1
|
Sen PP, Roy VJ, Raha Roy S. Electrochemical Activation of the C-X Bond on Demand: Access to the Atom Economic Group Transfer Reaction Triggered by Noncovalent Interaction. J Org Chem 2022; 87:9551-9564. [PMID: 35816013 DOI: 10.1021/acs.joc.2c00529] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
An atom economic method demonstrates the involvement of noncovalent interaction via hydrogen or halogen bonding interaction in triggering paired electrolysis for the group transfer reactions. Specifically, this method demonstrated the bromination of several aromatic and heteroaromatic compounds through the activation of the C(sp3)-Br bond of organic-bromo derivatives on demand. This electrochemical protocol is mild, and mostly no additional electrolyte is needed, which makes the workup process straightforward. Unlike the existing regioselective monobromination methods, this work utilizes a relatively small amount (1.2 equiv) of bromine surrogates that releases bromine on demand under the electrochemical condition and after completion of the reaction generates acetophenone as a useful byproduct. Green metrics indicate this protocol has a very good atom efficiency with an E-factor of 26.86 kg of waste/1 kg of product. In addition to the scale-up process, this strategy could be extended to the transfer of chlorine and thioaryl units. An extensive mechanistic study is accomplished to validate the hypothesis of noncovalent interaction using computational, spectroscopic, and cyclic voltammetry studies. Finally, the applicability of this newly developed nonbonding interaction to trigger paired electrolysis was extended to the chemoselective debromination of several dihalo organic compounds.
Collapse
Affiliation(s)
- Partha Pratim Sen
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Vishal Jyoti Roy
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| | - Sudipta Raha Roy
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi 110016, India
| |
Collapse
|
2
|
Chen H, Wang Y, Liu Q, Guo Y, Cao S, Zhao Y. Synthesis and evaluation of photophysical properties of C‐3 halogenated derivatives of 2‐phenylimidazo[1,2‐
a
]pyridine. CHINESE J CHEM 2022. [DOI: 10.1002/cjoc.202200224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Hong Chen
- College of Chemistry Zhengzhou University Zhengzhou 450001 P.R. China
| | - Yanyan Wang
- College of Chemistry Zhengzhou University Zhengzhou 450001 P.R. China
| | - Qingjie Liu
- College of Chemistry Zhengzhou University Zhengzhou 450001 P.R. China
| | - Yanchun Guo
- College of Chemistry Zhengzhou University Zhengzhou 450001 P.R. China
| | - Shuxia Cao
- College of Chemistry Zhengzhou University Zhengzhou 450001 P.R. China
| | - Yufen Zhao
- College of Chemistry Zhengzhou University Zhengzhou 450001 P.R. China
- Institute Drug Discovery Technology Ningbo University Ningbo 315211 P.R. China
| |
Collapse
|
3
|
Acharya S, Bhaumick P, Kumar R, Choudhury LH. Iodine-Catalyzed Multicomponent Synthesis of Highly Fluorescent Pyrimidine-Linked Imidazopyridines. ACS OMEGA 2022; 7:18660-18670. [PMID: 35694517 PMCID: PMC9178772 DOI: 10.1021/acsomega.2c01332] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Accepted: 04/20/2022] [Indexed: 06/15/2023]
Abstract
Herein, we report a metal-free one-pot three-component reaction of aryl methyl ketones, 2-aminopyridines, and barbituric acids for the synthesis of pyrimidine-linked imidazopyridines using a catalytic amount of molecular iodine in DMSO medium. This process involves a one-pot C-H oxidation, followed by the formation of one C-C and two C-N bonds. A wide variety of aryl methyl ketones and 2-aminopyridines were found to be suitable for this methodology. The UV and fluorescence properties of the synthesized products were studied in water and DMSO media. Most of the synthesized products exhibited very good to excellent fluorescence quantum yield. Among all the products, compounds 4p and 4q showed the maximum fluorescence quantum yield (0.36) in water medium under basic conditions and compound 4c showed the maximum fluorescence quantum yield (0.75) in DMSO medium.
