1
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Cananà S, De Nardi F, Blangetti M, Parisotto S, Prandi C. Biocatalysis in Non-Conventional Media: Unlocking the Potential for Sustainable Chiral Amine Synthesis. Chemistry 2024:e202304364. [PMID: 38965045 DOI: 10.1002/chem.202304364] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 07/04/2024] [Accepted: 07/04/2024] [Indexed: 07/06/2024]
Abstract
The application of biocatalysis has become essential in both academic and industrial domains for the asymmetric synthesis of chiral amines, and it serves as an alternative tool to transition-metal catalysis and complements traditional chemical methods. It relies on the swift expansion of available processes, primarily as a result of advanced tools for enzyme discovery, combined with high-throughput laboratory evolution techniques for optimizing biocatalysts. This concept paper explores the utilization of non-conventional media such as ether-type solvents, deep eutectic solvents, and micellar catalysis to enhance biocatalytic reactions for chiral amine synthesis. Each section focuses on the unique properties of these media, including their ability to stabilize enzymes, alter substrate solubility, and modulate enzyme selectivity. The paper aims to provide insights into how these innovative media can overcome traditional limitations, offering new avenues for sustainable and efficient chiral amine production through biocatalytic processes.
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Affiliation(s)
- Stefania Cananà
- Dipartimento di Chimica, Università di Torino, Via Pietro Giuria 7, 10125, Torino, Italy
- Scuola Universitaria Superiore I.U.S.S. Pavia, Piazza Vittoria 15, 27100, Pavia, Italy
| | - Federica De Nardi
- Dipartimento di Chimica, Università di Torino, Via Pietro Giuria 7, 10125, Torino, Italy
| | - Marco Blangetti
- Dipartimento di Chimica, Università di Torino, Via Pietro Giuria 7, 10125, Torino, Italy
| | - Stefano Parisotto
- Dipartimento di Chimica, Università di Torino, Via Pietro Giuria 7, 10125, Torino, Italy
| | - Cristina Prandi
- Dipartimento di Chimica, Università di Torino, Via Pietro Giuria 7, 10125, Torino, Italy
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2
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Zhu J, Yang L, Wu J, Deng Z, Qu X. Engineering Imine Reductase for Efficient Biosynthesis of 1-Aryl-Tetrahydro-β-Carbolines and Their N-Methylation Products. ACS Catal 2022. [DOI: 10.1021/acscatal.1c06012] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Jinmei Zhu
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Lu Yang
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 200240 Shanghai, China
| | - Jiequn Wu
- Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology, Hangzhou 310014, Zhejiang, China
| | - Zixin Deng
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 200240 Shanghai, China
| | - Xudong Qu
- Key Laboratory of Combinatorial Biosynthesis and Drug Discovery Ministry of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
- State Key Laboratory of Microbial Metabolism and School of Life Sciences and Biotechnology, Shanghai Jiao Tong University, 200240 Shanghai, China
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3
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Nastke A, Gröger H. Biocatalytic Synthesis of Heterocycles. HETEROCYCLES 2022. [DOI: 10.1002/9783527832002.ch6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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4
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Aleku GA, Titchiner GR, Roberts GW, Derrington SR, Marshall JR, Hollfelder F, Turner NJ, Leys D. Enzymatic N-Allylation of Primary and Secondary Amines Using Renewable Cinnamic Acids Enabled by Bacterial Reductive Aminases. ACS SUSTAINABLE CHEMISTRY & ENGINEERING 2022; 10:6794-6806. [PMID: 35634269 PMCID: PMC9131517 DOI: 10.1021/acssuschemeng.2c01180] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/27/2022] [Revised: 04/25/2022] [Indexed: 06/15/2023]
Abstract
Allylic amines are a versatile class of synthetic precursors of many valuable nitrogen-containing organic compounds, including pharmaceuticals. Enzymatic allylic amination methods provide a sustainable route to these compounds but are often restricted to allylic primary amines. We report a biocatalytic system for the reductive N-allylation of primary and secondary amines, using biomass-derivable cinnamic acids. The two-step one-pot system comprises an initial carboxylate reduction step catalyzed by a carboxylic acid reductase to generate the corresponding α,β-unsaturated aldehyde in situ. This is followed by reductive amination of the aldehyde catalyzed by a bacterial reductive aminase pIR23 or BacRedAm to yield the corresponding allylic amine. We exploited pIR23, a prototype bacterial reductive aminase, self-sufficient in catalyzing formal reductive amination of α,β-unsaturated aldehydes with various amines, generating a broad range of secondary and tertiary amines accessed in up to 94% conversion under mild reaction conditions. Analysis of products isolated from preparative reactions demonstrated that only selective hydrogenation of the C=N bond had occurred, preserving the adjacent alkene moiety. This process represents an environmentally benign and sustainable approach for the synthesis of secondary and tertiary allylic amine frameworks, using renewable allylating reagents and avoiding harsh reaction conditions. The selectivity of the system ensures that bis-allylation of the alkylamines and (over)reduction of the alkene moiety are avoided.
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Affiliation(s)
- Godwin A. Aleku
- Manchester
Institute of Biotechnology, Department of Chemistry, University of Manchester, Manchester, 131 Princess Street, Manchester M1 7DN, U.K.
