1
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Valla L, Pitrat D, Mulatier JC, Le Bahers T, Jeanneau E, Ali LMA, Nguyen C, Gary-Bobo M, Andraud C, Bretonnière Y. Imidazo[1,2- a]pyridine and Imidazo[1,5- a]pyridine: Electron Donor Groups in the Design of D-π-A Dyes. J Org Chem 2024; 89:8407-8419. [PMID: 38853362 DOI: 10.1021/acs.joc.4c00232] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2024]
Abstract
This work investigates the electron-donating capabilities of two 10-π electron nitrogen bridgehead bicyclic [5,6]-fused ring systems, imidazo[1,2-a]pyridine and imidazo[1,5-a]pyridine rings. Eight compounds with varying positions of electron-withdrawing moieties (TCF or DCI) coupled to the imidazopyridine ring were synthesized and studied. DCI-containing compounds (Ib-IVb) exhibited a purely dipolar nature with broad absorption bands, weak fluorescence, large Stokes shifts, and strong solvatochromism. In contrast, TCF-containing compounds (Ia-IVa) demonstrated diverse properties. Imidazo[1,2-a]pyridine derivatives Ia and IIa were purely dipolar, while imidazo[1,5-a]pyridine derivatives IIIa and IVa displayed a cyanine-like character with intense absorption and higher quantum yields of emission. The observed gradual red shift in optical properties with changing electron-donor groups (IIb < Ib < IIIb < IVb) and (IIa < Ia < IIIa < IVa) underscores the stronger electron-donor character of imidazo[1,5-a]pyridine compared to that of imidazo[1,2-a]pyridine. Furthermore, crystalline powders of imidazo[1,2-a]pyridine derivatives exhibited fluorescence despite minimal emission in solution. Two compounds (Ib and IVa) were successfully formulated into nanoparticles for potential in vivo imaging applications in zebrafish embryos.
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Affiliation(s)
- Léa Valla
- Laboratoire de Chimie de l'ENS de Lyon, Univ Lyon, ENS de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, 69342 Lyon, France
| | - Delphine Pitrat
- Laboratoire de Chimie de l'ENS de Lyon, Univ Lyon, ENS de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, 69342 Lyon, France
| | - Jean-Christophe Mulatier
- Laboratoire de Chimie de l'ENS de Lyon, Univ Lyon, ENS de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, 69342 Lyon, France
| | - Tangui Le Bahers
- Laboratoire de Chimie de l'ENS de Lyon, Univ Lyon, ENS de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, 69342 Lyon, France
- Institut Universitaire de France 5 Rue Descartes, Paris 75005, France
| | - Erwann Jeanneau
- Univ Lyon, Centre de Diffractométrie Henri Longchambon, Université Lyon I, 43 Boulevard du 11 Novembre 1918, 69622 Villeurbanne Cedex, France
| | - Lamiaa M A Ali
- IBMM, Univ Montpellier, CNRS, ENSCM, 1919 Route de Mende, 34293 Montpellier, France
| | - Christophe Nguyen
- IBMM, Univ Montpellier, CNRS, ENSCM, 1919 Route de Mende, 34293 Montpellier, France
| | - Magali Gary-Bobo
- IBMM, Univ Montpellier, CNRS, ENSCM, 1919 Route de Mende, 34293 Montpellier, France
| | - Chantal Andraud
- Laboratoire de Chimie de l'ENS de Lyon, Univ Lyon, ENS de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, 69342 Lyon, France
| | - Yann Bretonnière
- Laboratoire de Chimie de l'ENS de Lyon, Univ Lyon, ENS de Lyon, CNRS UMR 5182, Université Claude Bernard Lyon 1, 69342 Lyon, France
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2
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Wen L, Tan Q, Pi C, Yuan J, Zhang J, Mi X. Visible-light-mediated C-H amidation of imidazoheterocycles with N-amidopyridiniums. Org Biomol Chem 2024; 22:4647-4650. [PMID: 38787700 DOI: 10.1039/d4ob00461b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/26/2024]
Abstract
C-3 amidated imidazoheterocycles were synthesized via a visible light-promoted reaction of imidazoheterocycles with N-amidopyridinium salts catalyzed by 4CzIPN under mild conditions. For imidazoheterocycles and N-amidopyridinium salts with various substituents, the reaction proceeded smoothly to give the corresponding products in moderate to good yields. The reaction provides a new strategy for the synthesis of secondary amides with the imidazo[1,2-a]pyridine core.
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Affiliation(s)
- Lili Wen
- College of Pharmacy, Henan University of Chinese Medicine, Zhengzhou 450046, China.
| | - Qiannan Tan
- College of Pharmacy, Henan University of Chinese Medicine, Zhengzhou 450046, China.
| | - Chao Pi
- Henan Key Laboratory of Chemical Biology and Organic Chemistry, Key Laboratory of Applied Chemistry of Henan Universities, Green Catalysis Center, and College of Chemistry, Zhengzhou University, Zhengzhou 450052, China.
| | - Juan Yuan
- College of Pharmacy, Henan University of Chinese Medicine, Zhengzhou 450046, China.
| | - Jingyu Zhang
- College of Pharmacy, Henan University of Chinese Medicine, Zhengzhou 450046, China.
| | - Xia Mi
- College of Pharmacy, Henan University of Chinese Medicine, Zhengzhou 450046, China.
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3
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Monreal-Corona R, Stasyuk AJ, Solà M, Pla-Quintana A, Poater A. Unveiling the Reaction Mechanisms of the Synthesis and the Excited State Intramolecular Proton Transfer of 2-(2'-hydroxyphenyl)imidazo[1,2-a]pyridine. Chemphyschem 2024; 25:e202400069. [PMID: 38358389 DOI: 10.1002/cphc.202400069] [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: 01/27/2024] [Revised: 02/15/2024] [Accepted: 02/15/2024] [Indexed: 02/16/2024]
Abstract
Given its wide variety of applications in the pharmaceutical industry, the synthesis of imidazo[1,2-a]pyridines has been extensively studied since the beginning of the last century. Here, we disclose the mechanism for the synthesis of imidazo[1,2-a]pyridines by means of the Ortoleva-King reaction. We also reveal the reaction pathway leading to the formation of a iodinated byproduct, demonstrating the challenge of preventing the formation of such a byproduct because of the low energy barrier to access it. Moreover, quantum chemistry tools were employed to investigate the mechanism of intramolecular proton transfer in the excited state, and connections with aromaticity were explored.
