1
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Sánchez JD, Gómez-Carpintero J, González JF, Menéndez JC. Twenty-first century antiepileptic drugs. An overview of their targets and synthetic approaches. Eur J Med Chem 2024; 272:116476. [PMID: 38759456 DOI: 10.1016/j.ejmech.2024.116476] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2024] [Revised: 05/01/2024] [Accepted: 05/02/2024] [Indexed: 05/19/2024]
Abstract
The therapeutic use of the traditional drugs against epilepsy has been hindered by their toxicity and low selectivity. These limitations have stimulated the design and development of new generations of antiepileptic drugs. This review explores the molecular targets and synthesis of the antiepileptic drugs that have entered the market in the 21st century, with a focus on manufacturer synthesis.
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Affiliation(s)
- J Domingo Sánchez
- Unidad de Química Orgánica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense, 28040, Madrid, Spain
| | - Jorge Gómez-Carpintero
- Unidad de Química Orgánica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense, 28040, Madrid, Spain
| | - Juan F González
- Unidad de Química Orgánica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense, 28040, Madrid, Spain
| | - J Carlos Menéndez
- Unidad de Química Orgánica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense, 28040, Madrid, Spain.
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2
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Wang SJ, Zhao MY, Zhao PC, Zhang W, Rao GW. Research Status, Synthesis and Clinical Application of Antiepileptic Drugs. Curr Med Chem 2024; 31:410-452. [PMID: 36650655 DOI: 10.2174/0929867330666230117160632] [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: 06/14/2022] [Revised: 10/25/2022] [Accepted: 11/03/2022] [Indexed: 01/19/2023]
Abstract
According to the 2017 ILAE's official definition, epilepsy is a slow brain disease state characterized by recurrent episodes. Due to information released by ILAE in 2017, it can be divided into four types, including focal epilepsy, generalized epilepsy, combined generalized, and focal epilepsy, and unknown epilepsy. Since 1989, 24 new antiepileptic drugs have been approved to treat different types of epilepsy. Besides, there are a variety of antiepileptic medications under clinical monitoring. These novel antiepileptic drugs have plenty of advantages. Over the past 33 years, there have been many antiepileptic drugs on the mearket, but no one has been found that can completely cure epilepsy. In this paper, the mentioned drugs were classified according to their targets, and the essential information, and clinical studies of each drug were described. The structure-activity relationship of different chemical structures was summarized. This paper provides help for the follow-up research on epilepsy drugs.
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Affiliation(s)
- Si-Jie Wang
- College of Pharmaceutical Science, Institute of Drug Development & Chemical Biology, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Min-Yan Zhao
- College of Pharmaceutical Science, Institute of Drug Development & Chemical Biology, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Peng-Cheng Zhao
- College of Pharmaceutical Science, Institute of Drug Development & Chemical Biology, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Wen Zhang
- College of Pharmaceutical Science, Institute of Drug Development & Chemical Biology, Zhejiang University of Technology, Hangzhou 310014, P.R. China
| | - Guo-Wu Rao
- College of Pharmaceutical Science, Institute of Drug Development & Chemical Biology, Zhejiang University of Technology, Hangzhou 310014, P.R. China
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3
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Liu T, Cao Z, Huang Y, Wan Y, Wu J, Hsieh CY, Hou T, Kang Y. SynCluster: Reaction Type Clustering and Recommendation Framework for Synthesis Planning. JACS AU 2023; 3:3446-3461. [PMID: 38155655 PMCID: PMC10751778 DOI: 10.1021/jacsau.3c00607] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Revised: 11/07/2023] [Accepted: 11/08/2023] [Indexed: 12/30/2023]
Abstract
AI-assisted synthesis planning has emerged as a valuable tool in accelerating synthetic chemistry for the discovery of new drugs and materials. The template-free approach, which showcases superior generalization capabilities, is seen as the mainstream direction in this field. However, it remains unclear whether such an end-to-end approach can achieve problem-solving performance on par with experienced chemists without fully revealing insights into the chemical mechanisms involved. Moreover, there is a lack of unified and chemically inspired frameworks for improving multitask reaction predictions in this area. In this study, we have addressed these challenges by investigating the impact of fine-grained reaction-type labels on multiple downstream tasks and propose a novel framework named SynCluster. This framework incorporates unsupervised clustering cues into the baseline models and identifies plausible chemical subspaces which is compatible with multitask extensions and can serve as model-independent indicators to effectively enhance the performance of multiple downstream tasks. In retrosynthesis prediction, SynCluster achieves significant improvements of 4.1 and 11.0% in top-1 and top-10 prediction accuracy, respectively, compared to the baseline Molecular Transformer, and achieves a notable enhancement of 13.9% in top-10 accuracy when combined with Retroformer. By incorporating simplified molecular-input line-entry system augmentation, our framework achieves higher top-10 accuracy compared to state-of-the-art sequence-based retrosynthesis models and improves over the baseline on the diversity and validity of reactants. SynCluster also achieves 94.9% top-10 accuracy in forward synthesis prediction and 51.5% top-10 Maxfrag accuracy in reagent prediction. Overall, SynCluster provides a fresh perspective with chemical interpretability and reinforcement of domain knowledge in the synthesis design. It offers a promising solution for improving the accuracy and efficiency of AI-assisted synthesis planning and bridges the gap between template-free approaches and the problem-solving abilities of experienced chemists.
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Affiliation(s)
- Tiantao Liu
- Innovation
Institute for Artificial Intelligence in Medicine of Zhejiang University,
College of Pharmaceutical Sciences and Cancer Center, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Zheng Cao
- College
of Computer Science and Technology, Zhejiang
University, Hangzhou 310027, Zhejiang, China
| | - Yuansheng Huang
- Innovation
Institute for Artificial Intelligence in Medicine of Zhejiang University,
College of Pharmaceutical Sciences and Cancer Center, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Yue Wan
- Tencent
Quantum Laboratory, Shenzhen 518057, Guangdong, China
| | - Jian Wu
- Second
Affiliated Hospital School of Medicine, and School of Public Health, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Chang-Yu Hsieh
- Innovation
Institute for Artificial Intelligence in Medicine of Zhejiang University,
College of Pharmaceutical Sciences and Cancer Center, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Tingjun Hou
- Innovation
Institute for Artificial Intelligence in Medicine of Zhejiang University,
College of Pharmaceutical Sciences and Cancer Center, Zhejiang University, Hangzhou 310058, Zhejiang, China
| | - Yu Kang
- Innovation
Institute for Artificial Intelligence in Medicine of Zhejiang University,
College of Pharmaceutical Sciences and Cancer Center, Zhejiang University, Hangzhou 310058, Zhejiang, China
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4
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Thai JE, Roach MC, Reynolds MM. Continuous flow catalysis with CuBTC improves reaction time for synthesis of xanthene derivatives. Front Chem 2023; 11:1259835. [PMID: 37908233 PMCID: PMC10613637 DOI: 10.3389/fchem.2023.1259835] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2023] [Accepted: 10/04/2023] [Indexed: 11/02/2023] Open
Abstract
The copper-based metal-organic framework (MOF) CuBTC (where H3BTC = benzene-1,3,5-tricarboxylate) has been shown to be an efficient heterogeneous catalyst for the generation of 1,8-dioxo-octa-hydro xanthene derivatives, which are valuable synthetic targets for the pharmaceutical industry. We have applied this catalytic capability of CuBTC to a continuous flow system to produce the open chain form of 3,3,6,6-tetramethyl-9-phenyl-3,4,5,6,7,9-hexahydro-1H-xanthene-1,8(2H)-dione, a xanthene derivative from benzaldehyde and dimedone. An acid work-up after producing the open chain form of the xanthene derivative was used to achieve ring closure and form the final xanthene product. The CuBTC used to catalyze the reaction under continuous flow was confirmed to be stable throughout this process via analysis by SEM, pXRD, and FT-IR spectroscopy, elemental analysis, and XPS. The reaction to produce the open-chain form of the xanthene derivative produced an average yield of 33% ± 14% under the continuous flow (compared to 33% ± 0.12% of performing it under batch conditions). Based on the data obtained from this work, the continuous flow system required 22.5x less time to produce the desired xanthene derivative at comparable yields to batch reaction conditions. These results would allow for the xanthene derivative to be produced much faster, at a lower cost, and require less personal time while also removing the need to perform catalyst remove post reaction.
