1
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Varandas PAMM, Belinha R, Cobb AJA, Prates Ramalho JP, Segundo MA, Loura LMS, Silva EMP. Flow-based bioconjugation of coumarin phosphatidylethanolamine probes: Optimised synthesis and membrane molecular dynamics studies. BIOCHIMICA ET BIOPHYSICA ACTA. BIOMEMBRANES 2024; 1866:184335. [PMID: 38763271 DOI: 10.1016/j.bbamem.2024.184335] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 04/01/2024] [Accepted: 05/11/2024] [Indexed: 05/21/2024]
Abstract
A series of phosphatidylethanolamine fluorescent probes head-labelled with 3-carboxycoumarin was prepared by an improved bioconjugation approach through continuous flow synthesis. The established procedure, supported by a design of experiment (DoE) set-up, resulted in a significant reduction in the reaction time compared to the conventional batch method, in addition to a minor yield increase. The characterization of these probes was enhanced by an in-depth molecular dynamics (MD) study of the behaviour of a representative probe of this family, 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphoethanolamine labelled with 3-carboxycoumarin (POPE-COUM), in bilayers of 1-palmitoyl-2-oleoyl-sn-glycero-3-phosphocholine (POPC)/1-stearoyl-2-linoleoyl-sn-glycero-3-phosphocholine (SLPC) 2:1, mimicking the composition of the egg yolk lecithin membranes recently used experimentally by our group to study POPE-COUM as a biomarker of the oxidation state and integrity of large unilamellar vesicles (LUVs). The MD simulations revealed that the coumarin group is oriented towards the bilayer interior, leading to a relatively internal location, in agreement with what is observed in the nitrobenzoxadiazole fluorophore of commercial head-labelled NBD-PE probes. This behaviour is consistent with the previously stated hypothesis that POPE-COUM is entirely located within the LUVs structure. Hence, the delay on the oxidation of the probe in the oxygen radical absorbance capacity (ORAC) assays performed is related with the inaccessibility of the probe until alteration of the LUV structure occurs. Furthermore, our simulations show that POPE-COUM exerts very little global and local perturbation on the host bilayer, as evaluated by key properties of the unlabelled lipids. Together, our findings establish PE-COUM as suitable fluorescent lipid analogue probes.
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Affiliation(s)
- Pedro A M M Varandas
- LAQV, REQUIMTE, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, Rua de Jorge Viterbo Ferreira 228, 4050-313 Porto, Portugal
| | - Ricardo Belinha
- LAQV, REQUIMTE, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, Rua de Jorge Viterbo Ferreira 228, 4050-313 Porto, Portugal
| | - Alexander J A Cobb
- Department of Chemistry, King's College London, 7 Trinity Street, London SE1 1DB, United Kingdom
| | - João P Prates Ramalho
- Department of Chemistry, School of Science and Technology, University of Évora, Rua Romão Ramalho 59, 7000-671 Évora, Portugal; LAQV, REQUIMTE, University of Évora, Rua Romão Ramalho 59, 7000-671 Évora, Portugal; Hercules Laboratory, University of Évora, Palácio do Vimioso, Largo Marquês de Marialva 8, 7000-809 Évora, Portugal
| | - Marcela A Segundo
- LAQV, REQUIMTE, Department of Chemical Sciences, Faculty of Pharmacy, University of Porto, Rua de Jorge Viterbo Ferreira 228, 4050-313 Porto, Portugal.
| | - Luís M S Loura
- Faculty of Pharmacy, University of Coimbra, 3000-548 Coimbra, Portugal; Coimbra Chemistry Center - Institute of Molecular Sciences (CQC-IMS), Department of Chemistry, University of Coimbra, 3004-535 Coimbra, Portugal; CNC-Center for Neuroscience and Cell Biology, University of Coimbra, 3004-535 Coimbra, Portugal.
| | - Eduarda M P Silva
- Associate Laboratory i4HB - Institute for Health and Bioeconomy, University Institute of Health Sciences - CESPU, 4585-116 Gandra, Portugal; UCIBIO - Applied Molecular Biosciences Unit, Translational Toxicology Research Laboratory, University Institute of Health Sciences (1H-TOXRUN, IUCS-CESPU), 4585-116 Gandra, Portugal
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2
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To HM, Ollevier T. Cyclopropanation of Alkenes with Halodiazirines as Halocarbene Precursors in Continuous Flow. Chemistry 2024; 30:e202303969. [PMID: 38490952 DOI: 10.1002/chem.202303969] [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: 11/28/2023] [Revised: 03/11/2024] [Accepted: 03/13/2024] [Indexed: 03/17/2024]
Abstract
The cyclopropanation reaction of alkenes with photolytically-generated chlorocarbenes from chlorodiazirines is reported as an effective way to prepare substituted 3-chloro-3-aryl-cyclopropanes. This practical and efficient approach allows the synthesis of various 3-chloro-3-aryl-cyclopropanes (32 examples) in continuous flow in 5-minute residence time under light-emitting diode (LED) irradiation. The conditions using 380 nm LED irradiation were successfully extended to the synthesis of substituted 3-bromo-3-aryl-cyclopropanes (3 examples).
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Affiliation(s)
- Hoang-Minh To
- Département de chimie, Université Laval, 1045 avenue de la Médecine, Québec, QC, G1V 0A6, Canada
| | - Thierry Ollevier
- Département de chimie, Université Laval, 1045 avenue de la Médecine, Québec, QC, G1V 0A6, Canada
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3
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Naik P, García-Lacuna J, O’Neill P, Baumann M. Continuous Flow Oxidation of Alcohols Using TEMPO/NaOCl for the Selective and Scalable Synthesis of Aldehydes. Org Process Res Dev 2024; 28:1587-1596. [PMID: 38783858 PMCID: PMC11110051 DOI: 10.1021/acs.oprd.3c00237] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Indexed: 05/25/2024]
Abstract
A simple and benign continuous flow oxidation protocol for the selective conversion of primary and secondary alcohols into their respective aldehyde and ketone products is reported. This approach makes use of catalytic amounts of TEMPO in combination with sodium bromide and sodium hypochlorite in a biphasic solvent system. A variety of substrates are tolerated including those containing heterocycles based on potentially sensitive nitrogen and sulfur moieties. The flow approach can be coupled with inline reactive extraction by formation of the carbonyl-bisulfite adduct which aids in separation of remaining substrate or other impurities. Process robustness is evaluated for the preparation of phenylpropanal at decagram scale, a trifluoromethylated oxazole building block as well as a late-stage intermediate for the anti-HIV drug maraviroc which demonstrates the potential value of this continuous oxidation method.
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Affiliation(s)
- Parth Naik
- School
of Chemistry, University College Dublin,
Science Centre South, Belfield D04 N2E5, Ireland
| | - Jorge García-Lacuna
- School
of Chemistry, University College Dublin,
Science Centre South, Belfield D04 N2E5, Ireland
| | | | - Marcus Baumann
- School
of Chemistry, University College Dublin,
Science Centre South, Belfield D04 N2E5, Ireland
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4
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Doering M, Trinkies LL, Kieninger J, Kraut M, Rupitsch SJ, Dittmeyer R, Urban GA, Weltin A. In Situ Performance Monitoring of Electrochemical Oxygen and Hydrogen Peroxide Sensors in an Additively Manufactured Modular Microreactor. ACS OMEGA 2024; 9:19700-19711. [PMID: 38708269 PMCID: PMC11064172 DOI: 10.1021/acsomega.4c02210] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/06/2024] [Revised: 03/21/2024] [Accepted: 03/27/2024] [Indexed: 05/07/2024]
Abstract
Miniaturized and microstructured reactors in process engineering are essential for a more decentralized, flexible, sustainable, and resilient chemical production. Modern, additive manufacturing methods for metals enable complex reactor-geometries, increased functionality, and faster design iterations, a clear advantage over classical subtractive machining and polymer-based approaches. Integrated microsensors allow online, in situ process monitoring to optimize processes like the direct synthesis of hydrogen peroxide. We developed a modular tube-in-tube membrane reactor fabricated from stainless steel via 3D printing by laser powder bed fusion of metals (PBF-LB/M). The reactor concept enables the spatially separated dosage and resaturation of two gaseous reactants across a membrane into a liquid process medium. Uniquely, we integrated platinum-based electrochemical sensors for the online detection of analytes to reveal the dynamics inside the reactor. An advanced chronoamperometric protocol combined the simultaneous concentration measurement of hydrogen peroxide and oxygen with monitoring of the sensor performance and self-calibration in long-term use. We demonstrated the highly linear and sensitive monitoring of hydrogen peroxide and dissolved oxygen entering the liquid phase through the membrane. Our measurements delivered important real-time insights into the dynamics of the concentrations in the reactor, highlighting the power of electrochemical sensors applied in process engineering. We demonstrated the stable continuous measurement over 1 week and estimated the sensor lifetime for months in the acidic process medium. Our approach combines electrochemical sensors for process monitoring with advanced, additively manufactured stainless steel membrane microreactors, supporting the power of sensor-equipped microreactors as contributors to the paradigm change in process engineering and toward a greener chemistry.
