1
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Jiang S. Copper (II) complex supported on magnetic nanoparticles as a novel nanocatalyst for the synthesis of imidazo[1,2-a]pyridines. Mol Divers 2024:10.1007/s11030-023-10781-w. [PMID: 38267750 DOI: 10.1007/s11030-023-10781-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2023] [Accepted: 11/21/2023] [Indexed: 01/26/2024]
Abstract
Research on the synthesis of imidazo[1,2-a]pyridines has gained great importance among synthetic chemists because there have been numerous reports of their biological and medicinal activities. In this respect, we fabricated CuCl2 immobilized on Fe3O4 nanoparticles modified with 1,10-phenanthroline-5,6-diol [Fe3O4@Diol/Phen-CuCl2] and investigated its catalytic activity for the preparation of imidazo[1,2-a]pyridine derivatives through one-pot three-component reaction of 2-aminopyridines, aldehydes and terminal alkynes under ecofriendly conditions. FT-IR spectroscopy, EDX, SEM, TEM, XRD, TGA, VSM and ICP-OES techniques employed in order to identify the structure of the as-constructed Fe3O4@Diol/Phen-CuCl2 nanocatalyst. This catalytic system has a series of advantages such as the synthesis of imidazo[1,2-a]pyridine products with high yields in suitable time, performing the reactions in an environmentally friendly solvent (PEG), easy preparation of the catalyst with a simple method, and the recyclability of the Fe3O4@Diol/Phen-CuCl2 nanocatalyst.
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Affiliation(s)
- Shanshan Jiang
- Department of Chemistry and Chemical Engineering, Lvliang University, Lvliang, 033000, Shanxi, People's Republic of China.
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2
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Kumar R. Transition-Metal-Catalyzed 1,2-Diaminations of Olefins: Synthetic Methodologies and Mechanistic Studies. Chem Asian J 2024; 19:e202300705. [PMID: 37743249 DOI: 10.1002/asia.202300705] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2023] [Revised: 09/20/2023] [Accepted: 09/20/2023] [Indexed: 09/26/2023]
Abstract
1,2-Diamines are synthetically important motifs in organo-catalysis, natural products, and drug research. Continuous utilization of transition-metal based catalyst in direct 1,2-diamination of olefines, in contrast to metal-free transformations, with numerous impressive advances made in recent years (2015-2023). This review summarized contemporary research on the transition-metal catalyzed/mediated [e. g., Cu(II), Pd(II), Fe(II), Rh(III), Ir(III), and Co(II)] 1,2-diamination (asymmetric and non-asymmetric) especially emphasizing the recent synthetic methodologies and mechanistic understandings. Moreover, up-to-date discussion on (i) paramount role of oxidant and catalyst (ii) key achievements (iii) generality and uniqueness, (iv) synthetic limitations or future challenges, and (v) future opportunities are summarized related to this potential area.
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Affiliation(s)
- Ravinder Kumar
- Department of Chemistry, MMEC, Maharishi Markandeshwar (Deemed to be University), Mullana, Ambala, 133207, Haryana, INDIA
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3
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Saha P, Kumar R, Das S, Ansari T, Indra A, Sharma DK. Visible light induced regioselective C-3 thiocyanation of imidazoheterocycles through naphthalimide dye based photoredox catalysis. Org Biomol Chem 2023; 21:8471-8476. [PMID: 37843304 DOI: 10.1039/d3ob01100c] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2023]
Abstract
A visible light induced C-3 thiocyanation of imidazo[1,2-a]pyridines by using a naphthalimide based photoredox catalyst has been reported. Tolerance of electron withdrawing and donating groups at different positions of the imidazo[1,2-a]pyridine ring led to a wide substrate accessibility of this method. This methodology is further reproducible with other heterocycles like benzo[d]imidazo[2,1-b]thiazoles, indoles, azaindoles, and anilines.
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Affiliation(s)
- Pallavi Saha
- Department of Pharmaceutical Engineering and Technology, IIT-Banaras Hindu University, Varanasi, UP, 221005, India.
| | - Rohit Kumar
- Department of Pharmaceutical Engineering and Technology, IIT-Banaras Hindu University, Varanasi, UP, 221005, India.
| | - Samarpita Das
- Department of Pharmaceutical Engineering and Technology, IIT-Banaras Hindu University, Varanasi, UP, 221005, India.
| | - Toufik Ansari
- Department of Chemistry, IIT-Banaras Hindu University, Varanasi, UP, 221005, India
| | - Arindam Indra
- Department of Chemistry, IIT-Banaras Hindu University, Varanasi, UP, 221005, India
| | - Deepak K Sharma
- Department of Pharmaceutical Engineering and Technology, IIT-Banaras Hindu University, Varanasi, UP, 221005, India.
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4
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Zou X, Zheng L, Zhuo X, Zhong Y, Wu Y, Yang B, He Q, Guo W. Copper-Promoted Aerobic Oxidative [3+2] Cycloaddition Reactions of N,N-Disubstituted Hydrazines with Alkynoates: Access to Substituted Pyrazoles. J Org Chem 2023; 88:2190-2206. [PMID: 36724037 DOI: 10.1021/acs.joc.2c02610] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
A copper-promoted aerobic oxidative [3+2] cycloaddition reaction for the synthesis of various substituted pyrazoles from N,N-disubstituted hydrazines with alkynoates in the presence of bases is developed. This work involves a direct C(sp3)-H functionalization and the formation of new C-C/C-N bonds. In this strategy, inexpensive and easily available Cu2O serves as the promoter and air acts as the green oxidant. The reaction exhibits the advantages of high atom and step economy, high regioselectivity, and easy operation.
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Affiliation(s)
- Xiaoying Zou
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, China
| | - Lvyin Zheng
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, China
| | - Xiaoya Zhuo
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, China
| | - Yumei Zhong
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, China
| | - Yingying Wu
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, China
| | - Beining Yang
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, China
| | - Qifang He
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, China
| | - Wei Guo
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, China
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5
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Zeng X, Cheng Z, Xie Y, Gu Y. Transition-metal-free Synthesis of tetra-substituted Vinyl Iodides by Cascade Sequential Reaction of α-Keto Acids, 1-Iodoalkynes, and Alkyl Halides. Chem Asian J 2023; 18:e202201117. [PMID: 36458644 DOI: 10.1002/asia.202201117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2022] [Revised: 11/30/2022] [Accepted: 12/01/2022] [Indexed: 12/05/2022]
Abstract
The cascade sequential reaction of α-keto acids, 1-iodoalkynes, and alkyl halides are reported herein to synthesize tetra-substituted vinyl iodides. It represents an efficient protocol to access a diverse range of tetra-substituted vinyl iodides starting from simple materials in a one-pot fashion, featuring mild reaction conditions, ease of operation, and broad substrate scope.
