1
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Roy S, Panja S, Sahoo SR, Chatterjee S, Maiti D. Enroute sustainability: metal free C-H bond functionalisation. Chem Soc Rev 2023; 52:2391-2479. [PMID: 36924227 DOI: 10.1039/d0cs01466d] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/18/2023]
Abstract
The term "C-H functionalisation" incorporates C-H activation followed by its transformation. In a single line, this can be defined as the conversion of carbon-hydrogen bonds into carbon-carbon or carbon-heteroatom bonds. The catalytic functionalisation of C-H bonds using transition metals has emerged as an atom-economical technique to engender new bonds without activated precursors which can be considered as a major drawback while attempting large-scale synthesis. Replacing the transition-metal-catalysed approach with a metal-free strategy significantly offers an alternative route that is not only inexpensive but also environmentally benign to functionalize C-H bonds. Recently metal free synthetic approaches have been flourishing to functionalize C-H bonds, motivated by the search for greener, cost-effective, and non-toxic catalysts. In this review, we will highlight the comprehensive and up-to-date discussion on recent examples of ground-breaking research on green and sustainable metal-free C-H bond functionalisation.
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Affiliation(s)
- Sayan Roy
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
| | - Subir Panja
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
| | - Sumeet Ranjan Sahoo
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
| | - Sagnik Chatterjee
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India.
| | - Debabrata Maiti
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai-400076, India. .,Department of Interdisciplinary Program in Climate Studies, Indian Institute of Technology Bombay, Powai, Mumbai, 400076, India
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2
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Facile synthesis of 1-substituted 4-H phthalazine, a versatile scaffold for chemically diverse phthalazines. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132920] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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3
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Ham WS, Choi H, Zhang J, Kim D, Chang S. C2-Selective, Functional-Group-Divergent Amination of Pyrimidines by Enthalpy-Controlled Nucleophilic Functionalization. J Am Chem Soc 2022; 144:2885-2892. [PMID: 35138104 DOI: 10.1021/jacs.1c13373] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Synthesis of heteroaryl amines has been an important topic in organic chemistry because of their importance in small-molecule discovery. In particular, 2-aminopyrimidines represent a highly privileged structural motif that is prevalent in bioactive molecules, but a general strategy to introduce the pyrimidine C2-N bonds via direct functionalization is elusive. Here we describe a synthetic platform for site-selective C-H functionalization that affords pyrimidinyl iminium salt intermediates, which then can be transformed into various amine products in situ. Mechanism-based reagent design allowed for the C2-selective amination of pyrimidines, opening the new scope of site-selective heteroaryl C-H functionalization. Our method is compatible with a broad range of pyrimidines with sensitive functional groups and can access complex aminopyrimidines with high selectivity.
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Affiliation(s)
- Won Seok Ham
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea.,Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
| | - Hoonchul Choi
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea.,Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
| | - Jianbo Zhang
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea.,Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
| | - Dongwook Kim
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea.,Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
| | - Sukbok Chang
- Center for Catalytic Hydrocarbon Functionalizations, Institute for Basic Science (IBS), Daejeon 34141, South Korea.,Department of Chemistry, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, South Korea
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4
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Lipshultz JM, Radosevich AT. Uniting Amide Synthesis and Activation by P III/P V-Catalyzed Serial Condensation: Three-Component Assembly of 2-Amidopyridines. J Am Chem Soc 2021; 143:14487-14494. [PMID: 34478308 DOI: 10.1021/jacs.1c07608] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
An organophosphorus (PIII/PV redox) catalyzed method for the three-component condensation of amines, carboxylic acids, and pyridine N-oxides to generate 2-amidopyridines via serial dehydration is reported. Whereas amide synthesis and functionalization usually occur under divergent reaction conditions, here a phosphetane catalyst (together with a mild bromenium oxidant and terminal hydrosilane reductant) is shown to drive both steps chemoselectively in an auto-tandem catalytic cascade. The ability to both prepare and functionalize amides under the action of a single organocatalytic reactive intermediate enables new possibilities for the efficient and modular preparation of medicinal targets.
