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Del Vecchio A, Rosadoni E, Ballerini L, Cuzzola A, Lipparini F, Ronchi P, Guariento S, Biagetti M, Lessi M, Bellina F. Transition Metal-Driven Selectivity in Direct C-H Arylation of Imidazo[2,1-b]Thiazole. ChemistryOpen 2024:e202400180. [PMID: 39051713 DOI: 10.1002/open.202400180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2024] [Indexed: 07/27/2024] Open
Abstract
A selective direct arylation of the different Csp2-H bonds of imidazo[2,1-b]thiazole with (hetero) aryl halides can be achieved simply by switching from a palladium catalyst system to the use of stoichiometric amounts of copper. The observed selectivity, also rationalized by DFT calculations, can be explained by a change in the mechanistic pathways between electrophilic palladation and base-promoted C-H metalation.
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Affiliation(s)
- Antonio Del Vecchio
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi, 13, 56124, Pisa, Italy
| | - Elisabetta Rosadoni
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi, 13, 56124, Pisa, Italy
| | - Lorenzo Ballerini
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi, 13, 56124, Pisa, Italy
| | - Angela Cuzzola
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi, 13, 56124, Pisa, Italy
| | - Filippo Lipparini
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi, 13, 56124, Pisa, Italy
| | - Paolo Ronchi
- Chemistry Research and Drug Design, Chiesi Farmaceutici S.p.A, 43122, Parma, Italy
| | - Sara Guariento
- Chemistry Research and Drug Design, Chiesi Farmaceutici S.p.A, 43122, Parma, Italy
| | - Matteo Biagetti
- Chemistry Research and Drug Design, Chiesi Farmaceutici S.p.A, 43122, Parma, Italy
| | - Marco Lessi
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi, 13, 56124, Pisa, Italy
| | - Fabio Bellina
- Dipartimento di Chimica e Chimica Industriale, Università di Pisa, Via Giuseppe Moruzzi, 13, 56124, Pisa, Italy
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2
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Babu SA, P V V, Poulose S, Varughese S, John J. Copper-Catalyzed Annulation of Electrophilic Benzannulated Heterocycles with 2-Aminopyridine and 2-Aminoquinoline: Direct Access toward Polyring-Fused Imidazo[1,2- a]pyridines. J Org Chem 2023; 88:10027-10039. [PMID: 37433107 DOI: 10.1021/acs.joc.3c00849] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/13/2023]
Abstract
We have developed a direct method for the synthesis of polyring-fused imidazo[1,2-a]pyridines via a copper-catalyzed annulation of electrophilic benzannulated heterocycles with 2-aminopyridine and 2-aminoquinoline. From 3-nitroindoles and 2-aminopyridine, we could synthesize tetracenes, viz., indole-fused imidazo[1,2-a]pyridines, and by starting from 2-aminoquinoline, we could generate pentacenes, viz., indolo-imidazo[1,2-a]quinolines. In addition, we could also extend the methodology toward the synthesis of benzothieno-imidazo[1,2-a]pyridines starting from 3-nitrobenzothiophene. Furthermore, the basic photophysical properties of these synthesized heteroacenes were evaluated.
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Affiliation(s)
- Sheba Ann Babu
- Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Thiruvananthapuram 695019, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Varsha P V
- Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Thiruvananthapuram 695019, India
| | - Susanna Poulose
- Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Thiruvananthapuram 695019, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Sunil Varughese
- Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Thiruvananthapuram 695019, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
| | - Jubi John
- Chemical Sciences and Technology Division, CSIR-National Institute for Interdisciplinary Science and Technology (CSIR-NIIST), Thiruvananthapuram 695019, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad 201002, India
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3
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Asadi S, Zebarjad M, Mehrabi H. Synthesis of Highly Functionalized Imidazopyridine: A Simple One-Pot Three-Component Synthesis of 6-Hydroxy-5 -(3-Phenylimidazo[1,2- a]Pyridin-2-yl)-2-Thioxo-2, 3-Dihydropyrimidin-4(1H)-Ones. Polycycl Aromat Compd 2023. [DOI: 10.1080/10406638.2022.2161583] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Sara Asadi
- Department of Chemistry, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
| | - Maedeh Zebarjad
- Department of Chemistry, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
| | - Hossein Mehrabi
- Department of Chemistry, Vali-e-Asr University of Rafsanjan, Rafsanjan, Iran
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4
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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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5
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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.
