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Volpi G, Laurenti E, Rabezzana R. Imidazopyridine Family: Versatile and Promising Heterocyclic Skeletons for Different Applications. Molecules 2024; 29:2668. [PMID: 38893542 PMCID: PMC11173518 DOI: 10.3390/molecules29112668] [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: 05/03/2024] [Revised: 05/30/2024] [Accepted: 05/31/2024] [Indexed: 06/21/2024] Open
Abstract
In recent years, there has been increasing attention focused on various products belonging to the imidazopyridine family; this class of heterocyclic compounds shows unique chemical structure, versatile optical properties, and diverse biological attributes. The broad family of imidazopyridines encompasses different heterocycles, each with its own specific properties and distinct characteristics, making all of them promising for various application fields. In general, this useful category of aromatic heterocycles holds significant promise across various research domains, spanning from material science to pharmaceuticals. The various cores belonging to the imidazopyridine family exhibit unique properties, such as serving as emitters in imaging, ligands for transition metals, showing reversible electrochemical properties, and demonstrating biological activity. Recently, numerous noteworthy advancements have emerged in different technological fields, including optoelectronic devices, sensors, energy conversion, medical applications, and shining emitters for imaging and microscopy. This review intends to provide a state-of-the-art overview of this framework from 1955 to the present day, unveiling different aspects of various applications. This extensive literature survey may guide chemists and researchers in the quest for novel imidazopyridine compounds with enhanced properties and efficiency in different uses.
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Affiliation(s)
- Giorgio Volpi
- Department of Chemistry, University of Turin, Via Pietro Giuria 7, 10125 Torino, Italy; (E.L.)
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2
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Hooshmand SE, Amini Z, Shiri M, Al-Harrasi A. Synthesis and Fluorescence Properties of Imidazopyridine-Linked Coumarins via Tandem C(sp 2)-H Functionalization/Decarboxylation Reaction. J Fluoresc 2024; 34:1131-1137. [PMID: 37486561 DOI: 10.1007/s10895-023-03345-6] [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: 05/27/2023] [Accepted: 07/07/2023] [Indexed: 07/25/2023]
Abstract
A catalyst-, oxidant-free and green synthetic route for direct access to a series of novel imidazopyridine-linked coumarins has been devised through tandem C(sp2)-H functionalization/decarboxylation reaction in ethyl acetate as a sustainable medium. Moreover, the utilities of ensured products in further organic synthesis were conducted by Suzuki-Miyaura and Sonogashira cross-coupling reactions. The fluorescence characteristics of the produced molecules are appropriate, and the synthesized scaffolds could promisingly garner future attention in clinical diagnostics and bioimaging research.
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Affiliation(s)
- Seyyed Emad Hooshmand
- Department of Organic Chemistry, Faculty of Chemistry, Alzahra University, Vanak, Tehran, 1993893973, Iran
| | - Zahra Amini
- Department of Organic Chemistry, Faculty of Chemistry, Alzahra University, Vanak, Tehran, 1993893973, Iran
| | - Morteza Shiri
- Department of Organic Chemistry, Faculty of Chemistry, Alzahra University, Vanak, Tehran, 1993893973, Iran.
| | - Ahmed Al-Harrasi
- Natural and Medical Sciences Research Center, University of Nizwa, P. O. Box 33, Birkat Al Mauz, Nizwa, 616, Sultanate of Oman.
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3
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Gotgi NM, Jain JS, Pal R, Ghosh D. Electrochemical and photochemical reaction of isatins: a decade update. Org Biomol Chem 2024; 22:3352-3375. [PMID: 38607323 DOI: 10.1039/d4ob00202d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/13/2024]
Abstract
This review presents the latest progress in photochemical and electrochemical reactions involving isatins. Isatin and its functionalized scaffolds e.g., oxindoles, spirooxindoles, and quinolines are privileged heterocycles as they are largely present in several agrochemical, natural products, and pharmaceuticals. Thus, the functionalization of isatins using sustainable approaches, i.e., electro- and photochemical methods is of recent research interest worldwide. In this review, we have discussed most of the important reactions of isatins based on types of bond formation involved under electro- and photochemical conditions over the last decade. The reaction mechanism for each reaction has been discussed in detail to offer an inclusive guide to readers. Lastly, a summary of current challenges and the future outlook toward the development of effective electrochemical and photochemical methods for the reaction of isatins is also presented.
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Affiliation(s)
- Nandini M Gotgi
- Department of Chemistry, St Joseph's University, 36 Lalbagh Road, Shanthinagar, Bengaluru-560027, Karnataka, India.
| | - J Saurab Jain
- Department of Chemistry, St Joseph's University, 36 Lalbagh Road, Shanthinagar, Bengaluru-560027, Karnataka, India.
| | - Rita Pal
- Department of Chemistry, St Joseph's University, 36 Lalbagh Road, Shanthinagar, Bengaluru-560027, Karnataka, India.
| | - Debashis Ghosh
- Department of Chemistry, St Joseph's University, 36 Lalbagh Road, Shanthinagar, Bengaluru-560027, Karnataka, India.