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Affiliation(s)
- Jeffrey M Lipshultz
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
| | - Alexander T Radosevich
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, United States
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5
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Kaur R, Mandal S, Banerjee D, Kumar Yadav A. Transition Metal Free
α
−C−H Functionalization of Six Membered Heteroaromatic‐
N
‐Oxides. ChemistrySelect 2021. [DOI: 10.1002/slct.202100319] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Ramandeep Kaur
- University Institute of Pharmaceutical Sciences Panjab University Chandigarh 160014 India
| | - Sudip Mandal
- Sudip Mandal Centre of Biomedical Research (CBMR) Lucknow India
| | - Debolina Banerjee
- University Institute of Pharmaceutical Sciences Panjab University Chandigarh 160014 India
| | - Ashok Kumar Yadav
- University Institute of Pharmaceutical Sciences Panjab University Chandigarh 160014 India
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6
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Sontakke GS, Shukla RK, Volla CMR. Deoxygenative C2-heteroarylation of quinoline N-oxides: facile access to α-triazolylquinolines. Beilstein J Org Chem 2021; 17:485-493. [PMID: 33727971 PMCID: PMC7934756 DOI: 10.3762/bjoc.17.42] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2020] [Accepted: 01/30/2021] [Indexed: 12/24/2022] Open
Abstract
A metal- and additive-free, highly efficient, step-economical deoxygenative C2-heteroarylation of quinolines and isoquinolines was achieved from readily available N-oxides and N-sulfonyl-1,2,3-triazoles. A variety of α-triazolylquinoline derivatives were synthesized with good regioselectivity and in excellent yields under mild reaction conditions. Further, a gram-scale and one-pot synthesis illustrated the efficacy and simplicity of the developed protocol. The current transformation was also found to be compatible for the late-stage modification of natural products.
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Affiliation(s)
- Geetanjali S Sontakke
- Department of Chemistry, Indian Institute of Technology Bombay, Powai-400076, Mumbai, India
| | - Rahul K Shukla
- Department of Chemistry, Indian Institute of Technology Bombay, Powai-400076, Mumbai, India
| | - Chandra M R Volla
- Department of Chemistry, Indian Institute of Technology Bombay, Powai-400076, Mumbai, India
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7
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Recent Advances in the Synthesis of C2‐Functionalized Pyridines and Quinolines Using
N
‐Oxide Chemistry. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000910] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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8
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Kutasevich AV, Perevalov VP, Mityanov VS. Recent Progress in Non‐Catalytic C–H Functionalization of Heterocyclic
N
‐Oxides. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001115] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Anton V. Kutasevich
- Department of Fine Organic Synthesis and Chemistry of Dyes Mendeleev University of Chemical Technology Miusskaya Sq., 9 125047 Moscow Russian Federation
| | - Valery P. Perevalov
- Department of Fine Organic Synthesis and Chemistry of Dyes Mendeleev University of Chemical Technology Miusskaya Sq., 9 125047 Moscow Russian Federation
| | - Vitaly S. Mityanov
- Department of Fine Organic Synthesis and Chemistry of Dyes Mendeleev University of Chemical Technology Miusskaya Sq., 9 125047 Moscow Russian Federation
- N.D. Zelinsky Institute of Organic Chemistry Russian Academy of Sciences Leninsky Pr., 47 119991 Moscow Russian Federation
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9
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Baykov SV, Boyarskiy VP. Metal-Free Functionalization of Azine N-Oxides with Electrophilic Reagents. Chem Heterocycl Compd (N Y) 2020. [DOI: 10.1007/s10593-020-02737-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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10
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Yuan JW, Chen Q, Li C, Zhu JL, Yang LR, Zhang SR, Mao P, Xiao YM, Qu LB. Silver-catalyzed direct C-H oxidative carbamoylation of quinolines with oxamic acids. Org Biomol Chem 2020; 18:2747-2757. [PMID: 32227021 DOI: 10.1039/d0ob00358a] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A silver-catalyzed efficient and direct C-H carbamoylation of quinolines with oxamic acids to access carbamoylated quinolines has been developed through oxidative decarboxylation reaction. The reaction proceeds smoothly over a broad range of substrates with excellent functional group tolerance and excellent yields under mild conditions.
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Affiliation(s)
- Jin-Wei Yuan
- School of Chemistry & Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medicinal Chemistry of Henan Province, Zhengzhou 450001, China.
| | - Qian Chen
- School of Chemistry & Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medicinal Chemistry of Henan Province, Zhengzhou 450001, China.
| | - Chuang Li
- School of Chemistry & Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medicinal Chemistry of Henan Province, Zhengzhou 450001, China.
| | - Jun-Liang Zhu
- School of Chemistry & Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medicinal Chemistry of Henan Province, Zhengzhou 450001, China.
| | - Liang-Ru Yang
- School of Chemistry & Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medicinal Chemistry of Henan Province, Zhengzhou 450001, China.