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Affiliation(s)
- Xiaobao Zeng
- Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target School of Pharmacy, Nantong University, Nantong, 226001, P. R. China
| | - Zhenfeng Cheng
- Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target School of Pharmacy, Nantong University, Nantong, 226001, P. R. China
| | - Yushan Xie
- Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target School of Pharmacy, Nantong University, Nantong, 226001, P. R. China
| | - Yunhui Gu
- Jiangsu Province Key Laboratory for Inflammation and Molecular Drug Target School of Pharmacy, Nantong University, Nantong, 226001, P. R. China
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6
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Sanapalli BKR, Ashames A, Sigalapalli DK, Shaik AB, Bhandare RR, Yele V. Synthetic Imidazopyridine-Based Derivatives as Potential Inhibitors against Multi-Drug Resistant Bacterial Infections: A Review. Antibiotics (Basel) 2022; 11:1680. [PMID: 36551338 PMCID: PMC9774741 DOI: 10.3390/antibiotics11121680] [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: 10/29/2022] [Revised: 11/15/2022] [Accepted: 11/19/2022] [Indexed: 11/24/2022] Open
Abstract
Fused pyridines are reported to display various pharmacological activities, such as antipyretic, analgesic, antiprotozoal, antibacterial, antitumor, antifungal, anti-inflammatory, and antiapoptotic. They are widely used in the field of medicinal chemistry. Imidazopyridines (IZPs) are crucial classes of fused heterocycles that are expansively reported on in the literature. Evidence suggests that IZPs, as fused scaffolds, possess more diverse profiles than individual imidazole and pyridine moieties. Bacterial infections and antibacterial resistance are ever-growing risks in the 21st century. Only one IZP, i.e., rifaximin, is available on the market as an antibiotic. In this review, the authors highlight strategies for preparing other IZPs. A particular focus is on the antibacterial profile and structure-activity relationship (SAR) of various synthesized IZP derivatives. This research provides a foundation for the tuning of available compounds to create novel, potent antibacterial agents with fewer side effects.
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Affiliation(s)
- Bharat Kumar Reddy Sanapalli
- Department of Pharmacology, NIMS Institute of Pharmacy, NIMS University Rajasthan, Jaipur 303121, Rajasthan, India
| | - Akram Ashames
- College of Pharmacy & Health Sciences, Ajman University, Ajman P.O. Box 340, United Arab Emirates
- Center of Medical and Bio-Allied Health Sciences Research, Ajman University, Ajman P.O. Box 340, United Arab Emirates
| | - Dilep Kumar Sigalapalli
- Department of Pharmaceutical Chemistry, Vignan Pharmacy College, Jawaharlal Nehru Technological University, Vadlamudi 522213, Andhra Pradesh, India
| | - Afzal B. Shaik
- St. Mary’s College of Pharmacy, St. Mary’s Group of Institutions Guntur, Jawaharlal Nehru Technological University Kakinada, Guntur 522212, Andhra Pradesh, India
| | - Richie R. Bhandare
- College of Pharmacy & Health Sciences, Ajman University, Ajman P.O. Box 340, United Arab Emirates
- Center of Medical and Bio-Allied Health Sciences Research, Ajman University, Ajman P.O. Box 340, United Arab Emirates
| | - Vidyasrilekha Yele
- Department of Pharmaceutical Chemistry, NIMS Institute of Pharmacy, NIMS University Rajasthan, Jaipur 303121, Rajasthan, India
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7
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Synthesis of 3-N-/O-/S-methyl-imidazo[1,2-a] pyridine derivatives for caspase-3 mediated apoptosis induced anticancer activity. Bioorg Chem 2022; 125:105882. [DOI: 10.1016/j.bioorg.2022.105882] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/14/2022] [Revised: 04/19/2022] [Accepted: 05/16/2022] [Indexed: 11/22/2022]
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8
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Wang Y, Li S, Wang X, Yao Y, Feng L, Ma C. A multi pathway coupled domino strategy: I 2/TBHP-promoted synthesis of imidazopyridines and thiazoles via sp 3, sp 2 and sp C-H functionalization. RSC Adv 2022; 12:5919-5927. [PMID: 35424560 PMCID: PMC8981869 DOI: 10.1039/d1ra07438e] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2021] [Accepted: 11/21/2021] [Indexed: 12/21/2022] Open
Abstract
I2/TBHP-promoted, one-pot, multi pathway synthesis of imidazopyridines and thiazoles has been achieved through readily available ethylarenes, ethylenearenes and ethynearenes. I2/TBHP as an initiator and oxidant is used to realize the C-H functionalization of this domino reaction. Simple and available starting materials, wide range of functional group tolerance, high potential for drug activity of the products and application in production are the advantageous features of this method.
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Affiliation(s)
- Yishou Wang
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China
| | - Shichen Li
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China
| | - Xinfeng Wang
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China
| | - Yiming Yao
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China
| | - Lei Feng
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China
| | - Chen Ma
- School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China
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9
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Panda J, Raiguru BP, Mishra M, Mohapatra S, Nayak S. Recent Advances in the Synthesis of Imidazo[1,2‐
a
]pyridines: A Brief Review. ChemistrySelect 2022. [DOI: 10.1002/slct.202103987] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Jasmine Panda
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
| | - Bishnu P. Raiguru
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
| | - Mitali Mishra
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
| | - Seetaram Mohapatra
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
| | - Sabita Nayak
- Organic Synthesis Laboratory Department of Chemistry Ravenshaw University Cuttack 753003 Odisha India
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10
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Hou ZW, Mao ZY, Xu HC. Discovery of a tetraarylhydrazine catalyst for electrocatalytic synthesis of imidazo-fused N-heteroaromatic compounds. Org Biomol Chem 2021; 19:8789-8793. [PMID: 34585716 DOI: 10.1039/d1ob01644j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The development of electrocatalytic synthetic methods hinges on efficient molecular catalysts. Triarylamines are well-known redox catalysts because of the good stability of their corresponding amine radical cations. Herein we show that tris(4-(tert-butyl)phenyl)amine decomposes unexpectedly during electrolysis in MeOH/THF to afford a tetraarylhydrazine, 1,1,2,2-tetrakis(4-(tert-butyl)phenyl)hydrazine. In addition, we have applied this tetraarylhydrazine, which is either preprepared or formed in situ from tris(4-(tert-butyl)phenyl)amine, as an electrocatalyst for the synthesis of imidazopyridines and related N-heteroaromatic compounds through intramolecular [3 + 2] annulation. This metal-free electrocatalytic method provides straightforward access to the N-heteroaromatic compounds from readily available materials without the need for external chemical oxidants.
