1
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Kótai B, Laczkó G, Hamza A, Pápai I. Stereocontrol via Propeller Chirality in FLP-Catalyzed Asymmetric Hydrogenation. Chemistry 2024; 30:e202400241. [PMID: 38294415 DOI: 10.1002/chem.202400241] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2024] [Revised: 01/31/2024] [Accepted: 01/31/2024] [Indexed: 02/01/2024]
Abstract
Utilization of chiral frustrated Lewis pairs as catalysts in enantioselective hydrogenation of unsaturated molecules represents a promising approach in asymmetric synthesis. In our effort to improve our current understanding of the factors governing the stereoselectivity in these catalytic processes, herein we examined the mechanism of direct hydrogenation of aromatic enamines catalyzed by a binaphthyl-based chiral amino-borane. Our computational analysis reveals that only one particular conformer of the key borohydride reaction intermediate can be regarded as a reactive form of this species. This borohydride conformer has a well-defined chiral propeller shape, which induces facial selectivity in the hydride transfer to pro-chiral iminium intermediates. The propeller chirality of the reactive borohydride conformer is generated by the axially chiral binaphthyl scaffold of the amino-borane catalyst through stabilizing π-π stacking interactions. This new computational insight can be readily used to interpret the high degree of stereoinduction observed for these reactions. We expect that the concept of chirality relay could be further exploited in catalyst design endeavors.
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Affiliation(s)
- B Kótai
- Institute of Organic Chemistry, Research Centre for Natural Sciences, H-1117, Budapest, Magyar tudósok körútja 2
- Hevesy György Ph.D. School of Chemistry, Eötvös Loránd University, P.O. Box 32, H-1518, Budapest, Hungary
| | - G Laczkó
- Institute of Organic Chemistry, Research Centre for Natural Sciences, H-1117, Budapest, Magyar tudósok körútja 2
- Hevesy György Ph.D. School of Chemistry, Eötvös Loránd University, P.O. Box 32, H-1518, Budapest, Hungary
| | - A Hamza
- Institute of Organic Chemistry, Research Centre for Natural Sciences, H-1117, Budapest, Magyar tudósok körútja 2
| | - I Pápai
- Institute of Organic Chemistry, Research Centre for Natural Sciences, H-1117, Budapest, Magyar tudósok körútja 2
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2
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Konsewicz K, Laczkó G, Pápai I, Zhivonitko VV. Activation of H 2 using ansa-aminoboranes: solvent effects, dynamics, and spin hyperpolarization. Phys Chem Chem Phys 2024; 26:3197-3207. [PMID: 38193236 DOI: 10.1039/d3cp05816f] [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: 01/10/2024]
Abstract
Spin hyperpolarization generated upon activation of parahydrogen, the spin-0 isomer of H2, by ansa-aminoboranes (AABs) constitutes a rare but interesting example of applied metal-free catalysis in parahydrogen-induced polarization (PHIP). AAB molecular moieties made of light elements would be useful in important areas of NMR, such as chemosensing and the production of hyperpolarized substances, or generally in NMR sensitivity enhancement. At the same time, little is known about the detailed mechanistic aspects of underlying chemical processes. Herein, we present a joint experimental-computational study of the kinetic and thermodynamic aspects of H2 activation by AABs, for the first time providing molecular-level details and results of PHIP experiments with AABs in various solvents. Specifically, a large number of kinetic and thermodynamic parameters are measured experimentally for H2 activation by 2-aminophenylboranes of variable steric bulkiness of the boryl site. A clear correlation between the experimental and DFT-predicted thermochemical parameters is observed. PHIP effects in toluene, dichloromethane, and acetonitrile are characterized and rationalized based on the use of the kinetic and nuclear spin relaxation parameters. Altogether, the obtained results provide valuable information for the further rational design of efficient AAB catalysts for metal-free PHIP based on frustrated Lewis pair (FLP) chemistry.
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Affiliation(s)
- Karolina Konsewicz
- NMR Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, Oulu, 90014, Finland.
| | - Gergely Laczkó
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117 Budapest, Hungary
- Hevesy György PhD School of Chemistry, Eötvös Loránd University, P.O. Box 32, H-1518 Budapest, Hungary
| | - Imre Pápai
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Magyar Tudósok Körútja 2, H-1117 Budapest, Hungary
| | - Vladimir V Zhivonitko
- NMR Research Unit, Faculty of Science, University of Oulu, P.O. Box 3000, Oulu, 90014, Finland.
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3
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Hamza A, Németh FB, Madarász Á, Nechaev A, Pihko P, Peljo P, Pápai I. N-alkylated pyridoxal derivatives as negative electrolyte materials for aqueous organic flow batteries: Computational screening. Chemistry 2023:e202300996. [PMID: 37205719 DOI: 10.1002/chem.202300996] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2023] [Revised: 05/19/2023] [Accepted: 05/19/2023] [Indexed: 05/21/2023]
Abstract
N-functionalized pyridinium frameworks derived from the three major vitamers of vitamin B6, pyridoxal, pyridoxamine and pyridoxine, have been screened computationally for consideration as negative electrode materials in aqueous organic flow batteries. A molecular database including the structure and the one-electron standard reduction potential of related pyridinium derivatives has been generated using a computational protocol that combines semiempirical and DFT quantum chemical methods. The predicted reduction potentials span a broad range for the investigated pyridinium frameworks, but pyridoxal derivatives, particularly those involving electron withdrawing substituents, have potentials compatible with the electrochemical stability window of aqueous electrolytes. The stability of radicals formed upon one-electron reduction has been analyzed by a new computational tool proposed recently for large-scale computational screening.