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Affiliation(s)
- Jonathan E. Thai
- Department of Chemistry, Colorado State University, Fort Collins, CO, United States
| | - Madeline C. Roach
- School of Biomedical Engineering, Colorado State University, Fort Collins, CO, United States
| | - Melissa M. Reynolds
- Department of Chemistry, Colorado State University, Fort Collins, CO, United States
- School of Biomedical Engineering, Colorado State University, Fort Collins, CO, United States
- Dapartment of Chemical and Biological Engineering, Colorado State University, Fort Collins, CO, United States
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5
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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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6
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Kwon YJ, Lee SG, Kim WS. Continuous Flow Synthesis of N-Sulfonyl-1,2,3-triazoles for Tandem Relay Cu/Rh Dual Catalysis. J Org Chem 2023; 88:1200-1214. [PMID: 36598492 DOI: 10.1021/acs.joc.2c02808] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The continuous flow synthesis of N-sulfonyl-1,2,3-triazoles, which are convenient reactive azavinyl carbene precursors, for tandem relay Cu/Rh dual catalysis has been developed. Most reactions readily proceeded at 75 °C in a short residence time of 13.09 min in the presence of 2.5 mol % of CuTC. The scope of the reactions was explored by synthesizing diversely functionalized N-sulfonyl and sulfamoyl triazoles in yields ranging from 92 to 98%. To demonstrate the scalability of the process, the reaction was conducted on a 5.4 mmol scale with residence and collection times of 13.09 and 60 min, respectively. Furthermore, a series of controlled experiments were performed to investigate the compatibility of Cu and Rh in a batch or a continuous flow system. Finally, the first integrated flow system using the azavinyl carbene intermediate under the tandem relay Cu/Rh dual catalysis was developed for the synthesis of various cis-diamino enones from alkynes and sulfonyl azides.
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Affiliation(s)
- Yong-Ju Kwon
- Department of Chemistry and Nanoscience, Ewha Womans University, Seoul03760, South Korea
| | - Sang-Gi Lee
- Department of Chemistry and Nanoscience, Ewha Womans University, Seoul03760, South Korea
| | - Won-Suk Kim
- Department of Chemistry and Nanoscience, Ewha Womans University, Seoul03760, South Korea
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7
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Brufani G, Valentini F, Rossini G, Rosignoli L, Gu Y, Liu P, Vaccaro L. Waste-minimized continuous flow copper-catalyzed azide-alkyne cycloaddition with low metal contamination. GREEN SYNTHESIS AND CATALYSIS 2023. [DOI: 10.1016/j.gresc.2023.01.004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023] Open
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8
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Horáková P, Kočí K. Continuous-Flow Chemistry and Photochemistry for Manufacturing of Active Pharmaceutical Ingredients. Molecules 2022; 27:molecules27238536. [PMID: 36500629 PMCID: PMC9738912 DOI: 10.3390/molecules27238536] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/19/2022] [Revised: 11/18/2022] [Accepted: 11/30/2022] [Indexed: 12/11/2022] Open
Abstract
An active pharmaceutical ingredient (API) is any substance in a pharmaceutical product that is biologically active. That means the specific molecular entity is capable of achieving a defined biological effect on the target. These ingredients need to meet very strict limits; chemical and optical purity are considered to be the most important ones. A continuous-flow synthetic methodology which utilizes a continuously flowing stream of reactive fluids can be easily combined with photochemistry, which works with the chemical effects of light. These methods can be useful tools to meet these strict limits. Both of these methods are unique and powerful tools for the preparation of natural products or active pharmaceutical ingredients and their precursors with high structural complexity under mild conditions. This review shows some main directions in the field of active pharmaceutical ingredients' preparation using continuous-flow chemistry and photochemistry with numerous examples of industry and laboratory-scale applications.
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Affiliation(s)
- Pavlína Horáková
- Institute of Environmental Technology, CEET, VŠB-Technical University of Ostrava, 708 00 Ostrava, Czech Republic
- TEVA Czech Industries s.r.o., 747 70 Opava, Czech Republic
- Correspondence:
| | - Kamila Kočí
- Institute of Environmental Technology, CEET, VŠB-Technical University of Ostrava, 708 00 Ostrava, Czech Republic
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9
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Bhattacherjee D, Kovalev IS, Kopchuk DS, Rahman M, Santra S, Zyryanov GV, Das P, Purohit R, Rusinov VL, Chupakhin ON. Mechanochemical Approach towards Multi-Functionalized 1,2,3-Triazoles and Anti-Seizure Drug Rufinamide Analogs Using Copper Beads. MOLECULES (BASEL, SWITZERLAND) 2022; 27:molecules27227784. [PMID: 36431885 PMCID: PMC9693609 DOI: 10.3390/molecules27227784] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/09/2022] [Revised: 11/04/2022] [Accepted: 11/07/2022] [Indexed: 11/16/2022]
Abstract
Highly regiospecific, copper-salt-free and neat conditions have been demonstrated for the 1,3-dipolar azide-alkyne cycloaddition (AAC) reactions under mechanochemical conditions. A group of structurally challenging alkynes and heterocyclic derivatives was efficiently implemented to achieve highly functionalized 1,4-disubstituted-1,2,3-triazoles in good to excellent yield by using the Cu beads without generation of unwanted byproducts. Furthermore, the high-speed ball milling (HSBM) strategy has also been extended to the synthesis of the commercially available pharmaceutical agent, Rufinamide, an antiepileptic drug (AED) and its analogues. The same strategy was also applied for the synthesis of the Cl-derivative of Rufinamide. Analysis of the single crystal XRD data of the triazole was also performed for the final structural confirmation. The Cu beads are easily recoverable from the reaction mixture and used for the further reactions without any special treatment.
