Biocatalytic deuterium- and hydrogen-transfer using over-expressed ADH-‘A’: enhanced stereoselectivity and<sup>2</sup>H-labeled chiral alcohols
作者:Klaus Edegger、Christian C. Gruber、Tina M. Poessl、Sabine R. Wallner、Iván Lavandera、Kurt Faber、Frank Niehaus、Juergen Eck、Reinhold Oehrlein、Andreas Hafner、Wolfgang Kroutil
DOI:10.1039/b602487d
日期:——
Employing the over-expressed highly organic solvent tolerant alcohol dehydrogenase ADH-âAâ from Rhodococcus ruber DSM 44541, versatile building blocks, which were not accessible by the wild type catalyst, were obtained in > 99% e.e.; furthermore, employing d8-2-propanol as deuterium source, stereoselective biocatalytic deuterium transfer was made feasible to furnish enantiopure deuterium labeled sec-alcohols on a preparative scale employing a single enzyme.
Biocatalytic Cascade for the Synthesis of Enantiopure β-Azidoalcohols and β-Hydroxynitriles
作者:Joerg H. Schrittwieser、Iván Lavandera、Birgit Seisser、Barbara Mautner、Wolfgang Kroutil
DOI:10.1002/ejoc.200900091
日期:2009.5
one-pot reaction sequence starting from prochiral α-chloroketones leading to enantiopure β-azidoalcohols and β-hydroxynitriles is described. Asymmetric bioreduction of α-chloroketones by hydrogen transfer catalysed by an alcohol dehydrogenase (ADH) established the stereogenic centre in the first step to furnish enantiopure chlorohydrin intermediates. Subsequent biocatalysed ring closure to the epoxide
Stereo-Complementary Two-Step Cascades Using a Two-Enzyme System Leading to Enantiopure Epoxides
作者:Birgit Seisser、Iván Lavandera、Kurt Faber、Jeffrey H. Lutje Spelberg、Wolfgang Kroutil
DOI:10.1002/adsc.200700027
日期:2007.6.4
A novel one-pot, two-step, two-enzymecascade is described. Pro-chiral α-chloro ketones are stereoselectively reduced to the corresponding halohydrins as an intermediate by a biocatalytic hydrogen transfer process. The intermediate is transformed to the corresponding epoxide by a non-enantioselective halohydrin dehalogenase. Thus, by combining a Prelog- or anti-Prelog alcohol dehydrogenase with a non-selective
Simultaneous iridium catalysed oxidation and enzymatic reduction employing orthogonal reagents
作者:Francesco G. Mutti、Andreas Orthaber、Joerg H. Schrittwieser、Johannes G. de Vries、Rudolf Pietschnig、Wolfgang Kroutil
DOI:10.1039/c0cc02813d
日期:——
An iridium catalysed oxidation was coupled concurrently to an asymmetric biocatalytic reduction in one-pot; thus it was shown for the first time that iridium- and alcohol dehydrogenase-catalysed redox reactions are compatible. As a model system racemic chlorohydrins were transformed to enantioenriched chlorohydrins via an oxidation-asymmetric reduction sequence.
Shifting the equilibrium of a biocatalytic cascade synthesis to enantiopure epoxides using anion exchangers
作者:Joerg H. Schrittwieser、Iván Lavandera、Birgit Seisser、Barbara Mautner、Jeffrey H. Lutje Spelberg、Wolfgang Kroutil
DOI:10.1016/j.tetasy.2009.02.035
日期:2009.3
successfully employed to shift the equilibrium of a one-pot, two-step, two-enzymecascade reaction affording enantiopureepoxides starting from prochiral α-chloroketones. The α-chloroketones were asymmetrically reduced employing an alcohol dehydrogenase and then transformed further to the corresponding epoxides employing halohydrin dehalogenases. Each epoxide enantiomer could be obtained with up to 93% conversion