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Affiliation(s)
- Roger Monreal-Corona
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, C/ Maria Aurèlia Capmany 69, 17003, Girona, Catalonia, Spain
| | - Anton J Stasyuk
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, C/ Maria Aurèlia Capmany 69, 17003, Girona, Catalonia, Spain
| | - Miquel Solà
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, C/ Maria Aurèlia Capmany 69, 17003, Girona, Catalonia, Spain
| | - Anna Pla-Quintana
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, C/ Maria Aurèlia Capmany 69, 17003, Girona, Catalonia, Spain
| | - Albert Poater
- Institut de Química Computacional i Catàlisi and Departament de Química, Universitat de Girona, C/ Maria Aurèlia Capmany 69, 17003, Girona, Catalonia, Spain
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4
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Tang X, Zhang Y, Sun C. Effect of external electric fields on the ESDPT process and photophysical properties of 1,8-dihydroxy-2-naphthaldehyde. Phys Chem Chem Phys 2024; 26:10439-10448. [PMID: 38502564 DOI: 10.1039/d3cp06175b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/21/2024]
Abstract
In this work, by capitalizing on the density functional theory (DFT) and the time-dependent density functional theory (TD-DFT) methods, it has been systematically studied that the excited state double intramolecular proton transfer (ESDPT) process and the photophysical properties of 1,8-dihydroxy-2-naphthaldehyde (DHNA) are affected by the distinct external electric fields (EEFs). The obtained intramolecular hydrogen bond (IHB) parameters containing bond lengths and angles, as well as infrared (IR) vibrational spectra demonstrate that IHB strength changes in the distinct EEFs. Moreover, not only do the potential energy surfaces (PESs) indicate that the ESDPT process of DHNA is stepwise, but also increasing the positive EEF results in a decrease in the energy barrier accordingly, while vice versa. The absorption and fluorescence spectra also undergo a corresponding red or blue shift in the EEF; for instance, when the EEF changes from +10 × 10-4 a.u. to +20 × 10-4 a.u., the fluorescence peak undergoes a blue shift from 602 nm to 513 nm in the keto2 form. In a nutshell, the ESDPT process of DHNA can be influenced by the EEF, which will serve as a reference in regulating and controlling proton transfer that causes luminescence.
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Affiliation(s)
- Xingzhu Tang
- College of Science, Northeast Forestry University, Harbin 150040, Heilongjiang, China.
| | - Yajie Zhang
- College of Science, Northeast Forestry University, Harbin 150040, Heilongjiang, China.
| | - Chaofan Sun
- College of Science, Northeast Forestry University, Harbin 150040, Heilongjiang, China.
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5
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Slavova S, Antonov L. Azaindolizine proton cranes attached to 7-hydroxyquinoline and 3-hydroxypyridine: a comparative theoretical study. Phys Chem Chem Phys 2024; 26:7177-7189. [PMID: 38349360 DOI: 10.1039/d3cp04635d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/23/2024]
Abstract
Theoretical design of several proton cranes, based on 7-hydroxyquinoline and 3-hydroxypyridine as proton-transfer frames, has been attempted using ground and excited-state density functional theory (DFT) calculations in various environments. Imidazo[1,2-a]pyridine, pyrazolo[1,5-a]pyridine and benzimidazole were considered as proton crane units. The proton crane action requires the existence of a single enol-like form in the ground state, which under excitation goes to the end keto-like one through a series of consecutive excited-state intramolecular proton transfers (ESIPT) and twisting steps with the participation of a crane unit, resulting in a long-range intramolecular proton transfer. The results suggest that 3-hydroxypyridine is not suitable for a proton-transfer frame and 8-(imidazo[1,2-a]pyridin-2-yl)quinolin-7-ol and 8-(pyrazolo[1,5-a]pyridin-2-yl)quinolin-7-ol behave as non-conjugated proton cranes, instead of tautomeric re-arrangement in the latter, which was thought to be possible.
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Affiliation(s)
- Sofia Slavova
- Institute of Electronics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria.
- Institute of General and Inorganic Chemistry, Bulgarian Academy of Sciences, 1113 Sofia, Bulgaria
| | - Liudmil Antonov
- Institute of Electronics, Bulgarian Academy of Sciences, 1784 Sofia, Bulgaria.
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6
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Lai D, Bhattacharjee S, Mandal S, Ghosh S, Sahoo P, Sinha S, Hajra A. Iodine(III)-promoted oxidative carbotrifluoromethylation of maleimides with imidazopyridines and Langlois' reagent. Chem Commun (Camb) 2024; 60:2232-2235. [PMID: 38315091 DOI: 10.1039/d3cc05889a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
A metal-free protocol for oxidative carbotrifluoromethylation of maleimides with imidazopyridines and Langlois' reagent has been developed using (diacetoxyiodo)benzene (PIDA) as an oxidant. This three-component strategy enables one-step construction of 3,4-disubstituted maleimides in good yields with high functional group tolerance. Both experimental and theoretical studies support the proposed radical reaction mechanism.
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Affiliation(s)
- Dipti Lai
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
- ISERC, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Suvam Bhattacharjee
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
| | - Saurodeep Mandal
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
| | - Sumit Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
- ISERC, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Prithidipa Sahoo
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
| | - Subrata Sinha
- ISERC, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Alakananda Hajra
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan, 731235, West Bengal, India.
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7
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Singh M, Malviya M, Yadav VB, Nikhil A, Gupta M. Synthesis of imidazole-fused nitrogen-bridgehead heterocycles catalysed by lipase and their antifungal and antimicrobial bioactivity. RSC Adv 2024; 14:5037-5044. [PMID: 38332786 PMCID: PMC10848895 DOI: 10.1039/d3ra07145f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2023] [Accepted: 01/18/2024] [Indexed: 02/10/2024] Open
Abstract
An effective approach for selective C-N bond formation for synthesising imidazo[1,2-a] pyridine-based heterocycles using porcine pancreatic lipase (PPL) as a biocatalyst has been devised. Under moderate conditions, a series of imidazo[1,2-a]pyridine-based heterocycle derivatives were synthesised with remarkable selectivity in good-to-excellent yields (89-95%). Further, the antimicrobial and antifungal activities of derivatives 3ha, 3ka, 3fa, 3hc, and 3eb were observed, and they were found to be biologically active in antimicrobial susceptibility tests for Gram-positive bacteria (Enterococcus faecalis ATCC 29212 and Staphylococcus auris ATCC 25923), Gram-negative bacteria (Escherichia coli ATCC 25922 and Pseudomonas aeruginosa ATCC 27853) and fungal strains (Candida albicans ATCC 90028 and Candida tropicalis ATCC 750).
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Affiliation(s)
- Manjit Singh
- Department of Chemistry, IIT (BHU) Varanasi India
| | | | - Vijay B Yadav
- Department of Chemistry, University of Allahabad India
| | | | - Munesh Gupta
- Department of Microbiology, IMS(BHU) Varanasi India
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8
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Paul S, Choudhuri T, Das S, Pratap R, Bagdi AK. Tunable Regioselective Allylic Alkylation/Iodination of Imidazoheterocycles in Water. J Org Chem 2024; 89:1492-1504. [PMID: 38215401 DOI: 10.1021/acs.joc.3c02091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2024]
Abstract
The switchable roles of allylic alcohol and molecular iodine as reagents and catalysts have been demonstrated in the regioselective allylic alkylation and iodination of imidazoheterocycles employing the mixture of allylic alcohol-I2. First, we have explored the catalytic activity of iodine for the allylation of imidazoheterocycles using allylic alcohol in an aqueous medium. The allylation of a library of imidazoheterocycles and other electron-rich heterocycles like indole, pyrazole, 4-hydroxy coumarin, and 6-amino uracil has been achieved by employing this methodology. The efficiency of the I2 catalyst for N-allylation of azoles has also been demonstrated. Next, we have shown that this mixture of allylic alcohol and I2 could be beneficial for the iodination of imidazoheterocycles under room temperature. Mechanistic studies indicate that the activation of allylic alcohol by molecular iodine took place probably through halogen bonding, and NMR studies show that the reaction did not proceed through allylic ether formation.