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Affiliation(s)
- Andrea Hamza
- Research Centre for Natural Sciences Institute of Organic Chemistry: Termeszettudomanyi Kutatokozpont Szerves Kemiai Intezet, Institute of Organic Chemistry, HUNGARY
| | - Flóra Boróka Németh
- Research Centre for Natural Sciences Institute of Organic Chemistry: Termeszettudomanyi Kutatokozpont Szerves Kemiai Intezet, Institute of Organic Chemistry, HUNGARY
| | - Ádám Madarász
- Research Centre for Natural Sciences Institute of Organic Chemistry: Termeszettudomanyi Kutatokozpont Szerves Kemiai Intezet, Institute of Organic Chemistry, HUNGARY
| | - Anton Nechaev
- University of Jyväskylä: Jyvaskylan Yliopisto, Department of Chemistry, FINLAND
| | - Petri Pihko
- University of Jyväskylä: Jyvaskylan Yliopisto, Department of Chemistry, FINLAND
| | - Pekka Peljo
- University of Turku: Turun Yliopisto, Materials engineering, FINLAND
| | - Imre Pápai
- Research Centre for Natural Sciences Institute of Organic Chemistry: Termeszettudomanyi Kutatokozpont Szerves Kemiai Intezet, Institute of Organic Chemistry, Magyar Tudosok korutja 2, 1117, Budapest, HUNGARY
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4
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Albitz K, Csókás D, Dobi Z, Pápai I, Soós T. Late-Stage Formal Double C-H Oxidation of Prenylated Molecules to Alkylidene Oxetanes and Azetidines by Strain-Enabled Cross-Metathesis. Angew Chem Int Ed Engl 2023; 62:e202216879. [PMID: 36629402 DOI: 10.1002/anie.202216879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/16/2022] [Revised: 01/10/2023] [Accepted: 01/11/2023] [Indexed: 01/12/2023]
Abstract
Prenylation is a ubiquitous late-stage modification in nature that often confers significantly improved bioactivity for secondary metabolites. While this lipophilic modification renders enhanced potency, the lipophilic tag(s) can diminish bioavailability and adversely alter drug transportation and metabolism. Thus, a functional-group-tolerant, mild, and selective late-stage C-H functionalization of prenyl tags would present a great potential in drug discovery programs but could also impact other fields, such as agrochemistry and chemical biology. Herein we report an exocyclic-strain-driven cross-metathesis reaction of prenyl tags, a formal double C-H oxidation protocol, that can be used for the selective late-stage derivatization of prenylated compounds and natural products. This methodology avoids the need for prefunctionalization of target molecules and affords ready access to an unprecedented library of oxo- and aza-prenylated complex molecules. Thus, in a broader context, this methodology extends late-stage functionalization beyond that available to nature.
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Affiliation(s)
- Krisztián Albitz
- Organocatalysis Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, 2 Magyar tudósok körútja, 1117, Budapest, Hungary.,Hevesy György PhD School of Chemistry, Eötvös Loránd University, 1/A Pázmány Péter sétány, 1117, Budapest, Hungary
| | - Dániel Csókás
- Theoretical Chemistry Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, 2 Magyar tudósok körútja, 1117, Budapest, Hungary
| | - Zoltán Dobi
- Organocatalysis Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, 2 Magyar tudósok körútja, 1117, Budapest, Hungary
| | - Imre Pápai
- Theoretical Chemistry Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, 2 Magyar tudósok körútja, 1117, Budapest, Hungary
| | - Tibor Soós
- Organocatalysis Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, 2 Magyar tudósok körútja, 1117, Budapest, Hungary
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5
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Albitz K, Csókás D, Dobi Z, Pápai I, Soós T. Late‐Stage Formal Double C–H Oxidation of Prenylated Molecules to Alkylidene Oxetanes and Azetidines by Strain‐Enabled Cross‐Metathesis. Angew Chem Int Ed Engl 2023. [DOI: 10.1002/ange.202216879] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Affiliation(s)
- Krisztián Albitz
- HAS RCNS: Termeszettudomanyi Kutatokozpont Institute of Organic Chemistry HUNGARY
| | - Dániel Csókás
- HAS RCNS: Termeszettudomanyi Kutatokozpont Institute of Organic Chemistry HUNGARY
| | - Zoltán Dobi
- HAS RCNS: Termeszettudomanyi Kutatokozpont Institute of Organic Chemistry HUNGARY
| | - Imre Pápai
- HAS RCNS: Termeszettudomanyi Kutatokozpont Institute of Organic Chemistry HUNGARY
| | - Tibor Soós
- Research Centre for Natural Sciences: Termeszettudomanyi Kutatokozpont Institute of Organic Chemistry 2 Magyar tudósok körútja 1117 Budapest HUNGARY
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6
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Riuttamäki S, Laczkó G, Madarász Á, Földes T, Pápai I, Bannykh A, Pihko PM. Carboxylate Catalyzed Isomerization of β,γ‐Unsaturated
N
‐Acetylcysteamine Thioesters**. Chemistry 2022; 28:e202201030. [PMID: 35604200 PMCID: PMC9541288 DOI: 10.1002/chem.202201030] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Indexed: 11/11/2022]
Abstract
We demonstrate herein the capacity of simple carboxylate salts – tetrametylammonium and tetramethylguanidinium pivalate – to act as catalysts in the isomerization of β,γ‐unsaturated thioesters to α,β‐unsaturated thioesters. The carboxylate catalysts gave reaction rates comparable to those obtained with DBU, but with fewer side reactions. The reaction exhibits a normal secondary kinetic isotope effect (k1H/k1D=1.065±0.026) with a β,γ‐deuterated substrate. Computational analysis of the mechanism provides a similar value (k1H/k1D=1.05) with a mechanism where γ‐reprotonation of the enolate intermediate is rate determining.
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Affiliation(s)
- Saara Riuttamäki
- Department of Chemistry University of Jyväskylä P.O. Box 35 40014 Jyväskylä Finland
| | - Gergely Laczkó
- Institute of Organic Chemistry Research Centre for Natural Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Ádám Madarász
- Institute of Organic Chemistry Research Centre for Natural Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Tamás Földes
- Institute of Organic Chemistry Research Centre for Natural Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Imre Pápai
- Institute of Organic Chemistry Research Centre for Natural Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Anton Bannykh
- Department of Chemistry University of Jyväskylä P.O. Box 35 40014 Jyväskylä Finland
| | - Petri M. Pihko
- Department of Chemistry University of Jyväskylä P.O. Box 35 40014 Jyväskylä Finland
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7
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von der Heiden D, Németh FB, Andreasson M, Sethio D, Pápai I, Erdelyi M. Are bis(pyridine)iodine(I) complexes applicable for asymmetric halogenation? Org Biomol Chem 2021; 19:8307-8323. [PMID: 34522944 PMCID: PMC8494190 DOI: 10.1039/d1ob01532j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
Enantiopure halogenated molecules are of tremendous importance as synthetic intermediates in the construction of pharmaceuticals, fragrances, flavours, natural products, pesticides, and functional materials. Enantioselective halofunctionalizations remain poorly understood and generally applicable procedures are lacking. The applicability of chiral trans-chelating bis(pyridine)iodine(i) complexes in the development of substrate independent, catalytic enantioselective halofunctionalization has been explored herein. Six novel chiral bidentate pyridine donor ligands have been designed, routes for their synthesis developed and their [N–I–N]+-type halogen bond complexes studied by 15N NMR and DFT. The chiral complexes encompassing a halogen bond stabilized iodenium ion are shown to be capable of efficient iodenium transfer to alkenes; however, without enantioselectivity. The lack of stereoselectivity is shown to originate from the availability of multiple ligand conformations of comparable energies and an insufficient steric influence by the chiral ligand. Substrate preorganization by the chiral catalyst appears a necessity for enantioselective halofunctionalization. The enantioselectivity of the iodine(i) transfer process from chiral bis(pyridine)iodine(i) complexes to alkenes is explored.![]()
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Affiliation(s)
| | - Flóra Boróka Németh
- Institute of Organic Chemistry, Research Centre for Natural Sciences, H-1117 Budapest, Hungary
| | - Måns Andreasson
- Department of Chemistry and Molecular Biology, University of Gothenburg, SE-412 96 Gothenburg, Sweden
| | - Daniel Sethio
- Department of Chemistry - BMC, Uppsala University, SE-751 23 Uppsala, Sweden.
| | - Imre Pápai
- Institute of Organic Chemistry, Research Centre for Natural Sciences, H-1117 Budapest, Hungary.,Department of Chemistry, University J. Selyeho, 94505 Komárno, Slovakia
| | - Mate Erdelyi
- Department of Chemistry - BMC, Uppsala University, SE-751 23 Uppsala, Sweden.