- Department of Chemistry, St. Joseph's College (Autonomous), 36 Lalbagh Road, Shanthinagar, Bengaluru-560027, Karnataka, India
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4
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Mallick S, Mandal T, Kumari N, Roy L, De Sarkar S. Divergent Electrochemical Synthesis of Indoles through pK a Regulation of Amides: Synthetic and Mechanistic Insights. Chemistry 2024; 30:e202304002. [PMID: 38290995 DOI: 10.1002/chem.202304002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2023] [Revised: 01/15/2024] [Accepted: 01/30/2024] [Indexed: 02/01/2024]
Abstract
A divergent synthetic approach to access highly substituted indole scaffolds is illustrated. By virtue of a tunable electrochemical strategy, distinct control over the C-3 substitution pattern was achieved by employing two analogous 2-styrylaniline precursors. The chemoselectivity is governed by the fine-tuning of the acidity of the amide proton, relying on the appropriate selection of N-protecting groups, and assisted by the reactivity of the electrogenerated intermediates. Detailed mechanistic investigations based on cyclic voltametric experiments and computational studies revealed the crucial role of water additive, which assists the proton-coupled electron transfer event for highly acidic amide precursors, followed by an energetically favorable intramolecular C-N coupling, causing exclusive fabrication of the C-3 unsubstituted indoles. Alternatively, the implementation of an electrogenerated cationic olefin activator delivers the C-3 substituted indoles through the preferential nucleophilic nature of the N-acyl amides. This electrochemical approach of judicious selection of N-protecting groups to regulate pKa/E° provides an expansion in the domain of switchable generation of heterocyclic derivatives in a sustainable fashion, with high regio- and chemoselectivity.
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Affiliation(s)
- Samrat Mallick
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, India
| | - Tanumoy Mandal
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, India
| | - Nidhi Kumari
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, India
| | - Lisa Roy
- Institute of Chemical Technology Mumbai-IOC Odisha Campus, Bhubaneswar, Bhubaneswar, 751013, India
| | - Suman De Sarkar
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur, 741246, India
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5
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Mondal K, Ghosh P, Hajra A. An Electrochemical Oxo-amination of 2H-Indazoles: Synthesis of Symmetrical and Unsymmetrical Indazolylindazolones. Chemistry 2024; 30:e202303890. [PMID: 38147010 DOI: 10.1002/chem.202303890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2023] [Revised: 12/21/2023] [Accepted: 12/26/2023] [Indexed: 12/27/2023]
Abstract
We have established a supporting-electrolyte free electrochemical method for the synthesis of indazolylindazolones through oxygen reduction reaction (eORR) induced 1,3-oxo-amination of 2H-indazoles where 2H-indazole is used as both aminating agent as well as the precursor of indazolone. Moreover, we have merged indazolone and indazole to get unsymmetrical indazolylindazolones through direct electrochemical cross-dehydrogenative coupling (CDC). This exogenous metal-, oxidant- and catalyst-free protocol delivered a number of multi-functionalized products with high tolerance of diverse functional groups.
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Affiliation(s)
- Koushik Mondal
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India
| | - Payel Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India
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Li Y, He L, Qin H, Liu Y, Yang B, Xu Z, Yang D. A Facile Ugi/Ullmann Cascade Reaction to Access Fused Indazolo-Quinoxaline Derivatives with Potent Anticancer Activity. Molecules 2024; 29:464. [PMID: 38257377 PMCID: PMC10820152 DOI: 10.3390/molecules29020464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 01/10/2024] [Accepted: 01/16/2024] [Indexed: 01/24/2024] Open
Abstract
A facile methodology for the construction of a complex heterocycle indazolo-fused quinoxalinone has been developed via an Ugi four-component reaction (U-4CR) followed by an intramolecular Ullmann reaction. The expeditious process features an operationally simple approach, time efficiency, and a broad substrate scope. Biological activity was evaluated and demonstrated that compound 6e inhibits human colon cancer cell HCT116 proliferation with an IC50 of 2.1 μM, suggesting potential applications for developing a drug lead in medicinal chemistry.
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Affiliation(s)
- Yong Li
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, Chongqing University of Arts and Sciences, Chongqing 402160, China
- School of Chemistry and Chemical Engineering, Southwest University, Chongqing 400715, China
| | - Liujun He
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, Chongqing University of Arts and Sciences, Chongqing 402160, China
| | - Hongxia Qin
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, Chongqing University of Arts and Sciences, Chongqing 402160, China
| | - Yao Liu
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, Chongqing University of Arts and Sciences, Chongqing 402160, China
| | - Binxin Yang
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, Chongqing University of Arts and Sciences, Chongqing 402160, China
| | - Zhigang Xu
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, Chongqing University of Arts and Sciences, Chongqing 402160, China
| | - Donglin Yang
- College of Pharmacy, National & Local Joint Engineering Research Center of Targeted and Innovative Therapeutics, Chongqing University of Arts and Sciences, Chongqing 402160, China
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7
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Halder A, Maiti D, Dutta J, De Sarkar S. Electro-oxidative Synthesis of Unsymmetrical Alkyne-1,4-diones via Sequential Ring Formation and Cleavage. Org Lett 2023; 25:7578-7583. [PMID: 37812069 DOI: 10.1021/acs.orglett.3c03045] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/10/2023]
Abstract
Synthesis of unsymmetrical but-2-yne-1,4-diones is reported through oxidative alkyne translocation of readily accessible homopropargylic alcohols. The developed method consists of an unprecedented one-pot sequential electro-oxidative annulation-fragmentation-chemical selenoxide elimination process. Excellent functional group compatibility was observed, and an array of yne-1,4-diones were synthesized. Derivatization of the alkyne gave access to other valuable scaffolds. Detailed mechanistic studies through the isolation of key intermediates clarified the cascade transformation.