- Department
of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA, U.K.
| | - Gabriel R. Titchiner
- Manchester
Institute of Biotechnology, Department of Chemistry, University of Manchester, Manchester, 131 Princess Street, Manchester M1 7DN, U.K.
| | - George W. Roberts
- Manchester
Institute of Biotechnology, Department of Chemistry, University of Manchester, Manchester, 131 Princess Street, Manchester M1 7DN, U.K.
| | - Sasha R. Derrington
- Manchester
Institute of Biotechnology, Department of Chemistry, University of Manchester, Manchester, 131 Princess Street, Manchester M1 7DN, U.K.
| | - James R. Marshall
- Manchester
Institute of Biotechnology, Department of Chemistry, University of Manchester, Manchester, 131 Princess Street, Manchester M1 7DN, U.K.
| | - Florian Hollfelder
- Department
of Biochemistry, University of Cambridge, 80 Tennis Court Road, Cambridge CB2 1GA, U.K.
| | - Nicholas J. Turner
- Manchester
Institute of Biotechnology, Department of Chemistry, University of Manchester, Manchester, 131 Princess Street, Manchester M1 7DN, U.K.
| | - David Leys
- Manchester
Institute of Biotechnology, Department of Chemistry, University of Manchester, Manchester, 131 Princess Street, Manchester M1 7DN, U.K.
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5
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Spöring JD, Graf von Westarp W, Kipp CR, Jupke A, Rother D. Enzymatic Cascade in a Simultaneous, One-Pot Approach with In Situ Product Separation for the Asymmetric Production of (4 S,5 S)-Octanediol. Org Process Res Dev 2022. [DOI: 10.1021/acs.oprd.1c00433] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Jan-Dirk Spöring
- Institute for Bio- and Geosciences 1 (IBG-1), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
- Aachen Biology and Biotechnology (ABBt), RWTH Aachen University, 52074 Aachen, Germany
| | | | - Carina Ronja Kipp
- Institute for Bio- and Geosciences 1 (IBG-1), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
| | - Andreas Jupke
- Fluid Process Engineering (AVT.FVT), RWTH Aachen University, 52074 Aachen, Germany
| | - Dörte Rother
- Institute for Bio- and Geosciences 1 (IBG-1), Forschungszentrum Jülich GmbH, 52428 Jülich, Germany
- Aachen Biology and Biotechnology (ABBt), RWTH Aachen University, 52074 Aachen, Germany
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6
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Jordan A, Hall CGJ, Thorp LR, Sneddon HF. Replacement of Less-Preferred Dipolar Aprotic and Ethereal Solvents in Synthetic Organic Chemistry with More Sustainable Alternatives. Chem Rev 2022; 122:6749-6794. [PMID: 35201751 PMCID: PMC9098182 DOI: 10.1021/acs.chemrev.1c00672] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Dipolar aprotic and ethereal solvents comprise just over 40% of all organic solvents utilized in synthetic organic, medicinal, and process chemistry. Unfortunately, many of the common "go-to" solvents are considered to be "less-preferable" for a number of environmental, health, and safety (EHS) reasons such as toxicity, mutagenicity, carcinogenicity, or for practical handling reasons such as flammability and volatility. Recent legislative changes have initiated the implementation of restrictions on the use of many of the commonly employed dipolar aprotic solvents such as dimethylformamide (DMF) and N-methyl-2-pyrrolidinone (NMP), and for ethers such as 1,4-dioxane. Thus, with growing legislative, EHS, and societal pressures, the need to identify and implement the use of alternative solvents that are greener, safer, and more sustainable has never been greater. Within this review, the ubiquitous nature of dipolar aprotic and ethereal solvents is discussed with respect to the physicochemical properties that have made them so appealing to synthetic chemists. An overview of the current legislative restrictions being imposed on the use of dipolar aprotic and ethereal solvents is discussed. A variety of alternative, safer, and more sustainable solvents that have garnered attention over the past decade are then examined, and case studies and examples where less-preferable solvents have been successfully replaced with a safer and more sustainable alternative are highlighted. Finally, a general overview and guidance for solvent selection and replacement are included in the Supporting Information of this review.
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Affiliation(s)
- Andrew Jordan
- School of Chemistry, University of Nottingham, GlaxoSmithKline Carbon Neutral Laboratory, 6 Triumph Road, Nottingham, NG7 2GA, U.K
| | - Callum G J Hall
- Department of Pure and Applied Chemistry, WestCHEM, University of Strathclyde, Glasgow, Scotland G1 1XL, U.K.,GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Lee R Thorp
- GlaxoSmithKline Medicines Research Centre, Gunnels Wood Road, Stevenage, Hertfordshire SG1 2NY, U.K
| | - Helen F Sneddon
- Green Chemistry Centre of Excellence, University of York, Department of Chemistry, University of York, Heslington, York YO10 5DD, U.K
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8
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Abstract
In this study, we present the synthesis of chiral fragrance aldehydes, which was tackled by a combination of chemo-catalysis and a multi-enzymatic in vivo cascade reaction and the development of a highly versatile high-throughput assay for the enzymatic reduction of carboxylic acids. We investigated a biocompatible metal-catalyzed synthesis for the preparation of α or β substituted cinnamic acid derivatives which were fed directly into the biocatalytic system. Subsequently, the target molecules were synthesized by an enzymatic cascade consisting of a carboxylate reduction, followed by the selective C-C double bond reduction catalyzed by appropriate enoate reductases. We investigated a biocompatible oxidative Heck protocol and combined it with cells expressing a carboxylic acid reductase from Neurospora crassa (NcCAR) and an ene reductase from Saccharomyces pastorianus for the production fragrance aldehydes.