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Affiliation(s)
- Suvam Paul
- Department of Chemistry, University of Kalyani, Kalyani 741235, India
| | | | - Sourav Das
- Department of Chemistry, University of Kalyani, Kalyani 741235, India
| | - Ramendra Pratap
- Department of Chemistry, University of Delhi, New Delhi 110007, India
| | - Avik Kumar Bagdi
- Department of Chemistry, University of Kalyani, Kalyani 741235, India
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9
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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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10
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Kulmaczewski R, Halcrow MA. Iron(II) complexes of 2,6-bis(imidazo[1,2- a]pyridin-2-yl)pyridine and related ligands with annelated distal heterocyclic donors. Dalton Trans 2023; 52:14928-14940. [PMID: 37799008 DOI: 10.1039/d3dt02747c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/07/2023]
Abstract
Following a published synthesis of 2,6-bis(imidazo[1,2-a]pyridin-2-yl)pyridine (L1), treatment of α,α'-dibromo-2,6-diacetylpyridine with 2 equiv. 2-aminopyrimidine or 2-aminoquinoline in refluxing acetonitrile respectively gives 2,6-bis(imidazo[1,2-a]pyrimidin-2-yl)pyridine (L2) and 2,6-bis(imidazo[1,2-a]quinolin-2-yl)pyridine (L3). Solvated crystals of [Fe(L1)2][BF4]2 (1[BF4]2) and [Fe(L2)2][BF4]2 (2[BF4]2) are mostly high-spin, although one solvate of 1[BF4]2 undergoes thermal spin-crossover on cooling. The iron coordination geometry is consistently distorted in crystals of 2[BF4]2 which may reflect the influence of intramolecular, inter-ligand N⋯π interactions on the molecular conformation. Only 1 : 1 Fe : L3 complexes were observed in solution, or isolated in the solid state; a crystal structure of [FeBr(py)2L3]Br·0.5H2O (py = pyridine) is presented. A solvate crystal structure of high-spin [Fe(L4)2][BF4]2 (L4 = 2,6-di{quinolin-2-yl}pyridine; 4[BF4]2) is also described, which exhibits a highly distorted six-coordinate geometry with a helical ligand conformation. The iron(II) complexes are high-spin in solution at room temperature, but 1[BF4]2 and 2[BF4]2 undergo thermal spin-crossover equilibria on cooling. All the compounds exhibit a ligand-based emission in solution at room temperature. Gas phase DFT calculations mostly reproduce the spin state properties of the complexes, but show small anomalies attributed to intramolecular, inter-ligand dispersion interactions in the sterically crowded molecules.
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Affiliation(s)
- Rafal Kulmaczewski
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT.
| | - Malcolm A Halcrow
- School of Chemistry, University of Leeds, Woodhouse Lane, Leeds, UK LS2 9JT.
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11
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Dalkilic O, Turbedaroglu O, Lafzi F, Kilic H. Regioselective C3-H Alkylation of Imidazopyridines with Donor-Acceptor Cyclopropanes. J Org Chem 2023; 88:11834-11846. [PMID: 37535468 PMCID: PMC10443042 DOI: 10.1021/acs.joc.3c01122] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2023] [Indexed: 08/05/2023]
Abstract
Alkylated imidazopyridines are crucial structures for medicinal chemistry. Here, an efficient method for the C3-H alkylation of imidazopyridines was devised. Under Lewis acid-catalyzed conditions, reactions of imidazopyridines with different donor-acceptor cyclopropanes were carried out. Finally, 1,3-bisfunctionalizaton of donor-acceptor cyclopropanes was performed. In addition, synthesized C3-alkylated imidazopyridines are amenable for diverse synthetic applications.
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Affiliation(s)
| | | | - Ferruh Lafzi
- Department of Chemistry,
Faculty of Sciences, Atatürk University, Erzurum 25240, Türkiye
| | - Haydar Kilic
- Department of Chemistry,
Faculty of Sciences, Atatürk University, Erzurum 25240, Türkiye
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12
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Yosefdad S, Bayat M, Valadbeigi Y. Synthesis of polyfunctionalized imidazopyridine carbonitrile and pyridopyrimidine carbothioamide derivatives. MONATSHEFTE FUR CHEMIE 2023. [DOI: 10.1007/s00706-023-03051-w] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
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13
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Brandner L, Müller TJJ. Multicomponent synthesis of chromophores – The one-pot approach to functional π-systems. Front Chem 2023; 11:1124209. [PMID: 37007054 PMCID: PMC10065161 DOI: 10.3389/fchem.2023.1124209] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/14/2022] [Accepted: 01/26/2023] [Indexed: 03/19/2023] Open
Abstract
Multicomponent reactions, conducted in a domino, sequential or consecutive fashion, have not only considerably enhanced synthetic efficiency as one-pot methodology, but they have also become an enabling tool for interdisciplinary research. The highly diversity-oriented nature of the synthetic concept allows accessing huge structural and functional space. Already some decades ago this has been recognized for life sciences, in particular, lead finding and exploration in pharma and agricultural chemistry. The quest for novel functional materials has also opened the field for diversity-oriented syntheses of functional π-systems, i.e. dyes for photonic and electronic applications based on their electronic properties. This review summarizes recent developments in MCR syntheses of functional chromophores highlighting syntheses following either the framework forming scaffold approach by establishing connectivity between chromophores or the chromogenic chromophore approach by de novo formation of chromophore of interest. Both approaches warrant rapid access to molecular functional π-systems, i.e. chromophores, fluorophores, and electrophores for various applications.
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14
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Solvent-dependence of KI Mediated Electrosynthesis of Imidazo[1,2-a]pyridines. Chem Res Chin Univ 2023. [DOI: 10.1007/s40242-023-2323-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/21/2023]
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15
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Wang S, Chen Y, Chen D, Ye W, Yao L, Huang Z, Zhou Z. Synthesis, crystal structure and vibrational properties studies of (S)-N-(1-phenylethyl)-6-(4-(trifluoromethoxy)phenyl)imidazo[1,2-a]pyridine-2-carboxamide. J Mol Struct 2023. [DOI: 10.1016/j.molstruc.2022.134175] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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16
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Reddy Potuganti G, Kandula A, Vashishtha K, Reddy Indukuri D, Alla M. Copper Mediated Direct Amination: Synthesis of 1,2,3,15
a
‐tetrahydro‐14
H
‐pyrrolo[1,2‐
a
]quinazolino[3,2‐
c
]quinazolin‐14‐onederivatives
via
2‐(2‐bromophenyl)quinazolin‐4(3
H
)‐ones. ChemistrySelect 2022. [DOI: 10.1002/slct.202204173] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Gal Reddy Potuganti
- Division of Fluoro and Agrochemicals CSIR-Indian Institute of Chemical Technology Tarnaka Hyderabad, 500007 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Aravind Kandula
- Division of Fluoro and Agrochemicals CSIR-Indian Institute of Chemical Technology Tarnaka Hyderabad, 500007 India
| | - Kirti Vashishtha
- Division of Fluoro and Agrochemicals CSIR-Indian Institute of Chemical Technology Tarnaka Hyderabad, 500007 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Divakar Reddy Indukuri
- Division of Fluoro and Agrochemicals CSIR-Indian Institute of Chemical Technology Tarnaka Hyderabad, 500007 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
| | - Manjula Alla
- Division of Fluoro and Agrochemicals CSIR-Indian Institute of Chemical Technology Tarnaka Hyderabad, 500007 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad 201002 India
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17
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Chaudhran PA, Sharma A. Progress in the Development of Imidazopyridine-Based Fluorescent Probes for Diverse Applications. Crit Rev Anal Chem 2022:1-18. [PMID: 36562726 DOI: 10.1080/10408347.2022.2158720] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Different classes of Imidazopyridine i.e., Imidazo[1,2-a]pyridine, Imidazo[1,5-a] pyridine, Imidazo[4,5-b]pyridine, have shown versatile applications in various fields. In this review, we have concisely presented the usefulness of the fluorescent property of imidazopyridine in different fields such as imaging tools, optoelectronics, metal ion detection, etc. Fluorescence mechanisms such as excited state intramolecular proton transfer, photoinduced electron transfer, fluorescence resonance energy transfer, intramolecular charge transfer, etc. are incorporated in the designed fluorophore to make it for fluorescent applications. It has been widely employed for metal ion detection, where selective metal ion detection is possible with triazole-attached imidazopyridine, β-carboline imidazopyridine hybrid, quinoline conjugated imidazopyridine, and many more. Also, other popular applications involve organic light emitting diodes and cell imaging. This review shed a light on recent development in this area especially focusing on the optical properties of the molecules with their usage which would be helpful in designing application-based new imidazopyridine derivatives.