Collapse
|
4
|
Zhou Z, Luo D, Li G, Yang Z, Cui L, Yang W. Copper-catalyzed three-component reaction to synthesize polysubstituted imidazo[1,2- a]pyridines. RSC Adv 2022; 12:20199-20205. [PMID: 35919587 PMCID: PMC9280286 DOI: 10.1039/d2ra02722d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Accepted: 07/07/2022] [Indexed: 12/02/2022] Open
Abstract
An efficient three-component one-pot and operationally simple cascade of 2-aminopyridines with sulfonyl azides and terminal ynones is reported, providing a variety of polysubstituted imidazo[1,2-a]pyridine derivatives in moderate to excellent yields. In particular, the reaction goes a through CuAAC/ring-cleavage process and forms a highly active intermediate α-acyl-N-sulfonyl ketenimine with base free. Three-component one-pot synthesis of polysubstituted imidazo[1,2-a]pyridine derivatives through a base free CuAAC/ring-cleavage process.![]()
Collapse
Affiliation(s)
- Zitong Zhou
- Public Service Platform of South China Sea for R&D Marine Biomedicine Resources, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, 524023, China
| | - Danyang Luo
- Public Service Platform of South China Sea for R&D Marine Biomedicine Resources, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, 524023, China
| | - Guanrong Li
- Public Service Platform of South China Sea for R&D Marine Biomedicine Resources, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, 524023, China
| | - Zhongtao Yang
- Public Service Platform of South China Sea for R&D Marine Biomedicine Resources, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, 524023, China
| | - Liao Cui
- Public Service Platform of South China Sea for R&D Marine Biomedicine Resources, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, 524023, China
| | - Weiguang Yang
- Public Service Platform of South China Sea for R&D Marine Biomedicine Resources, The Marine Biomedical Research Institute, Guangdong Medical University, Zhanjiang, 524023, China
- The Marine Biomedical Research Institute of Guangdong Zhanjiang, Zhanjiang, Guangdong, 524023, China
- Southern Marine Science and Engineering Guangdong Laboratory (Zhanjiang), Zhanjiang, Guangdong, 524023, China
| |
Collapse
|
5
|
Chen W, Li Z. One-Pot Synthesis of 3-Methyl-2-arylimidazo[1,2- a]pyridines Using Calcium Carbide as an Alkyne Source. J Org Chem 2021; 87:76-84. [PMID: 34933559 DOI: 10.1021/acs.joc.1c01877] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An efficient method for the construction of 3-methyl-2-arylimidazo[1,2-a]pyridines from the reactions of calcium carbide, 2-aminopyridines, and aromatic aldehydes is described. The notable advantages for this strategy include the use of an inexpensive and concise solid alkyne source, cheap and readily available raw materials, wide-scope substrates, and a simple work-up procedure.
Collapse
Affiliation(s)
- Wei Chen
- College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, P. R. China
| | - Zheng Li
- College of Chemistry and Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, P. R. China
| |
Collapse
|
6
|
Yang H, Huang N, Wang N, Shen H, Teng F, Liu X, Jiang H, Tan MC, Gui QW. Ultrasound-Assisted Iodination of Imidazo[1,2-α]pyridines Via C-H Functionalization Mediated by tert-Butyl Hydroperoxide. ACS OMEGA 2021; 6:25940-25949. [PMID: 34660956 PMCID: PMC8515396 DOI: 10.1021/acsomega.1c02645] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Accepted: 08/05/2021] [Indexed: 05/15/2023]
Abstract
A novel metal catalyst-free and environmentally friendly method for the regioselective iodination of imidazo[1,2-α]pyridines at their C3 position is disclosed, which has a wide substrate scope and could be sustainable. This reaction proceeds through ultrasound acceleration in the presence of a green alcohol solvent. Compared with a conventional heating system, the reaction efficiency and the rate are significantly improved and the iodine atom economy is maximized using ultrasound techniques.
Collapse
Affiliation(s)
- Hua Yang
- College
of Bioscience and Biotechnology, Hunan Agricultural
University, Changsha 410128, People’s Republic
of China
| | - Ning Huang
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Nengqing Wang
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Haicheng Shen
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Fan Teng
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Xiaoying Liu
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Hongmei Jiang
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Mei-Chen Tan
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| | - Qing-Wen Gui
- School
of Chemistry and Materials Science, Hunan
Agricultural University, Changsha 410128, People’s Republic
of China
| |
Collapse
|
7
|
Sree Uppalapati D, Sekhara Reddy Dachuru R, Veni Sunkara S. Metal-Free Regioselective Synthesis of 2-Nitro-3-arylimidazo[1,2-a]pyridines via Oxidative Amination under Air Using Silica Sulfuric Acid as an Effective Heterogeneous Catalyst. HETEROCYCLES 2021. [DOI: 10.3987/com-21-14464] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
