Regio- and Stereoselective Reduction of Diketones and Oxidation of Diols by Biocatalytic Hydrogen Transfer
作者:Klaus Edegger、Wolfgang Stampfer、Birgit Seisser、Kurt Faber、Sandra F. Mayer、Reinhold Oehrlein、Andreas Hafner、Wolfgang Kroutil
DOI:10.1002/ejoc.200500839
日期:2006.4
The asymmetric reduction of symmetrical and nonsymmetrical diketones as well as the stereoselectiveoxidation of various diols by biocatalytic hydrogen transfer was investigated by employing lyophilized cells of Rhodococcus ruber DSM 44541 containing alcohol dehydrogense ADH-‘A’. Symmetrical and nonsymmetrical diketones at the (ω-1)- and (ω-2)-positions are reduced to the Prelog product with high stereopreference
A New Route to Protected Acyloins and Their Enzymatic Resolution with Lipases
作者:Günther Scheid、Wouter Kuit、Eelco Ruijter、Romano V. A. Orru、Erik Henke、Uwe Bornscheuer、Ludger A. Wessjohann
DOI:10.1002/ejoc.200300338
日期:2004.3
synthesised by a straight-forward new method through alkylation of tert-butyl 2-acyloxyacetoacetates 3, followed by chemoselective dealkoxy-carbonylation of the tert-butyloxycarbonyl group in the presence of other ester groups. Subsequent hydrolysis of (±)-5 can be achieved with base to give racemic acyloins 6, or with lipase catalysis to afford the corresponding non-racemic acyloins (S)-6. The remaining (R)-acyloin
Engineering transketolase to accept both unnatural donor and acceptor substrates and produce α‐hydroxyketones
作者:Haoran Yu、Roberto Icken Hernández López、David Steadman、Daniel Méndez‐Sánchez、Sally Higson、Armando Cázares‐Körner、Tom D. Sheppard、John M. Ward、Helen C. Hailes、Paul A. Dalby
DOI:10.1111/febs.15108
日期:2020.5
narrow substrate range is a major limitation in exploiting enzymes more widely as catalysts in synthetic organic chemistry. For enzymes using twosubstrates, the simultaneous optimisation of both substratespecificities is also required for the rapid expansion of accepted substrates. Transketolase (TK) catalyses the reversible transfer of a C2 -ketol unit from a donor substrate to an aldehyde acceptor
Chemoenzymatic synthesis of “α-bichiral” synthons. Application to the preparation of chiral epoxides
作者:Pascale Besse、Henri Veschambre
DOI:10.1016/s0957-4166(00)80239-6
日期:1993.6
Microbiological reduction of 3-bromo-2-octanone and 3-azido-2-octanone led to all the stereoisomers of 3-bromo-2-octanol and 3-azido-2-octanol. Chiral 2,3-epoxyoctanes were prepared from the 3-bromo-2-octanols.
Kinetic resolution of vic -diols by Bacillus stearothermophilus diacetyl reductase
The kinetic resolution of several racemic syn-and anti-1,2-diols by enzymatic oxidation with Bacillus stearothermophilus diacetyl reductase is described. The enantiomerically pure (R,R)- and (R,S)-diols are recovered in almost quantitative yield. (C) 1998 Elsevier Science Ltd. All rights reserved.