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Affiliation(s)
- Dhananjay Bhattacherjee
- Department of Organic and Biomolecular Chemistry, Ural Federal University, 19 Mira Street, 620002 Yekaterinburg, Russia
| | - Igor S. Kovalev
- Department of Organic and Biomolecular Chemistry, Ural Federal University, 19 Mira Street, 620002 Yekaterinburg, Russia
| | - Dmitry S. Kopchuk
- Department of Organic and Biomolecular Chemistry, Ural Federal University, 19 Mira Street, 620002 Yekaterinburg, Russia
- I. Ya. Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 22 S. Kovalevskoi Street, 620219 Yekaterinburg, Russia
| | - Matiur Rahman
- Department of Organic and Biomolecular Chemistry, Ural Federal University, 19 Mira Street, 620002 Yekaterinburg, Russia
| | - Sougata Santra
- Department of Organic and Biomolecular Chemistry, Ural Federal University, 19 Mira Street, 620002 Yekaterinburg, Russia
- Correspondence:
| | - Grigory V. Zyryanov
- Department of Organic and Biomolecular Chemistry, Ural Federal University, 19 Mira Street, 620002 Yekaterinburg, Russia
- I. Ya. Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 22 S. Kovalevskoi Street, 620219 Yekaterinburg, Russia
| | - Pralay Das
- Chemical Technology Division, CSIR-Institute of Himalayan Bioresource Technology (CSIR-IHBT), Palampur 176061, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Rituraj Purohit
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
- Structural Bioinformatics Lab, CSIR-Institute of Himalayan Bioresource Technology (CSIR-IHBT), Palampur 176061, India
| | - Vladimir L. Rusinov
- Department of Organic and Biomolecular Chemistry, Ural Federal University, 19 Mira Street, 620002 Yekaterinburg, Russia
- I. Ya. Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 22 S. Kovalevskoi Street, 620219 Yekaterinburg, Russia
| | - Oleg N. Chupakhin
- Department of Organic and Biomolecular Chemistry, Ural Federal University, 19 Mira Street, 620002 Yekaterinburg, Russia
- I. Ya. Postovsky Institute of Organic Synthesis, Ural Branch of the Russian Academy of Sciences, 22 S. Kovalevskoi Street, 620219 Yekaterinburg, Russia
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10
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Drelinkiewicz D, Whitby RJ. A practical flow synthesis of 1,2,3-triazoles. RSC Adv 2022; 12:28910-28915. [PMID: 36320728 PMCID: PMC9551675 DOI: 10.1039/d2ra04727f] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Accepted: 10/01/2022] [Indexed: 11/07/2022] Open
Abstract
A robust and versatile protocol for synthesis of 1-monosubstituted and 1,4-disubstituted 1H-1,2,3-triazoles was established under continuous flow conditions using copper-on-charcoal as a heterogeneous catalyst. This methodology allowed for the synthesis of a diverse set of substituted 1,2,3-triazoles with good functional group tolerance and high yields. 2-Ynoic acids were also used as small-chain alkyne donors in a decarboxylation/cycloaddition cascade, allowing gaseous reagents to be bypassed, delivering desired triazoles in high yields. The developed methodology was used to synthesize an antiepileptic agent, rufinamide, which was obtained in 96% isolated yield. Copper-on-charcoal is an excellent heterogeneous catalyst for the alkyne–azide cycloaddition reaction performed under continuous flow conditions. 2-Ynoic acids undergo decarboxylation/cycloaddition cascade giving triazoles bearing small alkyl chains.![]()
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Affiliation(s)
- Dawid Drelinkiewicz
- School of Chemistry, Faculty of Engineering and Physical Sciences, The University of SouthamptonSouthamptonUK
| | - Richard J. Whitby
- School of Chemistry, Faculty of Engineering and Physical Sciences, The University of SouthamptonSouthamptonUK
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11
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Brandão P, Pineiro M, M.V.D. Pinho e Melo T. Flow Chemistry: Sequential Flow Processes for the Synthesis of Heterocycles. HETEROCYCLES 2022. [DOI: 10.1002/9783527832002.ch11] [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: 11/10/2022]
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12
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Volk AA, Campbell ZS, Ibrahim MYS, Bennett JA, Abolhasani M. Flow Chemistry: A Sustainable Voyage Through the Chemical Universe en Route to Smart Manufacturing. Annu Rev Chem Biomol Eng 2022; 13:45-72. [PMID: 35259931 DOI: 10.1146/annurev-chembioeng-092120-024449] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Microfluidic devices and systems have entered many areas of chemical engineering, and the rate of their adoption is only increasing. As we approach and adapt to the critical global challenges we face in the near future, it is important to consider the capabilities of flow chemistry and its applications in next-generation technologies for sustainability, energy production, and tailor-made specialty chemicals. We present the introduction of microfluidics into the fundamental unit operations of chemical engineering. We discuss the traits and advantages of microfluidic approaches to different reactive systems, both well-established and emerging, with a focus on the integration of modular microfluidic devices into high-efficiency experimental platforms for accelerated process optimization and intensified continuous manufacturing. Finally, we discuss the current state and new horizons in self-driven experimentation in flow chemistry for both intelligent exploration through the chemical universe and distributed manufacturing. Expected final online publication date for the Annual Review of Chemical and Biomolecular Engineering, Volume 13 is October 2022. Please see http://www.annualreviews.org/page/journal/pubdates for revised estimates.
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Affiliation(s)
- Amanda A Volk
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina, USA; , , , ,
| | - Zachary S Campbell
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina, USA; , , , ,
| | - Malek Y S Ibrahim
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina, USA; , , , ,
| | - Jeffrey A Bennett
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina, USA; , , , ,
| | - Milad Abolhasani
- Department of Chemical and Biomolecular Engineering, North Carolina State University, Raleigh, North Carolina, USA; , , , ,
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13
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Seemann A, Panten J, Kirschning A. Flow Chemistry under Extreme Conditions: Synthesis of Macrocycles with Musklike Olfactoric Properties. J Org Chem 2021; 86:13924-13933. [PMID: 33899468 DOI: 10.1021/acs.joc.1c00663] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Starting from small cyclic ketones, continuous flow synthesis is used to produce medium-sized rings and macrocycles that are relevant for the fragrance industry. Triperoxides are important intermediates in this process and are pyrolyzed at temperatures above 250 °C. The synthesis is carried out in two continuously operated flow reactors connected by a membrane-operated separator. The practicality of flow chemistry is impressively demonstrated in this work by the use of hazardous reagent mixtures (30% H2O2, 65% HNO3) and the pyrolysis of no less problematic peroxides. All new macrocycles were tested for their olfactory properties in relation to musk.
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Affiliation(s)
- Alexandra Seemann
- Institute of Organic Chemistry, Leibniz University Hannover, Schneiderberg 1B, 30167 Hannover, Germany
| | | | - Andreas Kirschning
- Institute of Organic Chemistry, Leibniz University Hannover, Schneiderberg 1B, 30167 Hannover, Germany
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14
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Ley SV, Chen Y, Robinson A, Otter B, Godineau E, Battilocchio C. A Comment on Continuous Flow Technologies within the Agrochemical Industry. Org Process Res Dev 2021. [DOI: 10.1021/acs.oprd.0c00534] [Citation(s) in RCA: 13] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Steven V. Ley
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Yiding Chen
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K
| | - Alan Robinson
- Process Research, Syngenta Crop Protection, Schaffhauserstrasse 101, CH-4332 Stein, Switzerland
| | - Benjamin Otter
- Process Technology New Active Ingredients, Syngenta Crop Protection, CH-4333 Münchwilen, Switzerland
| | - Edouard Godineau
- Process Research, Syngenta Crop Protection, Schaffhauserstrasse 101, CH-4332 Stein, Switzerland
| | - Claudio Battilocchio
- Process Research, Syngenta Crop Protection, Schaffhauserstrasse 101, CH-4332 Stein, Switzerland
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15
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Domokos A, Nagy B, Szilágyi B, Marosi G, Nagy ZK. Integrated Continuous Pharmaceutical Technologies—A Review. Org Process Res Dev 2021. [DOI: 10.1021/acs.oprd.0c00504] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- András Domokos
- Budapest University of Technology and Economics, Organic Chemistry and Technology Department, H-1111 Budapest, Hungary
| | - Brigitta Nagy
- Budapest University of Technology and Economics, Organic Chemistry and Technology Department, H-1111 Budapest, Hungary
| | - Botond Szilágyi
- Budapest University of Technology and Economics, Faculty of Chemical Technology and Biotechnology, H-1111 Budapest, Hungary
| | - György Marosi
- Budapest University of Technology and Economics, Organic Chemistry and Technology Department, H-1111 Budapest, Hungary
| | - Zsombor Kristóf Nagy
- Budapest University of Technology and Economics, Organic Chemistry and Technology Department, H-1111 Budapest, Hungary
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16
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Sun M, Li J, Liang C, Shan C, Shen X, Cheng R, Ma Y, Ye J. Practical and rapid construction of 2-pyridyl ketone library in continuous flow. J Flow Chem 2020. [DOI: 10.1007/s41981-020-00120-7] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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17