|
8
|
Chen Q, Chen S, Wu H, Zeng X, Chen W, Sun G, Wang Z. Application of 2-Aminopyridines in the Synthesis of Five- and Six-Membered Azaheterocycles. CHINESE J ORG CHEM 2021. [DOI: 10.6023/cjoc202104011] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
|
9
|
Zhu S, Wang B, Li H, Xiao W, Teng F, Shen H, Gui Q, Li Z, Jiang H. Halogenation of Imidazo[1,2‐
α
]pyridines with DXDMH (X=Cl, Br and I) Using DMSO as a Solvent and an Oxidant. ChemistrySelect 2020. [DOI: 10.1002/slct.202003161] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Sha Zhu
- School of Chemistry and Materials Science Hunan Agricultural University Changsha 410128 People's Republic of China
| | - Binbin Wang
- School of Chemistry and Materials Science Hunan Agricultural University Changsha 410128 People's Republic of China
| | - Huiqin Li
- School of Chemistry and Materials Science Hunan Agricultural University Changsha 410128 People's Republic of China
| | - Wending Xiao
- Hunan Jiudian Pharmaceutical Co. Changsha 410009 People's Republic of China
| | - Fan Teng
- School of Chemistry and Materials Science Hunan Agricultural University Changsha 410128 People's Republic of China
| | - Haicheng Shen
- School of Chemistry and Materials Science Hunan Agricultural University Changsha 410128 People's Republic of China
| | - Qing‐Wen Gui
- School of Chemistry and Materials Science Hunan Agricultural University Changsha 410128 People's Republic of China
| | - Zhouchao Li
- School of Chemistry and Materials Science Hunan Agricultural University Changsha 410128 People's Republic of China
| | - Hongmei Jiang
- School of Chemistry and Materials Science Hunan Agricultural University Changsha 410128 People's Republic of China
| |
Collapse
|
10
|
Reddy RJ, Shankar A, Kumari AH. An Efficient Sequential One‐Pot Approach for the Synthesis of C3‐Functionalized Imidazo[1,2‐
a
]pyridines under Transition‐Metal Free Conditions. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900606] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Raju Jannapu Reddy
- Department of Chemistry University College of ScienceOsmania University Hyderabad 500 007 India
| | - Angothu Shankar
- Department of Chemistry University College of ScienceOsmania University Hyderabad 500 007 India
| | - Arram Haritha Kumari
- Department of Chemistry University College of ScienceOsmania University Hyderabad 500 007 India
| |
Collapse
|
11
|
Affiliation(s)
- Chenxi Yang
- Department of ChemistryLishui University No. 1, Xueyuan Road Lishui City 323000 Zhejiang Province P. R. China
| | - Xia Sheng
- Department of ChemistryLishui University No. 1, Xueyuan Road Lishui City 323000 Zhejiang Province P. R. China
| | - Ling Zhang
- Department of ChemistryLishui University No. 1, Xueyuan Road Lishui City 323000 Zhejiang Province P. R. China
| | - Jiang Yu
- Department of ChemistryLishui University No. 1, Xueyuan Road Lishui City 323000 Zhejiang Province P. R. China
| | - Dayun Huang
- Department of ChemistryLishui University No. 1, Xueyuan Road Lishui City 323000 Zhejiang Province P. R. China
| |
Collapse
|
12
|
Khamees HA, Chaluvaiah K, El-khatatneh NA, Swamynayaka A, Chong KH, Dasappa JP, Madegowda M. Crystal structure, DFT calculation, Hirshfeld surface analysis and energy framework study of 6-bromo-2-(4-bromo-phen-yl)imidazo[1,2- a]pyridine. Acta Crystallogr E Crystallogr Commun 2019; 75:1620-1626. [PMID: 31709079 PMCID: PMC6829731 DOI: 10.1107/s2056989019013410] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/18/2019] [Accepted: 09/30/2019] [Indexed: 11/13/2022]
Abstract
The title imidazo[1,2-a] pyridine derivative, C13H8Br2N2, was synthesized via a single-step reaction method. The title mol-ecule is planar, showing a dihedral angle of 0.62 (17)° between the phenyl and the imidazo[1,2-a] pyridine rings. An intra-molecular C-H⋯N hydrogen bond with an S(5) ring motif is present. In the crystal, a short H⋯H contact links adjacent mol-ecules into inversion-related dimers. The dimers are linked in turn by weak C-H⋯π and slipped π-π stacking inter-actions, forming layers parallel to (110). The layers are connected into a three-dimensional network by short Br⋯H contacts. Two-dimensional fingerprint plots and three-dimensional Hirshfeld surface analysis of the inter-molecular contacts reveal that the most important contributions for the crystal packing are from H⋯Br/Br⋯H (26.1%), H⋯H (21.7%), H⋯C/C⋯H (21.3%) and C⋯C (6.5%) inter-actions. Energy framework calculations suggest that the contacts formed between mol-ecules are largely dispersive in nature. Analysis of HOMO-LUMO energies from a DFT calculation reveals the pure π character of the aromatic rings with the highest electron density on the phenyl ring, and σ character of the electron density on the Br atoms. The HOMO-LUMO gap was found to be 4.343 eV.
