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Venugopal G, Kumar V, Badrinarayan Jadhav A, Dongre SD, Khan A, Gonnade R, Kumar J, Santhosh Babu S. Boron- and Oxygen-Doped π-Extended Helical Nanographene with Circularly Polarised Thermally Activated Delayed Fluorescence. Chemistry 2024; 30:e202304169. [PMID: 38270385 DOI: 10.1002/chem.202304169] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 01/24/2024] [Accepted: 01/25/2024] [Indexed: 01/26/2024]
Abstract
Helical nanographenes have garnered substantial attention owing to their finely adjustable optical and semiconducting properties. The strategic integration of both helicity and heteroatoms into the nanographene structure, facilitated by a boron-oxygen-based multiple resonance (MR) thermally activated delayed fluorescence (TADF), elevates its photophysical and chiroptical features. This signifies the introduction of an elegant category of helical nanographene that combines optical (TADF) and chiroptical (CPL) features. In this direction, we report the synthesis, optical, and chiroptical properties of boron, oxygen-doped Π-extended helical nanographene. The π-extension induces distortion in the DOBNA-incorporated nanographene, endowing a pair of helicenes, (P)-B2NG, and (M)-B2NG exhibiting circularly polarized luminescence with glum of -2.3×10-3 and +2.5×10-3, respectively. B2NG exhibited MR-TADF with a lifetime below 5 μs, and a reasonably high fluorescence quantum yield (50 %). Our molecular design enriches the optical and chiroptical properties of nanographenes and opens up new opportunities in multidisciplinary fields.
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Affiliation(s)
- Geethu Venugopal
- CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411 008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India
| | - Viksit Kumar
- CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411 008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India
| | - Ashok Badrinarayan Jadhav
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Tirupati, 517507, India
| | - Sangram D Dongre
- CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411 008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India
| | - Abujunaid Khan
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India
- NCIM-Resource Center, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411 008, India
| | - Rajesh Gonnade
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India
- Physical and Materials Chemistry Division, CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411 008, India
| | - Jatish Kumar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER), Tirupati, 517507, India
| | - Sukumaran Santhosh Babu
- CSIR-National Chemical Laboratory (CSIR-NCL), Dr. Homi Bhabha Road, Pune, 411 008, India
- Academy of Scientific and Innovative Research (AcSIR), Ghaziabad, 201 002, India
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2
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Mhaske K, Gangai S, Fernandes R, Kamble A, Chowdhury A, Narayan R. Aerobic Catalytic Cross-Dehydrogenative Coupling of Furans with Indoles Provides Access to Fluorophores with Large Stokes Shift. Chemistry 2024; 30:e202302929. [PMID: 38175849 DOI: 10.1002/chem.202302929] [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: 09/08/2023] [Indexed: 01/06/2024]
Abstract
Sustainability in chemical processes is a crucial aspect in contemporary chemistry with sustainable catalysis as a vital parameter of the same. There has been a renewed focus on utilizing earth-abundant metal catalysts to expand the repertoire of organic reactions. Furan is a versatile heterocycle of natural origin used for multiple applications. However, it has scarcely been used in cross-dehydrogenative coupling. In this work, we have explored the cross-dehydrogentive coupling of furans with indoles using commonly available, inexpensive FeCl3 ⋅ 6H2 O (<0.25 $/g) as catalyst in the presence of so called 'ultimate oxidant' - oxygen, without the need for any external ligand or additive. The reactions were found to be scalable and to work even under partially aqueous conditions. This makes the reaction highly economical, practical, operationally simple and sustainable. The methodology provides direct access to π-conjugated short oligomers consisting of furan, thiophene and indole. These compounds were found to show interesting fluorescence properties with remarkably large Stokes shift (up to 205 nm). Mechanistic investigations reveal that the reaction proceeds through chemoselective oxidation of indole by the metal catalyst followed by nucleophilic trapping by furan.