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Zhang X, Cui X, Wang W, Zeng T, Wang Y, Tan Y, Liu D, Wang X, Li Y. Base‐Promoted Regiospecific Synthesis of Fully Substituted 1,2,3‐Triazoles and 1,5‐Disubstituted 1,2,3‐Triazoles. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000479] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Xueying Zhang
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Provincial Key Laboratory for Research and Development of Tropical Herbs, School of Pharmacy Hainan Medical University Haikou 571199 P. R. China
| | - Xue Cui
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Provincial Key Laboratory for Research and Development of Tropical Herbs, School of Pharmacy Hainan Medical University Haikou 571199 P. R. China
| | - Wei Wang
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Provincial Key Laboratory for Research and Development of Tropical Herbs, School of Pharmacy Hainan Medical University Haikou 571199 P. R. China
| | - Tingting Zeng
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Provincial Key Laboratory for Research and Development of Tropical Herbs, School of Pharmacy Hainan Medical University Haikou 571199 P. R. China
| | - Yan Wang
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Provincial Key Laboratory for Research and Development of Tropical Herbs, School of Pharmacy Hainan Medical University Haikou 571199 P. R. China
| | - Yinfeng Tan
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Provincial Key Laboratory for Research and Development of Tropical Herbs, School of Pharmacy Hainan Medical University Haikou 571199 P. R. China
| | - Dongyan Liu
- Department Dongzhimen Hospital Beijing University of Chinese Medicine Beijing 100700 P. R. China
| | - Xuesong Wang
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Provincial Key Laboratory for Research and Development of Tropical Herbs, School of Pharmacy Hainan Medical University Haikou 571199 P. R. China
| | - Youbin Li
- Key Laboratory of Tropical Translational Medicine of Ministry of Education, Hainan Provincial Key Laboratory for Research and Development of Tropical Herbs, School of Pharmacy Hainan Medical University Haikou 571199 P. R. China
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18
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Abstract
Biocatalysts provide a number of advantages such as high selectivity, the ability to operate under mild reaction conditions and availability from renewable resources that are of interest in the development of bioreactors for applications in the pharmaceutical and other sectors. The use of oxidoreductases in biocatalytic reactors is primarily focused on the use of NAD(P)-dependent enzymes, with the recycling of the cofactor occurring via an additional enzymatic system. The use of electrochemically based systems has been limited. This review focuses on the development of electrochemically based biocatalytic reactors. The mechanisms of mediated and direct electron transfer together with methods of immobilising enzymes are briefly reviewed. The use of electrochemically based batch and flow reactors is reviewed in detail with a focus on recent developments in the use of high surface area electrodes, enzyme engineering and enzyme cascades. A future perspective on electrochemically based bioreactors is presented.
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19
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Spano MB, Tran BH, Majumdar S, Weiss GA. 3D-Printed Labware for High-Throughput Immobilization of Enzymes. J Org Chem 2020; 85:8480-8488. [PMID: 32502347 PMCID: PMC9096805 DOI: 10.1021/acs.joc.0c00789] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
In continuous flow biocatalysis, chemical transformations can occur under milder, greener, more scalable, and safer conditions than conventional organic synthesis. However, the method typically involves extensive screening to optimize each enzyme's immobilization on its solid support material. The task of weighing solids for large numbers of experiments poses a bottleneck for screening enzyme immobilization conditions. For example, screening conditions often require multiple replicates exploring different support chemistries, buffer compositions, and temperatures. Thus, we report 3D-printed labware designed to measure and handle solids in multichannel format and expedite screening of enzyme immobilization conditions. To demonstrate the generality of these advances, alkaline phosphatase, glucose dehydrogenase, and laccase were screened for immobilization efficiency on seven resins. The results illustrate the requirements for optimization of each enzyme's loading and resin choice for optimal catalytic performance. Here, 3D-printed labware can decrease the requirements for an experimentalist's time by >95%. The approach to rapid optimization of enzyme immobilization is applicable to any enzyme and many solid support resins. Furthermore, the reported devices deliver precise and accurate aliquots of essentially any granular solid material.
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Affiliation(s)
- Michael B. Spano
- Department of Chemistry, University of California, Irvine, California, 92697-2025, United States of America
| | - Brandan H. Tran
- Department of Chemistry, University of California, Irvine, California, 92697-2025, United States of America
| | - Sudipta Majumdar
- Department of Chemistry, University of California, Irvine, California, 92697-2025, United States of America
| | - Gregory A. Weiss
- Department of Chemistry, University of California, Irvine, California, 92697-2025, United States of America
- Department of Molecular Biology and Biochemistry, University of California, Irvine, California, 92697-3900, United States of America
- Department of Pharmaceutical Sciences, University of California, Irvine, California, 92697-3958, United States of America
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20
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Fülöp Z, Szemesi P, Bana P, Éles J, Greiner I. Evolution of flow-oriented design strategies in the continuous preparation of pharmaceuticals. REACT CHEM ENG 2020. [DOI: 10.1039/d0re00273a] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
This review focuses on the flow-oriented design (FOD) in the multi-step continuous-flow synthesis of active pharmaceutical ingredients.
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Affiliation(s)
- Zsolt Fülöp
- Department of Organic Chemistry and Technology
- Budapest University of Technology and Economics
- 1521 Budapest
- Hungary
| | - Péter Szemesi
- Department of Organic Chemistry and Technology
- Budapest University of Technology and Economics
- 1521 Budapest
- Hungary
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21
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Bloemendal VRLJ, Janssen MACH, van Hest JCM, Rutjes FPJT. Continuous one-flow multi-step synthesis of active pharmaceutical ingredients. REACT CHEM ENG 2020. [DOI: 10.1039/d0re00087f] [Citation(s) in RCA: 46] [Impact Index Per Article: 11.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
This review highlights a selection of multistep continuous flow (one-flow) processes leading to the synthesis of active pharmaceutical ingredients (APIs).
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Affiliation(s)
| | | | - Jan C. M. van Hest
- Bio-organic chemistry
- Eindhoven University of Technology
- 5600 MB Eindhoven
- The Netherlands
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22
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Tissot M, Jacq J, Pasau P. Stereospecific Amination of Mesylated Cyclobutanol in Continuous Flow. Org Process Res Dev 2019. [DOI: 10.1021/acs.oprd.9b00381] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Matthieu Tissot
- UCB Biopharma SPRL, Avenue de l’industrie, 1420 Braine l’Alleud, Belgium
| | - Jérôme Jacq
- UCB Biopharma SPRL, Avenue de l’industrie, 1420 Braine l’Alleud, Belgium
| | - Patrick Pasau
- UCB Biopharma SPRL, Avenue de l’industrie, 1420 Braine l’Alleud, Belgium
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23
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Brandão P, Pineiro M, Pinho e Melo TMVD. Flow Chemistry: Towards A More Sustainable Heterocyclic Synthesis. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901335] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Pedro Brandão
- CQC and Department of Chemistry; University of Coimbra; 3004-535 Coimbra Portugal
- Centro de Química de Évora; Institute for Research and Advanced Studies; University of Évora; 7000 Évora Portugal
| | - Marta Pineiro
- CQC and Department of Chemistry; University of Coimbra; 3004-535 Coimbra Portugal
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24
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Ahn GN, Yu T, Lee HJ, Gyak KW, Kang JH, You D, Kim DP. A numbering-up metal microreactor for the high-throughput production of a commercial drug by copper catalysis. LAB ON A CHIP 2019; 19:3535-3542. [PMID: 31555789 DOI: 10.1039/c9lc00764d] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Microreactors are emerging as an efficient, sustainable synthetic tool compared to conventional batch reactors. Here, we present a new numbering-up metal microreactor by integrating a flow distributor and a copper catalytic module for high productivity of a commercial synthetic drug. A flow distributor and an embedded baffle disc were manufactured by CNC machining and 3D printing of stainless steel (S/S), respectively, whereas a catalytic reaction module was composed of 25 copper coiled capillaries configured in parallel. Eventually, the numbering-up microreactor system assembled with functional modules showed uniform flow distribution and high mixing efficiency regardless of clogging, and achieved high-throughput synthesis of the drug "rufinamide", an anticonvulsant medicine, via a Cu(i)-catalyzed azide-alkyne cycloaddition reaction under optimized conditions.
