A regio‐ and enantioselective copper‐catalyzed 1,4‐conjugateaddition of trimethylaluminium to linear δ‐aryl‐substituted α,β,γ,δ‐unsaturated alkyl ketones was developed. A series of γ,δ‐unsaturated alkyl ketones were obtained in good yields with high regio‐ and enantioselectivity (up to 88% ee and 96:4 dr). Expansion of the reaction scope to substrates containing aromatic heterocycles also afforded
Regioselective and Enantioselective Addition of Sulfur Nucleophiles to Acyclic α,β,γ,δ-Unsaturated Dienones Catalyzed by an Iron(III)–Salen Complex
作者:Subrata Shaw、James D. White
DOI:10.1021/acs.orglett.5b02280
日期:2015.9.18
The first regioselective, enantioselective conjugate addition of thiols to acyclic α,β,γ,δ-unsaturated dienones at the δ carbon is described. The reaction, catalyzed by a chiral iron(III)-salen complex derived from cis-2,5-diaminobicyclo[2.2.2]octane as the scaffold, provides δ-thia-α,β-unsaturated ketones in high yield and enantioselectivity. The bicyclooctane scaffold of (2R,3R,5R,6R) configuration
Acid-Promoted Iso-Nazarov Cyclization of Conjugated <i>trans</i>-Dienones and Dienals for the Synthesis of 2-Cyclopentenones
作者:Agustina La-Venia、Lucas Passaglia、Lucía Gurgone、Vincent Gandon、Martín J. Riveira
DOI:10.1021/acs.joc.2c01783
日期:2022.10.21
The acid-promoted cyclization of all-trans linearly conjugated dienones and dienals constitutes a synthetic strategy for the construction of 2-cyclopentenones.