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Affiliation(s)
- Moritz Doering
- Laboratory
for Sensors, IMTEK − Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany
- Laboratory
for Electrical Instrumentation and Embedded Systems, IMTEK −
Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany
| | - Laura L. Trinkies
- Institute
of Micro Process Engineering (IMVT), Karlsruhe
Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Jochen Kieninger
- Laboratory
for Sensors, IMTEK − Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany
- Laboratory
for Electrical Instrumentation and Embedded Systems, IMTEK −
Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany
| | - Manfred Kraut
- Institute
of Micro Process Engineering (IMVT), Karlsruhe
Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Stefan J. Rupitsch
- Laboratory
for Electrical Instrumentation and Embedded Systems, IMTEK −
Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany
| | - Roland Dittmeyer
- Institute
of Micro Process Engineering (IMVT), Karlsruhe
Institute of Technology, 76344 Eggenstein-Leopoldshafen, Germany
| | - Gerald A. Urban
- Laboratory
for Sensors, IMTEK − Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany
| | - Andreas Weltin
- Laboratory
for Sensors, IMTEK − Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany
- Laboratory
for Electrical Instrumentation and Embedded Systems, IMTEK −
Department of Microsystems Engineering, University of Freiburg, 79110 Freiburg, Germany
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5
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Donnelly K, Baumann M. Advances in the Continuous Flow Synthesis of 3- and 4-Membered Ring Systems. Chemistry 2024:e202400758. [PMID: 38564288 DOI: 10.1002/chem.202400758] [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: 02/23/2024] [Revised: 03/30/2024] [Accepted: 04/02/2024] [Indexed: 04/04/2024]
Abstract
Small carbo- and heterocyclic ring systems have experienced a significant increase in importance in recent years due to their relevance in modern pharmaceuticals, as building blocks for designer materials or as synthetic intermediates. This necessitated the development of new synthetic methods for the preparation of these strained ring systems focusing on effectiveness and scalability. The high ring strain of these entities as well as the use of high-energy reagents and intermediates has often challenged their synthesis. Continuous flow approaches have thus emerged as highly effective means to safely and reliably access these strained scaffolds. In this short review, key developments in this field are summarised showcasing the power of continuous flow approaches for accessing 3- and 4-membered ring systems via thermal, photo- and electrochemical processes.
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Affiliation(s)
- Kian Donnelly
- School of Chemistry, University College Dublin, Science Centre South, Belfield, Dublin 4, Ireland
| | - Marcus Baumann
- School of Chemistry, University College Dublin, Science Centre South, Belfield, Dublin 4, Ireland
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6
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Rodríguez-Álvarez MJ, Ríos-Lombardía N, García-Garrido SE, Concellón C, del Amo V, Capriati V, García-Álvarez J. Recent Advancements in the Utilization of s-Block Organometallic Reagents in Organic Synthesis with Sustainable Solvents. Molecules 2024; 29:1422. [PMID: 38611702 PMCID: PMC11012548 DOI: 10.3390/molecules29071422] [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: 02/15/2024] [Revised: 03/14/2024] [Accepted: 03/19/2024] [Indexed: 04/14/2024] Open
Abstract
This mini-review offers a comprehensive overview of the advancements made over the last three years in utilizing highly polar s-block organometallic reagents (specifically, RLi, RNa and RMgX compounds) in organic synthesis run under bench-type reaction conditions. These conditions involve exposure to air/moisture and are carried out at room temperature, with the use of sustainable solvents as reaction media. In the examples provided, the adoption of Deep Eutectic Solvents (DESs) or even water as non-conventional and protic reaction media has not only replicated the traditional chemistry of these organometallic reagents in conventional and toxic volatile organic compounds under Schlenk-type reaction conditions (typically involving low temperatures of -78 °C to 0 °C and a protective atmosphere of N2 or Ar), but has also resulted in higher conversions and selectivities within remarkably short reaction times (measured in s/min). Furthermore, the application of the aforementioned polar organometallics under bench-type reaction conditions (at room temperature/under air) has been extended to other environmentally responsible reaction media, such as more sustainable ethereal solvents (e.g., CPME or 2-MeTHF). Notably, this innovative approach contributes to enhancing the overall sustainability of s-block-metal-mediated organic processes, thereby aligning with several key principles of Green Chemistry.
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Affiliation(s)
- María Jesús Rodríguez-Álvarez
- Dipartimento di Farmacia—Scienze del Farmaco, Università degli Studi di Bari Aldo Moro, Consorzio Interuniversitario Nazionale “Metodologie e Processi Innovativi di Sintesi” (C.I.N.M.P.I.S.), Via E. Orabona 4, I-70125 Bari, Italy
| | - Nicolás Ríos-Lombardía
- Laboratorio de Química Sintética Sostenible (QuimSinSos), Departamento de Química Orgánica e Inorgánica, Instituto Universitario de Química Organometálica “Enrique Moles” (IUQOEM), Facultad de Química, Universidad de Oviedo, E-33071 Oviedo, Spain
| | - Sergio E. García-Garrido
- Laboratorio de Química Sintética Sostenible (QuimSinSos), Departamento de Química Orgánica e Inorgánica, Instituto Universitario de Química Organometálica “Enrique Moles” (IUQOEM), Facultad de Química, Universidad de Oviedo, E-33071 Oviedo, Spain
| | - Carmen Concellón
- Laboratorio de Química Sintética Sostenible (QuimSinSos), Departamento de Química Orgánica e Inorgánica, Instituto Universitario de Química Organometálica “Enrique Moles” (IUQOEM), Facultad de Química, Universidad de Oviedo, E-33071 Oviedo, Spain
| | - Vicente del Amo
- Laboratorio de Química Sintética Sostenible (QuimSinSos), Departamento de Química Orgánica e Inorgánica, Instituto Universitario de Química Organometálica “Enrique Moles” (IUQOEM), Facultad de Química, Universidad de Oviedo, E-33071 Oviedo, Spain
| | - Vito Capriati
- Dipartimento di Farmacia—Scienze del Farmaco, Università degli Studi di Bari Aldo Moro, Consorzio Interuniversitario Nazionale “Metodologie e Processi Innovativi di Sintesi” (C.I.N.M.P.I.S.), Via E. Orabona 4, I-70125 Bari, Italy
| | - Joaquín García-Álvarez
- Laboratorio de Química Sintética Sostenible (QuimSinSos), Departamento de Química Orgánica e Inorgánica, Instituto Universitario de Química Organometálica “Enrique Moles” (IUQOEM), Facultad de Química, Universidad de Oviedo, E-33071 Oviedo, Spain
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7
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Sulzer N, Polterauer D, Hone CA, Kappe CO. Preparation of Sulfonyl Chlorides by Oxidative Chlorination of Thiols and Disulfides using HNO 3/HCl/O 2 in a Flow Reactor. CHEMSUSCHEM 2024:e202400292. [PMID: 38477977 DOI: 10.1002/cssc.202400292] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2024] [Revised: 03/07/2024] [Accepted: 03/08/2024] [Indexed: 03/14/2024]
Abstract
A continuous flow metal-free protocol for the synthesis of sulfonyl chlorides from thiols and disulfides in the presence of nitric acid, hydrochloric acid and oxygen was developed. The influence of the reaction parameters was investigated under batch and flow conditions. Online 19F NMR was successfully implemented to investigate different reaction conditions within a single experiment. The sulfonyl chlorides were isolated (mostly in 70-81 % yield) after performing a simple aqueous washing procedure. In particular, the protocol was successfully operated for >6 hours to convert diphenyl disulfide to its corresponding sulfonyl chloride, achieving a throughput of 3.7 g h-1. The environmental impact of the protocol was assessed and compared to an existing continuous flow protocol using 1,3-dichloro-5,5-dimethylhydantoin (DCH) as reagent. The process mass intensity (PMI) for the newly-developed flow protocol (15) compared favorably to the DCH flow process (20).
