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D'Amico F, Papucci C, Franchi D, Reginato G, Taddei M, Mordini A, Zani L, Dessì A, Calamante M. Pd-Catalyzed Miyaura Borylation and Telescopic Borylation/Suzuki-Miyaura Cross-Coupling Processes in Deep-Eutectic Solvents. J Org Chem 2024; 89:6991-7003. [PMID: 38716702 DOI: 10.1021/acs.joc.4c00357] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
We report an efficient procedure to carry out palladium-catalyzed Miyaura borylation reactions of (hetero)aromatic halides and triflates in choline chloride (ChCl)-based deep eutectic solvents (DESs). The procedure employs bis(pinacolato)diboron as a boron source and a catalyst prepared in situ from readily available Pd2(dba)3 and the phosphine ligand XPhos. Reactions proceed well in different ChCl-based DESs, among which the best results were provided by environmentally friendly and biodegradable mixtures with glycerol and glucose. The reaction tolerates both EDG and EWG substituents on the substrates and can be run on different halides (chloride, bromide, iodide) and pseudohalides (triflate). Furthermore, for several substrates, the catalyst loading can be reduced to 1 mol % Pd (0.5% mol Pd2(dba)3) without compromising the reaction yield. Moreover, we show that the Miyaura borylation protocol in DES can be combined with a subsequent Suzuki-Miyaura cross-coupling reaction in a one-pot procedure, allowing access to various biaryl products and demonstrating its synthetic utility by preparing the precursors of two compounds with reported applications in the photovoltaics sector. Finally, two green metrics (E-factor and EcoScale) of the new one-pot procedure in DES were calculated and compared with literature values to assess the potential advantages in terms of waste reduction, safety, and energy consumption.
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Affiliation(s)
- Francesco D'Amico
- Institute of Chemistry of Organometallic Compounds (CNR-ICCOM), 50019 Sesto Fiorentino, Italy
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy
| | - Costanza Papucci
- Institute of Chemistry of Organometallic Compounds (CNR-ICCOM), 50019 Sesto Fiorentino, Italy
- Department of Chemistry "U. Schiff", University of Florence, 50019 Sesto Fiorentino, Italy
| | - Daniele Franchi
- Institute of Chemistry of Organometallic Compounds (CNR-ICCOM), 50019 Sesto Fiorentino, Italy
| | - Gianna Reginato
- Institute of Chemistry of Organometallic Compounds (CNR-ICCOM), 50019 Sesto Fiorentino, Italy
| | - Maurizio Taddei
- Department of Biotechnology, Chemistry and Pharmacy, University of Siena, 53100 Siena, Italy
| | - Alessandro Mordini
- Institute of Chemistry of Organometallic Compounds (CNR-ICCOM), 50019 Sesto Fiorentino, Italy
- Department of Chemistry "U. Schiff", University of Florence, 50019 Sesto Fiorentino, Italy
| | - Lorenzo Zani
- Institute of Chemistry of Organometallic Compounds (CNR-ICCOM), 50019 Sesto Fiorentino, Italy
| | - Alessio Dessì
- Institute of Chemistry of Organometallic Compounds (CNR-ICCOM), 50019 Sesto Fiorentino, Italy
| | - Massimo Calamante
- Institute of Chemistry of Organometallic Compounds (CNR-ICCOM), 50019 Sesto Fiorentino, Italy
- Department of Chemistry "U. Schiff", University of Florence, 50019 Sesto Fiorentino, Italy
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Shahzadi H, Fatima S, Akhter N, Alazmi M, Nawaf A, Said KB, AlGhadhban A, Sulieman AME, Saleem RSZ, Chotana GA. Iridium-Catalyzed C-H Borylation of CF 3-Substituted Pyridines. ACS Omega 2022; 7:11460-11472. [PMID: 35415379 PMCID: PMC8992268 DOI: 10.1021/acsomega.2c00773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2022] [Accepted: 03/15/2022] [Indexed: 06/14/2023]
Abstract
Iridium-catalyzed C-H borylation of CF3-substituted pyridines is described in this paper. The boronic ester group can be installed on the α, β, or γ position of pyridine by an appropriate substitution pattern. Sterically governed regioselectivity provides convenient access to a variety of CF3-substituted pyridylboronic esters. These catalytic C-H borylation reactions were carried out neatly without the use of any solvent. Several functional groups, such as halo, ester, alkoxy, amino, etc., are compatible with this methodology. These pyridylboronic esters are amenable to column chromatography and the products were isolated in good to excellent yields. α-Borylated pyridines, although isolated in good yields, do not have a long shelf life. The boronic ester derivatives of these CF3-substituted pyridines can serve as useful precursors in the synthesis regime.
