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  4. Catalytic Reduction of Oximes to Hydroxylamines: Current Methods, Challenges and Opportunities
 
review article

Catalytic Reduction of Oximes to Hydroxylamines: Current Methods, Challenges and Opportunities

Mas-Rosello, Josep  
•
Cramer, Nicolai  
December 22, 2021
Chemistry-A European Journal

Catalytic reduction of oximes represents a direct efficient approach to synthesize valuable hydroxylamine derivatives. However this transformation presents significant challenges: oximes are hard to reduce and, if reactive, reductive cleavage of the weak N-O bond often leads to primary amine side products. The first suitable systems involved the use of platinum-based heterogeneous catalysts with hydrogen as reductant and stoichiometric amounts of a strong Bronsted acid. More recently metal-free and transition-metal-based homogeneous catalysts have been developed, which display the highest turnovers (up to 4000). In the asymmetric variants, the E/Z-geometry of the oxime double bond affects significantly the stereoselectivity, sometimes requiring extra synthetic efforts in substrate preparation. This minireview provides an overview of the advances and limitations in catalytic oxime to hydroxylamine reduction. Emphasis is put on highlighting and comparing the practical aspects of the existing methods, such as their reaction conditions and substrate scope. Additionally, future directions for improving this young research area are suggested.

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Type
review article
DOI
10.1002/chem.202103683
Web of Science ID

WOS:000732800100001

Author(s)
Mas-Rosello, Josep  
Cramer, Nicolai  
Date Issued

2021-12-22

Publisher

WILEY-V C H VERLAG GMBH

Published in
Chemistry-A European Journal
Article Number

e202103683

Subjects

Chemistry, Multidisciplinary

•

Chemistry

•

catalytic reduction

•

chemoselective

•

hydroxylamine synthesis

•

oxime

•

stereoselective

•

asymmetric hydrogenation

•

ketoxime ethers

•

borane

•

isomerization

•

imines

•

amines

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LCSA  
Available on Infoscience
January 1, 2022
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/184113
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