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Affiliation(s)
- Zhong-Wei Hou
- Advanced Research Institute and Department of Chemistry, Taizhou University, Taizhou 318000, P. R. China
| | - Zhong-Yi Mao
- Laboratory of Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China.
| | - Hai-Chao Xu
- Laboratory of Chemical Biology of Fujian Province, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, P. R. China.
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11
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El Akkaoui A, Koubachi J, Guillaumet G, El Kazzouli S. Synthesis and Functionalization of Imidazo[1,2‐
b
]Pyridazine by Means of Metal‐Catalyzed Cross‐Coupling Reactions. ChemistrySelect 2021. [DOI: 10.1002/slct.202101636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Ahmed El Akkaoui
- Laboratory of Analytical and Molecular Chemistry (LCAM) Polydisciplinary Faculty of Safi Cadi Ayyad University, Sidi Bouzid, B.P. 4162 46000 Safi Morocco
| | - Jamal Koubachi
- Polydisciplinary Faculty of Taroudant Laboratory of Applied and Environmental Chemistry (LACAPE) Faculty of Sciences Ibn Zohr University of Agadir, B.P 271 83000 Taroudant Morocco
| | - Gérald Guillaumet
- Institute of Organic and Analytical Chemistry University of Orleans, UMR CNRS 7311, BP 6759 45067 Orleans Cedex 2 France
- Euromed Research Centre School of Engineering in Biomedical and Biotechnology Euromed University of Fes (UEMF) Route de Meknès 30000 Fez Morocco
| | - Saïd El Kazzouli
- Euromed Research Centre School of Engineering in Biomedical and Biotechnology Euromed University of Fes (UEMF) Route de Meknès 30000 Fez Morocco
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12
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Mondal B, Ghosh P, Kundu M, Das S. 8-Aminoimidazo[1,2-a]pyridine (AIP) directed Pd(ii) catalysis: site-selective ortho-C(sp2)–H arylation in aqueous medium. Org Biomol Chem 2021; 19:1604-1609. [DOI: 10.1039/d0ob02510k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An efficient and facile Pd(ii) catalyzed selective ortho and β-C(sp2)–H arylation reaction employing the 8-AIP (aminoimidazo[1,2-a]pyridine) auxiliary as a removable N,N-bidentate directing group in a green solvent (water) has been reported.
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Affiliation(s)
- Biswajit Mondal
- TCG Life sciences Pvt. Ltd
- Kolkata 700091
- India
- Department of Chemistry
- University of North Bengal
| | - Prasanjit Ghosh
- Department of Chemistry
- University of North Bengal
- Darjeeling 734013
- India
| | | | - Sajal Das
- Department of Chemistry
- University of North Bengal
- Darjeeling 734013
- India
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13
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Mondal B, Ghosh P, Kundu M, Das TK, Das S. Palladium catalyzed 8-aminoimidazo[1,2-a]pyridine (AIP) directed selective β-C(sp2)–H arylation. Org Biomol Chem 2021; 19:360-364. [DOI: 10.1039/d0ob02134b] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
An unprecedented palladium(ii) catalyzed selective β-C(sp2)–H arylation reaction using an 8-AIP (aminoimidazo[1,2-a]pyridine) auxiliary as a new N,N-bidentate directing group has been demonstrated.
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Affiliation(s)
- Biswajit Mondal
- TCG Life Sciences Pvt. Ltd
- Kolkata-700091
- India
- Department of Chemistry
- University of North Bengal
| | - Prasanjit Ghosh
- Department of Chemistry
- University of North Bengal
- Darjeeling 734013
- India
| | | | - Tapas Kumar Das
- TCG Life Sciences Pvt. Ltd
- Kolkata-700091
- India
- Department of Chemistry
- University of North Bengal
| | - Sajal Das
- Department of Chemistry
- University of North Bengal
- Darjeeling 734013
- India
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14
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Liu C, Xu J, Wu G. Au-Catalyzed intermolecular (3 + 2 + 1) and (5 + 2) cycloaddition for the synthesis of 1,4-dioxenes and 4,7-dihydrooxepines. Chem Commun (Camb) 2020; 56:12993-12996. [PMID: 32996972 DOI: 10.1039/d0cc05059h] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
1,4-Dioxenes and 4,7-dihydrooxepines present interesting potential as motifs for the incorporation of biologically relevant molecules, agrochemicals and materials. In this study, two efficient intermolecular (3 + 2 + 1) and (5 + 2) cycloadditions for the synthesis of 1,4-dioxenes and 4,7-dihydrooxepines are achieved with gold catalysis.
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Affiliation(s)
- Congrong Liu
- School of Environment Engineering, Nanjing Institute of Technology, 1 Hongjingdadao, Nanjing, Jiangsu 211167, China.
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15
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Mathavan S, B. R. D. Yamajala R. Sustainable Synthetic Approaches for 3‐Aminoimidazo‐fused Heterocycles viaGroebke‐Blackburn‐Bienaymé Process. ChemistrySelect 2020. [DOI: 10.1002/slct.202002894] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Sivagami Mathavan
- Department of chemistry, School of Chemical & Biotechnology SASTRA Deemed University Thanjavur 613401 India
| | - Rajesh B. R. D. Yamajala
- Department of chemistry, School of Chemical & Biotechnology SASTRA Deemed University Thanjavur 613401 India
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16
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Palladium and Copper Catalyzed Sonogashira cross Coupling an Excellent Methodology for C-C Bond Formation over 17 Years: A Review. Catalysts 2020. [DOI: 10.3390/catal10040443] [Citation(s) in RCA: 58] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
Sonogashira coupling involves coupling of vinyl/aryl halides with terminal acetylenes catalyzed by transition metals, especially palladium and copper. This is a well known reaction in organic synthesis and plays a role in sp2-sp C-C bond formations. This cross coupling was used in synthesis of natural products, biologically active molecules, heterocycles, dendrimers, conjugated polymers and organic complexes. This review paper focuses on developments in the palladium and copper catalyzed Sonogashira cross coupling achieved in recent years concerning substrates, different catalyst systems and reaction conditions.
