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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
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Copper(i)-catalysed asymmetric allylic reductions with hydrosilanes
T N Thanh Nguyen1, Niklas O Thiel, Johannes F Teichert
1Institut für Chemie, Technische Universität Berlin, Strasse des 17. Juni 115, 10623 Berlin, Germany. johannes.teichert@chem.tu-berlin.de.
Chemical Communications (Cambridge, England)
|October 12, 2017
Summary
A new copper(I)-catalyzed asymmetric allylic reduction achieves highly regio- and stereoselective hydride transfer to allylic bromides. This method offers a novel approach to allylic substitution, achieving up to 99% enantioselectivity.", Enhanced_Abstract=default_api.SeocontentEnhancedAbstract(Area_of_Science=[
Area of Science:
- Organic Chemistry
- Catalysis
- Asymmetric Synthesis
Background:
- Allylic substitution reactions are fundamental in organic synthesis.
- Traditional methods often involve carbon nucleophiles, limiting synthetic strategies.
- Developing asymmetric methods for hydride transfer is crucial for chiral molecule synthesis.
Purpose of the Study:
- To develop a novel copper(I)-catalyzed asymmetric allylic reduction.
- To achieve regio- and stereoselective hydride transfer to allylic bromides.
- To establish a conceptually orthogonal approach to allylic substitution.
Main Methods:
- Utilized a copper(I) catalyst coordinated with a chiral N-heterocyclic carbene (NHC) ligand.
- Employed asymmetric allylic reduction of allylic bromides.
- Investigated the reaction mechanism, focusing on SN2' hydride transfer.
Main Results:
- Achieved high regio- and stereoselectivity in the allylic reduction.
- Demonstrated excellent enantioselectivity, reaching up to 99% ee.
- Showcased the catalyst's ability to perform stereoconvergent reactions regardless of substrate double bond configuration.
Conclusions:
- The developed copper(I)-NHC catalyst system enables efficient asymmetric allylic reduction.
- This transformation provides a powerful new method for introducing chirality via hydride nucleophiles.
- The reaction's orthogonality to existing allylic substitution pathways broadens synthetic possibilities.
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