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Development of Heterogeneous Enantioselective Catalysts using Chiral Metal-Organic Frameworks (MOFs)
Published on: January 17, 2020
Catalytic parallel kinetic resolution under homogeneous conditions
Trisha A Duffey1, James A Mackay, Edwin Vedejs
1Department of Chemistry, University of Michigan, Ann Arbor, Michigan 48109, USA.
The Journal of Organic Chemistry
|June 19, 2010
Summary
This study introduces a novel catalytic parallel kinetic resolution (PKR) method using two chiral catalysts to selectively create enantioenriched esters from achiral anhydrides and racemic alcohols.
Area of Science:
- Organic Chemistry
- Catalysis
- Asymmetric Synthesis
Background:
- Kinetic resolution is crucial for obtaining enantiopure compounds.
- Simultaneous activation of multiple acyl donors presents a synthetic challenge.
Purpose of the Study:
- To develop a fully catalytic parallel kinetic resolution (PKR) process.
- To utilize two complementary chiral catalysts for selective anhydride activation.
- To synthesize enantioenriched esters from racemic alcohols.
Main Methods:
- Simultaneous use of phosphine 8d and DMAP-derived ent-23b chiral catalysts.
- Selective activation of two distinct achiral anhydrides as acyl donors.
- Reaction of activated intermediates with racemic benzylic alcohol 5.
Main Results:
- Formation of enantioenriched esters (R)-24 and (S)-17 via PKR.
- Near-ideal enantioselectivity achieved for the aroyl ester (R)-24.
- Minor enantiomeric contamination in ester (S)-17 due to a secondary reaction pathway.
Conclusions:
- The developed PKR method efficiently produces enantioenriched esters.
- Complementary chiral catalysts enable selective activation of multiple acyl donors.
- Understanding side reactions is key to optimizing enantioselectivity in complex catalytic systems.
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