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Affiliation(s)
- Gwang-Noh Ahn
- Center of Intelligent Microprocess for Pharmaceutical Synthesis, Department of Chemical Engineering, Pohang University of Science and Technology, Environ. Eng. Bldg., San 31, Hyoja-dong, Nam-gu, Pohang, South Korea.
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25
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Avula SK, Khan A, Halim SA, Al-Abri Z, Anwar MU, Al-Rawahi A, Csuk R, Al-Harrasi A. Synthesis of novel (R)-4-fluorophenyl-1H-1,2,3-triazoles: A new class of α-glucosidase inhibitors. Bioorg Chem 2019; 91:103182. [DOI: 10.1016/j.bioorg.2019.103182] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2019] [Revised: 07/04/2019] [Accepted: 08/01/2019] [Indexed: 01/19/2023]
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26
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Sharma M, Acharya RB, Kulkarni AA. Exploring the Steady Operation of a Continuous Pilot Plant for the Di‐Nitration Reaction. Chem Eng Technol 2019. [DOI: 10.1002/ceat.201900140] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Mrityunjay Sharma
- National Chemical LaboratoryChemical Engineering & Process Development Division Pashan 411008 Pune India
- Academy of Scientific and Innovative Research (AcSIR)CSIR-National Chemical Laboratory (NCL) campus, Pashan 411008 Pune India
| | - Roopashree B. Acharya
- National Chemical LaboratoryChemical Engineering & Process Development Division Pashan 411008 Pune India
| | - Amol A. Kulkarni
- National Chemical LaboratoryChemical Engineering & Process Development Division Pashan 411008 Pune India
- Academy of Scientific and Innovative Research (AcSIR)CSIR-National Chemical Laboratory (NCL) campus, Pashan 411008 Pune India
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27
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Santana HS, Palma MSA, Lopes MGM, Souza J, Lima GAS, Taranto OP, Silva JL. Microfluidic Devices and 3D Printing for Synthesis and Screening of Drugs and Tissue Engineering. Ind Eng Chem Res 2019. [DOI: 10.1021/acs.iecr.9b03787] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Harrson S. Santana
- School of Chemical Engineering, University of Campinas, 13083-852 Campinas, São Paulo, Brazil
| | - Mauri S. A. Palma
- Department of Biochemical and Pharmaceutical Technology, São Paulo University, 05508-000 São Paulo, São Paulo, Brazil
| | - Mariana G. M. Lopes
- School of Chemical Engineering, University of Campinas, 13083-852 Campinas, São Paulo, Brazil
| | - Johmar Souza
- School of Chemical Engineering, University of Campinas, 13083-852 Campinas, São Paulo, Brazil
| | - Giovanni A. S. Lima
- Institute of Environmental, Chemical, and Pharmaceutical Sciences Federal, University of São Paulo, 09972-270 Diadema, São Paulo, Brazil
| | - Osvaldir P. Taranto
- School of Chemical Engineering, University of Campinas, 13083-852 Campinas, São Paulo, Brazil
| | - João Lameu Silva
- Federal Institute of Education, Science, and Technology of South of Minas Gerais − IFSULDEMINAS, 37560-260 Pouso Alegre, Minas Gerais, Brazil
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28
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Abstract
A modular continuous flow synthesis of imatinib and analogues is reported. Structurally diverse imatinib analogues are rapidly generated using three readily available building blocks via a flow hydration/chemoselective C-N coupling sequence. The newly developed continuous flow hydration and amidation modules each exhibit a broad scope with good to excellent yields. Overall, the method described does not require solvent switches, in-line purifications, or packed-bed apparatuses due to the judicious manipulation of flow setups and solvent mixtures.
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Affiliation(s)
- Wai Chung Fu
- Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
| | - Timothy F Jamison
- Department of Chemistry , Massachusetts Institute of Technology , 77 Massachusetts Avenue , Cambridge , Massachusetts 02139 , United States
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29
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Sthalam VK, Singh AK, Pabbaraja S. An Integrated Continuous Flow Micro-Total Ultrafast Process System (μ-TUFPS) for the Synthesis of Celecoxib and Other Cyclooxygenase Inhibitors. Org Process Res Dev 2019. [DOI: 10.1021/acs.oprd.9b00212] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Vinay Kumar Sthalam
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-Human Resource Development Centre (CSIR-HRDC) Campus, Ghaziabad 201002, Uttar Pradesh, India
| | - Ajay K. Singh
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
| | - Srihari Pabbaraja
- Department of Organic Synthesis and Process Chemistry, CSIR-Indian Institute of Chemical Technology, Hyderabad 500007, India
- Academy of Scientific and Innovative Research (AcSIR), CSIR-Human Resource Development Centre (CSIR-HRDC) Campus, Ghaziabad 201002, Uttar Pradesh, India
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30
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Bogdan AR, Dombrowski AW. Emerging Trends in Flow Chemistry and Applications to the Pharmaceutical Industry. J Med Chem 2019; 62:6422-6468. [DOI: 10.1021/acs.jmedchem.8b01760] [Citation(s) in RCA: 110] [Impact Index Per Article: 22.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Andrew R. Bogdan
- Discovery Chemistry and Technology, AbbVie, Inc. 1 North Waukegan Road, North Chicago, Illinois 60064, United States
| | - Amanda W. Dombrowski
- Discovery Chemistry and Technology, AbbVie, Inc. 1 North Waukegan Road, North Chicago, Illinois 60064, United States
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31
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Jaman Z, Sobreira TJP, Mufti A, Ferreira CR, Cooks RG, Thompson DH. Rapid On-Demand Synthesis of Lomustine under Continuous Flow Conditions. Org Process Res Dev 2019. [DOI: 10.1021/acs.oprd.8b00387] [Citation(s) in RCA: 28] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Zinia Jaman
- Department of Chemistry, Purdue University, Bindley Bioscience Center, 1203 West State Street, West Lafayette, Indiana 47907, United States
| | - Tiago J. P. Sobreira
- Department of Chemistry, Purdue University, Bindley Bioscience Center, 1203 West State Street, West Lafayette, Indiana 47907, United States
| | - Ahmed Mufti
- School of Chemical Engineering, Purdue University, 480 West Stadium Avenue, West Lafayette, Indiana 47907, United States
| | - Christina R. Ferreira
- Department of Chemistry, Purdue University, Bindley Bioscience Center, 1203 West State Street, West Lafayette, Indiana 47907, United States
| | - R. Graham Cooks
- Department of Chemistry, Purdue University, Bindley Bioscience Center, 1203 West State Street, West Lafayette, Indiana 47907, United States
| | - David H. Thompson
- Department of Chemistry, Purdue University, Bindley Bioscience Center, 1203 West State Street, West Lafayette, Indiana 47907, United States
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32
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Mahajan B, Mujawar T, Ghosh S, Pabbaraja S, Singh AK. Micro-electro-flow reactor (μ-EFR) system for ultra-fast arene synthesis and manufacture of daclatasvir. Chem Commun (Camb) 2019; 55:11852-11855. [DOI: 10.1039/c9cc06127d] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Electro-micro flow reactor containing Pt@Ni@Cu anode materials for reductant free biaryl synthesis, further extended to daclatasvir synthesis.