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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
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Vuillermet F, Bourret J, Pelletier G. Synthesis of Imidazo[1,2-a]pyridines: Triflic Anhydride-Mediated Annulation of 2H-Azirines with 2-Chloropyridines. J Org Chem 2020; 86:388-402. [DOI: 10.1021/acs.joc.0c02148] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Frédéric Vuillermet
- Department of Chemical Sciences, Paraza Pharma Inc., 2525 avenue Marie-Curie, Saint-Laurent, Québec H4S 2E1, Canada
| | - Joanick Bourret
- Department of Chemical Sciences, Paraza Pharma Inc., 2525 avenue Marie-Curie, Saint-Laurent, Québec H4S 2E1, Canada
| | - Guillaume Pelletier
- Department of Chemical Sciences, Paraza Pharma Inc., 2525 avenue Marie-Curie, Saint-Laurent, Québec H4S 2E1, Canada
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7
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Cai XH, Zhang H, Guo H. Denitrative Coupling Reaction: A Powerful Synthetic Tool in Functional Transformation. CURR ORG CHEM 2019. [DOI: 10.2174/1385272823666190627114857] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Abstract
Nitro hydrocarbons as inexpensive, easily available, and relatively stable organic intermediates have aroused great attention in various functional group transformations over the past several decades. The electron-withdrawing action of the nitro group can act as a transient leaving group to efficiently transform into the other important functionalities. Nitro compounds are easily prepared through simple synthetic reactions from simple and facile starting substrates and provide an exciting opportunity for the synthesis of various valuable products. This account will review recent progress in the denitrative coupling reaction of nitroalkanes, nitroolefins, and nitroarenes under transition metalcatalyzed, transition metal-free, or visible light induced conditions.
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Affiliation(s)
- Xiao-hua Cai
- School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China
| | - Hongyan Zhang
- School of Chemical Engineering, Guizhou Minzu University, Guiyang 550025, China
| | - Hui Guo
- School of Pharmaceutical Sciences, Zhejiang University of Technology, Hangzhou 310014, China
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8
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Gupta A, Sasan S, Kour A, Nelofar N, Manikrao Mondhe D, Kapoor KK. Triarylimidazo[1,2- a]pyridine-8-carbonitriles: solvent-free synthesis and their anti-cancer evaluation. SYNTHETIC COMMUN 2019. [DOI: 10.1080/00397911.2019.1605445] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Annah Gupta
- Department of Chemistry, University of Jammu, Jammu, India
| | - Sonakshi Sasan
- Department of Chemistry, University of Jammu, Jammu, India
| | - Avneet Kour
- Cancer Pharmacology Division, CSIR-Indian Institute of Integrative Medicines, Jammu, India
| | | | - Dilip Manikrao Mondhe
- Cancer Pharmacology Division, CSIR-Indian Institute of Integrative Medicines, Jammu, India
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Sivappa R, Sammeta VR, Huang Y, Golen JA, Savinov SN. Facile synthesis of 3-substituted imidazo[1,2-a]pyridines through formimidamide chemistry. RSC Adv 2019; 9:29659-29664. [PMID: 35531553 PMCID: PMC9073381 DOI: 10.1039/c9ra05841a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2019] [Accepted: 09/03/2019] [Indexed: 11/28/2022] Open
Abstract
A facile entry to 3-aryl/alkenyl/alkynyl substituted imidazo[1,2-a]pyridines (3a–p, 6a–d & 9a–9e) has been developed from readily available benzyl/allyl/propargyl halides and 2-amino pyridines as substrates via formimidamide chemistry that is devoid of caustic or expensive reagents, such as transition metal complexes. Quantum chemical calculations performed to understand the underlying mechanism of the transformation revealed a preference for intramolecular Mannich-type addition over pericyclic 1,5-electrocyclization for the systems reported herein that enable a Baldwin allowed 5-exo-trig cyclization instead of a formally anti-Baldwin 5-endo-trig process. A facile entry to 3-substituted imidazo[1,2-a]pyridines from halides and 2-amino pyridines via formimidamide chemistry has been developed through a formal anti-Baldwin 5-endo-trig cyclization that becomes a thermally allowed 5-exo-trig cyclization.![]()
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Affiliation(s)
- Rasapalli Sivappa
- Department of Chemistry and Biochemistry
- University of Massachusetts
- USA
| | | | - Yanchang Huang
- Department of Chemistry and Biochemistry
- University of Massachusetts
- USA
| | - James A. Golen
- Department of Chemistry and Biochemistry
- University of Massachusetts
- USA
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Liu C, Zhao J, Qiao Y, Huang W, Rao Z, Gu Y. Selective synthesis of oxazoles and pyrazines from α-bromo-1-phenylethanone using a by-product-promoted strategy. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.10.071] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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