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8
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Lindblad S, Boróka Németh F, Földes T, Heiden D, Vang HG, Driscoll ZL, Gonnering ER, Pápai I, Bowling N, Erdelyi M. Cover Feature: The Influence of Secondary Interactions on the [N−I−N]
+
Halogen Bond (Chem. Eur. J. 55/2021). Chemistry 2021. [DOI: 10.1002/chem.202103250] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Sofia Lindblad
- Department of Chemistry – BMC Uppsala University 751 23 Uppsala Sweden
| | - Flóra Boróka Németh
- Institute of Organic Chemistry Research Center for Natural Sciences Budapest Hungary
| | - Tamás Földes
- Institute of Organic Chemistry Research Center for Natural Sciences Budapest Hungary
| | - Daniel Heiden
- Department of Chemistry – BMC Uppsala University 751 23 Uppsala Sweden
| | - Herh G. Vang
- Department of Chemistry University of Wisconsin-Stevens Point 2001 Fourth Avenue, Stevens Point Wisconsin 54481 USA
| | - Zakarias L. Driscoll
- Department of Chemistry University of Wisconsin-Stevens Point 2001 Fourth Avenue, Stevens Point Wisconsin 54481 USA
| | - Emily R. Gonnering
- Department of Chemistry University of Wisconsin-Stevens Point 2001 Fourth Avenue, Stevens Point Wisconsin 54481 USA
| | - Imre Pápai
- Institute of Organic Chemistry Research Center for Natural Sciences Budapest Hungary
- Department of Chemistry University J. Selyeho 94505 Komárno Slovakia
| | - Nathan Bowling
- Department of Chemistry University of Wisconsin-Stevens Point 2001 Fourth Avenue, Stevens Point Wisconsin 54481 USA
| | - Mate Erdelyi
- Department of Chemistry – BMC Uppsala University 751 23 Uppsala Sweden
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9
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Lindblad S, Boróka Németh F, Földes T, von der Heiden D, Vang HG, Driscoll ZL, Gonnering ER, Pápai I, Bowling N, Erdelyi M. The Influence of Secondary Interactions on the [N-I-N] + Halogen Bond. Chemistry 2021; 27:13748-13756. [PMID: 34339075 PMCID: PMC8518683 DOI: 10.1002/chem.202102575] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2021] [Indexed: 12/21/2022]
Abstract
[Bis(pyridine)iodine(I)]+ complexes offer controlled access to halonium ions under mild conditions. The reactivity of such stabilized halonium ions is primarily determined by their three-center, four-electron [N-I-N]+ halogen bond. We studied the importance of chelation, strain, steric hindrance and electrostatic interaction for the structure and reactivity of halogen bonded halonium ions by acquiring their 15 N NMR coordination shifts and measuring their iodenium release rates, and interpreted the data with the support of DFT computations. A bidentate ligand stabilizes the [N-I-N]+ halogen bond, decreasing the halenium transfer rate. Strain weakens the bond and accordingly increases the release rate. Remote modifications in the backbone do not influence the stability as long as the effect is entirely steric. Incorporating an electron-rich moiety close by the [N-I-N]+ motif increases the iodenium release rate. The analysis of the iodine(I) transfer mechanism highlights the impact of secondary interactions, and may provide a handle on the induction of stereoselectivity in electrophilic halogenations.
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Affiliation(s)
- Sofia Lindblad
- Department of Chemistry - BMC, Uppsala University, 751 23, Uppsala, Sweden
| | - Flóra Boróka Németh
- Institute of Organic Chemistry, Research Center for Natural Sciences, Budapest, Hungary
| | - Tamás Földes
- Institute of Organic Chemistry, Research Center for Natural Sciences, Budapest, Hungary
| | | | - Herh G Vang
- Department of Chemistry, University of Wisconsin-Stevens Point, 2001 Fourth Avenue, Stevens Point, Wisconsin, 54481, USA
| | - Zakarias L Driscoll
- Department of Chemistry, University of Wisconsin-Stevens Point, 2001 Fourth Avenue, Stevens Point, Wisconsin, 54481, USA
| | - Emily R Gonnering
- Department of Chemistry, University of Wisconsin-Stevens Point, 2001 Fourth Avenue, Stevens Point, Wisconsin, 54481, USA
| | - Imre Pápai
- Institute of Organic Chemistry, Research Center for Natural Sciences, Budapest, Hungary.,Department of Chemistry, University J. Selyeho, 94505, Komárno, Slovakia
| | - Nathan Bowling
- Department of Chemistry, University of Wisconsin-Stevens Point, 2001 Fourth Avenue, Stevens Point, Wisconsin, 54481, USA
| | - Mate Erdelyi
- Department of Chemistry - BMC, Uppsala University, 751 23, Uppsala, Sweden
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10
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Sapsford JS, Csókás D, Turnell-Ritson RC, Parkin LA, Crawford AD, Pápai I, Ashley AE. Transition Metal-Free Direct Hydrogenation of Esters via a Frustrated Lewis Pair. ACS Catal 2021. [DOI: 10.1021/acscatal.1c01940] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
| | - Dániel Csókás
- Research Center for Natural Sciences, Institute of Organic Chemistry, Budapest H-1117, Hungary
| | | | - Liam A. Parkin
- Molecular Sciences Research Hub, Imperial College, London W12 0BZ, U.K
| | | | - Imre Pápai
- Research Center for Natural Sciences, Institute of Organic Chemistry, Budapest H-1117, Hungary
| | - Andrew E. Ashley
- Molecular Sciences Research Hub, Imperial College, London W12 0BZ, U.K
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11
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Ghosh A, Csókás D, Budanović M, Webster RD, Pápai I, Stuparu MC. Synthesis of azahelicenes through Mallory reaction of imine precursors: corannulene substrates provide an exception to the rule in oxidative photocyclizations of diarylethenes. Chem Sci 2021; 12:3977-3983. [PMID: 34163668 PMCID: PMC8179518 DOI: 10.1039/d0sc06730j] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2020] [Accepted: 01/22/2021] [Indexed: 01/07/2023] Open
Abstract
Typically, the synthesis of phenanthrene-based polycyclic aromatic hydrocarbons relies on the Mallory reaction. In this approach, stilbene (PhCH[double bond, length as m-dash]CHPh)-based precursors undergo an oxidative photocyclization reaction to join the two adjacent aromatic rings into an extended aromatic structure. However, if one C[double bond, length as m-dash]C carbon atom is replaced by a nitrogen atom (C[double bond, length as m-dash]N), the synthesis becomes practically infeasible. Here, we show the very first examples of a successful Mallory reaction on stilbene-like imine precursors involving the molecularly curved corannulene nucleus. The isolated yields exceed 90% and the resulting single and double aza[4]helicenes exhibit adjustable high affinity for electrons.