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17
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Petko D, Koh S, Tam W. Transition Metal-Catalyzed Reactions of Alkynyl Halides. Curr Org Synth 2020; 16:546-582. [PMID: 31984930 DOI: 10.2174/1570179416666190329200616] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2018] [Revised: 02/08/2019] [Accepted: 02/20/2019] [Indexed: 11/22/2022]
Abstract
BACKGROUND Transition metal-catalyzed reactions of alkynyl halides are a versatile means of synthesizing a wide array of products. Their use is of particular interest in cycloaddition reactions and in constructing new carbon-carbon and carbon-heteroatom bonds. Transition metal-catalyzed reactions of alkynyl halides have successfully been used in [4+2], [2+2], [2+2+2] and [3+2] cycloaddition reactions. Many carbon-carbon coupling reactions take advantage of metal-catalyzed reactions of alkynyl halides, including Cadiot-Chodkiewicz, Suzuki-Miyaura, Stille, Kumada-Corriu and Inverse Sonogashira reactions. All the methods of constructing carbon-nitrogen, carbon-oxygen, carbon-phosphorus, carbon-sulfur, carbon-silicon, carbon-selenium and carbon-tellurium bonds employed alkynyl halides. OBJECTIVE The purpose of this review is to highlight and summarize research conducted in transition metalcatalyzed reactions of alkynyl halides in recent years. The focus will be placed on cycloaddition and coupling reactions, and their scope and applicability to the synthesis of biologically important and industrially relevant compounds will be discussed. CONCLUSION It can be seen from the review that the work done on this topic has employed the use of many different transition metal catalysts to perform various cycloadditions, cyclizations, and couplings using alkynyl halides. The reactions involving alkynyl halides were efficient in generating both carbon-carbon and carbonheteroatom bonds. Proposed mechanisms were included to support the understanding of such reactions. Many of these reactions face retention of the halide moiety, allowing additional functionalization of the products, with some new products being inaccessible using their standard alkyne counterparts.
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Affiliation(s)
- Dina Petko
- Guelph-Waterloo Center for Graduate Work in Chemistry and Biochemistry, Department of Chemistry, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - Samuel Koh
- Guelph-Waterloo Center for Graduate Work in Chemistry and Biochemistry, Department of Chemistry, University of Guelph, Guelph, Ontario N1G 2W1, Canada
| | - William Tam
- Guelph-Waterloo Center for Graduate Work in Chemistry and Biochemistry, Department of Chemistry, University of Guelph, Guelph, Ontario N1G 2W1, Canada
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18
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Li X, Wang S, Zang J, Liu M, Jiang G, Ji F. Copper- and DMF-mediated switchable oxidative C–H cyanation and formylation of imidazo[1,2-a]pyridines using ammonium iodide. Org Biomol Chem 2020; 18:9100-9108. [DOI: 10.1039/d0ob01838d] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
The cyanation and formylation of imidazo[1,2-a]pyridines were developed under copper-mediated oxidative conditions using ammonium iodide and DMF as a nontoxic combined cyano-group source and DMF as a formylation reagent.
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Affiliation(s)
- Xuan Li
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials
- College of Chemistry and Bioengineering
- Guilin University of Technology
- Guilin 541004
- P. R. China
| | - Shoucai Wang
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials
- College of Chemistry and Bioengineering
- Guilin University of Technology
- Guilin 541004
- P. R. China
| | - Jiawang Zang
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials
- College of Chemistry and Bioengineering
- Guilin University of Technology
- Guilin 541004
- P. R. China
| | - Meichen Liu
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials
- College of Chemistry and Bioengineering
- Guilin University of Technology
- Guilin 541004
- P. R. China
| | - Guangbin Jiang
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials
- College of Chemistry and Bioengineering
- Guilin University of Technology
- Guilin 541004
- P. R. China
| | - Fanghua Ji
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials
- College of Chemistry and Bioengineering
- Guilin University of Technology
- Guilin 541004
- P. R. China
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19
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Wang S, Zhang S, Liu M, Zang J, Jiang G, Ji F. Palladium-catalyzed C3-selective C–H oxidative carbonylation of imidazo[1,2-a]pyridines with CO and alcohols: a way to access esters. Org Chem Front 2020. [DOI: 10.1039/d0qo00003e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A palladium-catalyzed C3-selective C–H oxidative carbonylation for the synthesis of various esters from imidazo[1,2-a]pyridines and CO with high efficiency and high atom economy has been developed.
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Affiliation(s)
- Shoucai Wang
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials
- College of Chemistry and Bioengineering
- Guilin University of Technology
- Guilin 541004
- People's Republic of China
| | - Siyu Zhang
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials
- College of Chemistry and Bioengineering
- Guilin University of Technology
- Guilin 541004
- People's Republic of China
| | - Meichen Liu
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials
- College of Chemistry and Bioengineering
- Guilin University of Technology
- Guilin 541004
- People's Republic of China
| | - Jiawang Zang
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials
- College of Chemistry and Bioengineering
- Guilin University of Technology
- Guilin 541004
- People's Republic of China
| | - Guangbin Jiang
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials
- College of Chemistry and Bioengineering
- Guilin University of Technology
- Guilin 541004
- People's Republic of China
| | - Fanghua Ji
- Guangxi Key Laboratory of Electrochemical and Magnetochemical Function Materials
- College of Chemistry and Bioengineering
- Guilin University of Technology
- Guilin 541004
- People's Republic of China
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20
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Makra Z, Puskás LG, Kanizsai I. A convenient approach for the preparation of imidazo[1,2-a]-fused bicyclic frameworks via IBX/NIS promoted oxidative annulation. Org Biomol Chem 2019; 17:9001-9007. [PMID: 31577318 DOI: 10.1039/c9ob01708a] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An IBX/NIS-induced intramolecular oxidative annulation of Mannich-type substrates is reported. This metal-free approach involving iodination, NH-oxidation, intramolecular C-N bond formation, and retro-Claisen-Schmidt sequence provides the construction of imidazo[1,2-a]pyridine, imidazo[1,2-a]pyrimidine as well as imidazo[1,2-a]pyrazine frameworks with yields up to 93%. In addition, a sequential one-pot process is also presented.