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Affiliation(s)
- Atreyee Halder
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, West Bengal India
| | - Debabrata Maiti
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, West Bengal India
| | - Jhilik Dutta
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, West Bengal India
| | - Suman De Sarkar
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, West Bengal India
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8
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Tali JA, Kumar G, Sharma BK, Rasool Y, Sharma Y, Shankar R. Synthesis and site selective C-H functionalization of imidazo-[1,2- a]pyridines. Org Biomol Chem 2023; 21:7267-7289. [PMID: 37655687 DOI: 10.1039/d3ob00849e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/02/2023]
Abstract
Imidazo[1,2-a]pyridine has attracted much interest in drug development because of its potent medicinal properties, therefore the discovery of novel methods for its synthesis and functionalization continues to be an exciting area of research. Although transition metal catalysis has fuelled the most significant developments, extremely beneficial metal-free approaches have also been identified. Even though pertinent reviews focused on imidazo[1,2-a]pyridine synthesis, properties (physicochemical and medicinal), and functionalization at the C3 position have been published, none of these reviews has focused on the outcomes obtained in the field of global ring functionalization. We wish here to describe a brief synthesis and an overview of all the functionalization reactions at each carbon atom, viz, C2, C3, C5, C6, C7 and C8 of this scaffold, divided into sections based on site-selectivity and the type of functionalization methods used.
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Affiliation(s)
- Javeed Ahmad Tali
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Gulshan Kumar
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Bhupesh Kumar Sharma
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Younis Rasool
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
| | - Yashika Sharma
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
| | - Ravi Shankar
- Natural Product and Medicinal Chemistry Division (NPMC), CSIR-Indian Institute of Integrative Medicine, Jammu-180001, India.
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad-201002, India
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9
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Baidya M, De Sarkar S. Synthesis of Quinoxalines through Cu-electrocatalytic Azidation/Annulation Cascade at Low Catalyst Loading. Org Lett 2023; 25:5896-5901. [PMID: 37515784 DOI: 10.1021/acs.orglett.3c02186] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/31/2023]
Abstract
A Cu-electrocatalytic azidation of N-aryl enamines and subsequent denitrogenative annulation for the construction of quinoxaline frameworks is reported. Only 0.5 mol % of copper(II) chloride was employed for this cascade transformation displaying excellent functional-group compatibility even with complex bioactive scaffolds. The efficient electro-oxidative protocol enables the use of NaN3 as the cheapest azide source. Detailed mechanistic experiments, cyclic voltammetry, and spectroscopic studies provided strong evidence for a dual role of the Cu catalyst in azidyl and iminyl radical generation steps.
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Affiliation(s)
- Mrinmay Baidya
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, West Bengal, India
| | - Suman De Sarkar
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur 741246, West Bengal, India
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Firuz ME, Rajai-Daryasarei S, Rominger F, Biglari A, Balalaie S. Mn-Mediated Direct Regioselective C-H Trifluoromethylation of Imidazopyridines and Quinoxalines. J Org Chem 2023. [PMID: 37471701 DOI: 10.1021/acs.joc.3c00621] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/22/2023]
Abstract
A simple and highly efficient strategy has been developed for direct C-H trifluoromethylation at C-3 of imidazopyridines and C-8 of quinoxalines with readily available Langlois reagent through KMnO4/AcOH system. This protocol showed broad substrate scope and afforded moderate-to-excellent yields of both products. It is the first report that the functionalization of quinoxalines occurred regioselectively at the C-8 position of quinoxalines. Mechanistic studies revealed that reaction proceeded via radical pathway.
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Affiliation(s)
- Mahdieh Esi Firuz
- Peptide Chemistry Research Institute, K. N. Toosi University of Technology, P.O. Box 15875-4416, Tehran 19697-64499, Iran
| | - Saideh Rajai-Daryasarei
- Peptide Chemistry Research Institute, K. N. Toosi University of Technology, P.O. Box 15875-4416, Tehran 19697-64499, Iran
| | - Frank Rominger
- Organisch-Chemisches Institut der Universität Heidelberg, Im Neuenheimer Feld 271, Heidelberg 69120, Germany
| | - Abbas Biglari
- Department of Chemistry, Institute for Advanced Studies in Basic Sciences (IASBS), Prof. Sobouti Boulevard, Zanjan 45137-66731, Iran
| | - Saeed Balalaie
- Peptide Chemistry Research Institute, K. N. Toosi University of Technology, P.O. Box 15875-4416, Tehran 19697-64499, Iran
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Bhati KS, Suwalka D, Verma VP, Jassal AK, Kumari N, Sharma S. Cell Voltage-Dependent Structural Dichotomy: Electrochemical C-H Acyloxylation and N-Acylation of 2 H-Indazoles. Org Lett 2023. [PMID: 37450634 DOI: 10.1021/acs.orglett.3c01649] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/18/2023]
Abstract
A simple and efficient electrochemical method that utilizes modulation of the cell voltage to cause structural alterations in 2H-indazole is introduced. This method enables the C-3 acyloxylation of 2H-indazole and promotes the transfer of the acyl group from C-3 to N-1, allowing the N-acylation of 2H-indazoles. Additionally, the application of the μ-electro flow reactor was demonstrated, showcasing its effectiveness in achieving gram-scale production of 3x within a short residence time.