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Affiliation(s)
- Bhushan Mahajan
- Division of Organic Synthesis and Process Chemistry
- CSIR-Indian Institute of Chemical Technology
- Hyderabad-500007
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Taufiqueahmed Mujawar
- Division of Organic Synthesis and Process Chemistry
- CSIR-Indian Institute of Chemical Technology
- Hyderabad-500007
- India
| | - Subhash Ghosh
- Division of Organic Synthesis and Process Chemistry
- CSIR-Indian Institute of Chemical Technology
- Hyderabad-500007
- India
| | - Srihari Pabbaraja
- Division of Organic Synthesis and Process Chemistry
- CSIR-Indian Institute of Chemical Technology
- Hyderabad-500007
- India
- Academy of Scientific and Innovative Research (AcSIR)
| | - Ajay K. Singh
- Division of Organic Synthesis and Process Chemistry
- CSIR-Indian Institute of Chemical Technology
- Hyderabad-500007
- India
- Academy of Scientific and Innovative Research (AcSIR)
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33
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Santoro S, Ferlin F, Ackermann L, Vaccaro L. C-H functionalization reactions under flow conditions. Chem Soc Rev 2019; 48:2767-2782. [PMID: 30942788 DOI: 10.1039/c8cs00211h] [Citation(s) in RCA: 67] [Impact Index Per Article: 13.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
C-H functionalization technologies have progressed enormously in the last decade as testified by the great number of publications that have appeared in the literature, which are receiving great attention from researchers from different areas of expertise. While most of the protocols reported realize the C-H functionalization processes under batch conditions, there is a growing interest in the development of continuous-flow procedures aiming at increasing the performances of established methodologies or the definition of otherwise unfeasible transformations. This review summarizes the application of flow technologies for the realization of C-H functionalization reactions. According to the type of flow reactors necessary, two main general approaches are possible for the application of flow techniques, namely the use of homogeneous or heterogeneous conditions. Each example is discussed and accompanied by the description of the main features and benefits of the use of flow compared to batch conditions.
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Affiliation(s)
- Stefano Santoro
- Laboratory of Green S.O.C., Dipartimento di Chimica Biologia e Biotecnologie, Università di Perugia, Via Elce di Sotto, 8 - 06123 Perugia, Italy.
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34
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Akwi FM, Watts P. Continuous flow chemistry: where are we now? Recent applications, challenges and limitations. Chem Commun (Camb) 2018; 54:13894-13928. [PMID: 30483683 DOI: 10.1039/c8cc07427e] [Citation(s) in RCA: 128] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A general outlook of the changing face of chemical synthesis is provided in this article through recent applications of continuous flow processing in both industry and academia. The benefits, major challenges and limitations associated with the use of this mode of processing are also given due attention as an attempt to put into perspective the current position of continuous flow processing, either as an alternative or potential combinatory technology for batch processing.
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Affiliation(s)
- Faith M Akwi
- Nelson Mandela University, University Way, Port Elizabeth, 6031, South Africa.
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35
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Avula SK, Khan A, Rehman NU, Anwar MU, Al-Abri Z, Wadood A, Riaz M, Csuk R, Al-Harrasi A. Synthesis of 1H-1,2,3-triazole derivatives as new α-glucosidase inhibitors and their molecular docking studies. Bioorg Chem 2018; 81:98-106. [DOI: 10.1016/j.bioorg.2018.08.008] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 07/28/2018] [Accepted: 08/06/2018] [Indexed: 10/28/2022]
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36
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Marion KC, Wooke Z, Pohl NLB. Synthesis of protected glucose derivatives from levoglucosan by development of common carbohydrate protecting group reactions under continuous flow conditions. Carbohydr Res 2018; 468:23-29. [PMID: 30121415 PMCID: PMC6615043 DOI: 10.1016/j.carres.2018.08.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/10/2018] [Revised: 08/03/2018] [Accepted: 08/03/2018] [Indexed: 12/22/2022]
Abstract
Common carbohydrate protecting group reactions under continuous flow processes are reported in the context of producing partially-protected glucose building blocks from levoglucosan. Benzyl ether protection was demonstrated without the use of NaH using barium oxide, which, however, pointed to the need for forms of this catalyst not as susceptible to close packing under flow. Acylation conditions were developed under continuous flow in acetonitrile and avoiding pyridine. Ring-opening the derivatized levoglucosan with propanethiol was also demonstrated producing S-alkyl 2,4-di-O-benzyl-glucopyranoside building block in 2 rather than 12 steps in increased overall yield.
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Affiliation(s)
- Keevan C Marion
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave, Bloomington, IN, 47405, United States
| | - Zachary Wooke
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave, Bloomington, IN, 47405, United States
| | - Nicola L B Pohl
- Department of Chemistry, Indiana University, 800 E. Kirkwood Ave, Bloomington, IN, 47405, United States.
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37
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Falcone CE, Jaman Z, Wleklinski M, Koswara A, Thompson DH, Cooks RG. Reaction screening and optimization of continuous-flow atropine synthesis by preparative electrospray mass spectrometry. Analyst 2018; 142:2836-2845. [PMID: 28703239 DOI: 10.1039/c7an00622e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Abstract
Preparative electrospray (ES) exploits the acceleration of reactions in charged microdroplets to perform a small scale chemical synthesis. In combination with on-line mass spectrometric (MS) analysis, it constitutes a rapid screening tool to select reagents to generate specific products. A successful reaction in preparative ES triggers a refined microfluidic reaction screening procedure which includes the optimization for stoichiometry, temperature and residence time. We apply this combined approach for refining a flow synthesis of atropine. A successful preparative ES pathway for the synthesis of the phenylacetyl ester intermediate, using tropine/HCl/phenylacetyl chloride, was optimized for solvent in both the preparative ES and microfluidics flow systems and a base screening was conducted by both methods to increase atropine yield, increase percentage conversion and reduce byproducts. In preparative ES, the first step yielded 55% conversion (judged using MS) to intermediate and the second step yielded 47% conversion to atropine. When combined in two discrete steps in continuous-flow microfluidics, a 44% conversion of the starting material and a 30% actual yield of atropine were achieved. When the reactions were continuously telescoped in a new form of preparative reactive extractive electrospray (EES), atropine was synthesized with a 24% conversion. The corresponding continuous-flow microfluidics experiment gave a 55% conversion with an average of 34% yield in 8 min residence time. This is the first in depth study to utilize telescoped preparative ES and the first use of dual ESI emitters for multistep synthesis.
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Affiliation(s)
- Caitlin E Falcone
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA.
| | - Zinia Jaman
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA.
| | - Michael Wleklinski
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA.
| | - Andy Koswara
- Chemical Engineering, Purdue University, 480 W Stadium Ave., West Lafayette, IN 47907, USA
| | - David H Thompson
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA.
| | - R Graham Cooks
- Department of Chemistry, Purdue University, 560 Oval Drive, West Lafayette, IN 47907, USA.
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38
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Sharma MK, Acharya RB, Shukla CA, Kulkarni AA. Assessing the possibilities of designing a unified multistep continuous flow synthesis platform. Beilstein J Org Chem 2018; 14:1917-1936. [PMID: 30112097 PMCID: PMC6071694 DOI: 10.3762/bjoc.14.166] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2018] [Accepted: 06/22/2018] [Indexed: 01/20/2023] Open
Abstract
The multistep flow synthesis of complex molecules has gained momentum over the last few years. A wide range of reaction types and conditions have been integrated seamlessly on a single platform including in-line separation as well as monitoring. Beyond merely getting considered as 'flow version' of conventional 'one-pot synthesis', multistep flow synthesis has become the next generation tool for creating libraries of new molecules. Here we give a more 'engineering' look at the possibility of developing a 'unified multistep flow synthesis platform'. A detailed analysis of various scenarios is presented considering 4 different classes of drugs already reported in the literature. The possible complexities that an automated and controlled platform needs to handle are also discussed in detail. Three different design approaches are proposed: (i) one molecule at a time, (ii) many molecules at a time and (iii) cybernetic approach. Each approach would lead to the effortless integration of different synthesis stages and also at different synthesis scales. While one may expect such a platform to operate like a 'driverless car' or a 'robo chemist' or a 'transformer', in reality, such an envisaged system would be much more complex than these examples.