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Affiliation(s)
- Niklas Sulzer
- Center for Continuous Flow Synthesis and Processing (CCLOW), Research Center Pharmaceutical Engineering GmbH (RCPE), Inffeldgasse 13, 8010, Graz, Austria
- Institute of Chemistry, University of Graz, Heinrichstrasse 28, 8010, Graz, Austria
| | - Dominik Polterauer
- Center for Continuous Flow Synthesis and Processing (CCLOW), Research Center Pharmaceutical Engineering GmbH (RCPE), Inffeldgasse 13, 8010, Graz, Austria
- Institute of Chemistry, University of Graz, Heinrichstrasse 28, 8010, Graz, Austria
| | - Christopher A Hone
- Center for Continuous Flow Synthesis and Processing (CCLOW), Research Center Pharmaceutical Engineering GmbH (RCPE), Inffeldgasse 13, 8010, Graz, Austria
- Institute of Chemistry, University of Graz, Heinrichstrasse 28, 8010, Graz, Austria
| | - C Oliver Kappe
- Center for Continuous Flow Synthesis and Processing (CCLOW), Research Center Pharmaceutical Engineering GmbH (RCPE), Inffeldgasse 13, 8010, Graz, Austria
- Institute of Chemistry, University of Graz, Heinrichstrasse 28, 8010, Graz, Austria
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8
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Laporte AAH, Masson TM, Zondag SDA, Noël T. Multiphasic Continuous-Flow Reactors for Handling Gaseous Reagents in Organic Synthesis: Enhancing Efficiency and Safety in Chemical Processes. Angew Chem Int Ed Engl 2024; 63:e202316108. [PMID: 38095968 DOI: 10.1002/anie.202316108] [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: 10/24/2023] [Indexed: 12/29/2023]
Abstract
The use of reactive gaseous reagents for the production of active pharmaceutical ingredients (APIs) remains a scientific challenge due to safety and efficiency limitations. The implementation of continuous-flow reactors has resulted in rapid development of gas-handling technology because of several advantages such as increased interfacial area, improved mass- and heat transfer, and seamless scale-up. This technology enables shorter and more atom-economic synthesis routes for the production of pharmaceutical compounds. Herein, we provide an overview of literature from 2016 onwards in the development of gas-handling continuous-flow technology as well as the use of gases in functionalization of APIs.
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Affiliation(s)
- Annechien A H Laporte
- Flow Chemistry Group, van't Hoff Institute for Molecular Sciences (HIMS), Universiteit van Amsterdam (UvA), Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Tom M Masson
- Flow Chemistry Group, van't Hoff Institute for Molecular Sciences (HIMS), Universiteit van Amsterdam (UvA), Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Stefan D A Zondag
- Flow Chemistry Group, van't Hoff Institute for Molecular Sciences (HIMS), Universiteit van Amsterdam (UvA), Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Timothy Noël
- Flow Chemistry Group, van't Hoff Institute for Molecular Sciences (HIMS), Universiteit van Amsterdam (UvA), Science Park 904, 1098 XH, Amsterdam, The Netherlands
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9
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Schuurmans JHA, Masson TM, Zondag SDA, Buskens P, Noël T. Solar-Driven Continuous CO 2 Reduction to CO and CH 4 using Heterogeneous Photothermal Catalysts: Recent Progress and Remaining Challenges. CHEMSUSCHEM 2024; 17:e202301405. [PMID: 38033222 DOI: 10.1002/cssc.202301405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/29/2023] [Revised: 11/29/2023] [Accepted: 11/30/2023] [Indexed: 12/02/2023]
Abstract
The urgent need to reduce the carbon dioxide level in the atmosphere and keep the effects of climate change manageable has brought the concept of carbon capture and utilization to the forefront of scientific research. Amongst the promising pathways for this conversion, sunlight-powered photothermal processes, synergistically using both thermal and non-thermal effects of light, have gained significant attention. Research in this field focuses both on the development of catalysts and continuous-flow photoreactors, which offer significant advantages over batch reactors, particularly for scale-up. Here, we focus on sunlight-driven photothermal conversion of CO2 to chemical feedstock CO and CH4 as synthetic fuel. This review provides an overview of the recent progress in the development of photothermal catalysts and continuous-flow photoreactors and outlines the remaining challenges in these areas. Furthermore, it provides insight in additional components required to complete photothermal reaction systems for continuous production (e. g., solar concentrators, sensors and artificial light sources). In addition, our review emphasizes the necessity of integrated collaboration between different research areas, like chemistry, material science, chemical engineering, and optics, to establish optimized systems and reach the full potential of this technology.
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Affiliation(s)
- Jasper H A Schuurmans
- Flow Chemistry Group, Van't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Tom M Masson
- Flow Chemistry Group, Van't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Stefan D A Zondag
- Flow Chemistry Group, Van't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
| | - Pascal Buskens
- The Netherlands Organization for Applied Scientific Research (TNO), High Tech Campus 25, 5656 AE, Eindhoven, The Netherlands
- Design and Synthesis of Inorganic Materials (DESINe), Institute for Materials Research, Hasselt University, Agoralaan Building D, 3590, Diepenbeek, Belgium
| | - Timothy Noël
- Flow Chemistry Group, Van't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands
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10
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Shan C, Li R, Wang X. Efficient construction of a β-naphthol library under continuous flow conditions. RSC Adv 2024; 14:2673-2677. [PMID: 38226147 PMCID: PMC10789443 DOI: 10.1039/d3ra08660g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2023] [Accepted: 01/04/2024] [Indexed: 01/17/2024] Open
Abstract
A β-naphthol library has been efficiently constructed utilizing a mild continuous flow procedure, relying on a tandem Friedel-Crafts reaction and starting from readily available arylacetyl chloride and alkynes. Multiple functionalized β-naphthols can be acquired within 160 s in generally high yields (up to 83%). Using an electron-rich phenylacetyl chloride derivative (4-OH- or 4-MeO-) provides spirofused triene dione as the primary product. A scale-up preparation affords a throughput of 4.70 g h-1, indicating potential large-scale application. Herein, we present a rapid, reliable, and scalable method to obtain various β-naphthols in the compound library.
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Affiliation(s)
- Chao Shan
- Heze University Heze Shandong Province 274015 China
| | - Ranran Li
- Heze University Heze Shandong Province 274015 China
| | - Xinchao Wang
- Heze University Heze Shandong Province 274015 China
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11
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García-Lacuna J, Baumann M. Continuous Flow Synthesis of Nitrosoarenes via Photochemical Rearrangement of Aryl Imines. J Org Chem 2024; 89:617-623. [PMID: 38131303 PMCID: PMC10777388 DOI: 10.1021/acs.joc.3c02362] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/16/2023] [Revised: 11/20/2023] [Accepted: 12/06/2023] [Indexed: 12/23/2023]
Abstract
Nitrosoarenes are versatile organic building blocks; however, their intrinsic instability and limited synthetic accessibility have so far restricted their widespread use. Herein, we present a new continuous flow route toward these entities that is based on a direct photochemical rearrangement process using o-nitrophenylimines as starting materials. Due to the underlying redox mechanism, a new amide group accompanies the formation of the nitroso group. Crucial to the success of this approach is the use of trifluoroethanol as a solvent and high-power light-emitting diodes (365 nm) as light sources that provide uniform irradiation and high efficiency of the resulting continuous flow method. The process is fast and robust, with high functional group tolerance and high throughput. The formation of the nitroso moiety is supported by full spectroscopic analysis, including X-ray crystallography. The scalability of this flow approach allows access to gram quantities of nitroso species for which we highlight a small set of derivatization reactions underlining their synthetic utility.
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Affiliation(s)
- Jorge García-Lacuna
- University College Dublin, School of Chemistry, Science Centre South, Belfield, Dublin 4, Ireland
| | - Marcus Baumann
- University College Dublin, School of Chemistry, Science Centre South, Belfield, Dublin 4, Ireland
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12
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Mittal AK, Pathak P, Prakash G, Maiti D. Highly Scalable and Inherently Safer Preparation of Di, Tri and Tetra Nitrate Esters Using Continuous Flow Chemistry. Chemistry 2023; 29:e202301662. [PMID: 37505482 DOI: 10.1002/chem.202301662] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/25/2023] [Revised: 07/24/2023] [Accepted: 07/28/2023] [Indexed: 07/29/2023]
Abstract
Nitrate esters are important organic compounds having wide application in energetic materials, medicines and fuel additives. They are synthesized through nitration of aliphatic polyols. But the process safety challenges associated with nitration reaction makes the production process complicated and economically unviable. Herein, we have developed a continuous flow process wherein polyol and nitric acid are reacted in a microreactor to produce nitrate ester continuously. Our developed process is inherently safer and efficient. The process was optimized for industrially important nitrate esters containing two, three and four nitro groups. Substrates include glycol dinitrates: 1,2-propylene glycol dinitrate (PGDN), ethylene glycol dinitrate (EGDN), diethylene glycol dinitrate (DEGDN), triethylene glycol dinitrate (TEGDN); trinitrates: trimethylolethane trinitrate (TMETN), 1,2,4-butanetriol trinitrate (BTTN); and tetranitrates: erythritol tetranitrate (ETN). The optimized process for each molecule provided yield >90 % in a short residence time of 1 min corresponding to a space time yield of >18 g/h/mL of reactor volume.
