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Modified Julia fluoroolefination: selective preparation of fluoroalkenoates
Emmanuel Pfund1, Cyril Lebargy, Jacques Rouden
1Laboratoire de Chimie Moléculaire et Thio-organique, ENSICAEN, Université de Caen Basse-Normandie, CNRS, 6 boulevard du Maréchal Juin, 14050 Caen, France.
A modified Julia olefination reaction offers a stereoselective synthesis for fluoroalkenoate derivatives. Optimized conditions using DBU and MgBr2 provide efficient access to both (Z)- and (E)-alkenoates.
Area of Science:
- Organic Chemistry
- Synthetic Chemistry
Background:
- The Julia olefination is a valuable method for carbon-carbon bond formation.
- Developing stereoselective routes to fluoroalkenoate derivatives is important for various applications.
Purpose of the Study:
- To apply a modified Julia olefination reaction for the stereoselective synthesis of fluoroalkenoate derivatives.
- To identify efficient base systems for this transformation.
Main Methods:
- Utilized a modified Julia olefination reaction.
- Employed fluorobenzothiazolyl sulfones reacting with aldehydes or ketones.
- Investigated various bases, including DBU and DBU with MgBr2.
Main Results:
- Successfully synthesized fluoroalkenoate derivatives.
- Achieved moderate to excellent stereoselectivity for both (Z)- and (E)-alkenoates.
- DBU and DBU/MgBr2 were identified as the most effective base systems.
Conclusions:
- The modified Julia olefination provides a viable stereoselective route to fluoroalkenoates.
- The choice of base significantly impacts the stereochemical outcome.
- This method offers efficient access to valuable fluoroalkenoate building blocks.
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