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Affiliation(s)
- Preeti AshokKumar Chaudhran
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research-Raebareli, Uttar Pradesh, India
| | - Abha Sharma
- Department of Medicinal Chemistry, National Institute of Pharmaceutical Education and Research-Raebareli, Uttar Pradesh, India
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18
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Liu Y, Wang Z, Lei T, Li Y. Ag(I)‐Promoted Decarboxylative Annulation of Alkynoic Acids towards 2‐Arylimidazo[1,2‐
a
]pyridines. ChemistrySelect 2022. [DOI: 10.1002/slct.202203605] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Affiliation(s)
- Yun Liu
- School of Chemistry and Material Science Jiangsu Normal University Xuzhou 221116 Jiangsu P. R. China
| | - Ziqing Wang
- School of Chemistry and Material Science Jiangsu Normal University Xuzhou 221116 Jiangsu P. R. China
| | - Ting Lei
- School of Chemistry and Material Science Jiangsu Normal University Xuzhou 221116 Jiangsu P. R. China
| | - Yuling Li
- School of Chemistry and Material Science Jiangsu Normal University Xuzhou 221116 Jiangsu P. R. China
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19
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Nickel/iodine-catalyzed synthesis of 2-arylimidazo[1,2-a]pyridines through Ortoleva-King type protocol. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100750] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022] Open
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20
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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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21
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Blockade of persistent colored isomer formation in photochromic 3H-naphthopyrans by excited-state intramolecular proton transfer. Sci Rep 2022; 12:19159. [DOI: 10.1038/s41598-022-23759-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2022] [Accepted: 11/04/2022] [Indexed: 11/11/2022] Open
Abstract
AbstractIn photochemistry the excited-state intramolecular proton transfer process (ESIPT) is often observed as a highly efficient singlet excited state depletion pathway, which in the presence of a strong intramolecular hydrogen bond may proceed on a subpicosecond time scale. The present work describes the suppression of unwanted transoid-trans isomer formation in photochromic 3H-naphthopyran derivatives by the introduction of a 5-hydroxy substituent. According to time-resolved spectroscopy experiments and excited-state ab initio calculations, transoid-cis → transoid-trans photoisomerization is reduced by a competitive ESIPT channel in nonpolar solvent (cyclohexane). Upon specific solute–solvent interactions (methanol, acetonitrile) the intramolecular hydrogen bond in the transoid-cis form is perturbed, favoring the internal conversion S1 → S0 process as photostabilizing channel.
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22
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Sathish E, Gupta AK, Deeksha, Mishra SK, Sawant DM, Singh R. Heteroarylation of Congested α-Bromoamides with Imidazo-Heteroarenes and Indolizines via Aza-Oxyallyl Cations: Enroute to Dibenzoazepinone and Zolpidem Analogues. J Org Chem 2022; 87:14168-14176. [PMID: 36260747 DOI: 10.1021/acs.joc.2c01708] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Herein, we report a highly efficient and unprecedented approach for heteroarylation of congested α-bromoamides via electrophilic aromatic substitution of imidazo-heteroarenes and indolizines under mild reaction conditions (room temperature, metal, and oxidant free). The participation of an in situ generated aza-oxyallyl cation as an alkylating agent is the hallmark of this transformation. The method was readily adapted to synthesize novel imidazo-heteroarene-fused dibenzoazepinone architectures of potential medicinal value.
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Affiliation(s)
- Elagandhula Sathish
- School of Chemical Sciences and Pharmacy, Central University of Rajasthan, Ajmer, Rajasthan305817, India
| | - Ashis Kumar Gupta
- School of Chemical Sciences and Pharmacy, Central University of Rajasthan, Ajmer, Rajasthan305817, India
| | - Deeksha
- School of Chemical Sciences and Pharmacy, Central University of Rajasthan, Ajmer, Rajasthan305817, India
| | - Sandeep Kumar Mishra
- Department of Physics and NMR Research Center, Indian Institute of Science Education and Research, 411008Pune, India
| | - Devesh M Sawant
- School of Chemical Sciences and Pharmacy, Central University of Rajasthan, Ajmer, Rajasthan305817, India
| | - Ritesh Singh
- School of Chemical Sciences and Pharmacy, Central University of Rajasthan, Ajmer, Rajasthan305817, India
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23
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Solvent-controlled photosensitized divergent C3-ethoxycarbonylmethylation/hydroxyalkylation of imidazo[1,2-a]pyridines with diethyl bromomalonate. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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24
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Dai PF, Xu H. Novel Chlorination of Imidazo‐Fused Heterocycles via Dichloro(aryl)‐λ3‐iodanes. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200779] [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)
- Peng-Fei Dai
- First Affiliated Hospital of Anhui Medical University Department of Nuclear Medicine 218 Jixi Road 230022 Hefei CHINA
| | - Huiqin Xu
- First Affiliated Hospital of Anhui Medical University Department of Nuclear Medicine 230022 NanJing CHINA
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25
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Prajapati RV, Prajapati VD, Purohit VB, Avalani JR, Kamani RD, Sapariya NH, Karad SC, Raval DK. Microwave‐Assisted Palladium‐catalyzed double C−H Activation: One‐pot Synthesis of Benzo[
a
]imidazo[5,1,2‐
cd
]indolizines from 2‐Phenylimidazo[1,2‐
a
]pyridines and 1,2‐Diiodobenzene. ChemistrySelect 2022. [DOI: 10.1002/slct.202201436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Ronak V. Prajapati
- Department of Chemistry Sardar Patel University Vallabh Vidyanagar- 388120 Gujarat India
| | - Vaibhav D. Prajapati
- Department of Chemistry Sardar Patel University Vallabh Vidyanagar- 388120 Gujarat India
| | - Vishal B. Purohit
- Shri A. N. Patel P. G. Institute of Science & Research Anand 388001 Gujarat India
- Current Affiliation: International Centre for Research on Innovative Biobased Materials (ICRI-BioM)- International Research Agenda Lodz University of Technology Zeromskiego 116 90-924 Lodz Poland
| | - Jemin R. Avalani
- Shri A. N. Patel P. G. Institute of Science & Research Anand 388001 Gujarat India
| | - Ronak D. Kamani
- Department of Chemistry Sardar Patel University Vallabh Vidyanagar- 388120 Gujarat India
| | - Nirav H. Sapariya
- Natubhai V. Patel College of Pure and Applied Sciences CVM University, Vallabh Vidyanagar- 388120 Gujarat India
| | - Sharad C. Karad
- Department of Chemistry Sardar Patel University Vallabh Vidyanagar- 388120 Gujarat India
| | - Dipak K. Raval
- Department of Chemistry Sardar Patel University Vallabh Vidyanagar- 388120 Gujarat India
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26
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Sharma M, Prasher P. C2-functionalized imidazo[1,2-a]pyridine: Synthesis and medicinal relevance. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2022.2079091] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Mousmee Sharma
- Department of Chemistry, Uttaranchal University, Dehradun, India
| | - Parteek Prasher
- Department of Chemistry, University of Petroleum and Energy Studies, Dehradun, India
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27