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Affiliation(s)
- Ankit Kumar Mittal
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai, 400076, India
| | - Pramod Pathak
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai, 400076, India
| | - Gaurav Prakash
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai, 400076, India
| | - Debabrata Maiti
- Department of Chemistry, Indian Institute of Technology Bombay Powai, Mumbai, 400076, India
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13
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Chai K, Yang X, Shen R, Chen J, Su W, Su A. A high activity mesoporous Pt@KIT-6 nanocomposite for selective hydrogenation of halogenated nitroarenes in a continuous-flow microreactor. NANOSCALE ADVANCES 2023; 5:5649-5660. [PMID: 37822898 PMCID: PMC10563833 DOI: 10.1039/d3na00437f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/21/2023] [Accepted: 09/13/2023] [Indexed: 10/13/2023]
Abstract
In this study, we designed a Pt@KIT-6 nanocomposite prepared by impregnating platinum nanoparticles on the nanopores of the KIT-6 mesoporous material. This Pt@KIT-6 nanocomposite was used as a catalyst in a micro fixed bed reactor (MFBR) for the continuous-flow hydrogenation of halogenated nitroarenes, which demonstrates three advantages. First, the Pt@KIT-6 nanocomposite has a stable mesoporous nanostructure, which effectively enhances the active site and hydrogen adsorption capacity. The uniformly distributed pore structure and large specific surface area were confirmed by electron microscopy and N2 physisorption, respectively. In addition, the aggregation of the loaded metal was avoided, which facilitated the maintenance of high activity and selectivity. The conversion and selectivity reached 99% within 5.0 minutes at room temperature (20 °C). Furthermore, the continuous-flow microreactor allows precise control and timely transfer of the reaction system, reducing the impact of haloid acids. The activity and selectivity of the Pt@KIT-6 nanocomposite showed virtually no degradation after 24 hours of continuous operation of the entire continuous-flow system. Overall, the Pt@KIT-6 nanocomposite showed good catalysis for the hydrogenation of halogenated nitroarenes in the continuous-flow microreactor. This work provides insights into the rational design of a highly active and selective catalyst for selective hydrogenation systems.
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Affiliation(s)
- Kejie Chai
- Key Laboratory of Pharmaceutical Engineering of Zhejiang Province, National Engineering Research Center for Process Development of Active Pharmaceutical Ingredients, Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology Hangzhou 310014 P. R. China
| | - Xilin Yang
- Key Laboratory of Pharmaceutical Engineering of Zhejiang Province, National Engineering Research Center for Process Development of Active Pharmaceutical Ingredients, Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology Hangzhou 310014 P. R. China
| | - Runqiu Shen
- Key Laboratory of Pharmaceutical Engineering of Zhejiang Province, National Engineering Research Center for Process Development of Active Pharmaceutical Ingredients, Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology Hangzhou 310014 P. R. China
| | - Jianli Chen
- Key Laboratory of Pharmaceutical Engineering of Zhejiang Province, National Engineering Research Center for Process Development of Active Pharmaceutical Ingredients, Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology Hangzhou 310014 P. R. China
- College of New Materials Engineering, Jiaxing Nanhu University Jiaxing 314000 P. R. China
| | - Weike Su
- Key Laboratory of Pharmaceutical Engineering of Zhejiang Province, National Engineering Research Center for Process Development of Active Pharmaceutical Ingredients, Collaborative Innovation Center of Yangtze River Delta Region Green Pharmaceuticals, Zhejiang University of Technology Hangzhou 310014 P. R. China
| | - An Su
- College of Chemical Engineering, Zhejiang University of Technology Hangzhou 310014 P. R. China
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14
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Bayrakdar TACA, Lescot C. Process Development of Heterogeneous Rh Catalyzed Carbene Transfer Reactions Under Continuous Flow Conditions. CHEMSUSCHEM 2023; 16:e202300596. [PMID: 37184307 DOI: 10.1002/cssc.202300596] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/27/2023] [Revised: 05/15/2023] [Accepted: 05/15/2023] [Indexed: 05/16/2023]
Abstract
A very simple Rh-based catalyst operates under heterogeneous flow conditions for the carbene transfer of methyl diazoacetate (MDA) with several substrates. Two different methods for heterogenizing the catalyst in a column reactor have been applied. Different X-H (X=O, S, Si, CH2 ) were successfully functionalized by the carbene and cyclopropenation was performed under very mild continuous flow conditions. Following these promising results, catalyst recycling experiments using both methodologies were conducted in which up to 5 catalytic cycles have been achieved for the carbene O-H insertion reaction and interestingly, a sequential transformation of different substrates with up to 10 consecutive runs per reactor were achieved with no loss in the catalytic activity, thus allowing the production of families of compounds.
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Affiliation(s)
- Tahani A C A Bayrakdar
- Chimie ParisTech PSL, CNRS 8060, Institute of Chemistry for Life and Health Sciences (i-CLeHS), 11, rue Pierre et Marie Curie, 75005, Paris, France
| | - Camille Lescot
- Chimie ParisTech PSL, CNRS 8060, Institute of Chemistry for Life and Health Sciences (i-CLeHS), 11, rue Pierre et Marie Curie, 75005, Paris, France
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15
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Sumii Y, Shibata N. Current State of Microflow Trifluoromethylation Reactions. CHEM REC 2023; 23:e202300117. [PMID: 37309300 DOI: 10.1002/tcr.202300117] [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: 04/03/2023] [Revised: 05/25/2023] [Indexed: 06/14/2023]
Abstract
The trifluoromethyl group is a powerful structural motif in drugs and polymers; thus, developing trifluoromethylation reactions is an important area of research in organic chemistry. Over the past few decades, significant progress has been made in developing new methods for the trifluoromethylation of organic molecules, ranging from nucleophilic and electrophilic approaches to transition-metal catalysis, photocatalysis, and electrolytic reactions. While these reactions were initially developed in batch systems, more recent microflow versions are highly attractive for industrial applications owing to their scalability, safety, and time efficiency. In this review, we discuss the current state of microflow trifluoromethylation. Approaches for microflow trifluoromethylation based on different trifluoromethylation reagents are described, including continuous flow, flow photochemical, microfluidic electrochemical reactions, and large-scale microflow reactions.
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Affiliation(s)
- Yuji Sumii
- Department of Engineering, Nagoya Institute of Technology, Gokiso, Showa-Ku, Nagoya, 466-8555, Japan
| | - Norio Shibata
- Department of Engineering, Nagoya Institute of Technology, Gokiso, Showa-Ku, Nagoya, 466-8555, Japan
- Department of Nanopharmaceutical Sciences, Department of Engineering, Nagoya Institute of Technology, Gokiso, Showa-Ku, Nagoya, 466-8555, Japan
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16
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Faye Y, Rkein B, Bigot A, Lequeux T, Legros J, Chataigner I. Photocatalyzed (3+2) Cycloaddition for the Dearomatization of Electron-Poor Arenes under Flow Conditions. Chemistry 2023; 29:e202301567. [PMID: 37306243 DOI: 10.1002/chem.202301567] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2023] [Revised: 06/12/2023] [Accepted: 06/12/2023] [Indexed: 06/13/2023]
Abstract
The photocatalyzed dearomative reaction between various electron-deficient aromatic compounds and a non-stabilized azomethine ylide is successfully performed in a flow system. Whereas the use of supported eosin as organic photocatalyst exhibits limited efficiency, turning to the soluble Rose Bengal allows to transform a broad range of substrates from hetarenes (indole, benzofuran, quinoline, pyridine) to naphthalenes and benzenes. This photocatalyzed (3+2) dearomative cycloaddition under green light irradiation provides a simple and efficient access to tridimensional pyrrolidino scaffolds with a tetrasubstituted carbon center at ring junction and can be performed in the friendly ethyl acetate. Computational studies support the mechanism involving azomethine ylide as reactive species toward the electron-poor arene.