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Affiliation(s)
- Animesh Ghosh
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Dániel Csókás
- Institute of Organic Chemistry, Research Centre for Natural Sciences Magyar Tudósok Körútja 2 H-1117 Budapest Hungary
| | - Maja Budanović
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Richard D Webster
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
| | - Imre Pápai
- Institute of Organic Chemistry, Research Centre for Natural Sciences Magyar Tudósok Körútja 2 H-1117 Budapest Hungary
| | - Mihaiela C Stuparu
- Division of Chemistry and Biological Chemistry, School of Physical and Mathematical Sciences, Nanyang Technological University 21 Nanyang Link Singapore 637371 Singapore
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12
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Turunen L, Németh FB, Decato DA, Pápai I, Berryman OB, Erdélyi M. Halogen Bonds of Iodonium Ions: A World Dissimilar to Silver Coordination. BCSJ 2021. [DOI: 10.1246/bcsj.20200274] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Lotta Turunen
- Department of Chemistry – BMC, Uppsala University, SE-751 23 Uppsala, Sweden
| | - Flóra Boróka Németh
- Institute of Organic Chemistry, Research Centre for Natural Sciences, H-1117 Budapest, Hungary
| | - Daniel A. Decato
- Department of Chemistry and Biochemistry, University of Montana, Missoula, MT 59812, USA
| | - Imre Pápai
- Institute of Organic Chemistry, Research Centre for Natural Sciences, H-1117 Budapest, Hungary
| | - Orion B. Berryman
- Department of Chemistry and Biochemistry, University of Montana, Missoula, MT 59812, USA
| | - Máté Erdélyi
- Department of Chemistry – BMC, Uppsala University, SE-751 23 Uppsala, Sweden
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13
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Hamza A, Sorochkina K, Kótai B, Chernichenko K, Berta D, Bolte M, Nieger M, Repo T, Pápai I. Origin of Stereoselectivity in FLP-Catalyzed Asymmetric Hydrogenation of Imines. ACS Catal 2020. [DOI: 10.1021/acscatal.0c04263] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Andrea Hamza
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Kristina Sorochkina
- Department of Chemistry, University of Helsinki, A. I. Virtasen aukio 1, 00014 Helsinki, Finland
| | - Bianka Kótai
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Konstantin Chernichenko
- Department of Chemistry, University of Helsinki, A. I. Virtasen aukio 1, 00014 Helsinki, Finland
| | - Dénes Berta
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Michael Bolte
- Institute of Inorganic Chemistry, Goethe-University, Max-von-Laue-Strasse 7, D-60438 Frankfurt am Main, Germany
| | - Martin Nieger
- Department of Chemistry, University of Helsinki, A. I. Virtasen aukio 1, 00014 Helsinki, Finland
| | - Timo Repo
- Department of Chemistry, University of Helsinki, A. I. Virtasen aukio 1, 00014 Helsinki, Finland
| | - Imre Pápai
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
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14
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Iashin V, Berta D, Chernichenko K, Nieger M, Moslova K, Pápai I, Repo T. Metal-Free C-H Borylation of N-Heteroarenes by Boron Trifluoride. Chemistry 2020; 26:13873-13879. [PMID: 32478432 PMCID: PMC7702085 DOI: 10.1002/chem.202001436] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 05/28/2020] [Indexed: 01/08/2023]
Abstract
Organoboron compounds are essential reagents in modern C-C coupling reactions. Their synthesis via catalytic C-H borylation by main group elements is emerging as a powerful tool alternative to transition metal based catalysis. Herein, a straightforward metal-free synthesis of aryldifluoroboranes from BF3 and heteroarenes is reported. The reaction is assisted by sterically hindered amines and catalytic amounts of thioureas. According to computational studies the reaction proceeds via frustrated Lewis pair (FLP) mechanism. The obtained aryldifluoroboranes are further stabilized against destructive protodeborylation by converting them to the corresponding air stable tetramethylammonium organotrifluoroborates.
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Affiliation(s)
- Vladimir Iashin
- Department of ChemistryUniversity of HelsinkiA. I. Virtasen aukio, 100014HelsinkiFinland
| | - Dénes Berta
- Institute of Organic ChemistryResearch Centre for Natural SciencesMagyar tudósok körútja 21117BudapestHungary
| | - Konstantin Chernichenko
- Department of ChemistryUniversity of HelsinkiA. I. Virtasen aukio, 100014HelsinkiFinland
- Present address: API Small Molecule DevelopmentJanssen Pharmaceutica N.V.Turnhoutseweg 302340BeerseBelgium
| | - Martin Nieger
- Department of ChemistryUniversity of HelsinkiA. I. Virtasen aukio, 100014HelsinkiFinland
| | - Karina Moslova
- Department of ChemistryUniversity of HelsinkiA. I. Virtasen aukio, 100014HelsinkiFinland
| | - Imre Pápai
- Institute of Organic ChemistryResearch Centre for Natural SciencesMagyar tudósok körútja 21117BudapestHungary
| | - Timo Repo
- Department of ChemistryUniversity of HelsinkiA. I. Virtasen aukio, 100014HelsinkiFinland
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15
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Báti G, Csókás D, Yong T, Tam SM, Shi RRS, Webster RD, Pápai I, García F, Stuparu MC. Mechanochemical Synthesis of Corannulene‐Based Curved Nanographenes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202007815] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Gábor Báti
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 21 Nanyang Link 637371 Singapore Singapore
| | - Dániel Csókás
- Institute of Organic Chemistry Research Centre for Natural Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Teoh Yong
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 21 Nanyang Link 637371 Singapore Singapore
| | - Si Man Tam
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 21 Nanyang Link 637371 Singapore Singapore
| | - Raymond R. S. Shi
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 21 Nanyang Link 637371 Singapore Singapore
| | - Richard D. Webster
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 21 Nanyang Link 637371 Singapore Singapore
| | - Imre Pápai
- Institute of Organic Chemistry Research Centre for Natural Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Felipe García
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 21 Nanyang Link 637371 Singapore Singapore
| | - Mihaiela C. Stuparu
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 21 Nanyang Link 637371 Singapore Singapore
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16
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Báti G, Csókás D, Yong T, Tam SM, Shi RRS, Webster RD, Pápai I, García F, Stuparu MC. Mechanochemical Synthesis of Corannulene‐Based Curved Nanographenes. Angew Chem Int Ed Engl 2020; 59:21620-21626. [DOI: 10.1002/anie.202007815] [Citation(s) in RCA: 21] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2020] [Revised: 08/03/2020] [Indexed: 01/12/2023]
Affiliation(s)
- Gábor Báti
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 21 Nanyang Link 637371 Singapore Singapore
| | - Dániel Csókás
- Institute of Organic Chemistry Research Centre for Natural Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Teoh Yong
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 21 Nanyang Link 637371 Singapore Singapore
| | - Si Man Tam
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 21 Nanyang Link 637371 Singapore Singapore
| | - Raymond R. S. Shi
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 21 Nanyang Link 637371 Singapore Singapore
| | - Richard D. Webster
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 21 Nanyang Link 637371 Singapore Singapore
| | - Imre Pápai
- Institute of Organic Chemistry Research Centre for Natural Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Felipe García
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 21 Nanyang Link 637371 Singapore Singapore
| | - Mihaiela C. Stuparu
- Division of Chemistry and Biological Chemistry School of Physical and Mathematical Sciences Nanyang Technological University Singapore 21 Nanyang Link 637371 Singapore Singapore
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17
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Abstract
The reactivity of halonium ions is conveniently modulated by three-center, four-electron halogen bonds. Such stabilized halonium complexes are valuable reagents for oxidations and halofunctionalization reactions. We report the first example of the stabilization of a halenium ion in a three-center, four-electron halogen bond with two oxygen ligands. The influence of electron density and solvent on the stability of the complexes is assessed. O-I-O halogen bond complexes are applicable as synthetic reagents and as supramolecular synthons.