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Affiliation(s)
- Zsófia Makra
- AVIDIN Ltd., Alsó kikötő sor 11/D, Szeged, H-6726, Hungary.
| | | | - Iván Kanizsai
- AVIDIN Ltd., Alsó kikötő sor 11/D, Szeged, H-6726, Hungary.
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21
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Liu Y, Zhang Y, Sun J. Copper‐Promoted Annulation of Terminal Alkynes with 2‐Aminopyridines to Assemble 2‐Halogenated Imidazo[1,2‐
a
]pyridines. J Heterocycl Chem 2019. [DOI: 10.1002/jhet.3660] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Affiliation(s)
- Yun Liu
- School of Chemistry and Material ScienceJiangsu Normal University Xuzhou 221116 Jiangsu People's Republic of China
| | - Yuxuan Zhang
- School of Chemistry and Material ScienceJiangsu Normal University Xuzhou 221116 Jiangsu People's Republic of China
| | - Jinwei Sun
- Jiangsu Collaborative Innovation Center of Atmospheric Environment and Equipment Technology, Jiangsu Key Laboratory of Atmospheric Environment Monitoring and Pollution ControlNanjing University of Information Science & Technology Nanjing 210044 Jiangsu People's Republic of China
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22
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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.
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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
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23
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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.
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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
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24
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Samanta SK, Bera MK. Iodine mediated oxidative cross coupling of 2-aminopyridine and aromatic terminal alkyne: a practical route to imidazo[1,2-a]pyridine derivatives. Org Biomol Chem 2019; 17:6441-6449. [PMID: 31206121 DOI: 10.1039/c9ob00812h] [Citation(s) in RCA: 27] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
A novel, transition-metal free route leading to imidazo[1,2-a]pyridine derivatives via iodine mediated oxidative coupling between 2-aminopyridine and aromatic terminal alkyne has been demonstrated. This newly developed method discloses an operationally simple way for the construction of imidazoheterocycles. Commercially available antiulcer drug zolimidine may readily be synthesized employing this method.
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Affiliation(s)
- Surya Kanta Samanta
- Department of Chemistry, Indian Institute of Engineering Science and Technology (IIEST), Shibpur PO-Botanic Garden, Howrah-711 103, WB, India.
| | - Mrinal K Bera
- Department of Chemistry, Indian Institute of Engineering Science and Technology (IIEST), Shibpur PO-Botanic Garden, Howrah-711 103, WB, India.
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25
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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
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26
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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]
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27
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Liao Y, Huang B, Huang X, Cai M. Heterogeneous Copper-Catalyzed Cascade Three-Component Reaction Towards Imidazo[1,2-a]pyridines: Efficient and Practical One-Pot Synthesis of Alpidem. ChemistrySelect 2019. [DOI: 10.1002/slct.201900128] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Yang Liao
- Key Laboratory of Functional Small Organic Molecule; Ministry of Education and College of Chemistry & Chemical Engineering; Jiangxi Normal University; Nanchang 330022 China
| | - Bin Huang
- Key Laboratory of Functional Small Organic Molecule; Ministry of Education and College of Chemistry & Chemical Engineering; Jiangxi Normal University; Nanchang 330022 China
| | - Xue Huang
- Key Laboratory of Functional Small Organic Molecule; Ministry of Education and College of Chemistry & Chemical Engineering; Jiangxi Normal University; Nanchang 330022 China
| | - Mingzhong Cai
- Key Laboratory of Functional Small Organic Molecule; Ministry of Education and College of Chemistry & Chemical Engineering; Jiangxi Normal University; Nanchang 330022 China
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28
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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.
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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
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29
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Jismy B, Akssira M, Knez D, Guillaumet G, Gobec S, Abarbri M. Efficient synthesis and preliminary biological evaluations of trifluoromethylated imidazo[1,2-a]pyrimidines and benzimidazo[1,2-a]pyrimidines. NEW J CHEM 2019. [DOI: 10.1039/c9nj01982k] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
Fluoromethylated imidazo[1,2-a]pyrimidines and benzimidazo[1,2-a]pyrimidines were synthesized through Michael addition/intramolecular cyclization reaction by condensation of 2-amino imidazole derivatives with ethyl 4,4,4-trifluorobut-2-ynate and using C–O bond activation.