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Acharya S, Bhaumick P, Kumar R, Choudhury LH. Iodine-Catalyzed Multicomponent Synthesis of Highly Fluorescent Pyrimidine-Linked Imidazopyridines. ACS OMEGA 2022; 7:18660-18670. [PMID: 35694517 PMCID: PMC9178772 DOI: 10.1021/acsomega.2c01332] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 03/05/2022] [Accepted: 04/20/2022] [Indexed: 06/15/2023]
Abstract
Herein, we report a metal-free one-pot three-component reaction of aryl methyl ketones, 2-aminopyridines, and barbituric acids for the synthesis of pyrimidine-linked imidazopyridines using a catalytic amount of molecular iodine in DMSO medium. This process involves a one-pot C-H oxidation, followed by the formation of one C-C and two C-N bonds. A wide variety of aryl methyl ketones and 2-aminopyridines were found to be suitable for this methodology. The UV and fluorescence properties of the synthesized products were studied in water and DMSO media. Most of the synthesized products exhibited very good to excellent fluorescence quantum yield. Among all the products, compounds 4p and 4q showed the maximum fluorescence quantum yield (0.36) in water medium under basic conditions and compound 4c showed the maximum fluorescence quantum yield (0.75) in DMSO medium.
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Affiliation(s)
| | - Prabhas Bhaumick
- Department of Chemistry, Indian
Institute of Technology Patna, Patna 801106, India
| | - Rohit Kumar
- Department of Chemistry, Indian
Institute of Technology Patna, Patna 801106, India
| | - Lokman H. Choudhury
- Department of Chemistry, Indian
Institute of Technology Patna, Patna 801106, India
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28
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Thavaselvan S, Parthasarathy K. Nickel-catalyzed [2 + 2 + 2] benzannulation of alkynes: a new route to the synthesis of highly substituted naphthalenes. Org Biomol Chem 2022; 20:4309-4313. [PMID: 35583045 DOI: 10.1039/d2ob00513a] [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
The Ni(II)-catalyzed aromatic homologation of various directing groups with alkynes to afford highly substituted naphthalene products via C-X bond cleavage followed by alkyne insertion and C-H activation is described. This reaction proceeded with a wide range of directing groups such as pyrazoles, imidazopyridines, benzoimidazothiazoles, thiazoles and triazoles with alkynes to afford highly substituted naphthalenes in moderate to good yields. This transformation is promoted by a simple, straightforward combination of a Ni(II)-complex, Zn dust and a base.
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Affiliation(s)
- Sampath Thavaselvan
- Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai-600 025, Tamil Nadu, India.
| | - Kanniyappan Parthasarathy
- Department of Organic Chemistry, University of Madras, Guindy Campus, Chennai-600 025, Tamil Nadu, India.
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29
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Mal S, Jana M. Sulfonyl hydrazide induced sulfenylation of imidazoheteroarenes: A ‘catalyst and solvent free’ protocol. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2022.2069506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Sourav Mal
- Department of Chemistry, University of Kalyani, Nadia, India
| | - Manoranjan Jana
- Department of Chemistry, University of Kalyani, Nadia, India
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30
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Kumbhar VV, Khairnar BB, Chaskar MG, Pawar RA, Gugale GS. Synthetic strategies in development of 3-aroylimidazo[1,2-a]pyridines and 2-aroylimidazo[1,2-a]pyridines: A decade update. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2022.2056057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Vikrant V. Kumbhar
- Department of Chemistry, PDEA’s Prof. Ramkrishna More College, Pune, India
- Interdisciplinary School of Science (IDSS), Savitribai Phule Pune University, Pune, India
| | - Bhushan B. Khairnar
- Department of Chemistry, PDEA’s Prof. Ramkrishna More College, Pune, India
- Interdisciplinary School of Science (IDSS), Savitribai Phule Pune University, Pune, India
| | - Manohar G. Chaskar
- Department of Chemistry, PDEA’s Prof. Ramkrishna More College, Pune, India
| | - Ramdas A. Pawar
- Department of Chemistry, PDEA’s Prof. Ramkrishna More College, Pune, India
| | - Gulab S. Gugale
- Department of Chemistry, PDEA’s Prof. Ramkrishna More College, Pune, India
- Department of Chemistry, Haribhai V. Desai College, Pune, India
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31
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Medishetti N, Ittamalla C, Nanubolu JB, Atmakur K. Lewis Acid Zn(OTf)
2
Catalyzed Synthesis ofImidazo[1,2‐
a
]pyridines by [3+2] Annulation of 2‐Amino Pyridines and Propargylic Alcohols. ChemistrySelect 2022. [DOI: 10.1002/slct.202200063] [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)
- Nagaraju Medishetti
- Fluoro & Agrochemicals Department CSIR-Indian Institute of Chemical Technology Tarnaka, Hyderabad 500 007 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad Uttar Pradesh 201002 India
| | - Chaitanya Ittamalla
- Fluoro & Agrochemicals Department CSIR-Indian Institute of Chemical Technology Tarnaka, Hyderabad 500 007 India
| | - Jagadeesh Babu Nanubolu
- Laboratory of X-ray Crystallography CSIR-Indian Institute of Chemical Technology Tarnaka, Hyderabad 500 007 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad Uttar Pradesh 201002 India
| | - Krishnaiah Atmakur
- Fluoro & Agrochemicals Department CSIR-Indian Institute of Chemical Technology Tarnaka, Hyderabad 500 007 India
- Academy of Scientific and Innovative Research (AcSIR) Ghaziabad Uttar Pradesh 201002 India
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32
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Jahan K, Sofi FA, Salim SA, Bharatam PV. NIS mediated dehydrogenative-cyclocondensation in aqueous medium towards the synthesis of 2-arylimidazo[1,2-a]pyridines and their 3-formylated derivatives. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.132715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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33
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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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34
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Das D, Jena AK, Pal CK, Bourda L, Van Hecke K. CuI Nanoparticles‐Catalyzed Regioselective Synthesis of 3‐Nitro‐2‐arylimidazo[1,2‐a]pyridines using Oxygen as Oxidant. ASIAN J ORG CHEM 2022. [DOI: 10.1002/ajoc.202100776] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Dibya Das
- Maharaja Sriram Chandra Bhanja Deo University Chemistry Department of ChemistryMaharaja Sriram Chandra Bhanjadeo University(Erstwhile North Orissa University) Sriram Chandra Vihar, Takatpur, Baripada, Od 757003 Baripada INDIA
| | - Ashis Kumar Jena
- North Orissa University Chemistry Sriram Chandra ViharTakatpur 757003 Baripada INDIA
| | - Chandan Kumar Pal
- Maharaja Sriram Chandra Bhanja Deo University Chemistry Department of ChemistryMaharaja Sriram Chandra Bhanjadeo University(Erstwhile North Orissa University) Sriram Chandra Vihar, Takatpur, Baripada, Od 757003 Baripada INDIA
| | - Laurens Bourda
- Ghent University: Universiteit Gent Chemistry 9000 Ghent BELGIUM
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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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Srivastava V, Singh PK, Tivari S, Singh PP. Visible light photocatalysis in the synthesis of pharmaceutically relevant heterocyclic scaffolds. Org Chem Front 2022. [DOI: 10.1039/d1qo01602d] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Visible light and photoredox catalysis have emerged as a powerful and long-lasting tool for organic synthesis, demonstrating the importance of a variety of chemical bond formation methods.
