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Issue 85, 2014
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Combined heterogeneous bio- and chemo-catalysis for dynamic kinetic resolution of (rac)-benzoin

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Abstract

Dynamic kinetic resolution (DKR) of racemic starting material is a promising route to optically pure (S)-benzoin (2-hydroxy-1,2-di(phenyl)ethanone) and various symmetrical and unsymmetrical derivatives thereof. Here, this route was advanced towards technical scale synthesis using the basic (rac)-benzoin as model system. The reaction employed stereoselective transesterification of (S)-benzoin with lipase TL® from Pseudomonas stutzeri and racemization of (R)-benzoin with Metal-TUD-1, a metal-associated acidic meso-porous silicate, in pure organic solvent. Enzyme performance was improved by immobilization on Accurel MP1001 (yielding Acc-LipTL), and Zr-TUD-1 (Si/Zr = 25) was identified as most effective racemization catalyst. Compatibility in solvent and temperature dependency enabled performance in only one pot. DKR in toluene at 50 °C yielded conversions above 98% and an ee of >97% in only five hours. Stability of Acc-LipTL was further improved with polyethylene imine and the reaction system was then reused in five cycles, retaining a conversion of >99% and a product-ee of >98%. On a semi-preparative scale, the isolated yield of enantiopure (S)-benzoin butyrate was >98%. Thus, the system provides a good basis for synthesis of enantiopure benzoin, and potentially a broader range of aromatic α-hydroxy ketones.

Graphical abstract: Combined heterogeneous bio- and chemo-catalysis for dynamic kinetic resolution of (rac)-benzoin

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Publication details

The article was received on 07 Jul 2014, accepted on 15 Sep 2014 and first published on 15 Sep 2014


Article type: Paper
DOI: 10.1039/C4RA06751G
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Citation: RSC Adv., 2014,4, 45495-45503
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    Combined heterogeneous bio- and chemo-catalysis for dynamic kinetic resolution of (rac)-benzoin

    R. Nieguth, J. ten Dam, A. Petrenz, A. Ramanathan, U. Hanefeld and M. B. Ansorge-Schumacher, RSC Adv., 2014, 4, 45495
    DOI: 10.1039/C4RA06751G

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