Combining Photo-Organo Redox- and Enzyme Catalysis Facilitates Asymmetric C-H Bond Functionalization

Wuyuan Zhang, Elena Fernández-Fueyo, Frank Hollmann, Laura Leemans Martin, Milja Pesic, Rainer Wardenga, Matthias Höhne, S Schmidt

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Abstract

In this study, we combined photo-organo redox catalysis and biocatalysis to achieve asymmetric C?H bond functionalization of simple alkane starting materials. The photo-organo catalyst anthraquinone sulfate (SAS) was employed to oxyfunctionalise alkanes to aldehydes and ketones. We coupled this light-driven reaction with asymmetric enzymatic functionalisations to yield chiral hydroxynitriles, amines, acyloins and α-chiral ketones with up to 99?% ee. In addition, we demonstrate functional group interconversion to alcohols, esters and carboxylic acids. The transformations can be performed as concurrent tandem reactions. We identified the degradation of substrates and inhibition of the biocatalysts as limiting factors affecting compatibility, due to reactive oxygen species generated in the photocatalytic step. These incompatibilities were addressed by reaction engineering, such as applying a two-phase system or temporal and spatial separation of the catalysts. Using a selection of eleven starting alkanes, one photo-organo catalyst and 8 diverse biocatalysts, we synthesized 26 products and report for the model compounds benzoin and mandelonitrile > 97?% ee at gram scale.
Originalspracheenglisch
Seiten (von - bis)80-84
Seitenumfang5
FachzeitschriftEuropean journal of organic chemistry
Jahrgang2019
Ausgabenummer1
DOIs
PublikationsstatusVeröffentlicht - 10 Jan 2019

Schlagwörter

  • Photocatalysis
  • Chemoenzymatic cascades
  • Photo-organo catalyst
  • Asymmetric synthesis
  • Enzymes

Dies zitieren

Combining Photo-Organo Redox- and Enzyme Catalysis Facilitates Asymmetric C-H Bond Functionalization. / Zhang, Wuyuan; Fernández-Fueyo, Elena; Hollmann, Frank; Leemans Martin, Laura; Pesic, Milja; Wardenga, Rainer; Höhne, Matthias; Schmidt, S.

in: European journal of organic chemistry, Jahrgang 2019, Nr. 1, 10.01.2019, S. 80-84.

Publikation: Beitrag in einer FachzeitschriftArtikelForschungBegutachtung

Zhang, Wuyuan ; Fernández-Fueyo, Elena ; Hollmann, Frank ; Leemans Martin, Laura ; Pesic, Milja ; Wardenga, Rainer ; Höhne, Matthias ; Schmidt, S. / Combining Photo-Organo Redox- and Enzyme Catalysis Facilitates Asymmetric C-H Bond Functionalization. in: European journal of organic chemistry. 2019 ; Jahrgang 2019, Nr. 1. S. 80-84.
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abstract = "In this study, we combined photo-organo redox catalysis and biocatalysis to achieve asymmetric C?H bond functionalization of simple alkane starting materials. The photo-organo catalyst anthraquinone sulfate (SAS) was employed to oxyfunctionalise alkanes to aldehydes and ketones. We coupled this light-driven reaction with asymmetric enzymatic functionalisations to yield chiral hydroxynitriles, amines, acyloins and α-chiral ketones with up to 99?{\%} ee. In addition, we demonstrate functional group interconversion to alcohols, esters and carboxylic acids. The transformations can be performed as concurrent tandem reactions. We identified the degradation of substrates and inhibition of the biocatalysts as limiting factors affecting compatibility, due to reactive oxygen species generated in the photocatalytic step. These incompatibilities were addressed by reaction engineering, such as applying a two-phase system or temporal and spatial separation of the catalysts. Using a selection of eleven starting alkanes, one photo-organo catalyst and 8 diverse biocatalysts, we synthesized 26 products and report for the model compounds benzoin and mandelonitrile > 97?{\%} ee at gram scale.",
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AU - Zhang, Wuyuan

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AU - Hollmann, Frank

AU - Leemans Martin, Laura

AU - Pesic, Milja

AU - Wardenga, Rainer

AU - Höhne, Matthias

AU - Schmidt, S

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