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Affiliation(s)
- Vishal Srivastava
- Department of Chemistry, CMP Degree College, University of Allahabad, Prayagraj 211002, India
| | - Pravin K. Singh
- Department of Chemistry, CMP Degree College, University of Allahabad, Prayagraj 211002, India
| | - Shraddha Tivari
- Department of Chemistry, CMP Degree College, University of Allahabad, Prayagraj 211002, India
| | - Praveen P. Singh
- Department of Chemistry, United College of Engineering & Research, Naini, Prayagraj 211010, India
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37
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A novel manganese/iodine-catalyzed Ortoleva-King type protocol for the synthesis of imidazo[1,2-a]pyridines and Zolimidine. RESULTS IN CHEMISTRY 2022. [DOI: 10.1016/j.rechem.2022.100474] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022] Open
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38
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Abstract
2-Aminopyridine is a simple, low molecular weight and perfectly functionalised moiety known for the synthesis of diverse biological molecules. Many pharmaceutical companies across the globe aim to synthesise low-molecular weight molecules for use as pharmacophores against various biological targets. 2-Aminopyridine can serve as a perfect locomotive in the synthesis and pulling of such molecules towards respective pharmacological goals. The major advantage of this moiety is its simple design, which can be used to produce single products with minimum side reactions. Moreover, the exact weight of synthesised compounds is low, which enables facile identification of toxicity-causing metabolites in drug discovery programmes. This manuscript is a quick review of such pharmacophores derived from 2-aminopyridine.
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Affiliation(s)
- Ramdas Nishanth Rao
- Department of Chemistry, School of Advanced Science, Vellore Institute of Technology, Vellore 632014, India.
| | - Kaushik Chanda
- Department of Chemistry, School of Advanced Science, Vellore Institute of Technology, Vellore 632014, India.
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39
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Grabarz AM, Ośmiałowski B. Benchmarking Density Functional Approximations for Excited-State Properties of Fluorescent Dyes. Molecules 2021; 26:7434. [PMID: 34946515 PMCID: PMC8703901 DOI: 10.3390/molecules26247434] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2021] [Revised: 11/28/2021] [Accepted: 12/04/2021] [Indexed: 12/05/2022] Open
Abstract
This study presents an extensive analysis of the predictive power of time-dependent density functional theory in determining the excited-state properties of two groups of important fluorescent dyes, difluoroboranes and hydroxyphenylimidazo[1,2-a]pyridine derivatives. To ensure statistically meaningful results, the data set is comprised of 85 molecules manifesting diverse photophysical properties. The vertical excitation energies and dipole moments (in the electronic ground and excited states) of the aforementioned dyes were determined using the RI-CC2 method (reference) and with 18 density functional approximations (DFA). The set encompasses DFAs with varying amounts of exact exchange energy (EEX): from 0% (e.g., SVWN, BLYP), through a medium (e.g., TPSSh, B3LYP), up to a major contribution of EEX (e.g., BMK, MN15). It also includes range-separated hybrids (CAM-B3LYP, LC-BLYP). Similar error profiles of vertical energy were obtained for both dye groups, although the errors related to hydroxyphenylimidazopiridines are significantly larger. Overall, functionals including 40-55% of EEX (SOGGA11-X, BMK, M06-2X) ensure satisfactory agreement with the reference vertical excitation energies obtained using the RI-CC2 method; however, MN15 significantly outperforms them, providing a mean absolute error of merely 0.04 eV together with a very high correlation coefficient (R2 = 0.98). Within the investigated set of functionals, there is no single functional that would equally accurately determine ground- and excited-state dipole moments of difluoroboranes and hydroxyphenylimidazopiridine derivatives. Depending on the chosen set of dyes, the most accurate μGS predictions were delivered by MN15 incorporating a major EEX contribution (difluoroboranes) and by PBE0 containing a minor EEX fraction (hydroxyphenylimidazopiridines). Reverse trends are observed for μES, i.e., for difluoroboranes the best results were obtained with functionals including a minor fraction of EEX, specifically PBE0, while in the case of hydroxyphenylimidazopiridines, much more accurate predictions were provided by functionals incorporating a major EEX contribution (BMK, MN15).
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Affiliation(s)
- Anna M. Grabarz
- Faculty of Chemistry, Wrocław University of Science and Technology, Wyb. Wyspiańskiego 27, PL-50370 Wrocław, Poland
| | - Borys Ośmiałowski
- Faculty of Chemistry, Nicolaus Copernicus University, Gagarina 7, PL-87100 Toruń, Poland;
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Li M, Li G, Dai C, Zhou W, Zhan W, Gao M, Rong Y, Tan Z, Deng W. Visible-light-promoted direct C3-trifluoromethylation and perfluoroalkylation of imidazopyridines. Org Biomol Chem 2021; 19:8301-8306. [PMID: 34545902 DOI: 10.1039/d1ob01417j] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
An efficient method for direct trifluoromethylation and perfluoroalkylation at C3 of imidazopyridines through visible light-promoted C-H bond functionalization was developed. Under the irradiation of a blue LED, a series of C3-perfluoroalkyl-substituted imidazopyridines were synthesized from the corresponding imidazopyridines and perfluoroalkyl iodides in moderate to good yields at room temperature. It should be mentioned that this reaction proceeded in the absence of any transition-metal catalyst, oxidant and photocatalyst.
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Affiliation(s)
- Meichen Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
| | - Gaolin Li
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
| | - Chenxun Dai
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
| | - Wenjun Zhou
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
| | - Wenqiang Zhan
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
| | - Muyang Gao
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
| | - Yuan Rong
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
| | - Ze Tan
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
| | - Wei Deng
- State Key Laboratory of Chemo/Biosensing and Chemometrics, College of Chemistry and Chemical Engineering, Hunan University, Changsha 410082, P. R. China.