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9
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van Schie MMCH, Spöring JD, Bocola M, Domínguez de María P, Rother D. Applied biocatalysis beyond just buffers - from aqueous to unconventional media. Options and guidelines. GREEN CHEMISTRY : AN INTERNATIONAL JOURNAL AND GREEN CHEMISTRY RESOURCE : GC 2021; 23:3191-3206. [PMID: 34093084 PMCID: PMC8111672 DOI: 10.1039/d1gc00561h] [Citation(s) in RCA: 49] [Impact Index Per Article: 16.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2021] [Accepted: 03/26/2021] [Indexed: 05/09/2023]
Abstract
In nature, enzymes conventionally operate under aqueous conditions. Because of this, aqueous buffers are often the choice for reaction media when enzymes are applied in chemical synthesis. However, to meet the demands of an industrial application, due to the poor water solubility of many industrially relevant compounds, an aqueous reaction system will often not be able to provide sufficient substrate loadings. A switch to a non-aqueous solvent system can provide a solution, which is already common for lipases, but more challenging for biocatalysts from other enzyme classes. The choices in solvent types and systems, however, can be overwhelming. Furthermore, some engineering of the protein structure of biocatalyst formulation is required. In this review, a guide for those working with biocatalysts, who look for a way to increase their reaction productivity, is presented. Examples reported clearly show that bulk water is not necessarily required for biocatalytic reactions and that clever solvent systems design can support increased product concentrations thereby decreasing waste formation. Additionally, under these conditions, enzymes can also be combined in cascades with other, water-sensitive, chemical catalysts. Finally, we show that the application of non-aqueous solvents in biocatalysis can actually lead to more sustainable processes. At the hand of flowcharts, following simple questions, one can quickly find what solvent systems are viable.
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Affiliation(s)
- Morten M C H van Schie
- Institute of Bio- and Geosciences (IBG-1): Biotechnology, Forschungszentrum Jülich GmbH 52425 Jülich Germany
| | - Jan-Dirk Spöring
- Institute of Bio- and Geosciences (IBG-1): Biotechnology, Forschungszentrum Jülich GmbH 52425 Jülich Germany
- Aachen Biology and Biotechnology, RWTH Aachen University 52056 Aachen Germany
| | - Marco Bocola
- Enzymaster Deutschland GmbH Neusser Str. 39 40219 Düsseldorf Germany
| | | | - Dörte Rother
- Institute of Bio- and Geosciences (IBG-1): Biotechnology, Forschungszentrum Jülich GmbH 52425 Jülich Germany
- Aachen Biology and Biotechnology, RWTH Aachen University 52056 Aachen Germany
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10
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Biocatalyzed Redox Processes Employing Green Reaction Media. Molecules 2020; 25:molecules25133016. [PMID: 32630322 PMCID: PMC7411633 DOI: 10.3390/molecules25133016] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 06/27/2020] [Accepted: 06/29/2020] [Indexed: 01/25/2023] Open
Abstract
The application of biocatalysts to perform reductive/oxidative chemical processes has attracted great interest in recent years, due to their environmentally friendly conditions combined with high selectivities. In some circumstances, the aqueous buffer medium normally employed in biocatalytic procedures is not the best option to develop these processes, due to solubility and/or inhibition issues, requiring biocatalyzed redox procedures to circumvent these drawbacks, by developing novel green non-conventional media, including the use of biobased solvents, reactions conducted in neat conditions and the application of neoteric solvents such as deep eutectic solvents.
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11
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Meyer LE, Brundiek H, von Langermann J. Integration of ion exchange resin materials for a downstream-processing approach of an imine reductase-catalyzed reaction. Biotechnol Prog 2020; 36:e3024. [PMID: 32410373 DOI: 10.1002/btpr.3024] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2020] [Revised: 04/21/2020] [Accepted: 05/09/2020] [Indexed: 12/31/2022]
Abstract
In this study, an ion exchange resin-based downstream-processing concept for imine reductase (IRED)-catalyzed reactions was investigated. As a model reaction, 2-methylpyrroline was converted to its corresponding product (S)-2-methylpyrrolidine with >99% of conversion by the (S)-selective IRED from Paenibacillus elgii B69. Under optimized reaction conditions full conversion was achieved using a substrate concentration of 150 and 500 mmol/L of d-glucose. Seven commercially available cation- and anion-exchange resins were studied with respect to their ability to recover the product from the reaction solution. Without any pretreatment, cation-exchange resins Amberlite IR-120(H), IRN-150, Dowex Monosphere 650C, and Dowex Marathon MSC showed high recovery capacities (up to >90%). A 150-ml preparative scale reaction was performed yielding ~1 g hydrochloride salt product with >99% purity. Any further purification steps, for example, by column chromatography or recrystallization, were not required.
