Stereoselective synthesis of novel benzoins catalysed by benzaldehyde lyase in a gel-stabilised two-phase system

Research output: Contribution to journalResearch articleContributedpeer-review

Contributors

  • Tanja Hischer - , RWTH Aachen University (First author)
  • Dörte Gocke - , RWTH Aachen University (Author)
  • Maria Fernandez - (Author)
  • Pilar Hoyos - (Author)
  • Andres Alcantara - (Author)
  • Jose Sinisterra - (Author)
  • Winfried Hartmeier - (Author)
  • Marion Bettina Ansorge-Schumacher - , RWTH Aachen University (Author)

Abstract

Asymmetric benzoin condensation was performed using recombinant benzaldehyde lyase (BAL) from Pseudomonas fluorescens Biovar I. To enable the conversion of hydrophobic substrates, the enzyme was entrapped in polyvinyl alcohol and suspended in hexane. Compared to the reported application of the biocatalyst in an aqueous phase containing 20% DMSO, the productivity of the resulting gelstabilised two-phase system was 3-fold better. The entrapment process had an efficiency of O90%, no enzyme or cofactor was lost during reaction or storage. The entrapped enzyme was stable in hexane for 1 week at 4 8C and more than 1 month at K20 8C. Without preceding optimisation the novel benzoins (R)-1,2-di(3-furanyl)-2-hydroxyethanone, (R)-2-hydroxy-1,2-di(3-thienyl) ethanone, (R)-1,2-di(4-ethoxyphenyl)-2-hydroxyethanone, (R)-1,2-di(3-ethoxyphenyl)-2-hydroxyethanone, (R)-2-hydroxy-1,2-di(3-tolyl)ethanone, and (R)-1,2-di(benzofuran-2-yl)-2-hydroxyethanone were prepared with yields up to 31.8% and enantiomeric excess O99%.

Details

Original languageEnglish
Pages (from-to)7378-7383
Number of pages6
JournalTetrahedron
Volume2005
Issue number61
Publication statusPublished - 2005
Peer-reviewedYes
Externally publishedYes

External IDs

Scopus 21744459715
ORCID /0000-0002-2912-546X/work/171551924

Keywords

Keywords

  • Benzoin, Benzaldehydlyase, BAL, Hydrogel, Lösungsmittel, Biokatalyse