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Affiliation(s)
- Mrityunjay K Sharma
- Academy of Scientific and Innovative Research (AcSIR), CSIR-National Chemical Laboratory (NCL) Campus, Pune 411008, India
- Chem. Eng. & Proc. Dev. Div., CSIR-National Chemical Laboratory, Dr. Homi Bhaba Road, Pashan, Pune 411008, India
| | - Roopashri B Acharya
- Chem. Eng. & Proc. Dev. Div., CSIR-National Chemical Laboratory, Dr. Homi Bhaba Road, Pashan, Pune 411008, India
| | - Chinmay A Shukla
- Academy of Scientific and Innovative Research (AcSIR), CSIR-National Chemical Laboratory (NCL) Campus, Pune 411008, India
- Chem. Eng. & Proc. Dev. Div., CSIR-National Chemical Laboratory, Dr. Homi Bhaba Road, Pashan, Pune 411008, India
| | - Amol A Kulkarni
- Academy of Scientific and Innovative Research (AcSIR), CSIR-National Chemical Laboratory (NCL) Campus, Pune 411008, India
- Chem. Eng. & Proc. Dev. Div., CSIR-National Chemical Laboratory, Dr. Homi Bhaba Road, Pashan, Pune 411008, India
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39
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Gérardy R, Emmanuel N, Toupy T, Kassin VE, Tshibalonza NN, Schmitz M, Monbaliu JCM. Continuous Flow Organic Chemistry: Successes and Pitfalls at the Interface with Current Societal Challenges. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800149] [Citation(s) in RCA: 144] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Romaric Gérardy
- Center for Integrated Technology and Organic Synthesis; Department of Chemistry; Research Unit MolSys; University of Liège; Quartier Agora, Allée du six Aout, 13 4000 Liège (Sart Tilman) Belgium
| | - Noémie Emmanuel
- Center for Integrated Technology and Organic Synthesis; Department of Chemistry; Research Unit MolSys; University of Liège; Quartier Agora, Allée du six Aout, 13 4000 Liège (Sart Tilman) Belgium
| | - Thomas Toupy
- Center for Integrated Technology and Organic Synthesis; Department of Chemistry; Research Unit MolSys; University of Liège; Quartier Agora, Allée du six Aout, 13 4000 Liège (Sart Tilman) Belgium
| | - Victor-Emmanuel Kassin
- Center for Integrated Technology and Organic Synthesis; Department of Chemistry; Research Unit MolSys; University of Liège; Quartier Agora, Allée du six Aout, 13 4000 Liège (Sart Tilman) Belgium
| | - Nelly Ntumba Tshibalonza
- Center for Integrated Technology and Organic Synthesis; Department of Chemistry; Research Unit MolSys; University of Liège; Quartier Agora, Allée du six Aout, 13 4000 Liège (Sart Tilman) Belgium
| | - Michaël Schmitz
- Center for Integrated Technology and Organic Synthesis; Department of Chemistry; Research Unit MolSys; University of Liège; Quartier Agora, Allée du six Aout, 13 4000 Liège (Sart Tilman) Belgium
| | - Jean-Christophe M. Monbaliu
- Center for Integrated Technology and Organic Synthesis; Department of Chemistry; Research Unit MolSys; University of Liège; Quartier Agora, Allée du six Aout, 13 4000 Liège (Sart Tilman) Belgium
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40
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Aguirre-De Paz JG, González-Calderón D, Fuentes-Benítes A, González-Romero C. Exploring azide-enolate cycloaddition in the synthesis of novel Rufinamide analogs. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.03.075] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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41
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Padmaja RD, Chanda K. A Short Review on Synthetic Advances toward the Synthesis of Rufinamide, an Antiepileptic Drug. Org Process Res Dev 2018. [DOI: 10.1021/acs.oprd.7b00373] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- R. D. Padmaja
- Department of Chemistry, School of Advanced Sciences, VIT University, Vellore-632014, India
| | - Kaushik Chanda
- Department of Chemistry, School of Advanced Sciences, VIT University, Vellore-632014, India
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Abstract
Organic chemistry is continually evolving to improve the syntheses of value added and bioactive compounds. Through this progression, a concomitant advancement in laboratory technology has occurred. Many researchers now choose to mediate transformations in continuous-flow systems given the many benefits over round bottom flasks. Furthermore, reaction scale up is often less problematic as this is addressed at the inception of the science. Although single-step transformations in continuous-flow systems are common, multi-step transformations are more valuable. In these systems, molecular complexity is accrued through sequential transformations to a mobile scaffold, much like an in vitro version of Nature's polyketide synthases. Utilizing this methodology, multi-step continuous-flow systems have improved the syntheses of active pharmaceutical ingredients (APIs), natural products, and commodity chemicals. This Review details these advancements while highlighting the rapid progress, benefits, and diversification of this expanding field.
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Affiliation(s)
- Joshua Britton
- School of Chemical and Physical Sciences, Flinders University, Bedford Park, South Australia 5042, Australia.
| | - Colin L Raston
- School of Chemical and Physical Sciences, Flinders University, Bedford Park, South Australia 5042, Australia.
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Diab S, Gerogiorgis DI. Process modelling, simulation and technoeconomic evaluation of crystallisation antisolvents for the continuous pharmaceutical manufacturing of rufinamide. Comput Chem Eng 2018. [DOI: 10.1016/j.compchemeng.2017.12.014] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Zhang P, Weeranoppanant N, Thomas DA, Tahara K, Stelzer T, Russell MG, O'Mahony M, Myerson AS, Lin H, Kelly LP, Jensen KF, Jamison TF, Dai C, Cui Y, Briggs N, Beingessner RL, Adamo A. Advanced Continuous Flow Platform for On-Demand Pharmaceutical Manufacturing. Chemistry 2018; 24:2776-2784. [PMID: 29385292 DOI: 10.1002/chem.201706004] [Citation(s) in RCA: 52] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Indexed: 12/14/2022]
Abstract
As a demonstration of an alternative to the challenges faced with batch pharmaceutical manufacturing including the large production footprint and lengthy time-scale, we previously reported a refrigerator-sized continuous flow system for the on-demand production of essential medicines. Building on this technology, herein we report a second-generation, reconfigurable and 25 % smaller (by volume) continuous flow pharmaceutical manufacturing platform featuring advances in reaction and purification equipment. Consisting of two compact [0.7 (L)×0.5 (D)×1.3 m (H)] stand-alone units for synthesis and purification/formulation processes, the capabilities of this automated system are demonstrated with the synthesis of nicardipine hydrochloride and the production of concentrated liquid doses of ciprofloxacin hydrochloride, neostigmine methylsulfate and rufinamide that meet US Pharmacopeia standards.
