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Facile Preparation of (2Z,4E)-Dienamides by the Olefination of Electron-deficient Alkenes with Allyl Acetate
Published on: June 21, 2017
Efficient synthesis of substituted vinyl ethers using the Julia olefination
Simon Surprenant1, Wing Yan Chan, Carl Berthelette
1Department of Medicinal Chemistry, Merck Frosst Centre for Therapeutic Research, P.O. Box 1005, Pointe-Claire/Dorval, Québec, Canada, H9R 4P8.
This study introduces a new Julia olefination method using alpha-alkoxy sulfones to create vinyl ethers. The reaction is efficient, with yields ranging from 46-90%, and the starting materials are easily prepared.
Area of Science:
- Organic Chemistry
- Synthetic Methodology
Background:
- Vinyl ethers are valuable synthetic intermediates.
- Efficient methods for synthesizing substituted vinyl ethers are in demand.
Purpose of the Study:
- To develop a novel Julia olefination strategy for vinyl ether synthesis.
- To utilize alpha-alkoxy sulfones as key reagents in this transformation.
Main Methods:
- Julia olefination reaction between alpha-alkoxy sulfones (2a-c) and various carbonyl compounds (ketones/aldehydes).
- Two-step preparation of alpha-alkoxy sulfones from commercially available starting materials.
- Optimization of reaction conditions, including base, solvent, and temperature.
Main Results:
- Successful synthesis of substituted vinyl ethers in 46-90% yields.
- Efficient preparation of alpha-alkoxy sulfones (2a-c) in 68-80% yields.
- Identification of base, solvent, and temperature as critical factors for yield.
Conclusions:
- The developed Julia olefination provides a versatile route to substituted vinyl ethers.
- The method offers good yields and utilizes readily accessible starting materials.
- Reaction parameter optimization is key to achieving high efficiency.
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