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Affiliation(s)
- Lars-Erik Meyer
- Biocatalytic Synthesis Group, Institute of Chemistry, University of Rostock, Rostock, Germany
| | | | - Jan von Langermann
- Biocatalytic Synthesis Group, Institute of Chemistry, University of Rostock, Rostock, Germany
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12
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Sheldon RA, Brady D, Bode ML. The Hitchhiker's guide to biocatalysis: recent advances in the use of enzymes in organic synthesis. Chem Sci 2020; 11:2587-2605. [PMID: 32206264 PMCID: PMC7069372 DOI: 10.1039/c9sc05746c] [Citation(s) in RCA: 142] [Impact Index Per Article: 35.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/12/2019] [Accepted: 02/12/2020] [Indexed: 12/12/2022] Open
Abstract
Enzymes are excellent catalysts that are increasingly being used in industry and academia. This perspective is primarily aimed at synthetic organic chemists with limited experience using enzymes and provides a general and practical guide to enzymes and their synthetic potential, with particular focus on recent applications.
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Affiliation(s)
- Roger A Sheldon
- Molecular Sciences Institute , School of Chemistry , University of the Witwatersrand , Johannesburg , South Africa .
- Department of Biotechnology , Delft University of Technology , Delft , The Netherlands
| | - Dean Brady
- Molecular Sciences Institute , School of Chemistry , University of the Witwatersrand , Johannesburg , South Africa .
| | - Moira L Bode
- Molecular Sciences Institute , School of Chemistry , University of the Witwatersrand , Johannesburg , South Africa .
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13
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Büchsenschütz HC, Vidimce‐Risteski V, Eggbauer B, Schmidt S, Winkler CK, Schrittwieser JH, Kroutil W, Kourist R. Stereoselective Biotransformations of Cyclic Imines in Recombinant Cells of
Synechocystis
sp. PCC 6803. ChemCatChem 2019. [DOI: 10.1002/cctc.201901592] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Hanna C. Büchsenschütz
- Institute of Molecular Biotechnology NAWI Graz, BioTechMedGraz University of Technology Petersgasse 14 Graz 8010 Austria
| | | | - Bettina Eggbauer
- Institute of Molecular Biotechnology NAWI Graz, BioTechMedGraz University of Technology Petersgasse 14 Graz 8010 Austria
| | - Sandy Schmidt
- Institute of Molecular Biotechnology NAWI Graz, BioTechMedGraz University of Technology Petersgasse 14 Graz 8010 Austria
| | - Christoph K. Winkler
- Austrian Centre of Industrial Biotechnology (acib GmbH) Krenngasse 37 Graz 8010 Austria
- Institute of Chemistry, Organic & Bioorganic Chemistry NAWI Graz, BioTechMed GrazUniversity of Graz Heinrichstraße 28/II Graz 8010 Austria
| | - Joerg H. Schrittwieser
- Institute of Chemistry, Organic & Bioorganic Chemistry NAWI Graz, BioTechMed GrazUniversity of Graz Heinrichstraße 28/II Graz 8010 Austria
| | - Wolfgang Kroutil
- Austrian Centre of Industrial Biotechnology (acib GmbH) Krenngasse 37 Graz 8010 Austria
- Institute of Chemistry, Organic & Bioorganic Chemistry NAWI Graz, BioTechMed GrazUniversity of Graz Heinrichstraße 28/II Graz 8010 Austria
| | - Robert Kourist
- Institute of Molecular Biotechnology NAWI Graz, BioTechMedGraz University of Technology Petersgasse 14 Graz 8010 Austria
- Austrian Centre of Industrial Biotechnology (acib GmbH) Krenngasse 37 Graz 8010 Austria
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14
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Biocatalysis as Useful Tool in Asymmetric Synthesis: An Assessment of Recently Granted Patents (2014–2019). Catalysts 2019. [DOI: 10.3390/catal9100802] [Citation(s) in RCA: 57] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023] Open
Abstract
The broad interdisciplinary nature of biocatalysis fosters innovation, as different technical fields are interconnected and synergized. A way to depict that innovation is by conducting a survey on patent activities. This paper analyses the intellectual property activities of the last five years (2014–2019) with a specific focus on biocatalysis applied to asymmetric synthesis. Furthermore, to reflect the inventive and innovative steps, only patents that were granted during that period are considered. Patent searches using several keywords (e.g., enzyme names) have been conducted by using several patent engine servers (e.g., Espacenet, SciFinder, Google Patents), with focus on granted patents during the period 2014–2019. Around 200 granted patents have been identified, covering all enzyme types. The inventive pattern focuses on the protection of novel protein sequences, as well as on new substrates. In some other cases, combined processes, multi-step enzymatic reactions, as well as process conditions are the innovative basis. Both industries and academic groups are active in patenting. As a conclusion of this survey, we can assert that biocatalysis is increasingly recognized as a useful tool for asymmetric synthesis and being considered as an innovative option to build IP and protect synthetic routes.