Collapse
Affiliation(s)
- Hussien Ahmed Khamees
- Department of Studies in Physics, Manasagangotri, University of Mysore, Mysuru 570 006, Karnataka, India
| | - Kumara Chaluvaiah
- Department of Chemistry, Mangalore University, Mangalagangothri, Mangaluru 574 199, Karnataka, India
| | - Nasseem Ahmed El-khatatneh
- Department of Studies in Physics, Manasagangotri, University of Mysore, Mysuru 570 006, Karnataka, India
| | - Ananda Swamynayaka
- Department of Studies in Physics, Manasagangotri, University of Mysore, Mysuru 570 006, Karnataka, India
| | - Kwong Huey Chong
- Department of Chemistry, Faculty of Science, Universiti Putra Malaysia 43400, UPM Serdang, Selangor Darul Ehsan, Malaysia
| | - Jagadeesh Prasad Dasappa
- Department of Chemistry, Mangalore University, Mangalagangothri, Mangaluru 574 199, Karnataka, India
| | - Mahendra Madegowda
- Department of Studies in Physics, Manasagangotri, University of Mysore, Mysuru 570 006, Karnataka, India
| |
Collapse
|
13
|
Said MS, Mishra A, Pandole S, Nayak RA, Kumar P, Gajbhiye JM. Regioselective One‐Pot Synthesis of 3‐Fluoro‐Imidazo[1,2‐a]pyridines from Styrene. ASIAN J ORG CHEM 2019. [DOI: 10.1002/ajoc.201900521] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Madhukar S. Said
- Division of Organic ChemistryCSIR-National Chemical Laboratory Dr. Homi Bhabha Road Pune- 411008 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Ankita Mishra
- Division of Organic ChemistryCSIR-National Chemical Laboratory Dr. Homi Bhabha Road Pune- 411008 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Satish Pandole
- Division of Organic ChemistryCSIR-National Chemical Laboratory Dr. Homi Bhabha Road Pune- 411008 India
| | - Rashmi A. Nayak
- Division of Organic ChemistryCSIR-National Chemical Laboratory Dr. Homi Bhabha Road Pune- 411008 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Pradeep Kumar
- Division of Organic ChemistryCSIR-National Chemical Laboratory Dr. Homi Bhabha Road Pune- 411008 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Jayant M. Gajbhiye
- Division of Organic ChemistryCSIR-National Chemical Laboratory Dr. Homi Bhabha Road Pune- 411008 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| |
Collapse
|
14
|
Reen GK, Kumar A, Sharma P. Recent advances on the transition-metal-catalyzed synthesis of imidazopyridines: an updated coverage. Beilstein J Org Chem 2019; 15:1612-1704. [PMID: 31435443 PMCID: PMC6664406 DOI: 10.3762/bjoc.15.165] [Citation(s) in RCA: 42] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/27/2019] [Accepted: 06/28/2019] [Indexed: 12/21/2022] Open
Abstract
A comprehensive account of recent advances in the synthesis of imidazopyridines, assisted through transition-metal-catalyzed multicomponent reactions, C-H activation/functionalization and coupling reactions are highlighted in this review article. The basic illustration of this review comprises of schemes with concise account of explanatory text. The schemes depict the reaction conditions along with a quick look into the mechanism involved to render a deep understanding of the catalytic role. At some instances optimizations of certain features have been illustrated through tables, i.e., selectivity of catalyst, loading of the catalyst and percentage yield with different substrates. Each of the reported examples has been rigorously analyzed for reacting substrates, reaction conditions and transition metals used as the catalyst. This review will be helpful to the chemists in understanding the challenges associated with the reported methods as well as the future possibilities, both in the choice of substrates and catalysts. This review would be quite appealing to a wider range of organic chemists in academia and industrial R&D sectors working in the field of heterocyclic syntheses. In a nutshell, this review will be a guiding torch to envisage: (i) the role of various transition metals in the domain dedicated towards method development and (ii) for the modifications needed thereof in the R&D sector.
Collapse
Affiliation(s)
| | - Ashok Kumar
- School of Chemical Sciences, Devi Ahilya University, Indore, (M. P.), India
| | - Pratibha Sharma
- School of Chemical Sciences, Devi Ahilya University, Indore, (M. P.), India
| |
Collapse
|
15
|
Chen Z, Liang P, Xu F, Qiu R, Tan Q, Long L, Ye M. Lewis Acid-Catalyzed Intermolecular Annulation: Three-Component Reaction toward Imidazo[1,2- a]pyridine Thiones. J Org Chem 2019; 84:9369-9377. [PMID: 31274309 DOI: 10.1021/acs.joc.9b01188] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
A Lewis acid-catalyzed three-component annulation reaction of 2-aminopyridines and ynals with elemental sulfur was established. A series of imidazo[1,2-a]pyridine thiones was obtained in moderate to excellent yields. The merits of this transformation include easily available starting materials, multiple C-heteroatom bond formation in one pot, good functional group tolerance, elemental sulfur as S source, operational simplicity, etc.
Collapse
Affiliation(s)
- Zhengwang Chen
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province , Gannan Normal University , Ganzhou 341000 , P. R. China
| | - Pei Liang
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province , Gannan Normal University , Ganzhou 341000 , P. R. China
| | - Fan Xu
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province , Gannan Normal University , Ganzhou 341000 , P. R. China
| | - Rulin Qiu
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province , Gannan Normal University , Ganzhou 341000 , P. R. China
| | - Qi Tan
