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  4. Organocatalytic Enantioselective Acyloin Rearrangement of α-Hydroxy Acetals to α-Alkoxy Ketones
 
research article

Organocatalytic Enantioselective Acyloin Rearrangement of α-Hydroxy Acetals to α-Alkoxy Ketones

Wu, Hua  
•
Wang, Qian  
•
Zhu, Jieping  
2017
Angewandte Chemie International Edition

We report an unprecedented organocatalytic enantioselective acyloin rearrangement of alpha,alpha-disubstituted alpha-hydroxy acetals. In the presence of a catalytic amount of chiral binol-derived N-triflyl phosphoramide, alpha-hydroxy acetals rearranged to alpha-alkoxy ketones in good to high yields with high enantioselectivities. Formation of an ion pair between the in situ generated oxocarbenium ion and the chiral phosphoramide anion was proposed to be responsible for the highly efficient transfer of chirality. Conditions for removal of cyclohexyl and cyclopentyl groups from the corresponding alpha-alkoxy ketones were uncovered underpinning their potential general utility as hydroxy protecting groups. Conversion of the rearranged products to the enantioenriched alpha-hydroxy ketone, 1,2-diol, beta-amino alcohol and 1,4-dioxane was also documented.

  • Details
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Type
research article
DOI
10.1002/anie.201701098
Web of Science ID

WOS:000400755800037

Author(s)
Wu, Hua  
•
Wang, Qian  
•
Zhu, Jieping  
Date Issued

2017

Publisher

Wiley-Blackwell

Published in
Angewandte Chemie International Edition
Volume

56

Issue

21

Start page

5858

End page

5861

Subjects

acyloin rearrangement

•

chiral Brønsted acid

•

ion pair

•

organocatalyst

•

alpha-alkoxy ketone

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
LSPN  
Available on Infoscience
May 12, 2017
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/137343
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