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Affiliation(s)
- Youssou Faye
- Univ Rouen Normandie, INSA Rouen Normandie, CNRS, Normandie Univ, COBRA, 76000, Rouen, France
| | - Batoul Rkein
- Univ Rouen Normandie, INSA Rouen Normandie, CNRS, Normandie Univ, COBRA, 76000, Rouen, France
| | - Antoine Bigot
- Univ Rouen Normandie, INSA Rouen Normandie, CNRS, Normandie Univ, COBRA, 76000, Rouen, France
| | - Thierry Lequeux
- Normandie Univ., ENSICAEN, Unicaen, CNRS, LCMT, 14000, Caen, France
| | - Julien Legros
- Univ Rouen Normandie, INSA Rouen Normandie, CNRS, Normandie Univ, COBRA, 76000, Rouen, France
| | - Isabelle Chataigner
- Univ Rouen Normandie, INSA Rouen Normandie, CNRS, Normandie Univ, COBRA, 76000, Rouen, France
- Sorbonne Université, CNRS, Laboratoire de Chimie Théorique, LCT UMR7616, 75005, Paris, France
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17
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Usman M, Rehman A, Saleem F, Abbas A, Eze VC, Harvey A. Synthesis of cyclic carbonates from CO 2 cycloaddition to bio-based epoxides and glycerol: an overview of recent development. RSC Adv 2023; 13:22717-22743. [PMID: 37502825 PMCID: PMC10370462 DOI: 10.1039/d3ra03028h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2023] [Accepted: 07/04/2023] [Indexed: 07/29/2023] Open
Abstract
Anthropogenic carbon dioxide (CO2) emissions contribute significantly to global warming and deplete fossil carbon resources, prompting a shift to bio-based raw materials. The two main technologies for reducing CO2 emissions are capturing and either storing or utilizing it. However, while capture and storage have high reduction potential, they lack economic feasibility. Conversely, by utilizing the CO2 captured from streams and air to produce valuable products, it can become an asset and curb greenhouse gas effects. CO2 is a challenging C1-building block due to its high kinetic inertness and thermodynamic stability, requiring high temperature and pressure conditions and a reactive catalytic system. Nonetheless, cyclic carbonate production by reacting epoxides and CO2 is a promising green and sustainable chemistry reaction, with enormous potential applications as an electrolyte in lithium-ion batteries, a green solvent, and a monomer in polycarbonate production. This review focuses on the most recent developments in the synthesis of cyclic carbonates from glycerol and bio-based epoxides, as well as efficient methods for chemically transforming CO2 using flow chemistry and novel reactor designs.
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Affiliation(s)
- Muhammad Usman
- Department of Chemical and Polymer Engineering, University of Engineering and Technology Lahore, Faisalabad Campus Pakistan
- School of Engineering, Newcastle University Newcastle Upon Tyne NE1 7RU UK
| | - Abdul Rehman
- Department of Chemical and Polymer Engineering, University of Engineering and Technology Lahore, Faisalabad Campus Pakistan
- School of Engineering, Newcastle University Newcastle Upon Tyne NE1 7RU UK
| | - Faisal Saleem
- Department of Chemical and Polymer Engineering, University of Engineering and Technology Lahore, Faisalabad Campus Pakistan
- School of Engineering, Newcastle University Newcastle Upon Tyne NE1 7RU UK
| | - Aumber Abbas
- Songshan Lake Materials Laboratory, University Innovation Park Dongguan 523808 China
| | - Valentine C Eze
- School of Engineering, Newcastle University Newcastle Upon Tyne NE1 7RU UK
| | - Adam Harvey
- School of Engineering, Newcastle University Newcastle Upon Tyne NE1 7RU UK
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18
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O'Callaghan KS, Lynch D, Baumann M, Collins SG, Maguire AR. Flow photolysis of aryldiazoacetates leading to dihydrobenzofurans via intramolecular C-H insertion. Org Biomol Chem 2023. [PMID: 37248769 DOI: 10.1039/d3ob00541k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
Flow photolysis of aryldiazoacetates 3-5 leads to C-H insertion to form dihydrobenzofurans 6-8 in a metal-free process, using either a medium pressure mercury lamp (250-390 nm) or LEDs (365 nm or 450 nm) with comparable synthetic outcomes. Significantly, addition of 4,4'-dimethoxybenzophenone 9 results in an increased yield and also alters the stereochemical outcome leading to preferential isolation of the trans dihydrobenzofurans 6a-8a (up to 50% yield), while the cis and trans diastereomers of 6-8 are recovered in essentially equimolar amounts in the absence of a photosensitiser (up to 26% yield).
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Affiliation(s)
- Katie S O'Callaghan
- School of Chemistry, Analytical and Biological Chemistry Research Facility, Synthesis and Solid State Pharmaceutical Centre, University College Cork, Ireland.
| | - Denis Lynch
- School of Chemistry, Analytical and Biological Chemistry Research Facility, Synthesis and Solid State Pharmaceutical Centre, University College Cork, Ireland.
| | - Marcus Baumann
- School of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
| | - Stuart G Collins
- School of Chemistry, Analytical and Biological Chemistry Research Facility, Synthesis and Solid State Pharmaceutical Centre, University College Cork, Ireland.
| | - Anita R Maguire
- School of Chemistry, Analytical and Biological Chemistry Research Facility, Synthesis and Solid State Pharmaceutical Centre, University College Cork, Ireland.
- School of Pharmacy, University College Cork, Ireland
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19
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Tomasi Masoni S, Mariotti A, Antognoli M, Galletti C, Mauri R, Salvetti M, Brunazzi E. Reaction performance in T-, X- and arrow-shaped microdevices. Chem Eng Res Des 2023. [DOI: 10.1016/j.cherd.2023.03.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/04/2023]
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20
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Capaldo L, Wen Z, Noël T. A field guide to flow chemistry for synthetic organic chemists. Chem Sci 2023; 14:4230-4247. [PMID: 37123197 PMCID: PMC10132167 DOI: 10.1039/d3sc00992k] [Citation(s) in RCA: 32] [Impact Index Per Article: 32.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Accepted: 03/15/2023] [Indexed: 03/17/2023] Open
Abstract
Flow chemistry has unlocked a world of possibilities for the synthetic community, but the idea that it is a mysterious "black box" needs to go. In this review, we show that several of the benefits of microreactor technology can be exploited to push the boundaries in organic synthesis and to unleash unique reactivity and selectivity. By "lifting the veil" on some of the governing principles behind the observed trends, we hope that this review will serve as a useful field guide for those interested in diving into flow chemistry.
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Affiliation(s)
- Luca Capaldo
- Flow Chemistry Group, Van 't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam 1098 XH Amsterdam The Netherlands
| | - Zhenghui Wen
- Flow Chemistry Group, Van 't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam 1098 XH Amsterdam The Netherlands
| | - Timothy Noël
- Flow Chemistry Group, Van 't Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam 1098 XH Amsterdam The Netherlands
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21
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Sagmeister P, Prieschl M, Kaldre D, Gadiyar C, Moessner C, Sedelmeier J, Williams JD, Kappe CO. Continuous Flow-Facilitated CB2 Agonist Synthesis, Part 1: Azidation and [3 + 2] Cycloaddition. Org Process Res Dev 2023. [DOI: 10.1021/acs.oprd.3c00035] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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22
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Prieschl M, Sagmeister P, Moessner C, Sedelmeier J, Williams JD, Kappe CO. Continuous Flow-Facilitated CB2 Agonist Synthesis, Part 2: Cyclization, Chlorination, and Amination. Org Process Res Dev 2023. [DOI: 10.1021/acs.oprd.3c00036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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23
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Usutani H, Yamamoto K, Hashimoto K. Process Intensification of a Napabucasin Manufacturing Method Utilizing Microflow Chemistry. ACS OMEGA 2023; 8:10373-10382. [PMID: 36969467 PMCID: PMC10034843 DOI: 10.1021/acsomega.2c07997] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/20/2022] [Accepted: 02/28/2023] [Indexed: 06/18/2023]
Abstract
Microflow chemistry is one of the newest and most efficient technologies used today for the safe and effective production of medicines. In this paper, we show the use of this technology in the development of a manufacturing method for napabucasin, which has potential in the treatment of colorectal and pancreatic cancers. In conventional "batch-type" reactor systems, the generation of side products can be controlled with traditional techniques such as reagent reverse-addition and temperature control. However, there is a limitation to which the yield and purity can be improved by these methods, as both are constrained by the efficiency of heat/mass transfer. Applying microflow chemistry technology alters the parameters of the constraint through the use of precise mixing in a microchannel, which offers increased possibility for improving yields and process intensification of the napabucasin process. Reported herein is a proof-of-concept study for the scale-up production of napabucasin using microflow chemistry techniques for manufacturing at the kilogram scale.
