(R)-2-Tetralol (R)-2a, (R)-5-hydroxy-2-tetralol (R)-2b and (R)-8-hydroxy-2-tetralol (R)-2c, which are key intermediates in the synthesis of pharmacologically active 2-aminotetralins 3, were prepared in moderate to very high enantiomeric excess (up to 99% ee) by enzymatic resolution of the corresponding racemic butyrates rac-1a, rac-1b and rac-1c, respectively, using lipases immobilized on octyl agarose. This methodology is an alternative to the microbial reduction of 2-tetralones. (c) 2009 Elsevier Ltd. All rights reserved.
Tetrahydroxynaphthalene Reductase: Catalytic Properties of an Enzyme Involved in Reductive Asymmetric Naphthol Dearomatization
作者:Michael A. Schätzle、Stephan Flemming、Syed Masood Husain、Michael Richter、Stefan Günther、Michael Müller
DOI:10.1002/anie.201107695
日期:2012.3.12
In reduced circumstances: Tetrahydroxynaphthalenereductase shows a broad substrate range including alternate phenolic compounds and cyclic ketones. Structural modeling reveals major enzyme–substrate interactions; C‐terminal truncation of the enzyme causes an altered substrate preference, in accordance with stabilization of the substrate by the C‐terminal carboxylate (see picture). This effect allows