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Shukla P, Deswal D, Pandit M, Latha N, Mahajan D, Srivastava T, Narula AK. Exploration of novel TOSMIC tethered imidazo[1,2-a]pyridine compounds for the development of potential antifungal drug candidate. Drug Dev Res 2021; 83:525-543. [PMID: 34569640 DOI: 10.1002/ddr.21883] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2021] [Revised: 08/25/2021] [Accepted: 09/12/2021] [Indexed: 11/10/2022]
Abstract
New candidates of imidazo[1,2-a]pyridine were designed by combining 2-amino pyridine, TOSMIC and various assorted aldehydes to explore their antioxidant and antifungal potential. The design of these derivatives was based on utilizing the antifungal potential of azoles and TOSMIC moiety. These derivatives were synthesized by adopting multi-component reaction methodology, as it serves as a rapid and efficient tool to target structurally diverse heterocyclic compounds in quantitative yield. The resulting imidazo[1,2-a]pyridine derivatives were structurally verified by 1 HNMR, 13 CNMR, HRMS, and HPLC. The compounds were analyzed for their antioxidant and fluorescent properties and it was observed that compound 15 depicted highest potential. The compounds were evaluated for their antifungal potential to highlight their medical application in the area of Invasive Fungal Infections (IFI). Compound 12 gave the highest antifungal inhibition against Aspergillus fumigatus 3007 and Candida albicans 3018. To elucidate the antifungal mechanism, confocal images of treated fungi were analyzed, which depicted porous nature of fungal membrane. Estimation of fungal membrane sterols by UPLC indicated decrease in ergosterol component of fungal membrane. In silico studies further corroborated with the in vitro results as docking studies depicted interaction of synthesized heterocyclic compounds with amino acids present in the active site of target enzyme (lanosterol 14 alpha demethylase). Absorption, distribution, metabolism, and excretion (ADME) analysis was indicative of drug-likeliness of the synthesized compounds.
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Affiliation(s)
- Pratibha Shukla
- University School of Basic and Applied Sciences, Guru Gobind Singh Indraprastha University, New Delhi, India.,Centre of Excellence in Pharmaceutical Sciences (CEPS), Guru Gobind Singh Indraprastha University, Delhi, India
| | - Deepa Deswal
- Centre of Excellence in Pharmaceutical Sciences (CEPS), Guru Gobind Singh Indraprastha University, Delhi, India
| | - Mansi Pandit
- Bioinformatics Infrastructure Facility, Sri Venkateswara College, University of Delhi, New Delhi, India
| | - Narayanan Latha
- Bioinformatics Infrastructure Facility, Sri Venkateswara College, University of Delhi, New Delhi, India
| | - Divyank Mahajan
- Department of Genetics, University of Delhi South Campus, New Delhi, India
| | - Tapasya Srivastava
- Department of Genetics, University of Delhi South Campus, New Delhi, India
| | - Anudeep Kumar Narula
- University School of Basic and Applied Sciences, Guru Gobind Singh Indraprastha University, New Delhi, India.,Centre of Excellence in Pharmaceutical Sciences (CEPS), Guru Gobind Singh Indraprastha University, Delhi, India
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Wu Y, Li L, Wen K, Deng J, Chen J, Shi J, Wu T, Pang J, Tang X. Copper-Catalyzed C-3 Functionalization of Imidazo[1,2- a]pyridines with 3-Indoleacetic Acids. J Org Chem 2021; 86:12394-12402. [PMID: 34387491 DOI: 10.1021/acs.joc.1c01371] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
A copper-catalyzed C-3 functionalization of imidazo[1,2-a]pyridines with 3-indoleacetic acids through an aerobic oxidative decarboxylative process has been developed. The protocol provided a series of 3-(1H-indol-3-ylmethyl)-imidazo[1,2-a]pyridines in moderate to good yields under simple reaction conditions. Importantly, some products exhibited potent antiproliferative activity in cancer cell lines.
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Affiliation(s)
- Yinrong Wu
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, 1023 South Shatai Road, Baiyun District, Guangzhou 510515, People's Republic of China
| | - Lu Li
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, 1023 South Shatai Road, Baiyun District, Guangzhou 510515, People's Republic of China
| | - Kangmei Wen
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, 1023 South Shatai Road, Baiyun District, Guangzhou 510515, People's Republic of China
| | - Jie Deng
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, 1023 South Shatai Road, Baiyun District, Guangzhou 510515, People's Republic of China
| | - Jiewen Chen
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, 1023 South Shatai Road, Baiyun District, Guangzhou 510515, People's Republic of China
| | - Jie Shi
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, 1023 South Shatai Road, Baiyun District, Guangzhou 510515, People's Republic of China
| | - Ting Wu
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, 1023 South Shatai Road, Baiyun District, Guangzhou 510515, People's Republic of China
| | - Jianxin Pang
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, 1023 South Shatai Road, Baiyun District, Guangzhou 510515, People's Republic of China
| | - Xiaodong Tang
- Guangdong Provincial Key Laboratory of New Drug Screening, School of Pharmaceutical Sciences, Southern Medical University, 1023 South Shatai Road, Baiyun District, Guangzhou 510515, People's Republic of China
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Neogi S, Kumar Ghosh A, Mandal S, Ghosh D, Ghosh S, Hajra A. Three-Component Carbosilylation of Alkenes by Merging Iron and Visible-Light Photocatalysis. Org Lett 2021; 23:6510-6514. [PMID: 34379426 DOI: 10.1021/acs.orglett.1c02322] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A mild, efficient, and one-pot protocol for three-component carbosilylation of alkenes with imidazoheterocycle and silanes has been developed by merging iron(II) and visible-light photocatalysis. This C-C and C-Si bond-forming method provides functionalized organosilicon derivatives having imidazoheterocycles moieties in good yields. The reaction possibly proceeds through a radical pathway.
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Affiliation(s)
- Sukanya Neogi
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Asim Kumar Ghosh
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Saurodeep Mandal
- Department of Chemistry, Visva-Bharati (A Central University), Santiniketan 731235, India
| | - Debashis Ghosh
- Department of Chemistry, St. Joseph's College (Autonomous), Bangalore 560027, 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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Chitrakar R, Rawat D, Sistla R, Vadithe LN, Subbarayappa A. Design, synthesis and anticancer activity of sulfenylated imidazo-fused heterocycles. Bioorg Med Chem Lett 2021; 49:128307. [PMID: 34363936 DOI: 10.1016/j.bmcl.2021.128307] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 07/29/2021] [Accepted: 07/31/2021] [Indexed: 01/06/2023]
Abstract
We report herein, the design, synthesis and study of anticancer properties of sulfenylated 2-phenylimidazo[1,2-a]pyridines and their analogues. A set of twenty sulfenylated imidazo[1, 2-a]pyridine derivatives were synthesized. Whereby elusive amendments to the imidazo[1,2-a]pyridine motif confer dramatic changes in functional affinity of a novel action to modulate anticancer activity in seven different human cancer cell lines i.e.: MDA MB 231 (breast), HepG2 (liver), Hela (cervical), A549 (lung), U87MG (glioblastoma), SKMEL-28 (skin melanoma) and DU-145 (prostate) by employing MTT assay. Among the series, compounds 4e (naphthalene), 4f (styrene) and 4h (thiomethyl) showed potent activity towards human liver cancer cells HepG2. Cell cycle analysis results revealed that these compounds arrested the cell cycle at G2/M phase and induced apoptosis in human liver cancer cells HepG2. It was further confirmed by Hoechst staining, Measurement of mitochondrial membrane potential (ΔΨm) and Annexin V-FITC assay.