| | - Shou-Ren Zhang
- Henan Key Laboratory of Nanocomposites and Applications; Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou 450006, China
| | - Pu Mao
- School of Chemistry & Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medicinal Chemistry of Henan Province, Zhengzhou 450001, China.
| | - Yong-Mei Xiao
- School of Chemistry & Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medicinal Chemistry of Henan Province, Zhengzhou 450001, China.
| | - Ling-Bo Qu
- College of Chemistry, Zhengzhou University, Zhengzhou 450001, China
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11
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Yuan JW, Zhu JL, Zhu HL, Peng F, Yang LY, Mao P, Zhang SR, Li YC, Qu LB. Transition-metal free direct C–H functionalization of quinoxalin-2(1H)-ones with oxamic acids leading to 3-carbamoyl quinoxalin-2(1H)-ones. Org Chem Front 2020. [DOI: 10.1039/c9qo01322a] [Citation(s) in RCA: 33] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A practical transition-metal free decarboxylative coupling reaction of oxamic acids with quinoxalin-2(1H)-ones has been developed under mild conditions.
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Affiliation(s)
- Jin-Wei Yuan
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Academician Workstation for Natural Medicinal Chemistry of Henan Province
- Zhengzhou 450001
- China
| | - Jun-Liang Zhu
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Academician Workstation for Natural Medicinal Chemistry of Henan Province
- Zhengzhou 450001
- China
| | - Hu-Lin Zhu
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Academician Workstation for Natural Medicinal Chemistry of Henan Province
- Zhengzhou 450001
- China
| | - Fang Peng
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Academician Workstation for Natural Medicinal Chemistry of Henan Province
- Zhengzhou 450001
- China
| | - Liang-Yu Yang
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Academician Workstation for Natural Medicinal Chemistry of Henan Province
- Zhengzhou 450001
- China
| | - Pu Mao
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Academician Workstation for Natural Medicinal Chemistry of Henan Province
- Zhengzhou 450001
- China
| | - Shou-Ren Zhang
- Henan Key Laboratory of Nanocomposites and Applications
- Institute of Nanostructured Functional Materials
- Huanghe Science and Technology College
- Zhengzhou 450006
- China
| | - Yan-Chun Li
- Henan Key Laboratory of Nanocomposites and Applications
- Institute of Nanostructured Functional Materials
- Huanghe Science and Technology College
- Zhengzhou 450006
- China
| | - Ling-Bo Qu
- College of Chemistry
- Zhengzhou University
- Zhengzhou 450001
- China
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12
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Ritu, Sharma C, Kumar S, Jain N. Singlet oxygen mediated dual C–C and C–N bond cleavage in visible light. Org Biomol Chem 2020; 18:2921-2928. [DOI: 10.1039/d0ob00563k] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A tandem cleavage of carbon–carbon and carbon–nitrogen bonds in imidazo[1,2-a]pyridines and imidazo[1,2-a]quinolines is reported in the presence of eosin Y and visible light.
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Affiliation(s)
- Ritu
- Department of Chemistry
- Indian Institute of Technology
- New Delhi-110016
- India
| | - Charu Sharma
- Department of Chemistry
- Indian Institute of Technology
- New Delhi-110016
- India
| | - Sharvan Kumar
- Department of Chemistry
- Indian Institute of Technology
- New Delhi-110016
- India
| | - Nidhi Jain
- Department of Chemistry
- Indian Institute of Technology
- New Delhi-110016
- India
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13
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Zhang S, Wu C, Zhang Z, Wang T. Metal-Free Synthesis of 3-(Iso)quinolinyl 4-Chromenones and 3-(Iso)quinolinyl 4-Quinolones from (Iso)quinoline N-Oxides and Ynones. Org Lett 2019; 21:9995-9998. [PMID: 31794231 DOI: 10.1021/acs.orglett.9b03921] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Shan Zhang
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, No.620 West Chang’an Avenue, Xi’an 710119, China
| | - Chun Wu
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, No.620 West Chang’an Avenue, Xi’an 710119, China
| | - Zunting Zhang
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, No.620 West Chang’an Avenue, Xi’an 710119, China
| | - Tao Wang
- Key Laboratory of Applied Surface and Colloid Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shaanxi Normal University, No.620 West Chang’an Avenue, Xi’an 710119, China
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14
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Yuan JW, Zhu JL, Li B, Yang LY, Mao P, Zhang SR, Li YC, Qu LB. Transition-metal free C3-amidation of quinoxalin-2(1H)-ones using Selectfluor as a mild oxidant. Org Biomol Chem 2019; 17:10178-10187. [PMID: 31763665 DOI: 10.1039/c9ob02157d] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A practical and efficient synthetic route to construct a variety of 3-amidated quinoxalin-2(1H)-ones was developed via transition-metal free direct oxidative amidation of quinoxalin-2(1H)-ones with amidates using Selectfluor reagent as a mild oxidant. This protocol features mild reaction conditions, operational simplicity, broad substrate scope, and good to excellent yields.