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15
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Röllig R, Plikat C, Ansorge‐Schumacher MB. Efficient and Selective Carboligation with Whole‐Cell Biocatalysts in Pickering Emulsion. Angew Chem Int Ed Engl 2019; 58:12960-12963. [DOI: 10.1002/anie.201907209] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2019] [Indexed: 11/05/2022]
Affiliation(s)
- Robert Röllig
- Chair of Molecular Biotechnology Technische Universität Dresden 01062 Dresden Germany
| | - Christoph Plikat
- Chair of Molecular Biotechnology Technische Universität Dresden 01062 Dresden Germany
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16
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Röllig R, Plikat C, Ansorge‐Schumacher MB. Efficient and Selective Carboligation with Whole‐Cell Biocatalysts in Pickering Emulsion. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201907209] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Robert Röllig
- Chair of Molecular Biotechnology Technische Universität Dresden 01062 Dresden Germany
| | - Christoph Plikat
- Chair of Molecular Biotechnology Technische Universität Dresden 01062 Dresden Germany
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17
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Sheldon RA, Brady D. Broadening the Scope of Biocatalysis in Sustainable Organic Synthesis. CHEMSUSCHEM 2019; 12:2859-2881. [PMID: 30938093 DOI: 10.1002/cssc.201900351] [Citation(s) in RCA: 155] [Impact Index Per Article: 31.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Revised: 02/05/2019] [Accepted: 03/04/2019] [Indexed: 05/21/2023]
Abstract
This Review is aimed at synthetic organic chemists who may be familiar with organometallic catalysis but have no experience with biocatalysis, and seeks to provide an answer to the perennial question: if it is so attractive, why wasn't it extensively used in the past? The development of biocatalysis in industrial organic synthesis is traced from the middle of the last century. Advances in molecular biology in the last two decades, in particular genome sequencing, gene synthesis and directed evolution of proteins, have enabled remarkable improvements in scope and substantially reduced biocatalyst development times and cost contributions. Additionally, improvements in biocatalyst recovery and reuse have been facilitated by developments in enzyme immobilization technologies. Biocatalysis has become eminently competitive with chemocatalysis and the biocatalytic production of important pharmaceutical intermediates, such as enantiopure alcohols and amines, has become mainstream organic synthesis. The synthetic space of biocatalysis has significantly expanded and is currently being extended even further to include new-to-nature biocatalytic reactions.
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Affiliation(s)
- Roger A Sheldon
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg, 2050, South Africa
- Department of Biotechnology, Delft University of Technology, Section BOC, van der Maasweg 9, 2629 HZ, Delft, The Netherlands
| | - Dean Brady
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, Johannesburg, 2050, South Africa
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18
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Huang L, Aalbers FS, Tang W, Röllig R, Fraaije MW, Kara S. Convergent Cascade Catalyzed by Monooxygenase-Alcohol Dehydrogenase Fusion Applied in Organic Media. Chembiochem 2019; 20:1653-1658. [PMID: 30811825 DOI: 10.1002/cbic.201800814] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2018] [Revised: 02/26/2019] [Indexed: 01/13/2023]
Abstract
With the aim of applying redox-neutral cascade reactions in organic media, fusions of a type II flavin-containing monooxygenase (FMO-E) and horse liver alcohol dehydrogenase (HLADH) were designed. The enzyme orientation and expression vector were found to influence the overall fusion enzyme activity. The resulting bifunctional enzyme retained the catalytic properties of both individual enzymes. The lyophilized cell-free extract containing the bifunctional enzyme was applied for the convergent cascade reaction consisting of cyclobutanone and butane-1,4-diol in different microaqueous media with only 5 % (v/v) aqueous buffer without any addition of external cofactor. Methyl tert-butyl ether and cyclopentyl methyl ether were found to be the best organic media for the synthesis of γ-butyrolactone, resulting in about 27 % analytical yield.
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Affiliation(s)
- Lei Huang
- Department of Engineering, Biocatalysis and Bioprocessing Group, Aarhus University, Gustav Wieds Vej 10, 8000, Aarhus, Denmark.,Institute of Technical Biocatalysis, Hamburg University of Technology, Denickestrasse 15, 21073, Hamburg, Germany
| | - Friso S Aalbers
- Molecular Enzymology Group, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Wei Tang
- Institute of Technical Biocatalysis, Hamburg University of Technology, Denickestrasse 15, 21073, Hamburg, Germany
| | - Robert Röllig
- Institute of Technical Biocatalysis, Hamburg University of Technology, Denickestrasse 15, 21073, Hamburg, Germany.,Chair of Molecular Biotechnology, Technische Universität Dresden, Zellescher Weg 20b, 01062, Dresden, Germany
| | - Marco W Fraaije
- Molecular Enzymology Group, University of Groningen, Nijenborgh 4, 9747 AG, Groningen, The Netherlands
| | - Selin Kara
- Department of Engineering, Biocatalysis and Bioprocessing Group, Aarhus University, Gustav Wieds Vej 10, 8000, Aarhus, Denmark.,Institute of Technical Biocatalysis, Hamburg University of Technology, Denickestrasse 15, 21073, Hamburg, Germany
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19
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de Gonzalo G, Alcántara AR, Domínguez de María P. Cyclopentyl Methyl Ether (CPME): A Versatile Eco-Friendly Solvent for Applications in Biotechnology and Biorefineries. CHEMSUSCHEM 2019; 12:2083-2097. [PMID: 30735610 DOI: 10.1002/cssc.201900079] [Citation(s) in RCA: 59] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2019] [Revised: 02/04/2019] [Indexed: 05/14/2023]
Abstract
The quest for sustainable solvents is currently a matter of intense research and development, as solvents significantly contribute heavily to the waste generated by chemical industries. Cyclopentyl methyl ether (CPME) is a promising eco-friendly solvent with valuable properties such as low peroxide formation rate, stability under basic and acidic conditions, and relatively high boiling point. This Review discusses the potential use of CPME for applications in biotechnology (e.g., biotransformations, as solvent or cosolvent), biorefineries, and bioeconomy (e.g., for furan synthesis or as an extractive agent in liquid-liquid separations), as well as for other purposes, such as chromatography or peptide synthesis. Although CPME is currently produced by petrochemical means with a remarkably high atom economy, its biogenic production can be envisaged from substrates such as cyclopentanol or cyclopentanone, which can be derived from furfural or from (bio-based) adipic acid, respectively. The combination of the promising properties of CPME as a (co)solvent with a future (economic) biogenic origin would be advantageous for setting strategies aligned with the sustainable chemistry principles.