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province , Gannan Normal University , Ganzhou 341000 , P. R. China
| | - Lipeng Long
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province , Gannan Normal University , Ganzhou 341000 , P. R. China
| | - Min Ye
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province , Gannan Normal University , Ganzhou 341000 , P. R. China
| |
Collapse
|
16
|
Jian W, Wang H, Du K, Zhong W, Huang J. Electrochemical Synthesis of 3‐Bromoimidazo[1,2‐a]pyridines Directly from 2‐Aminopyridines and
alpha
‐Bromoketones. ChemElectroChem 2019. [DOI: 10.1002/celc.201900406] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Wen‐Qian Jian
- Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of Technology Guangzhou 510640 P. R. CHINA
| | - Hai‐Bin Wang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of Technology Guangzhou 510640 P. R. CHINA
| | - Ke‐Si Du
- Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of Technology Guangzhou 510640 P. R. CHINA
| | - Wei‐Qiang Zhong
- Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of Technology Guangzhou 510640 P. R. CHINA
| | - Jing‐Mei Huang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province School of Chemistry and Chemical EngineeringSouth China University of Technology Guangzhou 510640 P. R. CHINA
| |
Collapse
|
17
|
Zhou B, Yuan Y, Jin H, Liu Y. I2O5-Mediated Iodocyclization Cascade of N-(1-Arylallyl)pyridine-2-amines with Concomitant C═C Bond Cleavage: A Synthesis of 3-Iodoimidazo[1,2-a]pyridines. J Org Chem 2019; 84:5773-5782. [PMID: 30983338 DOI: 10.1021/acs.joc.9b00765] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Bingwei Zhou
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, People’s Republic of China
| | - Yuan Yuan
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, People’s Republic of China
| | - Hongwei Jin
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, People’s Republic of China
| | - Yunkui Liu
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, People’s Republic of China
| |
Collapse
|
18
|
Katrun P, Kuhakarn C. K2S2O8-Mediated halogenation of 2-arylimidazo[1,2-a]pyridines using sodium halides as the halogen sources. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.03.008] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
|
19
|
Kwong HC, Chidan Kumar CS, Mah SH, Mah YL, Chia TS, Quah CK, Lim GK, Chandraju S. Crystal Correlation Of Heterocyclic Imidazo[1,2-a]pyridine Analogues and Their Anticholinesterase Potential Evaluation. Sci Rep 2019; 9:926. [PMID: 30700752 PMCID: PMC6354011 DOI: 10.1038/s41598-018-37486-7] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2018] [Accepted: 12/05/2018] [Indexed: 12/20/2022] Open
Abstract
Imidazo[1,2-a]pyridine-based compounds are clinically important to the treatments of heart and circulatory failures, while many are under development for pharmaceutical uses. In this study, a series of imidazo[1,2-a]pyridine-based derivatives 2(a-o) were synthesized by reacting a-haloketones with 2-aminopyridines in a basic media at ambient temperature. Single crystal X-ray diffraction studies suggest that with low degree-of-freedom, the introduction of bulky adamantyl or electron-rich biphenyl moiety into the imidazopyridine derivatives will not affect its structural occupancy. Imidazo[1,2-a]pyridine-based derivatives with biphenyl side chain are potential AChE inhibitors. Compound 2h which bears a biphenyl side chain and methyl substituent at the position R4 of the imidazo[1,2-a]pyridine ring showed the strongest AChE inhibition with an IC50 value of 79 µM. However, imidazo[1,2-a]pyridine derivatives with phenyl side chain exhibit better BChE inhibition effect among the series. Compound 2j with 3,4-dichlorophenyl side chain and unsubstituted imidazo[1,2-a]pyridine ring appears to be the strongest BChE inhibitor with an IC50 value of 65 µM and good selectivity. The inhibitory effects of active compounds were further confirmed by computational molecular docking studies. The results unveiled that peripheral anionic sites of AChE and acyl pocket of BChE were the predominated binding sites for the subjected inhibitors.
Collapse
Affiliation(s)
- Huey Chong Kwong
- School of Chemical Sciences, Universiti Sains Malaysia, Penang, 11800 USM, Malaysia.
| | - C S Chidan Kumar
- Department of Engineering Chemistry, Vidya Vikas Institute of Engineering & Technology, Visvesvaraya Technological University, Alanahalli, Mysuru, 570028, Karnataka, India
| | - Siau Hui Mah
- School of Biosciences, Taylor's University, Lakeside Campus, 47500, Subang Jaya, Selangor, Malaysia
| | - Yew Leng Mah
- Hospital Pulau Pinang, Jalan Residensi, 10990 George Town, Pulau Pinang, Malaysia
| | - Tze Shyang Chia
- X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, Penang, 11800 USM, Malaysia
| | - Ching Kheng Quah
- X-ray Crystallography Unit, School of Physics, Universiti Sains Malaysia, Penang, 11800 USM, Malaysia.
| | - Gin Keat Lim
- School of Chemical Sciences, Universiti Sains Malaysia, Penang, 11800 USM, Malaysia
| | | |
Collapse
|
20
|
Liu Y, Lu L, Zhou H, Xu F, Ma C, Huang Z, Xu J, Xu S. Chemodivergent synthesis of N-(pyridin-2-yl)amides and 3-bromoimidazo[1,2-a]pyridines from α-bromoketones and 2-aminopyridines. RSC Adv 2019; 9:34671-34676. [PMID: 35529989 PMCID: PMC9073897 DOI: 10.1039/c9ra06724h] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2019] [Accepted: 10/21/2019] [Indexed: 11/21/2022] Open
Abstract
N-(Pyridin-2-yl)amides and 3-bromoimidazo[1,2-a]pyridines were synthesized respectively from α-bromoketones and 2-aminopyridine under different reaction conditions.