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Affiliation(s)
- Sofia Lindblad
- Department of Chemistry - BMC, Uppsala University, SE-751 23 Uppsala, Sweden.
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18
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Pápai I, Pihko PM, Siitonen JH, Csókás D. Total Synthesis of Stemoamide, 9a-epi-Stemoamide, and 9a,10-epi-Stemoamide: Divergent Stereochemistry of the Final Methylation Steps. Synlett 2020. [DOI: 10.1055/s-0040-1707201] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
Total syntheses of stemoamide, 9a-epi-stemoamide, and 9a,10-epi-stemoamide by a convergent A + B ring-forming strategy is reported. The synthesis required a diastereoselective late-stage methylation of the ABC stemoamide core that successfully enabled access to three of the four possible diastereomeric structures. For the natural stemoamide series, the diastereoselectivity can be rationalized both by kinetic and thermodynamic arguments, whereas for the natural 9a-epi-stemoamide series, the kinetic selectivity is explained by the prepyramidalization of the relevant enolate.
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Affiliation(s)
- Imre Pápai
- Institute of Organic Chemistry, Research Centre for Natural Sciences
- Institute of Organic Chemistry, Research Centre for Natural Sciences
| | - Petri M. Pihko
- Department of Chemistry and Nanoscience Centre, University of Jyvaskyla
| | - Juha H. Siitonen
- Department of Chemistry and Nanoscience Centre, University of Jyvaskyla
- Institute of Organic Chemistry, Research Centre for Natural Sciences
| | - Dániel Csókás
- Institute of Organic Chemistry, Research Centre for Natural Sciences
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19
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Sapsford JS, Csókás D, Scott DJ, Turnell-Ritson RC, Piascik AD, Pápai I, Ashley AE. Establishing the Role of Triflate Anions in H 2 Activation by a Cationic Triorganotin(IV) Lewis Acid. ACS Catal 2020; 10:7573-7583. [PMID: 32905389 PMCID: PMC7469243 DOI: 10.1021/acscatal.0c02023] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/06/2020] [Revised: 06/05/2020] [Indexed: 12/13/2022]
Abstract
![]()
Cationic
Lewis acids (LAs) are gaining interest as targets for
frustrated Lewis pair (FLP)-mediated catalysis. Unlike neutral boranes,
which are the most prevalent LAs for FLP hydrogenations, the Lewis
acidity of cations can be tuned through modulation of the counteranion;
however, detailed studies on such anion effects are currently lacking
in the literature. Herein, we present experimental and computational
studies which probe the mechanism of H2 activation using iPr3SnOTf (1-OTf) in conjunction
with a coordinating (quinuclidine; qui) and noncoordinating (2,4,6-collidine;
col) base and compare its reactivity with {iPr3Sn·base}{Al[OC(CF3)3]4} (base = qui/col) systems which lack a coordinating anion to investigate
the active species responsible for H2 activation and hence
resolve any mechanistic roles for OTf– in the iPr3SnOTf-mediated pathway.
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Affiliation(s)
- Joshua S. Sapsford
- Molecular Sciences Research Hub, Imperial College, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
| | - Dániel Csókás
- Institute of Organic Chemistry, Research Center for Natural Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary
| | - Daniel J. Scott
- Institute of Inorganic Chemistry, University of Regensburg, Universitätsstraße 31, Regensburg 93051, Germany
| | - Roland C. Turnell-Ritson
- Molecular Sciences Research Hub, Imperial College, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
| | - Adam D. Piascik
- Molecular Sciences Research Hub, Imperial College, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
| | - Imre Pápai
- Institute of Organic Chemistry, Research Center for Natural Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary
| | - Andrew E. Ashley
- Molecular Sciences Research Hub, Imperial College, White City Campus, 80 Wood Lane, London W12 0BZ, U.K
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20
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Csókás D, Siitonen JH, Pihko PM, Pápai I. Conformationally Locked Pyramidality Explains the Diastereoselectivity in the Methylation of trans-Fused Butyrolactones. Org Lett 2020; 22:4597-4601. [PMID: 32338517 PMCID: PMC7309317 DOI: 10.1021/acs.orglett.0c01008] [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] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
![]()
A stereoselectivity
model inspired by the total synthesis of stemona
alkaloids is developed to explain why enolate-derived 3,4-fused butyrolactones
are methylated with a preference for syn alkylation.
The model shows how conformational locking present in nonplanar enolate
structures favors syn over anti methylation,
due to less significant structural distortions in the syn pathway. The developed model was also successfully used to rationalize
selectivities of previously documented methylation reactions.