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Affiliation(s)
- Ping Zhang
- Novartis Institute of Biomedical Research, 250 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Nopphon Weeranoppanant
- Department of Chemical Engineering, Faculty of Engineering, Burapha University, 169 Long-Hard Bangsaen Road, Chonburi, 20131, Thailand
| | - Dale A Thomas
- Department of Chemical Engineering or Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Kohei Tahara
- Laboratory of Pharmaceutical Engineering, Gifu Pharmaceutical University, 1-25-4 Daigaku-Nishi, Gifu, 501-1196, Japan
| | - Torsten Stelzer
- Department of Pharmaceutical Sciences, University of Puerto Rico, Medical Sciences Campus, San Juan, PR, 00936, USA
| | - Mary Grace Russell
- Department of Chemical Engineering or Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Marcus O'Mahony
- Pharmaceutical & Preclinical Sciences, Vertex Pharmaceuticals Inc., 50 Northern Avenue, Boston, MA, 02210, USA
| | - Allan S Myerson
- Department of Chemical Engineering or Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Hongkun Lin
- Department of Chemical Engineering or Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Liam P Kelly
- Department of Chemical Engineering or Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Klavs F Jensen
- Department of Chemical Engineering or Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Timothy F Jamison
- Department of Chemical Engineering or Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Chunhui Dai
- Department of Chemical Engineering or Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Yuqing Cui
- Department of Chemical Engineering or Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Naomi Briggs
- Department of Chemical Engineering or Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Rachel L Beingessner
- Department of Chemical Engineering or Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
| | - Andrea Adamo
- Department of Chemical Engineering or Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA, 02139, USA
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45
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Yasukouchi H, Nishiyama A, Mitsuda M. Safe and Efficient Phosgenation Reactions in a Continuous Flow Reactor. Org Process Res Dev 2018. [DOI: 10.1021/acs.oprd.7b00353] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Hiroaki Yasukouchi
- Pharma Research Group, Pharma & Supplemental Nutrition Solutions Vehicle, Kaneka Corporation, 1-8, Miyamae-cho, Takasago-cho, Takasago, Hyogo 676-8688, Japan
| | - Akira Nishiyama
- Pharma Research Group, Pharma & Supplemental Nutrition Solutions Vehicle, Kaneka Corporation, 1-8, Miyamae-cho, Takasago-cho, Takasago, Hyogo 676-8688, Japan
| | - Masaru Mitsuda
- Pharma Research Group, Pharma & Supplemental Nutrition Solutions Vehicle, Kaneka Corporation, 1-8, Miyamae-cho, Takasago-cho, Takasago, Hyogo 676-8688, Japan
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46
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Lee HJ, Kim H, Yoshida JI, Kim DP. Control of tandem isomerizations: flow-assisted reactions of o-lithiated aryl benzyl ethers. Chem Commun (Camb) 2018; 54:547-550. [DOI: 10.1039/c7cc08460a] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
We report a flow microreactor platform for controlling tandem isomerizations of o-lithiated aryl benzyl ethers based on precise residence time control.
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Affiliation(s)
- Hyune-Jea Lee
- Centre for Intelligent Microprocess of Pharmaceutical Synthesis
- Department of Chemical Engineering
- POSTECH (Pohang University of Science and Technology)
- Pohang
- South Korea
| | - Heejin Kim
- Department of Synthetic and Biological Chemistry Graduate School of Engineering
- Kyoto University
- Kyoto
- Japan
| | - Jun-ichi Yoshida
- Department of Synthetic and Biological Chemistry Graduate School of Engineering
- Kyoto University
- Kyoto
- Japan
| | - Dong-Pyo Kim
- Centre for Intelligent Microprocess of Pharmaceutical Synthesis
- Department of Chemical Engineering
- POSTECH (Pohang University of Science and Technology)
- Pohang
- South Korea
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47
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Bédard AC, Longstreet AR, Britton J, Wang Y, Moriguchi H, Hicklin RW, Green WH, Jamison TF. Minimizing E-factor in the continuous-flow synthesis of diazepam and atropine. Bioorg Med Chem 2017; 25:6233-6241. [DOI: 10.1016/j.bmc.2017.02.002] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2016] [Revised: 01/27/2017] [Accepted: 02/01/2017] [Indexed: 10/20/2022]
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48
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Britton J, Jamison TF. The assembly and use of continuous flow systems for chemical synthesis. Nat Protoc 2017; 12:2423-2446. [PMID: 29072707 DOI: 10.1038/nprot.2017.102] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 10/20/2017] [Indexed: 01/30/2023]
Abstract
The adoption of and opportunities in continuous flow synthesis ('flow chemistry') have increased significantly over the past several years. Continuous flow systems provide improved reaction safety and accelerated reaction kinetics, and have synthesised several active pharmaceutical ingredients in automated reconfigurable systems. Although continuous flow platforms are commercially available, systems constructed 'in-lab' provide researchers with a flexible, versatile, and cost-effective alternative. Herein, we describe the assembly and use of a modular continuous flow apparatus from readily available and affordable parts in as little as 30 min. Once assembled, the synthesis of a sulfonamide by reacting 4-chlorobenzenesulfonyl chloride with dibenzylamine in a single reactor coil with an in-line quench is presented. This example reaction offers the opportunity to learn several important skills including reactor construction, charging of a back-pressure regulator, assembly of stainless-steel syringes, assembly of a continuous flow system with multiple junctions, and yield determination. From our extensive experience of single-step and multistep continuous flow synthesis, we also describe solutions to commonly encountered technical problems such as precipitation of solids ('clogging') and reactor failure. Following this protocol, a nonspecialist can assemble a continuous flow system from reactor coils, syringes, pumps, in-line liquid-liquid separators, drying columns, back-pressure regulators, static mixers, and packed-bed reactors.
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Affiliation(s)
- Joshua Britton
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
| | - Timothy F Jamison
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts, USA
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49
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Karlsson S, Cook C, Emtenäs H, Fan K, Gillespie P, Mohamed M. Development of a Safe Continuous Manufacturing Route to 2-(4-Isopropyl-1H-1,2,3-triazol-1-yl)acetic Acid. Org Process Res Dev 2017. [DOI: 10.1021/acs.oprd.7b00259] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Staffan Karlsson
- Innovative Medicines, Pharmaceutical Sciences, Early Chemical Development, AstraZeneca R&D Gothenburg, SE-431 83, Mölndal, Sweden
| | - Calum Cook
- Innovative Medicines, Pharmaceutical Sciences, Early Chemical Development, AstraZeneca R&D Macclesfield, Macclesfield SK10 2NX, United Kingdom
| | - Hans Emtenäs
- Innovative Medicines, Pharmaceutical Sciences, Early Chemical Development, AstraZeneca R&D Gothenburg, SE-431 83, Mölndal, Sweden
| | - Kenny Fan
- Global Medicines Development, AstraZeneca R&D Macclesfield, Macclesfield SK10 2NA, United Kingdom
| | - Paul Gillespie
- Global Medicines Development, AstraZeneca R&D Macclesfield, Macclesfield SK10 2NA, United Kingdom
| | - Mubina Mohamed
- Global Medicines Development, AstraZeneca R&D Macclesfield, Macclesfield SK10 2NA, United Kingdom
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50
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Britton J, Jamison TF. A Unified Continuous Flow Assembly-Line Synthesis of Highly Substituted Pyrazoles and Pyrazolines. Angew Chem Int Ed Engl 2017; 56:8823-8827. [PMID: 28544160 PMCID: PMC6990874 DOI: 10.1002/anie.201704529] [Citation(s) in RCA: 108] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Indexed: 12/02/2022]
Abstract
A rapid and modular continuous flow synthesis of highly functionalized fluorinated pyrazoles and pyrazolines has been developed. Flowing fluorinated amines through sequential reactor coils mediates diazoalkane formation and [3+2] cycloaddition to generate more than 30 azoles in a telescoped fashion. Pyrazole cores are then sequentially modified through additional reactor modules performing N-alkylation and arylation, deprotection, and amidation to install broad molecular diversity in short order. Continuous flow synthesis enables the safe handling of diazoalkanes at elevated temperatures, and the use of aryl alkyne dipolarphiles under catalyst free conditions. This assembly line synthesis provides a flexible approach for the synthesis of agrochemicals and pharmaceuticals, as demonstrated by a four-step, telescoped synthesis of measles therapeutic, AS-136A, in a total residence time of 31.7 min (1.76 g h-1).
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Affiliation(s)
- Joshua Britton
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA, 02139, USA
| | - Timothy F Jamison
- Department of Chemistry, Massachusetts Institute of Technology, 77 Massachusetts Ave., Cambridge, MA, 02139, USA
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