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Affiliation(s)
- Badr Jismy
- Laboratoire de Physico-Chimie des Matériaux et des Electrolytes pour l’Energie (PCM2E)
- EA 6299
- Avenue Monge Faculté des Sciences
- Parc de Grandmont
- 37200 Tours
| | - Mohamed Akssira
- Laboratoire de Chimie Physique & de Chimie Bioorganique
- URAC 22
- Université Hassan II de Casablanca
- 28800 Mohammedia
- Morocco
| | - Damijan Knez
- University of Ljubljana
- Faculty of Pharmacy
- 1000 Ljubljana
- Slovenia
| | - Gérald Guillaumet
- Institut de Chimie Organique et Analytique (ICOA)
- Université d’Orléans
- UMR CNRS 7311
- 45067 Orléans Cedex 2
- France
| | - Stanislav Gobec
- University of Ljubljana
- Faculty of Pharmacy
- 1000 Ljubljana
- Slovenia
| | - Mohamed Abarbri
- Laboratoire de Physico-Chimie des Matériaux et des Electrolytes pour l’Energie (PCM2E)
- EA 6299
- Avenue Monge Faculté des Sciences
- Parc de Grandmont
- 37200 Tours
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30
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Yu Y, Su Z, Cao H. Strategies for Synthesis of Imidazo[1,2-a
]pyridine Derivatives: Carbene Transformations or C−H Functionalizations. CHEM REC 2018; 19:2105-2118. [DOI: 10.1002/tcr.201800168] [Citation(s) in RCA: 31] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/02/2018] [Revised: 11/22/2018] [Indexed: 01/21/2023]
Affiliation(s)
- Yue Yu
- School of Chemistry and Chemical Engineering; Guangdong Pharmaceutical University; Zhongshan 528458 P.R. of China
| | - Zhengquan Su
- School of Public Health; Guangdong Pharmaceutical University; Guangzhou 510006 P.R. of China
| | - Hua Cao
- School of Chemistry and Chemical Engineering; Guangdong Pharmaceutical University; Zhongshan 528458 P.R. of China
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31
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Liu C, Xue Y, Ding L, Zhang H, Yang F. Au-Catalyzed Addition of Nucleophiles to Chloroalkynes: A Regio- and Stereoselective Synthesis of (Z
)-Alkenyl Chlorides. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801222] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Affiliation(s)
- Congrong Liu
- School of Environment Engineering; Nanjing Institute of Technology; 1 Hongjingdadao 211167 Nanjing Jiangsu China
| | - Yunbo Xue
- School of Environment Engineering; Nanjing Institute of Technology; 1 Hongjingdadao 211167 Nanjing Jiangsu China
| | - Lianghui Ding
- School of Environment Engineering; Nanjing Institute of Technology; 1 Hongjingdadao 211167 Nanjing Jiangsu China
| | - Haiyun Zhang
- School of Environment Engineering; Nanjing Institute of Technology; 1 Hongjingdadao 211167 Nanjing Jiangsu China
| | - Fulai Yang
- Department State Key Laboratory of Natural Medicines; Department of Organic Chemistry; China Pharmaceutical University; 210009 Nanjing P. R. China
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32
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Li Y, Huang S, Liao C, Shao Y, Chen L. Transition-metal-free access to 2-aminopyridine derivatives from 2-fluoropyridine and acetamidine hydrochloride. Org Biomol Chem 2018; 16:7564-7567. [PMID: 30288539 DOI: 10.1039/c8ob02129e] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Under catalyst-free conditions, an efficient method for the synthesis of 2-aminopyridine derivatives through the nucleophilic substitution and hydrolysis of 2-fluoropyridine and acetamidine hydrochloride has been developed. This amination uses inexpensive acetamidine hydrochloride as the ammonia source and has the advantages of a high yield, high chemoselectivity and wide substrate adaptability. The results suggest that other N-heterocycles containing fluorine substituents can also complete the reaction via these reaction conditions and yield the target products.
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Affiliation(s)
- Yibiao Li
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong Province 529090, China.
| | - Shuo Huang
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong Province 529090, China.
| | - Chunshu Liao
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong Province 529090, China.
| | - Yan Shao
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong Province 529090, China.
| | - Lu Chen
- School of Biotechnology and Health Sciences, Wuyi University, Jiangmen, Guangdong Province 529090, China.
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33
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Metal-free, base catalyzed oxidative amination and denitration reaction: Regioselective synthesis of 3-arylimidazo[1,2-a]pyridines. Tetrahedron Lett 2018. [DOI: 10.1016/j.tetlet.2018.08.024] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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34
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Yu W, Huang Y, Li J, Tang X, Wu W, Jiang H. Copper-Catalyzed Aerobic Oxidative [3+2] Annulation for the Synthesis of 5-Amino/Imino-Substituted 1,2,4-Thiadiazoles through C-N/N-S Bond Formation. J Org Chem 2018; 83:9334-9343. [PMID: 30020784 DOI: 10.1021/acs.joc.8b01292] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
A copper-catalyzed aerobic oxidative annulation reaction of 2-aminopyridine/amidine with isothiocyanate has been reported. This strategy involving C-N/N-S bond formations provides various 5-amino/imino-substituted 1,2,4-thiadiazole derivatives under a Cu/O2 catalytic system. This method has demonstrated high reactivity, mild reaction conditions, and a broad substrate scope. Furthermore, the synthetic utilities of the approach are demonstrated by further modifications.
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Affiliation(s)
- Wentao Yu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510640 , China
| | - Yubing Huang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510640 , China
| | - Jianxiao Li
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510640 , China
| | - Xiaodong Tang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510640 , China
| | - Wanqing Wu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510640 , China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, Guangdong Engineering Research Center for Green Fine Chemicals, School of Chemistry and Chemical Engineering , South China University of Technology , Guangzhou 510640 , China
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35
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Tang X, Wu W, Zeng W, Jiang H. Copper-Catalyzed Oxidative Carbon-Carbon and/or Carbon-Heteroatom Bond Formation with O 2 or Internal Oxidants. Acc Chem Res 2018; 51:1092-1105. [PMID: 29648789 DOI: 10.1021/acs.accounts.7b00611] [Citation(s) in RCA: 148] [Impact Index Per Article: 24.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Abstract
Selective oxidation, a fundamental organic transformation of critical importance, produces value-added products from simple organic molecules. This process is extensively used to incorporate heteroatoms into carbon-based molecules, where high-valent metal salts, hypervalent halogen reagents, and peroxides are widely used as oxidants. Oxidation reactions are extremely challenging because their selectivity is hard to control and/or they form significant quantities of unwanted waste derived from the stoichiometric oxidants. Undoubtedly, the utilization of green oxidants such as molecular oxygen (O2) or internal oxidants provides tunable oxidation abilities and produces no environmentally hazardous byproducts. Thus, synthetic chemists have devoted increasing attention to the utilization of green oxidants to obtain valuable products. Since the first industrial application of noble metal-catalyzed oxidation, i.e., Pd/Cu/O2-mediated Wacker oxidation, precious metal-catalyzed organic reactions have undergone significant development in both the laboratory and industry. However, the high cost and considerable toxicity of precious metals compel chemists to explore the catalytic activities of earth-abundant, first-row transition metals. Copper is abundant, easy to utilize, and relatively insensitive to water and air. Controllable access to Cu(0), Cu(I), Cu(II), and Cu(III) oxidation states ensures that copper can be applied as a tunable and multifunctional catalyst. Copper-catalyzed transformations involve single-electron transfer (SET), two-electron processes (TEPs) and even the cooperation of SET and TEPs. More importantly, in Cu/O2 catalytic systems, ligands, additives, and solvents can tune the oxidation state of copper from Cu(I) to Cu(III). As a result, the development of copper-catalyzed aerobic oxidative reactions is possible and desirable. Progress in these synthetic methods will enable breakthroughs in natural product synthesis, materials science, and bioorganic chemistry. This Account describes our efforts over the last several years to develop copper-catalyzed C-C or C-heteroatom bond formation reactions with oxygen or internal oxidants as the oxidant. We primarily focused on reaction with simple substrates, including cross-couplings, cycloadditions, cyclizations, and condensations. These transformations provide convenient and efficient strategies for constructing multiple bonds, such as C-C/C-O bonds, C-C/C-N bonds, and C-N/C-S bonds, in one pot. Various alkynes, furans, benzofurans, lactones, sulfones, thioethers, and nitrogen-containing heterocyclic compounds were synthesized with high selectivity and atom economy from abundant, commercially available and inexpensive starting materials. These methods were successfully applied to the construction of drug molecules and skeletons of natural products. Additionally, the designed control experiments and serendipitous observations have given us mechanistic insights into copper-catalyzed green oxidation. Uncovering the activity of copper-catalyzed green oxidation involving oxygen and oxime esters has allowed us to extend the scope of those green oxidation reactions. We believe that copper-catalyzed green oxidation transformations can be made even more eco-friendly and economical in the synthesis of valuable compounds.