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Affiliation(s)
- Dániel Csókás
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Juha H Siitonen
- Department of Chemistry, Nanoscience Centre, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - Petri M Pihko
- Department of Chemistry, Nanoscience Centre, University of Jyväskylä, P.O. Box 35, FI-40014 Jyväskylä, Finland
| | - Imre Pápai
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
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21
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Yasui M, Yamada A, Tsukano C, Hamza A, Pápai I, Takemoto Y. Enantioselective Acetalization by Dynamic Kinetic Resolution for the Synthesis of γ‐Alkoxybutenolides by Thiourea/Quaternary Ammonium Salt Catalysts: Application to Strigolactones. Angew Chem Int Ed Engl 2020; 59:13479-13483. [DOI: 10.1002/anie.202002129] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2020] [Revised: 04/23/2020] [Indexed: 12/19/2022]
Affiliation(s)
- Motohiro Yasui
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku Kyoto 606-8501 Japan
| | - Ayano Yamada
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku Kyoto 606-8501 Japan
| | - Chihiro Tsukano
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku Kyoto 606-8501 Japan
| | - Andrea Hamza
- Institute of Organic Chemistry Research Centre for Natural Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Imre Pápai
- Institute of Organic Chemistry Research Centre for Natural Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku Kyoto 606-8501 Japan
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22
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Yasui M, Yamada A, Tsukano C, Hamza A, Pápai I, Takemoto Y. Enantioselective Acetalization by Dynamic Kinetic Resolution for the Synthesis of γ‐Alkoxybutenolides by Thiourea/Quaternary Ammonium Salt Catalysts: Application to Strigolactones. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202002129] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Motohiro Yasui
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku Kyoto 606-8501 Japan
| | - Ayano Yamada
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku Kyoto 606-8501 Japan
| | - Chihiro Tsukano
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku Kyoto 606-8501 Japan
| | - Andrea Hamza
- Institute of Organic Chemistry Research Centre for Natural Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Imre Pápai
- Institute of Organic Chemistry Research Centre for Natural Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences Kyoto University Yoshida, Sakyo-ku Kyoto 606-8501 Japan
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23
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Reiersølmoen AC, Csókás D, Øien-Ødegaard S, Vanderkooy A, Gupta AK, Carlsson ACC, Orthaber A, Fiksdahl A, Pápai I, Erdélyi M. Catalytic Activity of trans-Bis(pyridine)gold Complexes. J Am Chem Soc 2020; 142:6439-6446. [PMID: 32168451 PMCID: PMC7343288 DOI: 10.1021/jacs.0c01941] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
![]()
Gold
catalysis has become one of the fastest growing fields in
chemistry, providing new organic transformations and offering excellent
chemoselectivities under mild reaction conditions. Methodological
developments have been driven by wide applicability in the synthesis
of complex structures, whereas the mechanistic understanding of Au(III)-mediated
processes remains scanty and have become the Achilles’ heel
of methodology development. Herein, the systematic investigation of
the reactivity of bis(pyridine)-ligated Au(III) complexes is presented,
based on NMR spectroscopic, X-ray crystallographic, and DFT data.
The electron density of pyridines modulates the catalytic activity
of Au(III) complexes in propargyl ester cyclopropanation of styrene.
To avoid strain induced by a ligand with a nonoptimal nitrogen–nitrogen
distance, bidentate bis(pyridine)–Au(III) complexes convert
into dimers. For the first time, bis(pyridine)Au(I) complexes are
shown to be catalytically active, with their reactivity being modulated
by strain.
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Affiliation(s)
- Ann Christin Reiersølmoen
- Department of Chemistry, Norwegian University of Science and Technology, Høgskoleringen 5, 7491 Trondheim, Norway
| | - Dániel Csókás
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H1117 Budapest, Hungary
| | - Sigurd Øien-Ødegaard
- Centre for Material Sciences and Nanotechnology, University of Oslo, Sem Sælands vei 26, 0371 Oslo, Norway
| | - Alan Vanderkooy
- Department of Chemistry, BMC Uppsala University, Husargatan 3, 752 37 Uppsala, Sweden
| | - Arvind Kumar Gupta
- Department of Organic Chemistry - Ångström Laboratory, Uppsala University, Lägerhyddsvägen 1, 751 20 Uppsala, Sweden
| | - Anna-Carin C Carlsson
- Department of Chemistry and Molecular Biology, University of Gothenburg, SE-412 96 Gothenburg, Sweden
| | - Andreas Orthaber
- Department of Organic Chemistry - Ångström Laboratory, Uppsala University, Lägerhyddsvägen 1, 751 20 Uppsala, Sweden
| | - Anne Fiksdahl
- Department of Chemistry, Norwegian University of Science and Technology, Høgskoleringen 5, 7491 Trondheim, Norway
| | - Imre Pápai
- Institute of Organic Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H1117 Budapest, Hungary.,Department of Chemistry, University J. Selyeho, 94505 Komárno, Slovakia
| | - Máté Erdélyi
- Department of Chemistry, BMC Uppsala University, Husargatan 3, 752 37 Uppsala, Sweden
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24
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Neuvonen AJ, Noutsias D, Topić F, Rissanen K, Földes T, Pápai I, Pihko PM. Dynamic Refolding of Ion-Pair Catalysts in Response to Different Anions. J Org Chem 2019; 84:15009-15019. [PMID: 31536339 DOI: 10.1021/acs.joc.9b01980] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Four distinct folding patterns are identified in two foldamer-type urea-thiourea catalysts bearing a basic dimethylamino unit by a combination of X-ray crystallography, solution NMR studies, and computational studies (DFT). These patterns are characterized by different intramolecular hydrogen bonding schemes that arise largely from different thiourea conformers. The free base forms of the catalysts are characterized by folds where the intramolecular hydrogen bonds between the urea and the thiourea units remain intact. In contrast, the catalytically relevant salt forms of the catalyst, where the catalyst forms an ion pair with the substrate or substrate analogues, appear in two entirely different folding patterns. With larger anions that mimic the dialkyl malonate substrates, the catalysts maintain their native fold both in the solid state and in solution, but with smaller halide anions (fluoride, chloride, and bromide), the catalysts fold around the halide anion (anion receptor fold), and the intramolecular hydrogen bonds are disrupted. Titration of catalyst hexafluoroacetylacetonate salt with tetra-n-butylammonium chloride results in dynamic refolding of the catalyst from the native fold to the anion receptor fold.
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Affiliation(s)
- Antti J Neuvonen
- Department of Chemistry and NanoScience Center , University of Jyväskylä , FI-40014 Jyväskylä , Finland
| | - Dimitris Noutsias
- Department of Chemistry and NanoScience Center , University of Jyväskylä , FI-40014 Jyväskylä , Finland
| | - Filip Topić
- Department of Chemistry and NanoScience Center , University of Jyväskylä , FI-40014 Jyväskylä , Finland
| | - Kari Rissanen
- Department of Chemistry and NanoScience Center , University of Jyväskylä , FI-40014 Jyväskylä , Finland
| | - Tamás Földes
- Institute of Organic Chemistry, Research Centre for Natural Sciences , Hungarian Academy of Sciences , Magyar tudósok körútja 2 , H-1117 Budapest , Hungary
| | - Imre Pápai
- Institute of Organic Chemistry, Research Centre for Natural Sciences , Hungarian Academy of Sciences , Magyar tudósok körútja 2 , H-1117 Budapest , Hungary
| | - Petri M Pihko
- Department of Chemistry and NanoScience Center , University of Jyväskylä , FI-40014 Jyväskylä , Finland
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25
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Abstract
Gold-mediated homogeneous catalysis is a powerful tool for construction of valuable molecules and has lately received growing attention. Whereas Au(I)-catalyzed processes have become well established, those mediated by Au(III) have so far barely been explored, and their mechanistic understanding remains basic. Herein, we disclose the combined NMR spectroscopic, single-crystal X-ray crystallographic, and computational (DFT) investigation of the Au(III)-mediated alkoxycyclization of a 1,6-enyne in the presence of a bidentate pyridine-oxazoline ligand. The roles of the counterion, the solvent, and the type of Au(III) complex have been assessed. Au(III) is demonstrated to be the active catalyst in alkoxycyclization. Alkyne coordination to Au(III) involves decoordination of the pyridine nitrogen and is the rate-limiting step.
