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Xu A, Ren L, Huang J, Zhu Y, Wang G, Li C, Sun Y, Song L, You H, Chen FE. Highly enantioselective synthesis of both enantiomers of tetrahydroquinoxaline derivatives via Ir-catalyzed asymmetric hydrogenation. Chem Sci 2024:d4sc04222k. [PMID: 39246375 PMCID: PMC11376201 DOI: 10.1039/d4sc04222k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/26/2024] [Accepted: 08/20/2024] [Indexed: 09/10/2024] Open
Abstract
A novel Ir-catalyzed asymmetric hydrogenation protocol for the synthesis of chiral tetrahydroquinoxaline (THQ) derivatives has been developed. By simply adjusting the reaction solvent, both enantiomers of mono-substituted chiral THQs could be selectively obtained in high yields with excellent enantioselectivities (toluene/dioxane: up to 93% yield and 98% ee (R); EtOH: up to 83% yield and 93% ee (S)). For 2,3-disubstituted chiral THQs, the cis-hydrogenation products were obtained with up to 95% yield, 20 : 1 dr, and 94% ee. Remarkably, this methodology was also applicable under continuous flow conditions, yielding gram-scale products with comparable yields and enantioselectivities (dioxane: 91% yield and 93% ee (R); EtOH: 90% yield and 87% ee (S)). Unlike previously reported Ir-catalyzed asymmetric hydrogenation protocols, this system exhibited a significant improvement as it required no additional additives. Furthermore, comprehensive mechanistic studies including deuterium-labeling experiments, control experiments, kinetic studies, and density functional theory (DFT) calculations were conducted to reveal the underlying mechanism of enantioselectivities for both enantiomers.
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Affiliation(s)
- Ana Xu
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
| | - Lanxing Ren
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
- School of Chemistry and Chemical Engineering, Hunan Province Key Laboratory for the Design and Application of Actinide Complexes, University of South China Hengyang City Hunan Province 421001 P.R. China
| | - Junrong Huang
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
| | - Yuxiang Zhu
- School of Pharmaceutical Sciences (Shenzhen), Shenzhen Campus of Sun Yat-sen University Shenzhen 518107 China
| | - Gang Wang
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
| | - Chaoyi Li
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
| | - Yongqiang Sun
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
| | - Lijuan Song
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
| | - Hengzhi You
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
- Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
| | - Fen-Er Chen
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
- Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
- Department of Chemistry, Engineering Center of Catalysis and Synthesis for Chiral Molecules, Fudan University Shanghai 200433 China
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Guan F, Wen J. Flash Organometallic Catalysis Uncovered by Continuous Microfluidic Devices. Chempluschem 2024; 89:e202300646. [PMID: 38291001 DOI: 10.1002/cplu.202300646] [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: 11/08/2023] [Revised: 01/23/2024] [Accepted: 01/25/2024] [Indexed: 02/01/2024]
Abstract
The flash organometallic catalysis is a new concept that refers to the study of fast and controlled organometallic catalytic reactions by using microfluidic devices. Flash reactions' kinetics (ms-s scale) is often ignored due to the lack of proper research tool in organometallic chemistry. The development of microfluidic systems offers the opportunity to discover under-studied mechanisms and new reactions. In this concept, the basic theory of kinetic measurement in a microreactor is briefly reviewed and then two examples on studying flash organometallic catalytic transformation are introduced. One example is the discovery of a highly active palladium catalytic species for Suzuki Coupling and the other example is the study of a neglected isomerization catalytic cycle with a time scale of seconds before isomerization-hydroformylation by customized microfluidic devices. The last part is summary and prospect of this new area. Customizing a microfluidic device with good engineering design for a target reaction supports flash reactions' kinetic experimentation and could become a general strategy in chemistry lab.
