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
Multicomponent and Metal‐Free Diels–Alder/Aromatization Approach to the Stereospecific Synthesis of <i>E</i>‐(Hetero)Stilbenes and Diarylacetylenes
作者:Marco Ballarotto、Bruno Cerra、Andrea Temperini
DOI:10.1002/ejoc.202300552
日期:2023.9.21
A straightforward, stereospecific and regioselective strategy for the synthesis of substituted E-stilbenes and diarylacetylenes without the use of metal catalysts was developed. DFT calculations were also performed confirming a concerted [4+2] reaction mechanism of the key ring-forming step.