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Affiliation(s)
- Hafiza
Tayyaba Shahzadi
- Department
of Chemistry and Chemical Engineering, Syed Babar Ali School of Science
and Engineering, Lahore University of Management
Sciences, Lahore 54792, Pakistan
| | - Saman Fatima
- Department
of Chemistry and Chemical Engineering, Syed Babar Ali School of Science
and Engineering, Lahore University of Management
Sciences, Lahore 54792, Pakistan
| | - Naseem Akhter
- Department
of Chemistry and Chemical Engineering, Syed Babar Ali School of Science
and Engineering, Lahore University of Management
Sciences, Lahore 54792, Pakistan
- Department
of Chemistry, Government Sadiq College Women
University, Bahawalpur 63100, Pakistan
| | - Meshari Alazmi
- College
of Computer Science and Engineering, University
of Ha’il, P.O. Box 2440, Ha’il 81451, Saudi
Arabia
| | - Alshammari Nawaf
- College
of Science, University of Ha’il, P.O. Box 2440, Ha’il 81451, Saudi Arabia
| | | | - Amer AlGhadhban
- College of
Engineering, University of Ha’il, Ha’il 81451, Saudi Arabia
| | | | - Rahman Shah Zaib Saleem
- Department
of Chemistry and Chemical Engineering, Syed Babar Ali School of Science
and Engineering, Lahore University of Management
Sciences, Lahore 54792, Pakistan
| | - Ghayoor Abbas Chotana
- Department
of Chemistry and Chemical Engineering, Syed Babar Ali School of Science
and Engineering, Lahore University of Management
Sciences, Lahore 54792, Pakistan
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Alsiary RA, Alghrably M, Saoudi A, Al-Ghamdi S, Jaremko L, Jaremko M, Emwas AH. Using NMR spectroscopy to investigate the role played by copper in prion diseases. Neurol Sci 2020; 41:2389-2406. [PMID: 32328835 PMCID: PMC7419355 DOI: 10.1007/s10072-020-04321-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/22/2019] [Accepted: 02/29/2020] [Indexed: 12/31/2022]
Abstract
Prion diseases are a group of rare neurodegenerative disorders that develop as a result of the conformational conversion of normal prion protein (PrPC) to the disease-associated isoform (PrPSc). The mechanism that actually causes disease remains unclear. However, the mechanism underlying the conformational transformation of prion protein is partially understood-in particular, there is strong evidence that copper ions play a significant functional role in prion proteins and in their conformational conversion. Various models of the interaction of copper ions with prion proteins have been proposed for the Cu (II)-binding, cell-surface glycoprotein known as prion protein (PrP). Changes in the concentration of copper ions in the brain have been associated with prion diseases and there is strong evidence that copper plays a significant functional role in the conformational conversion of PrP. Nevertheless, because copper ions have been shown to have both a positive and negative effect on prion disease onset, the role played by Cu (II) ions in these diseases remains a topic of debate. Because of the unique properties of paramagnetic Cu (II) ions in the magnetic field, their interactions with PrP can be tracked even at single atom resolution using nuclear magnetic resonance (NMR) spectroscopy. Various NMR approaches have been utilized to study the kinetic, thermodynamic, and structural properties of Cu (II)-PrP interactions. Here, we highlight the different models of copper interactions with PrP with particular focus on studies that use NMR spectroscopy to investigate the role played by copper ions in prion diseases.
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Affiliation(s)
- Rawiah A. Alsiary
- King Abdullah International Medical Research Center (KAIMRC), Jeddah, Saudi Arabia/King Saud bin Abdulaziz University for Health Sciences (KSAU-HS), Jeddah, Saudi Arabia
| | - Mawadda Alghrably
- Biological and Environmental Science and Engineering (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Abdelhamid Saoudi
- Oncology, Ministry of National Guard Health Affairs, Jeddah, Saudi Arabia. King Abdullah International Medical Research Center (KAIMRC), Jeddah, Saudi Arabia/King Saud bin Abdulaziz University for Health Sciences (KSAU-HS), Jeddah, Saudi Arabia
| | - Suliman Al-Ghamdi
- Oncology, Ministry of National Guard Health Affairs, Jeddah, Saudi Arabia. King Abdullah International Medical Research Center (KAIMRC), Jeddah, Saudi Arabia/King Saud bin Abdulaziz University for Health Sciences (KSAU-HS), Jeddah, Saudi Arabia
| | - Lukasz Jaremko
- Biological and Environmental Science and Engineering (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Mariusz Jaremko
- Biological and Environmental Science and Engineering (BESE), King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
| | - Abdul-Hamid Emwas
- Imaging and Characterization Core Lab, King Abdullah University of Science and Technology (KAUST), Thuwal, Kingdom of Saudi Arabia
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Kanwal S, Ann NU, Fatima S, Emwas AH, Alazmi M, Gao X, Ibrar M, Zaib Saleem RS, Chotana GA. Facile Synthesis of NH-Free 5-(Hetero)Aryl-Pyrrole-2-Carboxylates by Catalytic C-H Borylation and Suzuki Coupling. Molecules 2020; 25:molecules25092106. [PMID: 32365945 PMCID: PMC7248765 DOI: 10.3390/molecules25092106] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2020] [Revised: 04/26/2020] [Accepted: 04/29/2020] [Indexed: 11/25/2022] Open
Abstract
A convenient two-step preparation of NH-free 5-aryl-pyrrole-2-carboxylates is described. The synthetic route consists of catalytic borylation of commercially available pyrrole-2-carboxylate ester followed by Suzuki coupling without going through pyrrole N–H protection and deprotection steps. The resulting 5-aryl substituted pyrrole-2-carboxylates were synthesized in good- to excellent yields. This synthetic route can tolerate a variety of functional groups including those with acidic protons on the aryl bromide coupling partner. This methodology is also applicable for cross-coupling with heteroaryl bromides to yield pyrrole-thiophene, pyrrole-pyridine, and 2,3’-bi-pyrrole based bi-heteroaryls.