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Affiliation(s)
- Kuldeep Singh Bhati
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur 313001, India
| | - Dinesh Suwalka
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur 313001, India
| | - Ved Prakash Verma
- Department of Chemistry, Banasthali University, Niwai-Jodhpuriya Road, Vanasthali 304022, India
| | - Amanpreet Kaur Jassal
- Department of Chemistry, U.G.C. Centre of Advanced Studies in Chemistry, Guru Nanak Dev University, Amritsar 143005, India
| | - Neetu Kumari
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur 313001, India
| | - Siddharth Sharma
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur 313001, India
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Baidya M, Dutta J, De Sarkar S. Electrochemical Organoselenium Catalysis for the Selective Activation of Alkynes: Easy Access to Carbonyl-pyrroles/oxazoles from N-Propargyl Enamines/Amides. Org Lett 2023; 25:3812-3817. [PMID: 37196050 DOI: 10.1021/acs.orglett.3c01355] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/19/2023]
Abstract
Intramolecular electro-oxidative addition of enamines or amides to nonactivated alkynes was attained to access carbonyl-pyrroles or -oxazoles from N-propargyl derivatives. Organoselenium was employed as the electrocatalyst, which played a crucial role as a π-Lewis acid and selectively activated the alkyne for the successful nucleophilic addition. The synthetic strategy permits a wide range of substrate scope up to 93% yield. Several mechanistic experiments, including the isolation of a selenium-incorporated intermediate adduct, enlighten the electrocatalytic pathway.
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Affiliation(s)
- Mrinmay Baidya
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur-741246, West Bengal, India
| | - Jhilik Dutta
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur-741246, West Bengal, India
| | - Suman De Sarkar
- Department of Chemical Sciences, Indian Institute of Science Education and Research Kolkata, Mohanpur-741246, West Bengal, India
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13
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Ghosh S, Majumder S, Ghosh D, Hajra A. Redox-neutral carbon-heteroatom bond formation under photoredox catalysis. Chem Commun (Camb) 2023. [PMID: 37171250 DOI: 10.1039/d3cc01873c] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Recently, visible-light-mediated photoredox catalysis has been emerging as one of the fastest growing fields in organic chemistry because of its low cost, easy availability and environmental benignness. In the past five years, a new yet challenging trend, visible-light-induced redox-neutral carbon-heteroatom bond formation reaction involving presumed radical intermediates, has been flourishing rapidly. Although mostly transition metal-based photoredox catalysts were reported, a few organophotoredox catalysts have also shown efficacy towards carbon-heteroatom bond formation reactions. This review intends to summarize the recent research progress in redox-neutral carbon-heteroatom bond formations based on active intermediate(s) involved under photoredox catalysis.
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Affiliation(s)
- Sumit Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
| | - Souvik Majumder
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
| | - Debashis Ghosh
- Department of Chemistry, St. Joseph's University, Bangalore 560027, Karnataka, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
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14
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Abstract
We have developed an electrochemical method for the direct C-H sulfonylation of aldehyde hydrazones using sodium sufinates as the sulfonylating agent under supporting electrolyte-free conditions. This straightforward sulfonylation strategy afforded a library of (E)-sufonylated hydrazones with high tolerance of various functional groups. The radical pathway of this reaction has been revealed by the mechanistic studies.
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Affiliation(s)
- Biswajit Sarkar
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Payel Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
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15
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Zhang L, Yan H, Fan Y, Luo X, Pan Y, Liu Y, Cai Y, Xia Q. Cu-Catalyzed Regioselective C-H Amination of 2 H-Indazoles for the Synthesis of Indazole-Containing Indazol-3(2 H)-ones. J Org Chem 2023; 88:5731-5744. [PMID: 36996408 DOI: 10.1021/acs.joc.3c00187] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/01/2023]
Abstract
A copper-catalyzed C3 amination of 2H-indazoles with 2H-indazoles and indazol-3(2H)-ones under mild conditions was developed. A series of indazole-containing indazol-3(2H)-one derivatives were produced in moderate to excellent yields. The mechanistic studies suggest that the reactions probably proceed through a radical pathway.
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Affiliation(s)
- Lina Zhang
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China
| | - Hang Yan
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China
| | - Yueyue Fan
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China
| | - Xiande Luo
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China
| | - Yingqiao Pan
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China
| | - Yishu Liu
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China
| | - Yuepiao Cai
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China
| | - Qinqin Xia
- School of Pharmaceutical Sciences, Wenzhou Medical University, Wenzhou 325035, China
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16
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Hu J, Wan H, Wang S, Yi H, Lei A. Electrochemical Thiocyanation/Cyclization Cascade to Access Thiocyanato-Containing Benzoxazines. Catalysts 2023. [DOI: 10.3390/catal13030631] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023] Open
Abstract
Due to the importance of SCN-containing heteroarenes, developing novel and green synthetic protocols for the synthesis of SCN-containing compounds has drawn much attention over the last decades. We reported here an electrochemical oxidative cyclization of ortho-vinyl aniline to access various SCN-containing benzoxazines. Mild conditions, an extra catalyst-free and oxidant-free system, and good tolerance for air highlight the application potential of this method.