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Affiliation(s)
- Krishna Mhaske
- School of Chemical and Materials Sciences, Indian Institute of Technology Goa, Farmagudi, Goa, 403401, India
| | - Shon Gangai
- School of Chemical and Materials Sciences, Indian Institute of Technology Goa, Farmagudi, Goa, 403401, India
| | - Rushil Fernandes
- School of Chemical and Materials Sciences, Indian Institute of Technology Goa, Farmagudi, Goa, 403401, India
| | - Angulimal Kamble
- School of Chemical and Materials Sciences, Indian Institute of Technology Goa, Farmagudi, Goa, 403401, India
| | - Arkaprava Chowdhury
- Department of Chemistry, Indian Institute of Technology Bombay, Mumbai, 400076, Maharashtra, India
| | - Rishikesh Narayan
- School of Chemical and Materials Sciences, Indian Institute of Technology Goa, Farmagudi, Goa, 403401, India
- School of Interdisciplinary Life Sciences, Indian Institute of Technology Goa, Farmagudi, Goa, 403401, India
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3
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Gangai S, Fernandes R, Mhaske K, Narayan R. Cu(ii)-catalyzed aerobic oxidative coupling of furans with indoles enables expeditious synthesis of indolyl-furans with blue fluorescence. RSC Adv 2024; 14:1239-1249. [PMID: 38174245 PMCID: PMC10762296 DOI: 10.1039/d3ra08226a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2023] [Accepted: 12/15/2023] [Indexed: 01/05/2024] Open
Abstract
With the purpose of incorporating sustainability in chemical processes, there has been a renewed focus on utilizing earth-abundant metal catalysts to expand the repertoire of organic reactions and processes. In this work, we have explored the atom-economic oxidative coupling between two important electron-rich heterocycles - indoles and furans - using commonly available, inexpensive metal catalyst CuCl2·2H2O (<0.25$ per g) to develop an expeditious synthesis of indolyl-furans. Moreover, the reaction proceeded well in the presence of the so-called 'ultimate oxidant' - air, without the need for any external ligand or additive. The reaction was found to be scalable and to work even under partially aqueous conditions. This makes the methodology highly economical, practical, operationally simple and sustainable. In addition, the methodology provides direct access to novel indole-furan-thiophene (IFT)-based electron-rich π-conjugated systems, which show green-yellow fluorescence with large Stokes shift and high quantum yields. Mechanistic investigations reveal that the reaction proceeds through chemoselective oxidation of indole by the metal catalyst followed by the nucleophilic attack by furan.
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Affiliation(s)
- Shon Gangai
- School of Chemical and Materials Sciences, Indian Institute of Technology Goa, GEC Campus Farmagudi Goa-403401 India
| | - Rushil Fernandes
- School of Chemical and Materials Sciences, Indian Institute of Technology Goa, GEC Campus Farmagudi Goa-403401 India
| | - Krishna Mhaske
- School of Chemical and Materials Sciences, Indian Institute of Technology Goa, GEC Campus Farmagudi Goa-403401 India
| | - Rishikesh Narayan
- School of Chemical and Materials Sciences, Indian Institute of Technology Goa, GEC Campus Farmagudi Goa-403401 India
- School of Interdisciplinary Life Sciences, Indian Institute of Technology Goa GEC Campus, Farmagudi Goa-403401 India
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4
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Garg A, Goel N, Abhinav N, Varma T, Achari A, Bhattacharjee P, Kamal IM, Chakrabarti S, Ravichandiran V, Reddy AM, Gupta S, Jaisankar P. Virtual screening of natural products inspired in-house library to discover potential lead molecules against the SARS-CoV-2 main protease. J Biomol Struct Dyn 2023; 41:2033-2045. [PMID: 35043750 DOI: 10.1080/07391102.2022.2027271] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Abstract
SARS-CoV-2, a new coronavirus emerged in 2019, causing a global healthcare epidemic. Although a variety of drug targets have been identified as potential antiviral therapies, and effective candidate against SARS-CoV-2 remains elusive. One of the most promising targets for combating COVID-19 is SARS-CoV-2 Main protease (Mpro, a protein responsible for viral replication. In this work, an in-house curated library was thoroughly evaluated for druggability against Mpro. We identified four ligands (FG, Q5, P5, and PJ4) as potential inhibitors based on docking scores, predicted binding energies (MMGBSA), in silico ADME, and RMSD trajectory analysis. Among the selected ligands, FG, a natural product from Andrographis nallamalayana, exhibited the highest binding energy of -10.31 kcal/mol close to the docking score of clinical candidates Boceprevir and GC376. Other ligands (P5, natural product from cardiospermum halicacabum and two synthetic molecules Q5 and PJ4) have shown comparable docking scores ranging -7.65 kcal/mol to -7.18 kcal/mol. Interestingly, we found all four top ligands had Pi bond interaction with the main amino acid residues HIS41 and CYS145 (catalytic dyad), H-bonding interactions with GLU166, ARG188, and GLN189, and hydrophobic interactions with MET49 and MET165 in the binding site of Mpro. According to the ADME analysis, Q5 and P5 are within the acceptable range of drug likeliness, compared to FG and PJ4. The interaction stability of the lead molecules with viral protease was verified using replicated MD simulations. Thus, the present study opens up the opportunity of developing drug candidates targeting SARS-CoV-2 main protease (Mpro) to mitigate the disease.Communicated by Ramaswamy H. Sarma.
