화학공학소재연구정보센터
Journal of the American Chemical Society, Vol.134, No.37, 15233-15236, 2012
Enantioselective Synthesis of alpha-Oxy Amides via Umpolung Amide Synthesis
alpha-Oxy amides are prepared through enantioselective synthesis using a sequence beginning with a Henry addition of bromonitromethane to aldehydes and finishing with Umpolung Amide Synthesis (UmAS). Key to high enantioselection is the finding that ortho-iodo benzoic acid salts of the chiral copper(II) bis(oxazoline) catalyst deliver both diastereomers of the Henry adduct with high enantiomeric excess, homochiral at the oxygen-bearing carbon. Overall, this approach to alpha-oxy amides provides an innovative complement to alternatives that focus almost entirely on the enantioselective synthesis of alpha-oxy carboxylic acids.