Collapse
Affiliation(s)
- Yanpeng Liu
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry
- China Pharmaceutical University
- Nanjing 210009
- China
- Department of Chemistry
| | - Lixue Lu
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry
- China Pharmaceutical University
- Nanjing 210009
- China
| | - Haipin Zhou
- College of Materials & Chemical Engineering
- Chuzhou University
- Chuzhou 239000
- China
| | - Feijie Xu
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry
- China Pharmaceutical University
- Nanjing 210009
- China
| | - Cong Ma
- State Key Laboratory of Chemical Biology and Drug Discovery
- Department of Applied Biology and Chemical Technology
- The Hong Kong Polytechnic University
- Kowloon
- P. R. China
| | - Zhangjian Huang
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry
- China Pharmaceutical University
- Nanjing 210009
- China
| | - Jinyi Xu
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry
- China Pharmaceutical University
- Nanjing 210009
- China
| | - Shengtao Xu
- State Key Laboratory of Natural Medicines and Department of Medicinal Chemistry
- China Pharmaceutical University
- Nanjing 210009
- China
| |
Collapse
|
21
|
|
22
|
Dey A, Singsardar M, Sarkar R, Hajra A. Environment-Friendly Protocol for the Chlorination of Imidazoheterocycles by Chloramine-T. ACS OMEGA 2018; 3:3513-3521. [PMID: 31458602 PMCID: PMC6641228 DOI: 10.1021/acsomega.7b01844] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2017] [Accepted: 03/15/2018] [Indexed: 05/27/2023]
Abstract
An environment-friendly method for the chlorination of imidazoheterocycles has been developed using chloramine-T, a novel chlorinating reagent. A bunch of C-3 chloro-substituted imidazo[1,2-a]pyridines with variety of functionalities have been synthesized in good yields under neat condition at room temperature within very short time. This chlorination process is also applicable to imidazo[2,1-b]thiazole scaffolds. The present methodology is relevant to gram-scale synthesis. The major advantages of this system such as wide applicability, easy availability of reactants, open-air and metal- and solvent-free reaction conditions, no need of work-up, and simple purification technique represent a green synthetic protocol.
Collapse
|
23
|
Liu Y, Wang W, Han J, Sun J. A Cu(ii)-promoted tandem decarboxylative halogenation and oxidative diamination reaction of 2-aminopyridines with alkynoic acids for the synthesis of 2-haloimidazo[1,2-a]pyridines. Org Biomol Chem 2017; 15:9311-9318. [PMID: 29083000 DOI: 10.1039/c7ob02014g] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
A copper-promoted cascade decarboxylative halogenation and oxidative diamination reaction sequence of 2-aminopyridines with alkynoic acids has been developed for the synthesis of 2-haloimidazo[1,2-a]pyridines. In this reaction, two C-N bonds and one C-halogen bond are formed in one pot, generating the desired products in good yields. This is the first report on the synthesis of 2-haloimidazo[1,2-a]pyridine derivatives from alkynoic acids.
Collapse
Affiliation(s)
- Yun Liu
- Jiangsu Key Laboratory of Green Synthesis for Functional Materials and School of Chemistry and Material Science, Jiangsu Normal University, Xuzhou 221116, Jiangsu, P. R. China.
| | | | | | | |
Collapse
|
24
|
Ravi C, Adimurthy S. Synthesis of Imidazo[1,2‐a]pyridines: C‐H Functionalization in the Direction of C‐S Bond Formation. CHEM REC 2017; 17:1019-1038. [DOI: 10.1002/tcr.201600146] [Citation(s) in RCA: 56] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2016] [Accepted: 02/27/2017] [Indexed: 01/22/2023]
Affiliation(s)
- Chitrakar Ravi
- Natural Products & Green ChemistryCSIR-Central Salt & Marine Chemicals Research Institute G.B. Marg, Bhavnagar-364002 Gujarat India
| | - Subbarayappa Adimurthy
- Natural Products & Green ChemistryCSIR-Central Salt & Marine Chemicals Research Institute G.B. Marg, Bhavnagar-364002 Gujarat India
| |
Collapse
|
25
|
Silver-catalyzed highly efficient synthesis of pyrido[1,2- a ]pyrimidin-4-ones from 2-aminopyridines and alkynoates. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2016.11.079] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
|
26
|
Cu-Pybox catalyzed synthesis of 2,3-disubstituted imidazo[1,2-a]pyridines from 2-aminopyridines and propargyl alcohol derivatives. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.09.013] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
|
27
|
Wang Z, Li B, Zhang X, Fan X. One-Pot Cascade Reactions Leading to Pyrido[2′,1′:2,3]imidazo[4,5-c][1,2,3]triazolo[1,5-a]quinolines under Bimetallic Relay Catalysis with Air as the Oxidant. J Org Chem 2016; 81:6357-63. [DOI: 10.1021/acs.joc.6b00996] [Citation(s) in RCA: 44] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Ze Wang
- School of Chemistry and Chemical
Engineering, Collaborative Innovation Center of Henan Province for
Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical
Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, China
| | - Bin Li
- School of Chemistry and Chemical
Engineering, Collaborative Innovation Center of Henan Province for
Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical
Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xinying Zhang
- School of Chemistry and Chemical
Engineering, Collaborative Innovation Center of Henan Province for
Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical
Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xuesen Fan
- School of Chemistry and Chemical
Engineering, Collaborative Innovation Center of Henan Province for
Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical
Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, China
| |
Collapse
|
28
|
Wan JP, Hu D, Liu Y, Li L, Wen C. Copper-catalyzed intramolecular oxidative amination of enaminone C–H bond for the synthesis of imidazo[1,2- a ]pyridines. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.05.064] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
|
29
|
Samanta S, Jana S, Mondal S, Monir K, Chandra SK, Hajra A. Switching the regioselectivity in the copper-catalyzed synthesis of iodoimidazo[1,2-a]pyridines. Org Biomol Chem 2016; 14:5073-8. [PMID: 27182027 DOI: 10.1039/c6ob00656f] [Citation(s) in RCA: 34] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
A unique copper-catalyzed binucleophilic switching of 2-aminopyridine has been developed for the regioselective synthesis of 2- and 3-iodoimidazo[1,2-a]pyridines using alkenes/alkynes as coupling partners in the presence of molecular iodine under aerobic reaction conditions. This method was also applied to the synthesis of 2-iodo-3-phenylbenzo[d]imidazo[2,1-b]thiazoles. This protocol offers an easy route towards the synthesis of 2,3-diarylimidazo[1,2-a]pyridines.