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Affiliation(s)
- Fanfu Guan
- Department of Chemical Process R&D, Lianyungang Institute of Research, Jiangsu Hengrui Pharmaceuticals Co., Ltd., 7 Kunlunshan Road, Lianyungang, 222000, China
| | - Jialin Wen
- Department of Chemical Process R&D, Lianyungang Institute of Research, Jiangsu Hengrui Pharmaceuticals Co., Ltd., 7 Kunlunshan Road, Lianyungang, 222000, China
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Xu A, Li C, Huang J, Pang H, Zhao C, Song L, You H, Zhang X, Chen FE. Highly enantioselective synthesis of both tetrahydroquinoxalines and dihydroquinoxalinones via Rh-thiourea catalyzed asymmetric hydrogenation. Chem Sci 2023; 14:9024-9032. [PMID: 37655018 PMCID: PMC10466277 DOI: 10.1039/d3sc00803g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/13/2023] [Accepted: 07/03/2023] [Indexed: 09/02/2023] Open
Abstract
Chiral tetrahydroquinoxalines and dihydroquinoxalinones represent the core structure of many bioactive molecules. Herein, a simple and efficient Rh-thiourea-catalyzed asymmetric hydrogenation for enantiopure tetrahydroquinoxalines and dihydroquinoxalinones was developed under 1 MPa H2 pressure at room temperature. The reaction was magnified to the gram scale furnishing the desired products with undamaged yield and enantioselectivity. Application of this methodology was also conducted successfully under continuous flow conditions. In addition, 1H NMR experiments revealed that the introduction of a strong Brønsted acid, HCl, not only activated the substrate but also established anion binding between the substrate and the ligand. More importantly, the chloride ion facilitated heterolytic cleavage of dihydrogen to regenerate the active dihydride species and HCl, which was computed to be the rate-determining step. Further deuterium labeling experiments and density functional theory (DFT) calculations demonstrated that this reaction underwent a plausible outer-sphere mechanism in this new catalytic transformation.
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Affiliation(s)
- Ana Xu
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
| | - Chaoyi Li
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
| | - Junrong Huang
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
| | - Heng Pang
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
| | - Chengyao Zhao
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
| | - Lijuan Song
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
| | - Hengzhi You
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
- Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
| | - Xumu Zhang
- Department of Chemistry, Shenzhen Grubbs Institute, Southern University of Science and Technology Shenzhen 518055 China
| | - Fen-Er Chen
- School of Science, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
- Green Pharmaceutical Engineering Research Center, Harbin Institute of Technology (Shenzhen) Taoyuan Street, Nanshan District Shenzhen 518055 China
- Engineering Center of Catalysis and Synthesis for Chiral Molecules, Department of Chemistry, Fudan University Shanghai 200433 China
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Effects of two-phase periodic velocity on droplet coalescence inside microchannels. J Flow Chem 2023. [DOI: 10.1007/s41981-023-00258-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/10/2023]
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Ralbovsky NM, Smith JP. Process analytical technology and its recent applications for asymmetric synthesis. Talanta 2022; 252:123787. [DOI: 10.1016/j.talanta.2022.123787] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/10/2022] [Accepted: 07/25/2022] [Indexed: 11/27/2022]
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Burange AS, Osman SM, Luque R. Understanding flow chemistry for the production of active pharmaceutical ingredients. iScience 2022; 25:103892. [PMID: 35243250 PMCID: PMC8867129 DOI: 10.1016/j.isci.2022.103892] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Multi-step organic syntheses of various drugs, active pharmaceutical ingredients, and other pharmaceutically and agriculturally important compounds have already been reported using flow synthesis. Compared to batch, hazardous and reactive reagents can be handled safely in flow. This review discusses the pros and cons of flow chemistry in today’s scenario and recent developments in flow devices. The review majorly emphasizes on the recent developments in the flow synthesis of pharmaceutically important products in last five years including flibanserin, imatinib, buclizine, cinnarizine, cyclizine, meclizine, ribociclib, celecoxib, SC-560 and mavacoxib, efavirenz, fluconazole, melitracen HCl, rasagiline, tamsulosin, valsartan, and hydroxychloroquine. Critical steps and new development in the flow synthesis of selected compounds are also discussed.
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Affiliation(s)
- Anand S. Burange
- Department of Chemistry, Wilson College, Chowpatty, Mumbai 400007, India
- Corresponding author
| | - Sameh M. Osman
- Chemistry Department, College of Science, King Saud University, P.O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Rafael Luque
- Departamento de Quimica Organica, Universidad de Cordoba, Edificio Marie Curie (C-3), Ctra Nnal IV-A, Km 396, E14014 Cordoba, Spain
- Peoples Friendship University of Russia (RUDN University), 6 Miklukho Maklaya str., 107198 Moscow, Russian Federation
- Corresponding author
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Li R, Wang X, Peng Y, Xu P, Zhu H, Li Z, Sun X. Unique gold nanocrystals with chiral morphology, chiral ligand and more exposed high-index facet as electrocatalyst for oxidation of glucose enantiomers with ultrahigh enantioselectivity and catalytic activity. Catal Sci Technol 2022. [DOI: 10.1039/d1cy01764k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Poor enantioselectivity and catalytic activity of chiral metal nanocrystals limit their wide applications in chiral synthesis. The study reports one strategy for synthesis of chiral gold nanocrystals via reduction of...
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