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17
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Pal PP, Ghosh S, Hajra A. Recent advances in carbosilylation of alkenes and alkynes. Org Biomol Chem 2023; 21:2272-2294. [PMID: 36852639 DOI: 10.1039/d3ob00230f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2023]
Abstract
Alkene and alkyne difunctionalization is a flexible process that allows the construction of two functional groups simultaneously in one step. On the other hand, carbosilylation, an ingenious difunctionalization pathway to concurrently incorporate both a silyl group and an organic functional group (alkyl, (hetero)aryl, alkenyl, alkynyl and allenyl) across a carbon-carbon multiple-bond system, is achieving immense interest in recent days. This review article provides a decade's update on the discoveries and developments in the synthesis of carbosilylated products from two very important carbon-carbon unsaturated substrates, alkenes and alkynes.
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Affiliation(s)
- Prajna Paramita Pal
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
| | - Sumit Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
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18
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Ghosh S, Pyne P, Ghosh A, Choudhury S, Hajra A. Visible-light-induced cascade reaction: a sustainable approach towards molecular complexity. Org Biomol Chem 2023; 21:1591-1628. [PMID: 36723242 DOI: 10.1039/d2ob02062a] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Photoredox catalysis has demonstrated rapid evolution in the field of synthetic organic chemistry. On the other hand, the splendour of cascade reactions in providing complex molecular architectures renders them a cutting-edge research area. Therefore, the merging of photocatalysis with cascade synthesis brings out a synthetic paradigm with immense potential. The development of photocascade catalysis for a target molecule with a particular molecular skeleton and stereochemical framework presents certain challenges but provides a robust and environmentally benign synthetic alternative. This comprehensive review assembles all the accomplishments and highlights of visible-light-induced cascade reactions with literature coverage up to October 2022.
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Affiliation(s)
- Sumit Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India.
| | - Pranjal Pyne
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India.
| | - Anogh Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India.
| | - Swagata Choudhury
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India.
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India.
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19
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Priyanka, Rani P, Kiran, Sindhu J. Indolizine: A Promising Framework for Developing a Diverse Array of C−H Functionalized Hybrids. ChemistrySelect 2023. [DOI: 10.1002/slct.202203531] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Affiliation(s)
- Priyanka
- Department of Chemistry, COBS&H CCSHAU Hisar 125004 India
| | - Payal Rani
- Department of Chemistry, COBS&H CCSHAU Hisar 125004 India
| | - Kiran
- Department of Chemistry, COBS&H CCSHAU Hisar 125004 India
| | - Jayant Sindhu
- Department of Chemistry, COBS&H CCSHAU Hisar 125004 India
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20
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Singh D, Pramanik S, Maity S. Photocatalytic sequential C-H functionalization expediting acetoxymalonylation of imidazo heterocycles. Beilstein J Org Chem 2023; 19:666-673. [PMID: 37205129 PMCID: PMC10186259 DOI: 10.3762/bjoc.19.48] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Accepted: 05/09/2023] [Indexed: 05/21/2023] Open
Abstract
The importance of functionalized imidazo heterocycles has often been featured in several impactful research both from academia and industry. Herein, we report a direct C-3 acetoxymalonylation of imidazo heterocycles using relay C-H functionalization enabled by organophotocatalysis starring zinc acetate in the triple role of an activator, ion scavenger as well as an acetylating reagent. The mechanistic investigation revealed a sequential sp2 and sp3 C-H activation, followed by functionalization driven by zinc acetate coupled with the photocatalyst PTH. A variety of imidazo[1,2-a]pyridines and related heterocycles were explored as substrates along with several active methylene reagents, all generating the products with excellent yields and regioselectivity, thus confirming excellent functional group tolerability.
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Affiliation(s)
- Deepak Singh
- Department of Chemistry and Chemical Biology, Indian Institute of Technology (ISM) Dhanbad, JH 826004, India
| | - Shyamal Pramanik
- Department of Chemistry and Chemical Biology, Indian Institute of Technology (ISM) Dhanbad, JH 826004, India
| | - Soumitra Maity
- Department of Chemistry and Chemical Biology, Indian Institute of Technology (ISM) Dhanbad, JH 826004, India
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21
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Guo T, Bi L, Zhang M, Zhu CJ, Yuan LB, Zhao YH. Access to Sulfur-Containing Bisheterocycles through Base-Promoted Consecutive Tandem Cyclization/Sulfenylation with Elemental Sulfur. J Org Chem 2022; 87:16907-16912. [PMID: 36417664 DOI: 10.1021/acs.joc.2c02248] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
Abstract
A convenient and efficient tandem cyclization/sulfenylation of o-alkynyl-phenols/-anilines/enaminones for the synthesis of diverse sulfur-containing bisheterocycles has been developed using stable, odorless, and easy-to-handle elemental S8 as a building block under green chemistry conditions. Notably, a one-step simple base-mediated organic transformation affords a benzofuran (indole or chromone) ring and two C-S bonds. Attractive features of this methodology include the absence of a metal catalyst, mild conditions, good functional group tolerance, and valuable product structures.