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Affiliation(s)
- Ravi Chitrakar
- Academy of Scientific & Innovative Research, Natural Products and Green Chemistry Division, CSIR-Central Salt & Marine Chemicals Research Institute, G.B. Marg, Bhavnagar 364002, Gujarat, India
| | - Deepa Rawat
- Academy of Scientific & Innovative Research, Natural Products and Green Chemistry Division, CSIR-Central Salt & Marine Chemicals Research Institute, G.B. Marg, Bhavnagar 364002, Gujarat, India
| | - Ramakrishna Sistla
- Department of Applied Biology, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India.
| | - Lakshma Nayak Vadithe
- Department of Applied Biology, CSIR-Indian Institute of Chemical Technology, Hyderabad 500 007, India
| | - Adimurthy Subbarayappa
- Academy of Scientific & Innovative Research, Natural Products and Green Chemistry Division, CSIR-Central Salt & Marine Chemicals Research Institute, G.B. Marg, Bhavnagar 364002, Gujarat, India.
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Gong F, Zeng D, Zhu H, Qian Y, He L, Xia J, Cao Z. A solvent-assisted ESIPT fluorescent dye for F -/Ag + sensing and high-resolution imaging of the cilia in live cells. Anal Bioanal Chem 2021; 413:6343-6353. [PMID: 34378069 DOI: 10.1007/s00216-021-03590-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2021] [Revised: 07/22/2021] [Accepted: 07/28/2021] [Indexed: 10/20/2022]
Abstract
A solvent-assisted ESIPT fluorescent dye was synthesized and used as a probe (2-PPN) for the detection of F-/Ag+ and high-resolution imaging of the cilia in live cells. The developed ESIPT fluorophore exhibited strong tautomeric fluorescence in protic solvents and normal emission in aprotic solvents, which is a significant departure from that of conventional intramolecular ESIPT compounds. The H-binding interaction of F- and the chelation of Ag+ with the ESIPT module of 2-PPN resulted in significant tautomeric emission quenching. From this basis, the 2-PPN-based assays for the detection of F- and Ag+ were established. The detection limit for F- and Ag+ sensing is 2.4 nM and 1.5 nM, respectively. The selective experimental results showed that no tautomeric fluorescence change of 2-PPN could be observed in the presence of the other inorganic ions in the same medium, revealing high selectivity of 2-PPN to F- and Ag+. Furthermore, MTT assay experiments proved that the probe 2-PPN exhibited low cytotoxicity and good cell membrane permeability. The probe was also further successfully utilized to image the cilia in vitro MCF7 cells, displaying its high-resolution imaging performance.Graphical abstract.
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Affiliation(s)
- Fuchun Gong
- College of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, 410114, Hunan, People's Republic of China.
| | - Dan Zeng
- College of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, 410114, Hunan, People's Republic of China
| | - Hanming Zhu
- College of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, 410114, Hunan, People's Republic of China
| | - You Qian
- College of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, 410114, Hunan, People's Republic of China
| | - Lingzhi He
- College of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, 410114, Hunan, People's Republic of China
| | - Jiaoyun Xia
- College of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, 410114, Hunan, People's Republic of China
| | - Zhong Cao
- College of Chemistry and Food Engineering, Changsha University of Science and Technology, Changsha, 410114, Hunan, People's Republic of China
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Singh D, Chowdhury SR, Pramanik S, Maity S. Molecular iodine enabled generation of iminyl radicals from oximes: A facile route to imidazo[1,2-a]pyridines and its regioselective C-3 sulfenylated products from simple pyridines. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132125] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Gan Z, Zhu X, Yan Q, Song X, Yang D. Oxidative dual C–H sulfenylation: A strategy for the synthesis of bis(imidazo[1,2-a]pyridin-3-yl)sulfanes under metal-free conditions using sulfur powder. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2020.12.046] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
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49
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Chaubey NR, Kapdi AR, Maity B. Organophotoredox-Catalyzed C–H Alkylation of Imidazoheterocycles with Malonates: Total Synthesis of Zolpidem. SYNTHESIS-STUTTGART 2021. [DOI: 10.1055/s-0040-1706103] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Abstract
AbstractOrganophotocatalytic C–H bond functionalization has attracted a lot of attention in the past several years due to the possibility of catalyzing reactions in a metal- and peroxide-free environment. Continuing on these lines, an organophotoredox-catalyzed C–H functionalization of imidazo[1,2-a]pyridines and related heterocycles with bromomalonates under mild conditions is reported, providing excellent yields of the products at room temperature. This is the first report involving malonates as coupling partners leading to the synthesis of a range of functionalized products including total synthesis of zolpidem, a sedative-hypnotic drug molecule.
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Affiliation(s)
| | - Anant R. Kapdi
- Institute of Chemical Technology, Department of Chemistry
| | - Biswanath Maity
- Translational Cell Biology Unit, Centre of Biomedical Research
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Keshri SK, Mandal K, Kumar Y, Yadav D, Mukhopadhyay P. Naphthalenediimides with High Fluorescence Quantum Yield: Bright-Red, Stable, and Responsive Fluorescent Dyes. Chemistry 2021; 27:6954-6962. [PMID: 33539577 DOI: 10.1002/chem.202100020] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2021] [Revised: 01/28/2021] [Indexed: 12/22/2022]
Abstract
The naphthalenediimide (NDI) scaffold in contrast to its higher congeners possess low-fluorescence. In spite of elegant synthetic developments, a highly emissive NDI is quite rare to find, as well as, a green-light-emitting NDI is yet to be explored. Herein, we report a novel class of symmetric and asymmetric NH2 -substituted core-NDIs (1-5) with tunable fluorescence in the visible region and extending to the NIR frontier. Importantly, the bis-NH2 -substituted NDI 2 revealed quantum yield, Φ f of ≈81 and ≈68 % in toluene and DMSO, respectively, suggesting versatility of the fluorophore in a wide range of solvent polarity. The dye 1 is shown to be the first NDI-based green-light emitter. The donor piperidine group in 5 diminish the Φ f by 40-fold providing a lever to modulate the excited-state intramolecular proton transfer (ESIPT) process. Our synthetic protocol applies a Pd catalyst and a benign hydride source simplifying the non-trivial -NH2 group integration at the NDI-core. TD-DFT calculations predicted strong intramolecular hydrogen bonds in the excited state in the bulk nonpolar medium and responsiveness to solvent polarity. The maximization of the NDI emission outlined here would further boost the burgeoning repertoire of applications of the NDI scaffold.
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Affiliation(s)
- Sudhir Kumar Keshri
- Supramolecular and Material Chemistry Lab, School of Physical Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Kalyanashis Mandal
- Supramolecular and Material Chemistry Lab, School of Physical Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Yogendra Kumar
- Supramolecular and Material Chemistry Lab, School of Physical Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Devendra Yadav
- Supramolecular and Material Chemistry Lab, School of Physical Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
| | - Pritam Mukhopadhyay
- Supramolecular and Material Chemistry Lab, School of Physical Sciences, Jawaharlal Nehru University, New Delhi, 110067, India
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