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24
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Burke A, Di Filippo M, Spiccio S, Schito AM, Caviglia D, Brullo C, Baumann M. Antimicrobial Evaluation of New Pyrazoles, Indazoles and Pyrazolines Prepared in Continuous Flow Mode. Int J Mol Sci 2023; 24:ijms24065319. [PMID: 36982392 PMCID: PMC10048858 DOI: 10.3390/ijms24065319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2023] [Revised: 03/03/2023] [Accepted: 03/07/2023] [Indexed: 03/12/2023] Open
Abstract
Multi-drug resistant bacterial strains (MDR) have become an increasing challenge to our health system, resulting in multiple classical antibiotics being clinically inactive today. As the de-novo development of effective antibiotics is a very costly and time-consuming process, alternative strategies such as the screening of natural and synthetic compound libraries is a simple approach towards finding new lead compounds. We thus report on the antimicrobial evaluation of a small collection of fourteen drug-like compounds featuring indazoles, pyrazoles and pyrazolines as key heterocyclic moieties whose synthesis was achieved in continuous flow mode. It was found that several compounds possessed significant antibacterial potency against clinical and MDR strains of the Staphylococcus and Enterococcus genera, with the lead compound (9) reaching MIC values of 4 µg/mL on those species. In addition, time killing experiments performed on compound 9 on Staphylococcus aureus MDR strains highlight its activity as bacteriostatic. Additional evaluations regarding the physiochemical and pharmacokinetic properties of the most active compounds are reported and showcased, promising drug-likeness, which warrants further explorations of the newly identified antimicrobial lead compound.
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Affiliation(s)
- Adam Burke
- Science Centre South, School of Chemistry, University College Dublin, Dublin 4, Ireland
| | - Mara Di Filippo
- Science Centre South, School of Chemistry, University College Dublin, Dublin 4, Ireland
| | - Silvia Spiccio
- Science Centre South, School of Chemistry, University College Dublin, Dublin 4, Ireland
| | - Anna Maria Schito
- Department of Surgical Sciences and Integrated Diagnostics (DISC), University of Genoa, 16132 Genoa, Italy
| | - Debora Caviglia
- Department of Surgical Sciences and Integrated Diagnostics (DISC), University of Genoa, 16132 Genoa, Italy
- Section of Medicinal Chemistry, Department of Pharmacy (DIFAR), University of Genoa, 16132 Genoa, Italy
| | - Chiara Brullo
- Section of Medicinal Chemistry, Department of Pharmacy (DIFAR), University of Genoa, 16132 Genoa, Italy
| | - Marcus Baumann
- Science Centre South, School of Chemistry, University College Dublin, Dublin 4, Ireland
- Correspondence:
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25
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Masui H, Kanda S, Fuse S. Verification of preparations of (1H-indol-3-yl)methyl electrophiles and development of their microflow rapid generation and substitution. Commun Chem 2023; 6:47. [PMID: 36871078 PMCID: PMC9985609 DOI: 10.1038/s42004-023-00837-1] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Accepted: 02/09/2023] [Indexed: 03/06/2023] Open
Abstract
Although highly reactive (1H-indol-3-yl)methyl electrophiles such as (1H-indol-3-yl)methyl halides are potential precursors for the synthesis of various indole derivatives, some researchers have reported difficulties in their preparation due to concomitant undesired dimerization/oligomerization. Nevertheless, there have been some reports on the preparation of (1H-indol-3-yl)methyl halides. To resolve this contradiction, all the previously reported preparations of (1H-indol-3-yl)methyl halides were examined. However, we could not reproduce any of these preparations, and we revised several structures of indole derivatives. Here we show the rapid (0.02 s) and mild (25 °C) generation of an (1H-indol-3-yl)methyl electrophile that enables the rapid (0.1 s) and mild (25 °C) nucleophilic substitution in a microflow reactor. Eighteen unprotected indole analogues can be successfully synthesized using the developed microflow nucleophilic substitution with various nucleophiles.
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Affiliation(s)
- Hisashi Masui
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan.
| | - Sena Kanda
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan
| | - Shinichiro Fuse
- Department of Basic Medicinal Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Furo-cho, Chikusa-ku, Nagoya, 464-8601, Japan.
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26
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An eco-friendly and very low catalyst loading continuous condensation of primary amines and 1,3 Di carbonyl compounds: Synthesis of enaminones and enaminoesters by microreactor technology. J Flow Chem 2023. [DOI: 10.1007/s41981-023-00263-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/05/2023]
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27
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Monbaliu JCM, Legros J. Will the next generation of chemical plants be in miniaturized flow reactors? LAB ON A CHIP 2023; 23:1349-1357. [PMID: 36278262 DOI: 10.1039/d2lc00796g] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
For decades, a production paradigm based on centralized, stepwise, large scale processes has dominated the chemical industry horizon. While effective to meet an ever increasing demand for high value-added chemicals, the so-called macroscopic batch reactors are also associated with inherent weaknesses and threats; some of the most obvious ones were tragically illustrated over the past decades with major industrial disasters and impactful disruptions of advanced chemical supplies. The COVID pandemic has further emphasized that a change in paradigm was necessary to sustain chemical production with an increased safety, reliable supply chains and adaptable productivities. More than a decade of research and technology development has led to alternative and effective chemical processes relying on miniaturised flow reactors (a.k.a. micro and mesofluidic reactors). Such miniaturised reactors bear the potential to solve safety concerns and to improve the reliability of chemical supply chains. Will they initiate a new paradigm for a more localized, safe and reliable chemical production?
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Affiliation(s)
- Jean-Christophe M Monbaliu
- Center for Integrated Technology and Organic Synthesis, MolSys Research Unit, University of Liège, B-4000 Liège (Sart Tilman), Belgium.
| | - Julien Legros
- COBRA Laboratory, CNRS, UNIROUEN, INSA Rouen, Normandie Université, 76000 Rouen, France.
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28
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Hornink MM, Rodrigues BG, Santos CS, Andrade LH. Continuous one-pot synthesis of new spiro-fused indoles from biobased building blocks using carbamoylation and imidation reactions under ultrasonic irradiation. J Flow Chem 2023. [DOI: 10.1007/s41981-023-00261-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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29
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Abstract
How do you get into flow? We trained in flow chemistry during postdoctoral research and are now applying it in new areas: materials chemistry, crystallization, and supramolecular synthesis. Typically, when researchers think of "flow", they are considering predominantly liquid-based organic synthesis; application to other disciplines comes with its own challenges. In this Perspective, we highlight why we use and champion flow technologies in our fields, summarize some of the questions we encounter when discussing entry into flow research, and suggest steps to make the transition into the field, emphasizing that communication and collaboration between disciplines is key.
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Affiliation(s)
- Andrea Laybourn
- Faculty
of Engineering, University of Nottingham, University Park Campus, Nottingham NG7 2RD, U.K.,
| | - Karen Robertson
- Faculty
of Engineering, University of Nottingham, University Park Campus, Nottingham NG7 2RD, U.K.,
| | - Anna G. Slater
- Department
of Chemistry and Materials Innovation Factory, University of Liverpool, Crown Street, Liverpool L69 7ZD, U.K.,
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30
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Comito M, Monguzzi R, Tagliapietra S, Palmisano G, Cravotto G. Towards Antibiotic Synthesis in Continuous-Flow Processes. Molecules 2023; 28:molecules28031421. [PMID: 36771086 PMCID: PMC9919330 DOI: 10.3390/molecules28031421] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2022] [Revised: 01/20/2023] [Accepted: 01/23/2023] [Indexed: 02/05/2023] Open
Abstract
Continuous-flow chemistry has become a mainstream process and a notable trend among emerging technologies for drug synthesis. It is routinely used in academic and industrial laboratories to generate a wide variety of molecules and building blocks. The advantages it provides, in terms of safety, speed, cost efficiency and small-equipment footprint compared to analog batch processes, have been known for some time. What has become even more important in recent years is its compliance with the quality objectives that are required by drug-development protocols that integrate inline analysis and purification tools. There can be no doubt that worldwide government agencies have strongly encouraged the study and implementation of this innovative, sustainable and environmentally friendly technology. In this brief review, we list and evaluate the development and applications of continuous-flow processes for antibiotic synthesis. This work spans the period of 2012-2022 and highlights the main cases in which either active ingredients or their intermediates were produced under continuous flow. We hope that this manuscript will provide an overview of the field and a starting point for a deeper understanding of the impact of flow chemistry on the broad panorama of antibiotic synthesis.