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Affiliation(s)
- Xiaodong Tang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Wanqing Wu
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Wei Zeng
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
| | - Huanfeng Jiang
- Key Laboratory of Functional Molecular Engineering of Guangdong Province, School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou 510640, China
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36
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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.
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37
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Li J, Tang J, Wu Y, He Q, Yu Y. Transition-metal-free regioselective C-H halogenation of imidazo[1,2- a]pyridines: sodium chlorite/bromite as the halogen source. RSC Adv 2018; 8:5058-5062. [PMID: 35539548 PMCID: PMC9078039 DOI: 10.1039/c7ra12100h] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/03/2017] [Accepted: 01/23/2018] [Indexed: 12/11/2022] Open
Abstract
A facile transition-metal-free regioselective halogenation of imidazo[1,2-a]pyridines using sodium chlorite/bromite as the halogen source is presented. The reaction has provided an efficient method for the formation of C-Cl or C-Br bonds to synthesize 3-chloro or 3-bromo-imidazo[1,2-a]pyridines which were then efficiently transformed into imidazo[1,2-a]pyridine core π-systems by Suzuki-Miyaura reactions.
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Affiliation(s)
- Junxuan Li
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University Zhongshan 528458 P. R. China +86 760 88207939
| | - Jiayi Tang
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University Zhongshan 528458 P. R. China +86 760 88207939
| | - Yuanheng Wu
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University Zhongshan 528458 P. R. China +86 760 88207939
| | - Qiuxing He
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University Zhongshan 528458 P. R. China +86 760 88207939
| | - Yue Yu
- School of Chemistry and Chemical Engineering, Guangdong Pharmaceutical University Zhongshan 528458 P. R. China +86 760 88207939
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38
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Hou ZW, Mao ZY, Melcamu YY, Lu X, Xu HC. Electrochemical Synthesis of Imidazo-Fused N-Heteroaromatic Compounds through a C−N Bond-Forming Radical Cascade. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201711876] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Zhong-Wei Hou
- State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, and College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 P. R. China
| | - Zhong-Yi Mao
- State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, and College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 P. R. China
| | - Yared Yohannes Melcamu
- State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, and College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 P. R. China
| | - Xin Lu
- State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, and College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 P. R. China
| | - Hai-Chao Xu
- State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, and College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 P. R. China
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39
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Hou ZW, Mao ZY, Melcamu YY, Lu X, Xu HC. Electrochemical Synthesis of Imidazo-Fused N-Heteroaromatic Compounds through a C−N Bond-Forming Radical Cascade. Angew Chem Int Ed Engl 2018; 57:1636-1639. [DOI: 10.1002/anie.201711876] [Citation(s) in RCA: 128] [Impact Index Per Article: 21.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/19/2017] [Indexed: 11/06/2022]
Affiliation(s)
- Zhong-Wei Hou
- State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, and College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 P. R. China
| | - Zhong-Yi Mao
- State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, and College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 P. R. China
| | - Yared Yohannes Melcamu
- State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, and College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 P. R. China
| | - Xin Lu
- State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, and College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 P. R. China
| | - Hai-Chao Xu
- State Key Laboratory of Physical Chemistry of Solid Surfaces i ChEM, and College of Chemistry and Chemical Engineering; Xiamen University; Xiamen 361005 P. R. China
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40
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Tan J, Ni P, Huang H, Deng GJ. Metal- and base-free synthesis of imidazo[1,2-a]pyridines through elemental sulfur-initiated oxidative annulation of 2-aminopyridines and aldehydes. Org Biomol Chem 2018; 16:4227-4230. [DOI: 10.1039/c8ob00981c] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
An elemental sulfur-based metal- and base-free system enables oxidative imidazo[1,2-a]pyridine annulations.
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Affiliation(s)
- Jing Tan
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
| | - Penghui Ni
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
| | - Huawen Huang
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
| | - Guo-Jun Deng
- Key Laboratory for Green Organic Synthesis and Application of Hunan Province
- Key Laboratory of Environmentally Friendly Chemistry and Application of Ministry of Education
- College of Chemistry
- Xiangtan University
- Xiangtan 411105
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41
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Ramya PS, Angapelly S, Digwal CS, Yadav U, Babu BN, Kamal A. An efficient RuCl 3 ·H 2 O/I 2 catalytic system: A facile access to 3-aroylimidazo[1,2- a ]pyridines from 2-aminopyridines and chalcones. JOURNAL OF SAUDI CHEMICAL SOCIETY 2018. [DOI: 10.1016/j.jscs.2017.07.007] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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42
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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.
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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.