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Affiliation(s)
- Gonzalo de Gonzalo
- Departamento de Química Orgánica, Universidad de Sevilla, c/ Profesor García González 2, 41012, Sevilla, Spain
| | - Andrés R Alcántara
- Department of Chemistry in Pharmaceutical Sciences, Section of Organic and Pharmaceutical Chemistry, Faculty of Pharmacy, Complutense University of Madrid, Plaza de Ramón y Cajal, s/n., E-28040, Madrid, Spain
| | - Pablo Domínguez de María
- Sustainable Momentum, SL, Av. Ansite 3, 4-6, Las Palmas Gran Canaria, E-35011, Canary Islands, Spain
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Zumbrägel N, Gröger H. One-pot synthesis of a 3-thiazolidine through combination of an Asinger-type multi-component-condensation reaction with an enzymatic imine reduction. J Biotechnol 2019; 291:35-40. [DOI: 10.1016/j.jbiotec.2018.12.009] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2018] [Revised: 12/09/2018] [Accepted: 12/14/2018] [Indexed: 10/27/2022]
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Zumbrägel N, Machui P, Nonnhoff J, Gröger H. Enantioselective Biocatalytic Reduction of 2 H-1,4-Benzoxazines Using Imine Reductases. J Org Chem 2019; 84:1440-1447. [PMID: 30562025 DOI: 10.1021/acs.joc.8b02867] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A biocatalytic reduction of 2 H-1,4-benzoxazines using imine reductases is reported. This process enables a smooth and enantioselective synthesis of the resulting cyclic amines under mild conditions in aqueous media by means of a catalytic amount of the cofactor NADPH as hydride source as well as glucose as the reducing agent used in stoichiometric amounts for in situ cofactor recycling. Several substrates were studied, and the 3,4-dihydro-2 H-1,4-benzoxazines were obtained with up to 99% ee. In addition, the efficiency of this reduction process based on imine reductases as catalysts has been demonstrated for one 2 H-1,4-benzoxazine on an elevated laboratory scale running at a substrate loading of 10 g L-1 in the presence of a tailor-made whole-cell catalyst.
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Affiliation(s)
- Nadine Zumbrägel
- Chair of Organic Chemistry I, Faculty of Chemistry , Bielefeld University , Universitätsstraße 25 , 33615 Bielefeld , Germany
| | - Paul Machui
- Chair of Organic Chemistry I, Faculty of Chemistry , Bielefeld University , Universitätsstraße 25 , 33615 Bielefeld , Germany
| | - Jannis Nonnhoff
- Chair of Organic Chemistry I, Faculty of Chemistry , Bielefeld University , Universitätsstraße 25 , 33615 Bielefeld , Germany
| | - Harald Gröger
- Chair of Organic Chemistry I, Faculty of Chemistry , Bielefeld University , Universitätsstraße 25 , 33615 Bielefeld , Germany
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22
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Azzena U, Carraro M, Pisano L, Monticelli S, Bartolotta R, Pace V. Cyclopentyl Methyl Ether: An Elective Ecofriendly Ethereal Solvent in Classical and Modern Organic Chemistry. CHEMSUSCHEM 2019; 12:40-70. [PMID: 30246930 PMCID: PMC6391966 DOI: 10.1002/cssc.201801768] [Citation(s) in RCA: 55] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/01/2018] [Revised: 09/23/2018] [Indexed: 05/07/2023]
Abstract
Solvents represent one of the major contributions to the environmental impact of fine-chemical synthesis. As a result, the use of environmentally friendly solvents in widely employed reactions is a challenge of vast real interest in contemporary organic chemistry. Within this Review, a great variety of examples showing how cyclopentyl methyl ether has been established as particularly useful for this purpose are reported. Indeed, its low toxicity, high boiling point, low melting point, hydrophobicity, chemical stability towards a wide range of conditions, exceptional stability towards the abstraction of hydrogen atoms, relatively low latent heat of vaporization, and the ease with which it can be recovered and recycled enable its successful employment as a solvent in a wide range of synthetic applications, including organometallic chemistry, catalysis, biphasic reactions, oxidations, and radical reactions.