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Affiliation(s)
- Marziale Comito
- Dipartimento di Scienza e Tecnologia del Farmaco, University of Turin, Via Pietro Giuria 9, 10125 Turin, Italy
- Research and Development, ACS Dobfar SpA, Via Paullo 9, 20067 Tribiano, Italy
| | - Riccardo Monguzzi
- Research and Development, ACS Dobfar SpA, Via Paullo 9, 20067 Tribiano, Italy
| | - Silvia Tagliapietra
- Dipartimento di Scienza e Tecnologia del Farmaco, University of Turin, Via Pietro Giuria 9, 10125 Turin, Italy
| | - Giovanni Palmisano
- Dipartimento di Scienza e Alta Tecnologia, University of Insubria, Via Valleggio 9, 22100 Como, Italy
| | - Giancarlo Cravotto
- Dipartimento di Scienza e Tecnologia del Farmaco, University of Turin, Via Pietro Giuria 9, 10125 Turin, Italy
- Correspondence: ; Tel.: +39-011-670-7183
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31
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Zhu Y, Li S, Mu B, Yang H, Wu L, Wang Q, Wang A. Twin-screw extrusion synthesis of low-cost cobalt ferrite ceramic pigments using natural mixed-dimensional palygorskite clay. J IND ENG CHEM 2023. [DOI: 10.1016/j.jiec.2023.02.012] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/17/2023]
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32
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Tarange DL, Nayak N, Kumar A. Continuous Flow Synthesis of Substituted 3,4-Propylenedioxythiophene Derivatives. Org Process Res Dev 2023. [DOI: 10.1021/acs.oprd.2c00356] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Affiliation(s)
- Dattatray L. Tarange
- Department of Chemistry, Indian Institute of Technology-Bombay (IITB), Powai, Mumbai 400076, India
| | - Nagaraj Nayak
- Department of Chemistry, Indian Institute of Technology-Bombay (IITB), Powai, Mumbai 400076, India
| | - Anil Kumar
- Department of Chemistry, Indian Institute of Technology-Bombay (IITB), Powai, Mumbai 400076, India
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33
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Nagy BS, Fu G, Hone CA, Kappe CO, Ötvös SB. Harnessing a Continuous-Flow Persulfuric Acid Generator for Direct Oxidative Aldehyde Esterifications. CHEMSUSCHEM 2023; 16:e202201868. [PMID: 36377674 PMCID: PMC10107610 DOI: 10.1002/cssc.202201868] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/06/2022] [Revised: 10/30/2022] [Indexed: 06/16/2023]
Abstract
Persulfuric acid is a well-known oxidant in various industrial-scale purification procedures. However, due to its tendency toward explosive decomposition, its usefulness in organic synthesis remained largely underexplored. Herein, a continuous in situ persulfuric acid generator was developed and applied for oxidative esterification of aldehydes under flow conditions. Sulfuric acid served as a readily available and benign precursor to form persulfuric acid in situ. By taking advantage of the continuous-flow generator concept, safety hazards were significantly reduced, whilst a robust and effective approach was ensured for direct transformations of aldehydes to valuable esters. The process proved useful for the transformation of diverse aliphatic as well as aromatic aldehydes, while its preparative capability was verified by the multigram-scale synthesis of a pharmaceutically relevant key intermediate. The present flow protocol demonstrates the safe, sustainable, and scalable application of persulfuric acid in a manner that would not be amenable to conventional batch processing.
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Affiliation(s)
- Bence S. Nagy
- Institute of ChemistryUniversity of GrazNAWI GrazHeinrichstrasse 28A-8010GrazAustria
| | - Gang Fu
- Institute of ChemistryUniversity of GrazNAWI GrazHeinrichstrasse 28A-8010GrazAustria
| | - Christopher A. Hone
- Institute of ChemistryUniversity of GrazNAWI GrazHeinrichstrasse 28A-8010GrazAustria
- Center for Continuous Flow Synthesis and Processing (CC FLOW)Research CenterPharmaceutical Engineering GmbH (RCPE)Inffeldgasse 13A-8010GrazAustria
| | - C. Oliver Kappe
- Institute of ChemistryUniversity of GrazNAWI GrazHeinrichstrasse 28A-8010GrazAustria
- Center for Continuous Flow Synthesis and Processing (CC FLOW)Research CenterPharmaceutical Engineering GmbH (RCPE)Inffeldgasse 13A-8010GrazAustria
| | - Sándor B. Ötvös
- Institute of ChemistryUniversity of GrazNAWI GrazHeinrichstrasse 28A-8010GrazAustria
- Center for Continuous Flow Synthesis and Processing (CC FLOW)Research CenterPharmaceutical Engineering GmbH (RCPE)Inffeldgasse 13A-8010GrazAustria
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34
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Dubois MAJ, Carreras V, Adams MR, Kairouz V, Vincent-Rocan JF, Riley JG, Charette AB. Process Intensification and Increased Safety for the On-Demand Continuous Flow Synthesis of Dithiothreitol, a Crucial Component in Polymerase Chain Reaction Testing Kits. Org Process Res Dev 2023. [DOI: 10.1021/acs.oprd.2c00345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Maryne A. J. Dubois
- Center for Continuous Flow Synthesis, FRQNT Centre in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, 1375, Ave. Thérèse Lavoie-Roux, Montréal, Québec H2V 0B3, Canada
| | - Virginie Carreras
- Center for Continuous Flow Synthesis, FRQNT Centre in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, 1375, Ave. Thérèse Lavoie-Roux, Montréal, Québec H2V 0B3, Canada
| | - Matt R. Adams
- Biovectra Inc., 11 Aviation Avenue, Charlottetown, Prince Edward Island C1E 0A1, Canada
| | - Vanessa Kairouz
- Center for Continuous Flow Synthesis, FRQNT Centre in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, 1375, Ave. Thérèse Lavoie-Roux, Montréal, Québec H2V 0B3, Canada
| | | | - John G. Riley
- Biovectra Inc., 11 Aviation Avenue, Charlottetown, Prince Edward Island C1E 0A1, Canada
| | - André B. Charette
- Center for Continuous Flow Synthesis, FRQNT Centre in Green Chemistry and Catalysis, Department of Chemistry, Université de Montréal, 1375, Ave. Thérèse Lavoie-Roux, Montréal, Québec H2V 0B3, Canada
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35
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Kremsmair A, Wilke HR, Harenberg JH, Bissinger BRG, Simon MM, Alandini N, Knochel P. In Situ Quench Reactions of Enantioenriched Secondary Alkyllithium Reagents in Batch and Continuous Flow Using an I/Li-Exchange. Angew Chem Int Ed Engl 2023; 62:e202214377. [PMID: 36269064 PMCID: PMC10100098 DOI: 10.1002/anie.202214377] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2022] [Indexed: 12/05/2022]
Abstract
We report a practical in situ quench (ISQ) procedure involving the generation of chiral secondary alkyllithiums from secondary alkyl iodides (including functionalized iodides bearing an ester or a nitrile) in the presence of various electrophiles such as aldehydes, ketones, Weinreb amides, isocyanates, sulfides, or boronates. This ISQ-reaction allowed the preparation of a broad range of optically enriched ketones, alcohols, amides, sulfides and boronic acid esters in typically 90-98 % ee. Remarkably, these reactions were performed at -78 °C or -40 °C in batch. A continuous flow set-up permitted reaction temperatures between -20 °C and 0 °C and allowed a scale-up up to a 40-fold without further optimization.
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Affiliation(s)
- Alexander Kremsmair
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377, München, Germany
| | - Henrik R Wilke
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377, München, Germany
| | - Johannes H Harenberg
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377, München, Germany
| | - Benjamin R G Bissinger
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377, München, Germany
| | - Matthias M Simon
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377, München, Germany
| | - Nurtalya Alandini
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377, München, Germany
| | - Paul Knochel
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 5-13, Haus F, 81377, München, Germany
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36
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Veeramani K, Shinde M, Eda VVR, Darapaneni BC, Hindupur RM, Madarapu SR, Sen S, Oruganti S. Alternate end-game strategies towards Nirmatrelvir synthesis: Defining a continuous flow process for the preparation of an anti-COVID drug. Tetrahedron Lett 2023. [DOI: 10.1016/j.tetlet.2023.154344] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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37
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O'Brien M, Moraru R. An Automated Computer-Vision "Bubble-Counting" Technique to Characterise CO 2 Dissolution into an Acetonitrile Flow Stream in a Teflon AF-2400 Tube-in-Tube Flow Device. Chempluschem 2023; 88:e202200167. [PMID: 35997644 DOI: 10.1002/cplu.202200167] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/11/2022] [Revised: 06/30/2022] [Indexed: 01/28/2023]
Abstract
A Teflon AF-2400 based tube-in-tube device was used to generate flow streams of CO2 in acetonitrile and a computer-vision based 'bubble counting' technique was used to estimate the amount of CO2 that had passed into solution whilst in the tube-in-tube device by quantifying the amount of CO2 that left solution (forming separate gas-phase segments) downstream of the back-pressure regulator. For both CO2 pressures used, there appeared to be a minimum residence time below which no CO2 was observed to leave solution. This was assumed to be due to residual CO2 below (or close to) the saturation concentration at atmospheric pressure and, by taking this into account, we were able to fit curves corresponding to simple gradient-driven diffusion and which closely matched previously obtained colorimetric titration data for the same system. The estimated value for the residual concentration of CO2 (0.37 M) is higher than, but in reasonable general correspondence with, saturation concentrations previously reported for CO2 in acetonitrile (0.27 M).
