δ-lactones
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References
Crystallographic data (excluding structure factors) for the structure reported herein have been deposited with the Cambridge Crystallographic Data Centre as supplementary publication CCDC 822405. Copies of the data can be obtained free of charge on application to The Director, CCDC, 12 Union Road, Cambridge CB2 1EZ, UK. Any request should be accompanied by a full literature citation.