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  • Title: Potential of some yeast strains in the stereoselective synthesis of (R)-(-)-phenylacetylcarbinol and (S)-(+)-phenylacetylcarbinol and their reduced 1,2-dialcohol derivatives.
    Author: Andreu C, Del Olmo ML.
    Journal: Appl Microbiol Biotechnol; 2014 Jul; 98(13):5901-13. PubMed ID: 24671162.
    Abstract:
    Whole cells of different yeast species have been widely used for a number of asymmetric transformations. In the present study, the screening of several yeast strains revealed the utility of Debaryomyces etchellsii in acyloin condensation for (R)-(-)-phenylacetylcarbinol production. Some conditions for the efficient biotransformation of benzaldehyde and minimization in the production of by-products were explored: pH of the reaction medium, use of additives (ethanol or acetonitrile), temperature, time, and substrate concentration and dosing. The optimal conditions found allowed the transformation of up to 10 g/L of the starting material in reactions carried out at high scale. Furthermore, the yeast Kluyveromyces marxianus was seen to be a convenient biocatalyst to carry out the kinetic resolution by the bioreduction of racemic (+/-)-phenylacetylcarbinol, resulting in (S)-(+)-phenylacetylcarbinol with excellent stereoselectivity. Finally, the ketone reduction of both isolated stereoisomers (R and S) by D. etchellsii allowed the obtainment of two of the four diastereoisomers of 1-phenyl-1,2-propanediol. All these compounds are key precursors for the production of interesting pharmaceutical and chemical products.
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