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Updated: May 20, 2026

Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
Published on: June 21, 2017
Julia-Kocienski reaction-based 1,3-diene synthesis: aldehyde-dependent (E,E/E,Z)-selectivity
François Billard1, Raphaël Robiette, Jiří Pospíšil
1Institute of Condensed Matter and Nanosciences-Molecules, Solids and Reactivity (IMCN/MOST), Université Catholique de Louvain, Place Louis Pasteur 1, bte L4.01.02, 1348 Louvain-la-Neuve, Belgium.
A modified Julia-Kocienski olefination reaction using cation-specific chelating agents provides predictable (E/Z)-selectivity in 1,3-diene synthesis. Aldehyde structure influences and rationalizes the observed selectivity.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
Background:
- The Julia-Kocienski olefination is a key reaction for forming carbon-carbon double bonds.
- Controlling stereoselectivity in olefination reactions remains a significant challenge in organic synthesis.
Purpose of the Study:
- To develop a novel modification of the Julia-Kocienski olefination.
- To achieve predictable (E/Z)-selectivity in the synthesis of 1,3-dienes.
- To investigate the influence of aldehyde structure on stereochemical outcomes.
Main Methods:
- Utilized cation-specific chelating agents in the Julia-Kocienski olefination.
- Synthesized various 1,3-dienes by modifying aldehyde substrates.
- Analyzed the (E/Z)-selectivity of the newly formed double bond.
Main Results:
- Developed a new Julia-Kocienski olefination protocol.
- Achieved predictable (E/Z)-selectivity in the formation of 1,3-dienes.
- Demonstrated that aldehyde structure significantly impacts the reaction's stereoselectivity.
Conclusions:
- The developed method offers a reliable route to stereodefined 1,3-dienes.
- The findings provide a rational basis for understanding and controlling selectivity in this olefination reaction.
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