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43
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Wang C, Wang E, Chen W, Zhang L, Zhan H, Wu Y, Cao H. Substrate-Controlled Selectivity Switch in a Three-Component Reaction: A Ag-Catalyzed Strategy for the Synthesis of Functionalized Imidazoles. J Org Chem 2017; 82:9144-9153. [DOI: 10.1021/acs.joc.7b01781] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Changcheng Wang
- School of Chemistry and Chemical
Engineering, Guangdong Pharmaceutical University, Zhongshan, 528458, P. R. China
| | - Enming Wang
- School of Chemistry and Chemical
Engineering, Guangdong Pharmaceutical University, Zhongshan, 528458, P. R. China
| | - Weixin Chen
- School of Chemistry and Chemical
Engineering, Guangdong Pharmaceutical University, Zhongshan, 528458, P. R. China
| | - Lijuan Zhang
- School of Chemistry and Chemical
Engineering, Guangdong Pharmaceutical University, Zhongshan, 528458, P. R. China
| | - Haiying Zhan
- School of Chemistry and Chemical
Engineering, Guangdong Pharmaceutical University, Zhongshan, 528458, P. R. China
| | - Yuanheng Wu
- School of Chemistry and Chemical
Engineering, Guangdong Pharmaceutical University, Zhongshan, 528458, P. R. China
| | - Hua Cao
- School of Chemistry and Chemical
Engineering, Guangdong Pharmaceutical University, Zhongshan, 528458, P. R. China
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44
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Dwivedi V, Kumar R, Sharma K, Sridhar B, Reddy MS. Copper-Promoted Regioselective Intermolecular Diamination of Ynamides: Synthesis of Imidazo[1,2- a]pyridines. ACS OMEGA 2017; 2:2770-2777. [PMID: 31457615 PMCID: PMC6641143 DOI: 10.1021/acsomega.7b00426] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2017] [Accepted: 06/05/2017] [Indexed: 06/10/2023]
Abstract
A facile access to 3-heterosubstituted (3-oxazolidinonyl/indolyl/phenoxy) imidazo[1,2-a]pyridines from readily available 2-aminopyridines and electron-rich (internally activated) alkynes like ynamides/ynamines/ynol ethers is achieved via Cu(OTf)2-mediated intermolecular diamination under aerobic conditions. The reaction is highly regioselective, owing to internal electron bias, and thus led to a single regioisomer with heterosubstitution at C3.
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Affiliation(s)
- Vikas Dwivedi
- Medicinal
& Process Chemistry Division, CSIR-Central
Drug Research Institute, Sector 10, Jankipuram Extn, Sitapur Road, Lucknow 226031, India
| | - Ravi Kumar
- Medicinal
& Process Chemistry Division, CSIR-Central
Drug Research Institute, Sector 10, Jankipuram Extn, Sitapur Road, Lucknow 226031, India
- Academy
of Scientific and Innovative Research, New Delhi 110001, India
| | - Kavita Sharma
- National
Institute of Pharmaceutical Education and Research, Raebareli 229010, India
| | - Balasubramanian Sridhar
- X-Ray Crystallography Division and MCB Division, CSIR-IICT, Tarnaka, Hyderabad 500007, India
| | - Maddi Sridhar Reddy
- Medicinal
& Process Chemistry Division, CSIR-Central
Drug Research Institute, Sector 10, Jankipuram Extn, Sitapur Road, Lucknow 226031, India
- X-Ray Crystallography Division and MCB Division, CSIR-IICT, Tarnaka, Hyderabad 500007, India
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45
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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
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46
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Chung R, Vo A, Hein JE. Copper-Catalyzed Hydrogen/Iodine Exchange in Terminal and 1-Iodoalkynes. ACS Catal 2017. [DOI: 10.1021/acscatal.6b03515] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Ryan Chung
- Department
of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
| | - Anh Vo
- Department
of Chemistry and Chemical Biology, University of California, Merced, Merced, California 95343, United States
| | - Jason E. Hein
- Department
of Chemistry, The University of British Columbia, Vancouver, British Columbia V6T 1Z1, Canada
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47
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Abdel Hameed AM, Moustafa MS, Al-Mousawi SM, Awed RR, Sadek KU. An efficient and catalyst-free synthesis of N-arylidene-2-arylimidazo[1,2-a]pyridine-3-ylamine derivatives via Strecker reaction under controlled microwave heating. GREEN PROCESSING AND SYNTHESIS 2017; 6. [DOI: 10.1515/gps-2017-0019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/01/2023]
Abstract
AbstractAn efficient one-pot multicomponent reaction of 2-aminopyridine with aromatic aldehydes and either benzoyl cyanide or cyanamide in pyridine under controlled microwave heating afforded N-aryldene-2-arylimidazo[1,2-a]-pyridine-3-ylamine derivatives. The reaction is catalyst free and is of high atom economy.
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48
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Roslan II, Chuah GK, Jaenicke S. Switching of Regioselectivity in a Perfluorohexyl Iodide Mediated Synthesis of Phenylimidazo[1,2-a]pyridines. European J Org Chem 2017. [DOI: 10.1002/ejoc.201601586] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Irwan Iskandar Roslan
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 117543 Singapore
| | - Gaik-Khuan Chuah
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 117543 Singapore
| | - Stephan Jaenicke
- Department of Chemistry; National University of Singapore; 3 Science Drive 3 117543 Singapore
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49
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Dai C, Wang J, Deng S, Zhou C, Zhang W, Zhu Q, Tang X. Acid-mediated sulfonylation of arylethynylene bromides with sodium arylsulfinates: synthesis of (E)-1,2-bis(arylsulfonyl)ethylenes and arylacetylenic sulfones. RSC Adv 2017. [DOI: 10.1039/c7ra07105a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023] Open
Abstract
A solvent-dependent sulfonylation of arylethynylene bromides with sodium arylsulfinates to afford (E)-1,2-bis(arylsulfonyl)ethylenes and arylacetylenic sulfones is described.
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Affiliation(s)
- Chenshu Dai
- Guangdong Provincial Key Laboratory of New Drug Screening
- School of Pharmaceutical Sciences
- Southern Medical University
- Guangzhou 510515
- P. R. China
| | - Junqi Wang
- Guangdong Provincial Key Laboratory of New Drug Screening
- School of Pharmaceutical Sciences
- Southern Medical University
- Guangzhou 510515
- P. R. China
| | - Siqi Deng
- Guangdong Provincial Key Laboratory of New Drug Screening
- School of Pharmaceutical Sciences
- Southern Medical University
- Guangzhou 510515
- P. R. China
| | - Candong Zhou
- Guangdong Provincial Key Laboratory of New Drug Screening
- School of Pharmaceutical Sciences
- Southern Medical University
- Guangzhou 510515
- P. R. China
| | - Wenhe Zhang
- Guangdong Provincial Key Laboratory of New Drug Screening
- School of Pharmaceutical Sciences
- Southern Medical University
- Guangzhou 510515
- P. R. China
| | - Qiuhua Zhu
- Guangdong Provincial Key Laboratory of New Drug Screening
- School of Pharmaceutical Sciences
- Southern Medical University
- Guangzhou 510515
- P. R. China
| | - Xiaodong Tang
- Guangdong Provincial Key Laboratory of New Drug Screening
- School of Pharmaceutical Sciences
- Southern Medical University
- Guangzhou 510515
- P. R. China
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50
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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]
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