Deracemizing α‐Branched Carboxylic Acids by Catalytic Asymmetric Protonation of Bis‐Silyl Ketene Acetals with Water or Methanol
作者:Francesca Mandrelli、Aurélie Blond、Thomas James、Hyejin Kim、Benjamin List
DOI:10.1002/anie.201905623
日期:2019.8.12
protonation of bis‐silylketeneacetals. Our method delivers α‐branched carboxylic acids, including nonsteroidal anti‐inflammatory arylpropionic acids such as Ibuprofen, in high enantiomeric purity and high yields. The process can be incorporated in an overall deracemization of α‐branched carboxylic acids, involving a double deprotonation and silylation followed by the catalytic asymmetric protonation.
Arylmalonate decarboxylase (EC. 4. 1. 1. 76) catalysed
decarboxylation followed by enantioface-differentiating protonation of
[α-2H]- and [α-1H]phenylmalonic acid in
1H2O and 2H2O respectively,
gave highly enantiomerically enriched (R)- and
(S)-[α-2H]phenylacetic acid in quantitative
yields.