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Affiliation(s)
- Jin-Wei Yuan
- School of Chemistry & Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medicinal Chemistry of Henan Province, Zhengzhou 450001, China.
| | - Jun-Liang Zhu
- School of Chemistry & Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medicinal Chemistry of Henan Province, Zhengzhou 450001, China.
| | - Bing Li
- School of Chemistry & Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medicinal Chemistry of Henan Province, Zhengzhou 450001, China.
| | - Liang-Yu Yang
- School of Chemistry & Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medicinal Chemistry of Henan Province, Zhengzhou 450001, China.
| | - Pu Mao
- School of Chemistry & Chemical Engineering, Henan University of Technology; Academician Workstation for Natural Medicinal Chemistry of Henan Province, Zhengzhou 450001, China.
| | - Shou-Ren Zhang
- Henan Key Laboratory of Nanocomposites and Applications; Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou 450006, China
| | - Yan-Chun Li
- Henan Key Laboratory of Nanocomposites and Applications; Institute of Nanostructured Functional Materials, Huanghe Science and Technology College, Zhengzhou 450006, China
| | - Ling-Bo Qu
- College of Chemistry and Molecular Engineering, Zhengzhou University, Zhengzhou 450001, China
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15
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Dhiman AK, Chandra D, Kumar R, Sharma U. Catalyst-Free Synthesis of 2-Anilinoquinolines and 3-Hydroxyquinolines via Three-Component Reaction of Quinoline N-Oxides, Aryldiazonium Salts, and Acetonitrile. J Org Chem 2019; 84:6962-6969. [DOI: 10.1021/acs.joc.9b00739] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Affiliation(s)
- Ankit Kumar Dhiman
- Natural Product Chemistry & Process Development Division and AcSIR, CSIR-IHBT, Palampur 176061, India
| | - Devesh Chandra
- Natural Product Chemistry & Process Development Division and AcSIR, CSIR-IHBT, Palampur 176061, India
| | - Rakesh Kumar
- Natural Product Chemistry & Process Development Division and AcSIR, CSIR-IHBT, Palampur 176061, India
| | - Upendra Sharma
- Natural Product Chemistry & Process Development Division and AcSIR, CSIR-IHBT, Palampur 176061, India
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16
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Yuan J, Zhu J, Fu J, Yang L, Xiao Y, Mao P, Du X, Qu L. Highly efficient copper-catalyzed direct C–H amidation of quinoxalin-2(1H)-ones with amidates under microwave irradiation. Org Chem Front 2019. [DOI: 10.1039/c9qo00063a] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
A novel and convenient protocol for the construction of 3-amidated quinoxalin-2(1H)-ones was developed via copper-catalyzed direct oxidative amidation of quinoxalin-2(1H)-ones with amidates using K2S2O8 as an oxidant, and under microwave irradiation.
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Affiliation(s)
- Jinwei Yuan
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Academician Workstation for Natural Medicinal Chemistry of Henan Province
- Zhengzhou 450001
- P. R. China
| | - Junliang Zhu
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Academician Workstation for Natural Medicinal Chemistry of Henan Province
- Zhengzhou 450001
- P. R. China
| | - Junhao Fu
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Academician Workstation for Natural Medicinal Chemistry of Henan Province
- Zhengzhou 450001
- P. R. China
| | - Liangru Yang
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Academician Workstation for Natural Medicinal Chemistry of Henan Province
- Zhengzhou 450001
- P. R. China
| | - Yongmei Xiao
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Academician Workstation for Natural Medicinal Chemistry of Henan Province
- Zhengzhou 450001
- P. R. China
| | - Pu Mao
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Academician Workstation for Natural Medicinal Chemistry of Henan Province
- Zhengzhou 450001
- P. R. China
| | - Xue Du
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Academician Workstation for Natural Medicinal Chemistry of Henan Province
- Zhengzhou 450001
- P. R. China
| | - Lingbo Qu
- School of Chemistry & Chemical Engineering
- Henan University of Technology
- Academician Workstation for Natural Medicinal Chemistry of Henan Province
- Zhengzhou 450001
- P. R. China
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