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Affiliation(s)
- Ann Christin Reiersølmoen
- Department of Chemistry , Norwegian University of Science and Technology , Høgskoleringen 5 , 7491 Trondheim , Norway
| | - Dániel Csókás
- Institute of Organic Chemistry, Research Centre for Natural Sciences , Hungarian Academy of Sciences , Magyar tudósok körútja 2 , H-1117 Budapest , Hungary
| | - Imre Pápai
- Institute of Organic Chemistry, Research Centre for Natural Sciences , Hungarian Academy of Sciences , Magyar tudósok körútja 2 , H-1117 Budapest , Hungary
| | - Anne Fiksdahl
- Department of Chemistry , Norwegian University of Science and Technology , Høgskoleringen 5 , 7491 Trondheim , Norway
| | - Máté Erdélyi
- Department of Chemistry , BMC Uppsala University , Husargatan 3 , 752 37 Uppsala , Sweden
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26
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Vanderkooy A, Gupta AK, Földes T, Lindblad S, Orthaber A, Pápai I, Erdélyi M. Frontispiece: Halogen Bonding Helicates Encompassing Iodonium Cations. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/anie.201982761] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Alan Vanderkooy
- Department of Chemistry—BMCUppsala Universitet Husargatan 3 752 37 Uppsala Sweden
| | - Arvind Kumar Gupta
- Department of Chemistry—Ångström LaboratoryUppsala Universitet Lägerhyddsvägen 1 751 20 Uppsala Sweden
| | - Tamás Földes
- Institute of Organic ChemistryResearch Center for Natural SciencesHungarian Academy of Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
- Present address: Department of ChemistryKing's College London London SE1 1DB UK
| | - Sofia Lindblad
- Department of Chemistry—BMCUppsala Universitet Husargatan 3 752 37 Uppsala Sweden
| | - Andreas Orthaber
- Department of Chemistry—Ångström LaboratoryUppsala Universitet Lägerhyddsvägen 1 751 20 Uppsala Sweden
| | - Imre Pápai
- Institute of Organic ChemistryResearch Center for Natural SciencesHungarian Academy of Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Máté Erdélyi
- Department of Chemistry—BMCUppsala Universitet Husargatan 3 752 37 Uppsala Sweden
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27
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Vanderkooy A, Gupta AK, Földes T, Lindblad S, Orthaber A, Pápai I, Erdélyi M. Halogen Bonding Helicates Encompassing Iodonium Cations. Angew Chem Int Ed Engl 2019; 58:9012-9016. [PMID: 31074942 PMCID: PMC6773207 DOI: 10.1002/anie.201904817] [Citation(s) in RCA: 50] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2019] [Revised: 05/06/2019] [Indexed: 12/16/2022]
Abstract
The first halonium-ion-based helices were designed and synthesized using oligo-aryl/pyridylene-ethynylene backbones that fold around reactive iodonium ions. Halogen bonding interactions stabilize the iodonium ions within the helices. Remarkably, the distance between two iodonium ions within a helix is shorter than the sum of their van der Waals radii. The helical conformations were characterized by X-ray crystallography in the solid state, by NMR spectroscopy in solution and corroborated by DFT calculations. The helical complexes possess potential synthetic utility, as demonstrated by their ability to induce iodocyclization of 4-penten-1-ol.
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Affiliation(s)
- Alan Vanderkooy
- Department of Chemistry-BMC, Uppsala Universitet, Husargatan 3, 752 37, Uppsala, Sweden
| | - Arvind Kumar Gupta
- Department of Chemistry-Ångström Laboratory, Uppsala Universitet, Lägerhyddsvägen 1, 751 20, Uppsala, Sweden
| | - Tamás Földes
- Institute of Organic Chemistry, Research Center for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, 1117, Budapest, Hungary.,Present address: Department of Chemistry, King's College London, London, SE1 1DB, UK
| | - Sofia Lindblad
- Department of Chemistry-BMC, Uppsala Universitet, Husargatan 3, 752 37, Uppsala, Sweden
| | - Andreas Orthaber
- Department of Chemistry-Ångström Laboratory, Uppsala Universitet, Lägerhyddsvägen 1, 751 20, Uppsala, Sweden
| | - Imre Pápai
- Institute of Organic Chemistry, Research Center for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, 1117, Budapest, Hungary
| | - Máté Erdélyi
- Department of Chemistry-BMC, Uppsala Universitet, Husargatan 3, 752 37, Uppsala, Sweden
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28
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Vanderkooy A, Gupta AK, Földes T, Lindblad S, Orthaber A, Pápai I, Erdélyi M. Halogen Bonding Helicates Encompassing Iodonium Cations. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201904817] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Alan Vanderkooy
- Department of Chemistry—BMCUppsala Universitet Husargatan 3 752 37 Uppsala Sweden
| | - Arvind Kumar Gupta
- Department of Chemistry—Ångström LaboratoryUppsala Universitet Lägerhyddsvägen 1 751 20 Uppsala Sweden
| | - Tamás Földes
- Institute of Organic ChemistryResearch Center for Natural SciencesHungarian Academy of Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
- Present address: Department of ChemistryKing's College London London SE1 1DB UK
| | - Sofia Lindblad
- Department of Chemistry—BMCUppsala Universitet Husargatan 3 752 37 Uppsala Sweden
| | - Andreas Orthaber
- Department of Chemistry—Ångström LaboratoryUppsala Universitet Lägerhyddsvägen 1 751 20 Uppsala Sweden
| | - Imre Pápai
- Institute of Organic ChemistryResearch Center for Natural SciencesHungarian Academy of Sciences Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Máté Erdélyi
- Department of Chemistry—BMCUppsala Universitet Husargatan 3 752 37 Uppsala Sweden
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29
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Daru J, Bakó I, Stirling A, Pápai I. Mechanism of Heterolytic Hydrogen Splitting by Frustrated Lewis Pairs: Comparison of Static and Dynamic Models. ACS Catal 2019. [DOI: 10.1021/acscatal.9b01137] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- János Daru
- Research Center for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary
| | - Imre Bakó
- Research Center for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary
| | - András Stirling
- Research Center for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary
| | - Imre Pápai
- Research Center for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, Budapest H-1117, Hungary
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30
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Turnell-Ritson RC, Sapsford JS, Cooper RT, Lee SS, Földes T, Hunt PA, Pápai I, Ashley AE. Base-induced reversible H 2 addition to a single Sn(ii) centre. Chem Sci 2018; 9:8716-8722. [PMID: 30627391 PMCID: PMC6289099 DOI: 10.1039/c8sc03110j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 09/17/2018] [Indexed: 12/02/2022] Open
Abstract
A range of amines catalyse the oxidative addition (OA) of H2 to [(Me3Si)2CH]2Sn (1), forming [(Me3Si)2CH]2SnH2 (2). Experimental and computational studies point to 'frustrated Lewis pair' mechanisms in which 1 acts as a Lewis acid and involve unusual late transition states; this is supported by the observation of a kinetic isotope effect for Et3N. When DBU is used the energetics of H2 activation are altered, allowing an equilibrium between 1, 2 and adduct [1·DBU] to be established, thus demonstrating reversible oxidative addition/reductive elimination (RE) of H2 at a single main group centre.