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Affiliation(s)
- Ugo Azzena
- Department of Chemistry and PharmacyUniversity of Sassarivia Vienna 2, I07100SassariItaly
| | - Massimo Carraro
- Department of Chemistry and PharmacyUniversity of Sassarivia Vienna 2, I07100SassariItaly
| | - Luisa Pisano
- Department of Chemistry and PharmacyUniversity of Sassarivia Vienna 2, I07100SassariItaly
| | - Serena Monticelli
- Department of Pharmaceutical ChemistryUniversity of ViennaAlthanstrasse 141090ViennaAustria
| | - Roberta Bartolotta
- Department of Pharmaceutical ChemistryUniversity of ViennaAlthanstrasse 141090ViennaAustria
| | - Vittorio Pace
- Department of Pharmaceutical ChemistryUniversity of ViennaAlthanstrasse 141090ViennaAustria
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Affiliation(s)
- Mahesh D. Patil
- Department of Systems Biotechnology, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea
| | - Gideon Grogan
- Department of Chemistry, University of York, Heslington, York, YO10 5DD, United Kingdom
| | - Andreas Bommarius
- School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 950 Atlantic Drive, Atlanta, Georgia 30332-2000, United States
| | - Hyungdon Yun
- Department of Systems Biotechnology, Konkuk University, 120 Neungdong-ro, Gwangjin-gu, Seoul 05029, Korea
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Velikogne S, Resch V, Dertnig C, Schrittwieser JH, Kroutil W. Sequence-Based In-silico Discovery, Characterisation, and Biocatalytic Application of a Set of Imine Reductases. ChemCatChem 2018; 10:3236-3246. [PMID: 30197686 PMCID: PMC6120462 DOI: 10.1002/cctc.201800607] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2018] [Indexed: 11/17/2022]
Abstract
Imine reductases (IREDs) have recently become a primary focus of research in biocatalysis, complementing other classes of amine-forming enzymes such as transaminases and amine dehydrogenases. Following in the footsteps of other research groups, we have established a set of IRED biocatalysts by sequence-based in silico enzyme discovery. In this study, we present basic characterisation data for these novel IREDs and explore their activity and stereoselectivity using a panel of structurally diverse cyclic imines as substrates. Specific activities of >1 U/mg and excellent stereoselectivities (ee>99 %) were observed in many cases, and the enzymes proved surprisingly tolerant towards elevated substrate loadings. Co-expression of the IREDs with an alcohol dehydrogenase for cofactor regeneration led to whole-cell biocatalysts capable of efficiently reducing imines at 100 mM initial concentration with no need for the addition of extracellular nicotinamide cofactor. Preparative biotransformations on gram scale using these 'designer cells' afforded chiral amines in good yield and excellent optical purity.
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Affiliation(s)
- Stefan Velikogne
- University of GrazInstitute of ChemistryNAWI Graz, BioTechMed GrazHeinrichstrasse 288010GrazAustria
| | - Verena Resch
- University of GrazInstitute of ChemistryNAWI Graz, BioTechMed GrazHeinrichstrasse 288010GrazAustria
| | - Carina Dertnig
- University of GrazInstitute of ChemistryNAWI Graz, BioTechMed GrazHeinrichstrasse 288010GrazAustria
| | - Joerg H. Schrittwieser
- University of GrazInstitute of ChemistryNAWI Graz, BioTechMed GrazHeinrichstrasse 288010GrazAustria
| | - Wolfgang Kroutil
- University of GrazInstitute of ChemistryNAWI Graz, BioTechMed GrazHeinrichstrasse 288010GrazAustria
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Enantioselective reduction of sulfur-containing cyclic imines through biocatalysis. Nat Commun 2018; 9:1949. [PMID: 29769523 PMCID: PMC5955971 DOI: 10.1038/s41467-018-03841-5] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2017] [Accepted: 03/12/2018] [Indexed: 11/21/2022] Open
Abstract
The 3-thiazolidine ring represents an important structural motif in life sciences molecules. However, up to now reduction of 3-thiazolines as an attractive approach failed by means of nearly all chemical reduction technologies for imines. Thus, the development of an efficient general and enantioselective synthetic technology giving access to a range of such heterocycles remained a challenge. Here we present a method enabling the reduction of 3-thiazolines with high conversion and high to excellent enantioselectivity (at least 96% and up to 99% enantiomeric excess). This technology is based on the use of imine reductases as catalysts, has a broad substrate range, and is also applied successfully to other sulfur-containing heterocyclic imines such as 2H-1,4-benzothiazines. Moreover the effiency of this biocatalytic technology platform is demonstrated in an initial process development leading to 99% conversion and 99% enantiomeric excess at a substrate loading of 18 g/L in the presence of designer cells. The 3-thiazolidine ring, a pharmaceutically interesting cyclic structural element found e.g. in some antibiotics, is hard to obtain via currently used approaches. Here, the authors developed a straightforward method to efficiently synthesize a variety of defined, pure 3-thiazolidines.