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Affiliation(s)
- Tao Guo
- School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou, Henan 450001, P. R. China
| | - Lei Bi
- School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou, Henan 450001, P. R. China
| | - Miao Zhang
- Department of Pharmacy, Children's Hospital Affiliated to Zhengzhou University, Zhengzhou, Henan 450001, P. R. China
| | - Cong-Jun Zhu
- School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou, Henan 450001, P. R. China
| | - Li-Bo Yuan
- School of Chemistry and Chemical Engineering, Henan University of Technology, Zhengzhou, Henan 450001, P. R. China
| | - Yun-Hui Zhao
- School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan 411201, P. R. China
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22
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Zhan G, Zhao H, Li DA, Wu Y, Fang H, Peng C, Han B. Synthesis of 2,3-bifunctional imidazo[1,2-a]pyridines through cycloadditions of pyridinium ylides with N-cyano-4-methyl-N-phenylbenzenesulfonamide. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.154295] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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23
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Bhati KS, Nagar R, Malviya BK, Shukla M, Jassal AK, Verma VP, Yadav DK, Kumari N, Sharma S. Electrochemical Regioselective Sulfenylation of 2 H-Indazoles with Thiols in Batch and Continuous Flow. J Org Chem 2022; 87:13845-13855. [PMID: 36223646 DOI: 10.1021/acs.joc.2c01549] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A novel electrochemical cross-dehydrogenative C-S bond coupling of aryl thiols with 2H-indazole is reported. Thiol-functionalized 2H-indazoles were synthesized under catalyst-, oxidant-, and metal-free conditions with innocuous hydrogen as the sole byproduct at ambient temperature. Furthermore, continuous electrochemical flow conditions using a graphite/Ni flow cell were used to obtained 3-(arylthio)-2H-indazole compounds on a gram scale within the residence time of 39 min. Detailed mechanistic studies including control experiments and cyclic voltammetry are provided to support the radical-radical cross-coupling pathway.
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Affiliation(s)
- Kuldeep Singh Bhati
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur 313001, India
| | - Riya Nagar
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur 313001, India
| | | | - Monika Shukla
- Department of Chemistry, Banasthali University, Newai-Jodhpuriya Road, Vanasthali 304022, India
| | - Amanpreet Kaur Jassal
- Department of Chemistry, Indian Institute of Technology, Delhi 110016, New Delhi, India
| | - Ved Prakash Verma
- Department of Chemistry, Indian Institute of Technology, Delhi 110016, New Delhi, India
| | - Dinesh Kumar Yadav
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur 313001, India
| | - Neetu Kumari
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur 313001, India
| | - Siddharth Sharma
- Department of Chemistry, Mohanlal Sukhadia University, Udaipur 313001, India
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24
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Yang Z, Yu JT, Pan C. Recent advances in C-H functionalization of 2 H-indazoles. Org Biomol Chem 2022; 20:7746-7764. [PMID: 36178474 DOI: 10.1039/d2ob01463g] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
2H-Indazoles are one class of the most important nitrogen-containing heterocyclic compounds. The 2H-indazole motif is widely present in bioactive natural products and drug molecules that exhibit distinctive bioactivities. Therefore, much attention has been paid to access diverse 2H-indazole derivatives. Among them, the late-stage functionalization of 2H-indazoles via C-H activation is recognized as an efficient approach for increasing the complexity and diversity of 2H-indazole derivatives. In this review, we summarized recent achievements in the late-stage functionalization of 2H-indazoles, including the C3-functionalization of 2H-indazoles through transition metal-catalyzed C-H activation or a radical pathway, transition metal-catalyzed ortho C2'-H functionalization of 2H-indazoles and remote C-H functionalization at the benzene ring in 2H-indazoles.
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Affiliation(s)
- Zixian Yang
- School of Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China.
| | - Jin-Tao Yu
- School of Petrochemical Engineering, Changzhou University, Changzhou 213164, P. R. China.
| | - Changduo Pan
- School of Chemistry and Chemical Engineering, Jiangsu University of Technology, Changzhou 213001, P. R. China.
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25
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Mondal K, Ghosh S, Hajra A. Transition-metal-catalyzed ortho C-H functionalization of 2-arylquinoxalines. Org Biomol Chem 2022; 20:7361-7376. [PMID: 36107011 DOI: 10.1039/d2ob01119k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Recently, direct C-H bond activation and functionalization has become a prodigious and hot topic among synthetic organic chemists due to its step-economic nature and substantial synthetic versatility. On the other hand, quinoxaline, a fused bicycle of benzene and pyrazine, has omnipresent applications in medicinal-, industrial- and materials chemistry. The presence of the N-1 atom in 2-arylquinoxaline enables chelation formation with a metal catalyst leading to the formation of ortho-substituted products. In this review, all articles related to the ortho C-H bond functionalization of 2-arylquinoxalines published up to May 2022 are highlighted.
