(<i>S</i>
)-Selectivity in Phenylacetyl Carbinol Synthesis Using the Wild-Type Enzyme Acetoin:Dichlorophenolindophenol Oxidoreductase from <i>Bacillus licheniformis</i>
作者:Pier Paolo Giovannini、Lindomar Alberto Lerin、Michael Müller、Giovanni Bernacchia、Morena De Bastiani、Martina Catani、Graziano Di Carmine、Alessandro Massi
DOI:10.1002/adsc.201600359
日期:2016.9.1
well known biocatalysts for the asymmetric synthesis of α‐hydroxy ketones with preferential (R)‐selectivity. Pharmaceutically relevant phenylacetyl carbinol (PAC) has been prepared with absolute (S)‐configuration only on a few occasions using enzyme variants suitably designed through rational site‐directed mutagenesis approaches. Herein, we describe the synthesis of (S)‐phenylacetyl carbinol products with
Although yeast reduction of α-diketones 1 affords a mixture of two α-hydroxy ketones and a vic-diol, the use of methyl vinyl ketone as an enzyme inhibitor prevents the production of the diol. Regioselectivity in the reduction to afford α-hydroxy ketones is improved by thermal pre-treatment of baker's yeast. Thus, 1-phenyl-2-hydroxy-1-propanone 3a is obtained in 80 % yield with >98% e.e.
Biocatalytic Route to Chiral Acyloins: P450-Catalyzed Regio- and Enantioselective α-Hydroxylation of Ketones
作者:Rubén Agudo、Gheorghe-Doru Roiban、Richard Lonsdale、Adriana Ilie、Manfred T. Reetz
DOI:10.1021/jo502397s
日期:2015.1.16
monooxygenase generated by directed evolution are excellent catalysts for the oxidative α-hydroxylation of ketones with formation of chiral acyloins with high regioselectivity (up to 99%) and enantioselectivity (up to 99% ee). This constitutes a new route to a class of chiral compounds that are useful intermediates in the synthesis of many kinds of biologically active compounds.
Catalytic Scope of the Thiamine-Dependent Multifunctional Enzyme Cyclohexane-1,2-dione Hydrolase
作者:Sabrina Loschonsky、Simon Waltzer、Sonja Fraas、Tobias Wacker、Susana L. A. Andrade、Peter M. H. Kroneck、Michael Müller
DOI:10.1002/cbic.201300673
日期:2014.2.10
cyclohexane‐1,2‐dione hydrolase (CDH) catalyzes the asymmetric cross‐benzoin reaction of aromatic aldehydes and pyruvate (up to quantitative conversion and 92–99 % ee). Notably, CDH accepts several aldehydes, such as hydroxybenzaldehydes, nitrobenzaldehydes, and naphthaldehydes; previously, these have only in rare cases been known as substrates of other thiamine‐dependent enzymes.
Pyruvate decarboxylase: a new enzyme for the production of acyloins by biotransformation
作者:Vladimír Křen、David H. G. Grout、Howard Dalton、David W. Hutchinson、Wilfred König、Margaret M. Turner、Gregory Dean、Nicholas Thomson
DOI:10.1039/c39930000341
日期:——
Highly purified pyruvate decarboxylase from yeast has been shown to catalyse the condensation between pyruvate and a wide range of substituted benzaldehydes to give hydroxyketones (acyloins) of the same (R) enantiomeric series and of high optical purity, as determined by chiral GC using novel cyclodextrin-based stationary phases.