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Affiliation(s)
- Matthew O'Brien
- The Lennard-Jones Laboratories, Keele University, Keele, Borough of Newcastle-under-Lyme, ST5 5BG, Staffordshire, UK
| | - Ruxandra Moraru
- The Lennard-Jones Laboratories, Keele University, Keele, Borough of Newcastle-under-Lyme, ST5 5BG, Staffordshire, UK
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38
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García-Lacuna J, Baumann M. Inline purification in continuous flow synthesis – opportunities and challenges. Beilstein J Org Chem 2022. [DOI: 10.3762/bjoc.18.182] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Continuous flow technology has become the method of choice for many academic and industrial researchers when developing new routes to chemical compounds of interest. With this technology maturing over the last decades, robust and oftentimes automated processes are now commonly exploited to generate fine chemical building blocks. The integration of effective inline analysis and purification tools is thereby frequently exploited to achieve effective and reliable flow processes. This perspective article summarizes recent applications of different inline purification techniques such as chromatography, extractions, and crystallization from academic and industrial laboratories. A discussion of the advantages and drawbacks of these tools is provided as a guide to aid researchers in selecting the most appropriate approach for future applications. It is hoped that this perspective contributes to new developments in this field in the context of process and cost efficiency, sustainability and industrial uptake of new flow chemistry tools developed in academia.
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39
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TfOH-catalyzed three-component synthesis of Dithiocarbamates from α-Diazoesters under continuous flow conditions. J Flow Chem 2022. [DOI: 10.1007/s41981-022-00249-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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40
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Liu Y, Okada I, Tsuda A. Flow Photo-On-Demand Phosgenation Reactions with Chloroform. Org Process Res Dev 2022. [DOI: 10.1021/acs.oprd.2c00322] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
Affiliation(s)
- Yue Liu
- Department of Chemistry, Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
| | - Itsuumi Okada
- Department of Chemistry, Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
| | - Akihiko Tsuda
- Department of Chemistry, Graduate School of Science, Kobe University, 1-1 Rokkodai-cho, Nada-ku, Kobe 657-8501, Japan
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41
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Mulks FF, Pinho B, Platten AW, Andalibi MR, Expósito AJ, Edler KJ, Hevia E, Torrente-Murciano L. Continuous, stable, and safe organometallic reactions in flow at room temperature assisted by deep eutectic solvents. Chem 2022. [DOI: 10.1016/j.chempr.2022.11.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/03/2022]
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42
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Masui H, Fuse S. Micro-Flow <i>N</i>-Acylation Using Highly Electrophilic Acyl Ammonium Cations for Peptide and Urethane-Protected <i>N</i>-Carboxyanhydride Syntheses. J SYN ORG CHEM JPN 2022. [DOI: 10.5059/yukigoseikyokaishi.80.986] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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43
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Wu B, Jiang X, Yang Y, Du H, Shi X, Li Z, Pei C. Continuous-Flow Oxidation of Amines Based on Nitrogen-Rich Heterocycles: A Facile and Sustainable Approach for Promising Nitro Derivatives. Org Process Res Dev 2022. [DOI: 10.1021/acs.oprd.2c00162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Bo Wu
- State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, P. R. China
| | - Xiue Jiang
- State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, P. R. China
| | - Yalin Yang
- State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, P. R. China
| | - Huiying Du
- State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, P. R. China
| | - Xianrui Shi
- State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, P. R. China
- Xi′an Modern Chemistry Research Institute, Xi′an 710065, P. R. China
| | - Zhaoqian Li
- State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, P. R. China
| | - Chonghua Pei
- State Key Laboratory of Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, P. R. China
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44
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Burlingham SJ, Guijarro D, Bosque I, Chinchilla R, Gonzalez-Gomez JC. Visible-light-mediated decarboxylative ( E)-alkenylation of aliphatic carboxylic acids with aryl styryl sulfones under metal-free conditions. Org Biomol Chem 2022; 20:7923-7928. [PMID: 36178275 DOI: 10.1039/d2ob01360f] [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
The decarboxylative alkenylation of aliphatic carboxylic acids with aryl styryl sulfones is efficiently catalyzed by riboflavin tetraacetate under visible light irradiation at room temperature. This metal-free protocol is cost-efficient, environmentally friendly and provides the corresponding olefins with excellent (E)-diastereocontrol. The methodology can also be used to prepare internal alkynes regioselectively by using alkynyl sulfones as radical acceptors. The suitability as building blocks of the olefins obtained was demonstrated by performing an (E)- to (Z) photoisomerization, an iron-catalyzed allylic substitution of the phenoxy group derived from the 2-phenoxycarboxylic acid substrates, as well as syn-epoxidations, and diastereoselective intramolecular iodoarylations. Based on control experiments and DFT calculations, we proposed a reaction mechanism that accounts for the regio- and diastereo-selectivity observed.
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Affiliation(s)
- Sarah-Jayne Burlingham
- Instituto de Síntesis Orgánica (ISO) and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain.
| | - David Guijarro
- Instituto de Síntesis Orgánica (ISO) and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain.
| | - Irene Bosque
- Instituto de Síntesis Orgánica (ISO) and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain.
| | - Rafael Chinchilla
- Instituto de Síntesis Orgánica (ISO) and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain.
| | - Jose C Gonzalez-Gomez
- Instituto de Síntesis Orgánica (ISO) and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Alicante, Apdo. 99, 03080 Alicante, Spain.
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45
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Griffiths OM, Ley SV. Multicomponent Direct Assembly of N-Heterospirocycles Facilitated by Visible-Light-Driven Photocatalysis. J Org Chem 2022; 87:13204-13223. [PMID: 36103403 PMCID: PMC9552240 DOI: 10.1021/acs.joc.2c01684] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
![]()
N-heterospirocycles are interesting
structural
units found in both natural products and medicinal compounds but have
relatively few reliable methods for their synthesis. Here, we enlist
the photocatalytic generation of N-centered radicals
to construct β-spirocyclic pyrrolidines from N-allylsulfonamides and alkenes. A variety of β-spirocyclic
pyrrolidines have been constructed, including drug derivatives, in
moderate to very good yields. Further derivatization of the products
has also been demonstrated as has a viable scale-up procedure, making
use of flow chemistry techniques.
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Affiliation(s)
- Oliver M. Griffiths
- Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K
| | - Steven V. Ley
- Yusuf Hamied Department of Chemistry, University of Cambridge, Cambridge CB2 1EW, U.K
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46
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Grillo G, Cintas P, Colia M, Calcio Gaudino E, Cravotto G. Process intensification in continuous flow organic synthesis with enabling and hybrid technologies. FRONTIERS IN CHEMICAL ENGINEERING 2022. [DOI: 10.3389/fceng.2022.966451] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Industrial organic synthesis is time and energy consuming, and generates substantial waste. Traditional conductive heating and mixing in batch reactors is no longer competitive with continuous-flow synthetic methods and enabling technologies that can strongly promote reaction kinetics. These advances lead to faster and simplified downstream processes with easier workup, purification and process scale-up. In the current Industry 4.0 revolution, new advances that are based on cyber-physical systems and artificial intelligence will be able to optimize and invigorate synthetic processes by connecting cascade reactors with continuous in-line monitoring and even predict solutions in case of unforeseen events. Alternative energy sources, such as dielectric and ohmic heating, ultrasound, hydrodynamic cavitation, reactive extruders and plasma have revolutionized standard procedures. So-called hybrid or hyphenated techniques, where the combination of two different energy sources often generates synergistic effects, are also worthy of mention. Herein, we report our consolidated experience of all of these alternative techniques.
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47
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Continuous production of 3,5,5-trimethylhexanoyl chloride and CFD simulations of single-phase flow in an advanced-flow reactor. J Taiwan Inst Chem Eng 2022. [DOI: 10.1016/j.jtice.2022.104465] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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48
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Nakahara Y, Mendelsohn BA, Matsuda Y. Antibody–Drug Conjugate Synthesis Using Continuous Flow Microreactor Technology. Org Process Res Dev 2022. [DOI: 10.1021/acs.oprd.2c00217] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yuichi Nakahara
- Ajinomoto Co., Inc., 1-1 Suzuki-cho, Kawasaki, Kanagawa 210-8681, Japan
| | - Brian A. Mendelsohn
- Ajinomoto Bio-Pharma Services, 11040 Roselle Street, San Diego, California 92121, United States
| | - Yutaka Matsuda
- Ajinomoto Bio-Pharma Services, 11040 Roselle Street, San Diego, California 92121, United States
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49
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Luo H, Ren J, Sun Y, Liu Y, Zhou F, Shi G, Zhou J. Recent advances in chemical fixation of CO2 based on flow chemistry. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.107782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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50
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Wan L, Kong G, Liu M, Jiang M, Cheng D, Chen F. Flow chemistry in the multi-step synthesis of natural products. GREEN SYNTHESIS AND CATALYSIS 2022. [DOI: 10.1016/j.gresc.2022.07.007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/15/2022] Open
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