Collapse
Affiliation(s)
- Sadhanendu Samanta
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
| | | | | | | | | | | |
Collapse
|
30
|
Zhang J, Zhang X, Fan X. Synthesis of Indeno[1′,2′:4,5]imidazo[1,2-a]pyridin-11-ones and Chromeno[4′,3′:4,5]imidazo[1,2-a]pyridin-6-ones through Palladium-Catalyzed Cascade Reactions of 2-(2-Bromophenyl)imidazo[1,2-a]pyridines. J Org Chem 2016; 81:3206-13. [DOI: 10.1021/acs.joc.6b00166] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Ju Zhang
- School of Chemistry and Chemical
Engineering, Collaborative Innovation Center of Henan Province for
Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical
Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xinying Zhang
- School of Chemistry and Chemical
Engineering, Collaborative Innovation Center of Henan Province for
Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical
Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, China
| | - Xuesen Fan
- School of Chemistry and Chemical
Engineering, Collaborative Innovation Center of Henan Province for
Green Manufacturing of Fine Chemicals, Key Laboratory of Green Chemical
Media and Reactions, Ministry of Education, Henan Normal University, Xinxiang, Henan 453007, China
| |
Collapse
|
31
|
Huo C, Tang J, Xie H, Wang Y, Dong J. CBr4 Mediated Oxidative C–N Bond Formation: Applied in the Synthesis of Imidazo[1,2-α]pyridines and Imidazo[1,2-α]pyrimidines. Org Lett 2016; 18:1016-9. [DOI: 10.1021/acs.orglett.6b00137] [Citation(s) in RCA: 70] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
Affiliation(s)
- Congde Huo
- Key Laboratory
of Eco-Environment-Related
Polymer Materials Ministry of Education, College of Chemistry and
Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China
| | - Jing Tang
- Key Laboratory
of Eco-Environment-Related
Polymer Materials Ministry of Education, College of Chemistry and
Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China
| | - Haisheng Xie
- Key Laboratory
of Eco-Environment-Related
Polymer Materials Ministry of Education, College of Chemistry and
Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China
| | - Yajun Wang
- Key Laboratory
of Eco-Environment-Related
Polymer Materials Ministry of Education, College of Chemistry and
Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China
| | - Jie Dong
- Key Laboratory
of Eco-Environment-Related
Polymer Materials Ministry of Education, College of Chemistry and
Chemical Engineering, Northwest Normal University, Lanzhou, Gansu 730070, China
| |
Collapse
|
32
|
Ravi C, Chandra Mohan D, Adimurthy S. Dual role of p-tosylchloride: copper-catalyzed sulfenylation and metal free methylthiolation of imidazo[1,2-a]pyridines. Org Biomol Chem 2016; 14:2282-90. [PMID: 26795550 DOI: 10.1039/c5ob02475g] [Citation(s) in RCA: 76] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
Copper-catalyzed regioselective C-3 sulfenylation of imidazo[1,2-a]pyridines using p-tosylchloride as a benign source of sulfenylating agents has been developed. On the other hand, p-tosylchloride mediated thiomethylation of imidazo[1,2-a]pyridines with dimethylsulfoxide as a source of thiomethylation under metal-free conditions was also described.
Collapse
Affiliation(s)
- Chitrakar Ravi
- Academy of Scientific & Innovative Research, CSIR - Central Salt & Marine Chemicals Research Institute, G. B. Marg, Bhavnagar-364 002, Gujarat, India.
| | | | | |
Collapse
|
33
|
Payra S, Saha A, Wu CM, Selvaratnam B, Dramstad T, Mahoney L, Verma SK, Thareja S, Koodali R, Banerjee S. Fe–SBA-15 catalyzed synthesis of 2-alkoxyimidazo[1,2-a]pyridines and screening of their in silico selectivity and binding affinity to biological targets. NEW J CHEM 2016. [DOI: 10.1039/c6nj02134d] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Regioselective synthesis of 2-alkoxyimidazopyridines by Fe-SBA-15 and screening of their in silico binding affinity to biological targets.