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Affiliation(s)
- Koushik Mondal
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
| | - Sumit Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
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26
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Zeng S, Fang S, Cai H, Wang D, Liu W, Hu X, Ruan Z, Sun P. Selenium‐Electrocatalytic Cyclization of 2‐Vinylanilides towards Indoles of Peptide Labeling. Chem Asian J 2022; 17:e202200762. [DOI: 10.1002/asia.202200762] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/21/2022] [Revised: 08/18/2022] [Indexed: 11/05/2022]
Affiliation(s)
- Shaogao Zeng
- Jinan University College of Pharmacy International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education 510632 Guangzhou CHINA
| | - Songlin Fang
- Jinan University College of Pharmacy International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education 510632 Guangzhou CHINA
| | - Haiping Cai
- Guangzhou Medical University School of Pharmaceutical Sciences and the Fifth Affiliated Hospital Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target 511436 Guangzhou CHINA
| | - Dong Wang
- Jinan University College of Pharmacy International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education 510632 Guangzhou CHINA
| | - Weiling Liu
- Jinan University College of Pharmacy International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education 510632 Guangzhou CHINA
| | - Xinwei Hu
- Guangzhou Medical University School of Pharmaceutical Sciences and the Fifth Affiliated Hospital Guangzhou Municipal and Guangdong Provincial Key Laboratory of Molecular Target 511436 Guangzhou CHINA
| | - Zhixiong Ruan
- Guangzhou Medical University School of Pharmaceutical Sciences Xinzao, Panyu District 511436 Guangzhou CHINA
| | - Pinghua Sun
- Jinan University College of Pharmacy International Cooperative Laboratory of Traditional Chinese Medicine Modernization and Innovative Drug Development of Chinese Ministry of Education 510632 Guangzhou CHINA
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27
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Recent Strategies in Transition-Metal-Catalyzed Sequential C–H Activation/Annulation for One-Step Construction of Functionalized Indazole Derivatives. Molecules 2022; 27:molecules27154942. [PMID: 35956893 PMCID: PMC9370621 DOI: 10.3390/molecules27154942] [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: 07/06/2022] [Revised: 07/28/2022] [Accepted: 07/29/2022] [Indexed: 11/17/2022] Open
Abstract
Designing new synthetic strategies for indazoles is a prominent topic in contemporary research. The transition-metal-catalyzed C–H activation/annulation sequence has arisen as a favorable tool to construct functionalized indazole derivatives with improved tolerance in medicinal applications, functional flexibility, and structural complexity. In the current review article, we aim to outline and summarize the most common synthetic protocols to use in the synthesis of target indazoles via a transition-metal-catalyzed C–H activation/annulation sequence for the one-step synthesis of functionalized indazole derivatives. We categorized the text according to the metal salts used in the reactions. Some metal salts were used as catalysts, and others may have been used as oxidants and/or for the activation of precatalysts. The roles of some metal salts in the corresponding reaction mechanisms have not been identified. It can be expected that the current synopsis will provide accessible practical guidance to colleagues interested in the subject.
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28
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Mishra NP, Mohapatra S, Das T, Nayak S. Imidazo[1,2‐a]pyridine as a promising scaffold for the development of antibacterial agents. J Heterocycl Chem 2022. [DOI: 10.1002/jhet.4534] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | - Tapaswini Das
- Department of Chemistry Ravenshaw University Cuttack India
| | - Sabita Nayak
- Department of Chemistry Ravenshaw University Cuttack India
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29
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Ghosh S, Pyne P, Ghosh A, Hajra A. Ortho C-H Functionalizations of 2-Aryl-2H-Indazoles. CHEM REC 2022; 22:e202200158. [PMID: 35866505 DOI: 10.1002/tcr.202200158] [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: 06/05/2022] [Revised: 07/06/2022] [Accepted: 07/07/2022] [Indexed: 11/10/2022]
Abstract
C-H Functionalization is ubiquitously considered as a powerful, efficient and handy tool for installing various functional groups in complex organic heterocycles in an easier and step-economic way. Similarly, indazole is endowed as a potent heterocycle and is eminent for its profound impact in biological, medicinal and industrial chemistry. In this scenario, C-H functionalization at the selective ortho position of 2-arylindazole in assistance of a metal catalyst is also becoming an appealing approach in synthetic organic chemistry. This review addressed the recent findings and developments on ortho C-H functionalization of 2-aryl-2H-indazazoles with literature coverage extending from 2018 to May 2022.
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Affiliation(s)
- Sumit Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
| | - Pranjal Pyne
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
| | - Anogh Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
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30
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Matsumura M, Tsukada K, Sugimoto K, Murata Y, Yasuike S. Synthesis of novel alkynyl imidazopyridinyl selenides: copper-catalyzed tandem selenation of selenium with 2-arylimidazo[1,2- a]pyridines and terminal alkynes. Beilstein J Org Chem 2022; 18:863-871. [PMID: 35957751 PMCID: PMC9344556 DOI: 10.3762/bjoc.18.87] [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: 04/30/2022] [Accepted: 07/05/2022] [Indexed: 12/04/2022] Open
Abstract
Alkynyl selenides have attracted considerable research interest recently, owing to their applications in the biological and pharmaceutical fields. The Cu-catalyzed tandem reaction for the synthesis of novel alkynyl imidazopyridinyl selenides is presented. A one-pot synthesis route afforded alkynyl imidazopyridinyl selenides in moderate to good yields. This was achieved by a two-step reaction between terminal alkynes and diimidazopyridinyl diselenides, generated from imidazo[1,2-a]pyridines and Se powder, using 10 mol % of CuI and 1,10-phenanthroline as the catalytic system under aerobic conditions. The C(sp2)–Se and C(sp)–Se bond-formation reaction can be performed in one-pot by using inexpensive and easy to handle Se powder as the Se source. The reaction proceeded with terminal alkynes having various substitutions, such as aryl, vinyl, and alkyl groups. The obtained alkynyl imidazopyridinyl selenide was found to undergo nucleophilic substitution reaction on Se atom using organolithium reagents and 1,3-dipolar azide–alkyne cycloaddition based on the alkyne moiety.