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Affiliation(s)
- Saba Kanwal
- Department of Chemistry and Chemical Engineering, Syed Babar Ali School of Science & Engineering (SBASSE), Lahore University of Management Sciences (LUMS), Lahore 54792, Pakistan; (S.K.); (N.-u.-A.); (S.F.); (M.I.); (R.S.Z.S.)
| | - Noor-ul- Ann
- Department of Chemistry and Chemical Engineering, Syed Babar Ali School of Science & Engineering (SBASSE), Lahore University of Management Sciences (LUMS), Lahore 54792, Pakistan; (S.K.); (N.-u.-A.); (S.F.); (M.I.); (R.S.Z.S.)
| | - Saman Fatima
- Department of Chemistry and Chemical Engineering, Syed Babar Ali School of Science & Engineering (SBASSE), Lahore University of Management Sciences (LUMS), Lahore 54792, Pakistan; (S.K.); (N.-u.-A.); (S.F.); (M.I.); (R.S.Z.S.)
| | - Abdul-Hamid Emwas
- Core Labs, King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia;
| | - Meshari Alazmi
- Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia; (M.A.); (X.G.)
- College of Computer Science and Engineering, University of Ha’il, P.O. Box 2440, Ha’il 81481, Saudi Arabia
| | - Xin Gao
- Computer, Electrical and Mathematical Sciences and Engineering (CEMSE) Division, Computational Bioscience Research Center (CBRC), King Abdullah University of Science and Technology (KAUST), Thuwal 23955-6900, Saudi Arabia; (M.A.); (X.G.)
| | - Maha Ibrar
- Department of Chemistry and Chemical Engineering, Syed Babar Ali School of Science & Engineering (SBASSE), Lahore University of Management Sciences (LUMS), Lahore 54792, Pakistan; (S.K.); (N.-u.-A.); (S.F.); (M.I.); (R.S.Z.S.)
| | - Rahman Shah Zaib Saleem
- Department of Chemistry and Chemical Engineering, Syed Babar Ali School of Science & Engineering (SBASSE), Lahore University of Management Sciences (LUMS), Lahore 54792, Pakistan; (S.K.); (N.-u.-A.); (S.F.); (M.I.); (R.S.Z.S.)
| | - Ghayoor Abbas Chotana
- Department of Chemistry and Chemical Engineering, Syed Babar Ali School of Science & Engineering (SBASSE), Lahore University of Management Sciences (LUMS), Lahore 54792, Pakistan; (S.K.); (N.-u.-A.); (S.F.); (M.I.); (R.S.Z.S.)
- Correspondence: ; Tel.: +92-42-3560-8281
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Genov GR, Douthwaite JL, Lahdenperä ASK, Gibson DC, Phipps RJ. Enantioselective remote C-H activation directed by a chiral cation. Science 2020; 367:1246-1251. [PMID: 32165586 DOI: 10.1126/science.aba1120] [Citation(s) in RCA: 145] [Impact Index Per Article: 36.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Accepted: 02/19/2020] [Indexed: 12/24/2022]
Abstract
Chiral cations have been used extensively as organocatalysts, but their application to rendering transition metal-catalyzed processes enantioselective remains rare. This is despite the success of the analogous charge-inverted strategy in which cationic metal complexes are paired with chiral anions. We report here a strategy to render a common bipyridine ligand anionic and pair its iridium complexes with a chiral cation derived from quinine. We have applied these ion-paired complexes to long-range asymmetric induction in the desymmetrization of the geminal diaryl motif, located on a carbon or phosphorus center, by enantioselective C-H borylation. In principle, numerous common classes of ligand could likewise be amenable to this approach.
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Affiliation(s)
- Georgi R Genov
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - James L Douthwaite
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Antti S K Lahdenperä
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - David C Gibson
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK
| | - Robert J Phipps
- Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge, CB2 1EW, UK.
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Shimbayashi T, Fujita K. Iridium-Catalyzed Dehydrogenative Reactions. TOP ORGANOMETAL CHEM 2020. [DOI: 10.1007/3418_2020_56] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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