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Aleku GA, Mangas-Sanchez J, Citoler J, France SP, Montgomery SL, Heath RS, Thompson MP, Turner NJ. Kinetic Resolution and Deracemization of Racemic Amines Using a Reductive Aminase. ChemCatChem 2018. [DOI: 10.1002/cctc.201701484] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Godwin A. Aleku
- School of Chemistry, Manchester Institute of Biotechnology; University of Manchester; 131 Princess Street Manchester M1 7DN UK
| | - Juan Mangas-Sanchez
- School of Chemistry, Manchester Institute of Biotechnology; University of Manchester; 131 Princess Street Manchester M1 7DN UK
| | - Joan Citoler
- School of Chemistry, Manchester Institute of Biotechnology; University of Manchester; 131 Princess Street Manchester M1 7DN UK
| | - Scott P. France
- School of Chemistry, Manchester Institute of Biotechnology; University of Manchester; 131 Princess Street Manchester M1 7DN UK
| | - Sarah L. Montgomery
- School of Chemistry, Manchester Institute of Biotechnology; University of Manchester; 131 Princess Street Manchester M1 7DN UK
| | - Rachel S. Heath
- School of Chemistry, Manchester Institute of Biotechnology; University of Manchester; 131 Princess Street Manchester M1 7DN UK
| | - Matthew P. Thompson
- School of Chemistry, Manchester Institute of Biotechnology; University of Manchester; 131 Princess Street Manchester M1 7DN UK
| | - Nicholas J. Turner
- School of Chemistry, Manchester Institute of Biotechnology; University of Manchester; 131 Princess Street Manchester M1 7DN UK
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27
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Lenz M, Borlinghaus N, Weinmann L, Nestl BM. Recent advances in imine reductase-catalyzed reactions. World J Microbiol Biotechnol 2017; 33:199. [DOI: 10.1007/s11274-017-2365-8] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2017] [Accepted: 10/07/2017] [Indexed: 11/24/2022]
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Zhu J, Tan H, Yang L, Dai Z, Zhu L, Ma H, Deng Z, Tian Z, Qu X. Enantioselective Synthesis of 1-Aryl-Substituted Tetrahydroisoquinolines Employing Imine Reductase. ACS Catal 2017. [DOI: 10.1021/acscatal.7b02628] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Jinmei Zhu
- Key
Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry
of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Hongqun Tan
- Key
Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry
of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Lu Yang
- Key
Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry
of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Zheng Dai
- Key
Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry
of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Lu Zhu
- Key
Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry
of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Hongmin Ma
- Key
Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry
of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Zixin Deng
- Key
Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry
of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
| | - Zhenhua Tian
- Shanghai R&D Center, Abiochem Co., Ltd., 1299 Ziyue Road, Minhang District, Shanghai 200241, China
| | - Xudong Qu
- Key
Laboratory of Combinatorial Biosynthesis and Drug Discovery, Ministry
of Education, School of Pharmaceutical Sciences, Wuhan University, Wuhan 430071, China
- Jiangsu National
Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing 211816, Jiangsu, China
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29
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Reductive amination of ketones catalyzed by whole cell biocatalysts containing imine reductases (IREDs). J Biotechnol 2017; 258:167-170. [DOI: 10.1016/j.jbiotec.2017.05.015] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 05/20/2017] [Accepted: 05/20/2017] [Indexed: 11/19/2022]
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30
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de Souza ROMA, Miranda LSM, Bornscheuer UT. A Retrosynthesis Approach for Biocatalysis in Organic Synthesis. Chemistry 2017; 23:12040-12063. [DOI: 10.1002/chem.201702235] [Citation(s) in RCA: 135] [Impact Index Per Article: 19.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Rodrigo O. M. A. de Souza
- Biocatalysis and Organic Synthesis Group; Federal University of Rio de Janeiro, Chemistry Institute; 21941909 Rio de Janeiro Brazil
| | - Leandro S. M. Miranda
- Biocatalysis and Organic Synthesis Group; Federal University of Rio de Janeiro, Chemistry Institute; 21941909 Rio de Janeiro Brazil
| | - Uwe T. Bornscheuer
- Dept. of Biotechnology & Enzyme Catalysis; Institute of Biochemistry; Greifswald University; Felix-Hausdorff-Str. 4 17487 Greifswald Germany
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31
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Li H, Tian P, Xu JH, Zheng GW. Identification of an Imine Reductase for Asymmetric Reduction of Bulky Dihydroisoquinolines. Org Lett 2017; 19:3151-3154. [DOI: 10.1021/acs.orglett.7b01274] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Hao Li
- State
Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation
Center for Biomanufacturing, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Ping Tian
- Shanghai
Institute of Organic Chemistry, Chinese Academy of Science, 345
Lingling Road, Shanghai 200032, P. R. China
| | - Jian-He Xu
- State
Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation
Center for Biomanufacturing, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
| | - Gao-Wei Zheng
- State
Key Laboratory of Bioreactor Engineering, Shanghai Collaborative Innovation
Center for Biomanufacturing, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, P. R. China
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33
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Hill RA, Sutherland A. Hot off the press. Nat Prod Rep 2016; 33:1352-1356. [DOI: 10.1039/c6np90047j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A personal selection of 32 recent papers is presented covering various aspects of current developments in bioorganic chemistry and novel natural products such as kanamienamide from the marine cyanobacterium Moorea bouillonii.
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