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Affiliation(s)
- Mio Matsumura
- School of Pharmaceutical Sciences, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan
| | - Kaho Tsukada
- School of Pharmaceutical Sciences, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan
| | - Kiwa Sugimoto
- School of Pharmaceutical Sciences, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan
| | - Yuki Murata
- School of Pharmaceutical Sciences, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan
| | - Shuji Yasuike
- School of Pharmaceutical Sciences, Aichi Gakuin University, 1-100 Kusumoto-cho, Chikusa-ku, Nagoya 464-8650, Japan
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31
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Li S, Li X, Wang T, Yang Q, Ouyang Z, Chen J, Zhai H, Li X, Cheng B. Electrochemical Decarboxylative Coupling of N‐Substituted Glycines under Air: Access to C3‐Aminomethylated Imidazo[1,2‐a]pyridines. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200339] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
| | | | | | | | | | | | - Hongbin Zhai
- Peking University Shenzhen Graduate School CHINA
| | - Xiao Li
- University of Science and Technology Liaoning CHINA
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32
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Ghosh D, Ghosh S, Ghosh A, Pyne P, Majumder S, Hajra A. Visible light-induced functionalization of indazole and pyrazole: a recent update. Chem Commun (Camb) 2022; 58:4435-4455. [PMID: 35294515 DOI: 10.1039/d2cc00002d] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/15/2023]
Abstract
Indazole and pyrazole are renowned as a prodigious class of heterocycles having versatile uses in medicinal as well as industrial chemistry. Considering sustainable approaches, recently, photocatalysis has become an indispensable tool in organic chemistry due to its application for the activation of small molecules and the use of a clean energy source. In this review, we have highlighted the use of metal-based photocatalysts, organic photoredox catalysts, energy transfer photocatalysts and electron-donor-acceptor complexes in the functionalization of indazole and pyrazole. This perspective is arranged based on the types of functionalization reactions on indazole and pyrazole. A detailed discussion regarding the reaction mechanism of each reaction is given to provide a comprehensive guide to the reader. Finally, a summary of existing challenges and the future outlook towards the development of efficient photocatalytic methods for functionalization of these heterocycles is also presented.
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Affiliation(s)
- Debashis Ghosh
- Department of Chemistry, St. Joseph's College (Autonomous), Bangalore 560027, Karnataka, India
| | - Sumit Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
| | - Anogh Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
| | - Pranjal Pyne
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
| | - Souvik Majumder
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India.
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33
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Recent advances in transition-metal-free C–H functionalization of imidazo[1,2-a]pyridines. GREEN SYNTHESIS AND CATALYSIS 2022. [DOI: 10.1016/j.gresc.2022.03.007] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022] Open
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34
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Bal A, Dinda TK, Mal P. A Mechanochemical Aliphatic Iodination (and Bromination) by Cascaded Cyclization. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202200046] [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)
- Ankita Bal
- NISER: National Institute of Science Education and Research School of Chemical Sciences INDIA
| | - Tarun Kumar Dinda
- NISER: National Institute of Science Education and Research School of Chemical Sciences INDIA
| | - Prasenjit Mal
- NISER Bhubaneswar School of Chemical Sciences PO Bhimpur-PadanpurVia JatniDistrict Khurda 752050 Bhubaneswar INDIA
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35
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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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36
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Majumder S, Ghosh S, Pyne P, Ghosh A, Ghosh D, Hajra A. Synthesis of Unsymmetrical Biheteroarenes via Dehydrogenative and Decarboxylative Coupling: a Decade Update. CHEM REC 2021; 22:e202100288. [PMID: 34970849 DOI: 10.1002/tcr.202100288] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 12/13/2021] [Accepted: 12/17/2021] [Indexed: 12/22/2022]
Abstract
The design and development of robust and efficient methods for installing one heterocycle with another is endowed as a ubiquitous and powerful synthetic strategy to access complex organic biheterocycles in recent days due to their pervasive applications in medicinal as well as material chemistry. This perspective presents an overview on the recent findings and developments for the synthesis of unsymmetrical biheteroarenes via dehydrogenative and decarboxylative couplings with literature coverage mainly extending from 2011 to 2021. For simplification of the readers, the article has been subcategorized based on the catalysts used in the reactions.
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Affiliation(s)
- Souvik Majumder
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
| | - Sumit Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
| | - Pranjal Pyne
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
| | - Anogh Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
| | - Debashis Ghosh
- Department of Chemistry, St. Joseph's College (Autonomous), Bangalore, 560027, Karnataka, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, India
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