Chiral 2-hydroxypropanone derivatives 5a−v, 8a−d, and 10a, b were formed by benzoylformate decarboxylase (BFD) catalyzed C−C bond formation. A donor aldehyde and acetaldehyde as an acceptor were carboligated in aqueous buffer solution with remarkable ease in high chemical yield and good to high optical purity. The substrate range of this thiamin diphosphate dependent enzyme was examined to employ this
Nucleophilic acylation of esters by acid chlorides mediated by samarium diiodide: Formation and use of samarium enediolates
作者:Fouzia Machrouhi、Jean-Louis Namy、Henri B. Kagan
DOI:10.1016/s0040-4039(97)01727-9
日期:1997.10
Acid chlorides react with esters in the presence of samarium diiodide and catalytic amounts of NiI2 to afford samarium enediolates which can further react with electrophiles such as water or aldehydes to give respectively alpha-ketols or alpha-dihydroxyketones. (C) 1997 Published by Elsevier Science Ltd.
Stereoselektive Synthese von 2-Hydroxyketonen
申请人:Forschungszentrum Jülich GmbH
公开号:EP1048737B1
公开(公告)日:2007-06-06
Selective Synthesis of Unsymmetrical Aliphatic Acyloins through Oxidation of Iridium Enolates
The first method to access unsymmetrical aliphatic acyloins is presented. The method relies on a fast 1,3‐hydride shift mediated by an IrIII complex in allylic alcohols followed by oxidation with TEMPO+. The direct conversion of allylic alcohols into acyloins is achieved in a one‐pot procedure. Further functionalization of the Cα′ of the α‐amino‐oxylated ketone products gives access to highly functionalized