Collapse
Affiliation(s)
- Soumen Payra
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya (A Central University)
- Bilaspur-495009
- India
| | - Arijit Saha
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya (A Central University)
- Bilaspur-495009
- India
| | - Chia-Ming Wu
- Department of Chemistry
- University of South Dakota
- Vermillion
- USA
| | | | - Thorn Dramstad
- Department of Chemistry
- University of South Dakota
- Vermillion
- USA
| | - Luther Mahoney
- Department of Chemistry
- University of South Dakota
- Vermillion
- USA
| | - Sant Kumar Verma
- School of Pharmaceutical Sciences
- Guru Ghasidas Vishwavidyalaya (A Central University)
- Bilaspur-495009
- India
| | - Suresh Thareja
- School of Pharmaceutical Sciences
- Guru Ghasidas Vishwavidyalaya (A Central University)
- Bilaspur-495009
- India
| | - Ranjit Koodali
- Department of Chemistry
- University of South Dakota
- Vermillion
- USA
| | - Subhash Banerjee
- Department of Chemistry
- Guru Ghasidas Vishwavidyalaya (A Central University)
- Bilaspur-495009
- India
| |
Collapse
|
34
|
Chen Z, Wen Y, Luo G, Ye M, Wang Q. Transition-metal-free C–C bond cleavage and formation: efficient synthesis of 2,3-diarylimidazo[1,2-α]pyridines from 2-aminopyridines and alkynoates. RSC Adv 2016. [DOI: 10.1039/c6ra19291b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
A highly efficient transition-metal-free cyclization reaction for the synthesis of 2,3-diarylimidazo[1,2-α]pyridines is described.
Collapse
Affiliation(s)
- Zhengwang Chen
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou
- China
| | - Yuelu Wen
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou
- China
| | - Guotian Luo
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou
- China
| | - Min Ye
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou
- China
| | - Qinghao Wang
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou
- China
| |
Collapse
|
35
|
Payra S, Saha A, Banerjee S. Nano-NiFe2O4 catalyzed microwave assisted one-pot regioselective synthesis of novel 2-alkoxyimidazo[1,2-a]pyridines under aerobic conditions. RSC Adv 2016. [DOI: 10.1039/c5ra25540f] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Here, we have demonstrated regioselective synthesis of novel 2-alkoxy-3-arylimidazo[1,2-a]pyridines using nano-NiFe2O4 as reusable catalyst via one-pot sequential aza-Michael addition, Fe-promoted ligand transfer and C–H imination reactions.
Collapse
Affiliation(s)
- Soumen Payra
- Department of Chemistry
- Guru GhasidasVishwavidyalaya (A Central University)
- Bilaspur–495009
- India
| | - Arijit Saha
- Department of Chemistry
- Guru GhasidasVishwavidyalaya (A Central University)
- Bilaspur–495009
- India
| | - Subhash Banerjee
- Department of Chemistry
- Guru GhasidasVishwavidyalaya (A Central University)
- Bilaspur–495009
- India
| |
Collapse
|
36
|
Sagar A, Nagarjuna Babu V, Shinde AH, Sharada DS. A metal-free cyclic iminium induced one-pot double annulation cascade: access to dihydroisoquinolinium (DHIQ) salts. Org Biomol Chem 2016; 14:10366-10370. [DOI: 10.1039/c6ob02089e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
A reactive cyclic iminium induced one-pot Groebke–Blackburn–Bienayme (GBB) double annulation cascade (DAC) for the synthesis of skeletally diverse DHIQ salts has been described. The key features of this protocol are solvent-free, robust method, clean reaction profile and operational simplicity.
Collapse
Affiliation(s)
- A. Sagar
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy
- India
| | | | - Anand H. Shinde
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy
- India
| | - Duddu S. Sharada
- Department of Chemistry
- Indian Institute of Technology Hyderabad
- Sangareddy
- India
| |
Collapse
|
37
|
Zhou X, Yan H, Ma C, He Y, Li Y, Cao J, Yan R, Huang G. Copper-Mediated Aerobic Oxidative Synthesis of 3-Bromo-imidazo[1,2-a]pyridines with Pyridines and Enamides. J Org Chem 2015; 81:25-31. [DOI: 10.1021/acs.joc.5b02384] [Citation(s) in RCA: 35] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
Affiliation(s)
- Xiaoqiang Zhou
- State
Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, Department
of Chemistry, Lanzhou University, Lanzhou, 730000, China
| | - Hao Yan
- State
Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, Department
of Chemistry, Lanzhou University, Lanzhou, 730000, China
- Shaanxi University of Chinese Medicine, Shiji Ave., Xi’an-Xianyang New Ecomic Zone, Shaanxi Province, Xianyang, 712046, China
| | - Chaowei Ma
- State
Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, Department
of Chemistry, Lanzhou University, Lanzhou, 730000, China
| | - Yongqin He
- State
Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, Department
of Chemistry, Lanzhou University, Lanzhou, 730000, China
| | - Yamin Li
- State
Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, Department
of Chemistry, Lanzhou University, Lanzhou, 730000, China
| | - Jinhui Cao
- State
Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, Department
of Chemistry, Lanzhou University, Lanzhou, 730000, China
| | - Rulong Yan
- State
Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, Department
of Chemistry, Lanzhou University, Lanzhou, 730000, China
| | - Guosheng Huang
- State
Key Laboratory of Applied Organic Chemistry, Key Laboratory of Nonferrous
Metal Chemistry and Resources Utilization of Gansu Province, Department
of Chemistry, Lanzhou University, Lanzhou, 730000, China
| |
Collapse
|