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Affiliation(s)
- Aakriti Garg
- National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, Kolkata, India.,Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Narender Goel
- National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, Kolkata, India.,Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Nipun Abhinav
- National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, Kolkata, India.,Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Tanmay Varma
- National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, Kolkata, India
| | - Anushree Achari
- Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Pinaki Bhattacharjee
- Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Izaz Monir Kamal
- Department of Structural Biology and Bioinformatics, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Saikat Chakrabarti
- Department of Structural Biology and Bioinformatics, CSIR-Indian Institute of Chemical Biology, Kolkata, India
| | - Velayutham Ravichandiran
- National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, Kolkata, India
| | | | - Sreya Gupta
- National Institute of Pharmaceutical Education and Research (NIPER), Kolkata, Chunilal Bhawan, Kolkata, India
| | - Parasuraman Jaisankar
- Department of Organic and Medicinal Chemistry, CSIR-Indian Institute of Chemical Biology, Kolkata, India
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5
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Shaaban S, Li H, Otte F, Strohmann C, Antonchick AP, Waldmann H. Enantioselective Synthesis of Five-Membered-Ring Atropisomers with a Chiral Rh(III) Complex. Org Lett 2020; 22:9199-9202. [PMID: 33186042 PMCID: PMC7735750 DOI: 10.1021/acs.orglett.0c03355] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2020] [Indexed: 11/28/2022]
Abstract
Axially chiral atropisomeric compounds are widely applied in asymmetric catalysis and medicinal chemistry, and efficient methods for their synthesis are in high demand. This applies in particular to atropisomers derived from five-membered aromatic rings because their lower barrier for rotation among the biaryl axis limits their asymmetric synthesis. We report here an enantioselective C-H functionalization method using our chiral RhJasCp complex for the synthesis of the biaryl atropisomer types that can be accessed from three different five-membered-ring heterocycles.
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Affiliation(s)
- Saad Shaaban
- Max-Planck-Institute
of Molecular Physiology, Department of Chemical
Biology, Otto-Hahn-Straße
11, 44227 Dortmund, Germany
| | - Houhua Li
- Max-Planck-Institute
of Molecular Physiology, Department of Chemical
Biology, Otto-Hahn-Straße
11, 44227 Dortmund, Germany
| | - Felix Otte
- Technical
University Dortmund, Department of Inorganic
Chemistry, Otto-Hahn-Straße
6, 44227 Dortmund, Germany
| | - Carsten Strohmann
- Technical
University Dortmund, Department of Inorganic
Chemistry, Otto-Hahn-Straße
6, 44227 Dortmund, Germany
| | - Andrey P. Antonchick
- Max-Planck-Institute
of Molecular Physiology, Department of Chemical
Biology, Otto-Hahn-Straße
11, 44227 Dortmund, Germany
- Technical
University Dortmund, Faculty of Chemical
Biology, Otto-Hahn-Straße
4a, 44227 Dortmund, Germany
| | - Herbert Waldmann
- Max-Planck-Institute
of Molecular Physiology, Department of Chemical
Biology, Otto-Hahn-Straße
11, 44227 Dortmund, Germany
- Technical
University Dortmund, Faculty of Chemical
Biology, Otto-Hahn-Straße
4a, 44227 Dortmund, Germany
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6
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Mancinelli M, Bencivenni G, Pecorari D, Mazzanti A. Stereochemistry and Recent Applications of Axially Chiral Organic Molecules. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901918] [Citation(s) in RCA: 24] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Michele Mancinelli
- Department of Industrial Chemistry “Toso Montanari” University of Bologna Viale Risorgimento 4 40136 Bologna Italy
| | - Giorgio Bencivenni
- Department of Industrial Chemistry “Toso Montanari” University of Bologna Viale Risorgimento 4 40136 Bologna Italy
| | - Daniel Pecorari
- Department of Industrial Chemistry “Toso Montanari” University of Bologna Viale Risorgimento 4 40136 Bologna Italy
| | - Andrea Mazzanti
- Department of Industrial Chemistry “Toso Montanari” University of Bologna Viale Risorgimento 4 40136 Bologna Italy
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