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Affiliation(s)
| | - Joshua S Sapsford
- Department of Chemistry , Imperial College London , London , SW7 2AZ , UK .
| | - Robert T Cooper
- Department of Chemistry , Imperial College London , London , SW7 2AZ , UK .
| | - Stella S Lee
- Department of Chemistry , Imperial College London , London , SW7 2AZ , UK .
| | - Tamás Földes
- Research Center for Natural Sciences , Hungarian Academy of Sciences , Magyar tudósok körútja 2 , H-1117 Budapest , Hungary .
| | - Patricia A Hunt
- Department of Chemistry , Imperial College London , London , SW7 2AZ , UK .
| | - Imre Pápai
- Research Center for Natural Sciences , Hungarian Academy of Sciences , Magyar tudósok körútja 2 , H-1117 Budapest , Hungary .
| | - Andrew E Ashley
- Department of Chemistry , Imperial College London , London , SW7 2AZ , UK .
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31
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Hayama N, Kuramoto R, Földes T, Nishibayashi K, Kobayashi Y, Pápai I, Takemoto Y. Mechanistic Insight into Asymmetric Hetero-Michael Addition of α,β-Unsaturated Carboxylic Acids Catalyzed by Multifunctional Thioureas. J Am Chem Soc 2018; 140:12216-12225. [PMID: 30215516 DOI: 10.1021/jacs.8b07511] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
Carboxylic acids and their corresponding carboxylate anions are generally utilized as Brønsted acids/bases and oxygen nucleophiles in organic synthesis. However, a few asymmetric reactions have used carboxylic acids as electrophiles. Although chiral thioureas bearing both arylboronic acid and tertiary amine were found to promote the aza-Michael addition of BnONH2 to α,β-unsaturated carboxylic acids with moderate to good enantioselectivities, the reaction mechanism remains to be clarified. Detailed investigation of the reaction using spectroscopic analysis and kinetic studies identified tetrahedral borate complexes, comprising two carboxylate anions, as reaction intermediates. We realized a dramatic improvement in product enantioselectivity with the addition of 1 equiv of benzoic acid. In this aza-Michael reaction, the boronic acid not only activates the carboxylate ligand as a Lewis acid, together with the thiourea NH-protons, but also functions as a Brønsted base through a benzoyloxy anion to activate the nucleophile. Moreover, molecular sieves were found to play an important role in generating the ternary borate complexes, which were crucial for obtaining high enantioselectivity as demonstrated by DFT calculations. We also designed a new thiourea catalyst for the intramolecular oxa-Michael addition to suppress another catalytic pathway via a binary borate complex using steric hindrance between the catalyst and substrate. Finally, to demonstrate the synthetic versatility of both hetero-Michael additions, we used them to accomplish the asymmetric synthesis of key intermediates in pharmaceutically important molecules, including sitagliptin and α-tocopherol.
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Affiliation(s)
- Noboru Hayama
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Ryuta Kuramoto
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Tamás Földes
- Institute of Organic Chemistry, Research Centre for Natural Sciences , Hungarian Academy of Sciences , Magyar tudósok körútja 2 , H-1117 Budapest , Hungary
| | - Kazuya Nishibayashi
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Yusuke Kobayashi
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
| | - Imre Pápai
- Institute of Organic Chemistry, Research Centre for Natural Sciences , Hungarian Academy of Sciences , Magyar tudósok körútja 2 , H-1117 Budapest , Hungary
| | - Yoshiji Takemoto
- Graduate School of Pharmaceutical Sciences , Kyoto University , Yoshida, Sakyo-ku, Kyoto 606-8501 , Japan
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32
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Lücke AL, Wiechmann S, Freese T, Nieger M, Földes T, Pápai I, Gjikaj M, Adam A, Schmidt A. Anionic N-heterocyclic carbenes by decarboxylation of sydnone-4-carboxylates. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.03.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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33
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Abstract
The synthesis of a new iridium(I) complex containing an enamido phosphine anion (dbuP- ) and its unique reactivity with CO2 is reported. The complex binds two equivalents of CO2 and initiates a highly selective reaction cascade. The reaction leads to the reversible cleavage of CO2 and the enamido ligand as well. Computational analysis points to the existence of a relatively stable Ir-CO2 complex as a reaction intermediate prior to CO2 cleavage, which was confirmed experimentally. The observed transformation resembles several aspects of enzymatic CO2 fixation by RuBisCO.
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Affiliation(s)
- Jens Langer
- Inorganic and Organometallic Chemistry, Friedrich-Alexander University Erlangen-Nürnberg, Egerlandstraße 1, 91058, Erlangen, Germany
| | - Andrea Hamza
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117, Budapest, Hungary
| | - Imre Pápai
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117, Budapest, Hungary
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34
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Affiliation(s)
- Jens Langer
- Anorganische und Metallorganische Chemie; Friedrich-Alexander-Universität Erlangen-Nürnberg; Egerlandstraße 1 91058 Erlangen Deutschland
| | - Andrea Hamza
- Research Centre for Natural Sciences; Hungarian Academy of Sciences; Magyar tudósok körútja 2 H-1117 Budapest Ungarn
| | - Imre Pápai
- Research Centre for Natural Sciences; Hungarian Academy of Sciences; Magyar tudósok körútja 2 H-1117 Budapest Ungarn
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35
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Földes T, Madarász Á, Révész Á, Dobi Z, Varga S, Hamza A, Nagy PR, Pihko PM, Pápai I. Stereocontrol in Diphenylprolinol Silyl Ether Catalyzed Michael Additions: Steric Shielding or Curtin–Hammett Scenario? J Am Chem Soc 2017; 139:17052-17063. [DOI: 10.1021/jacs.7b07097] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Affiliation(s)
- Tamás Földes
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Ádám Madarász
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Ágnes Révész
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Zoltán Dobi
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Szilárd Varga
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Andrea Hamza
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Péter R. Nagy
- MTA-BME
Lendület Quantum Chemistry Research Group, Department of Physical
Chemistry and Materials Science, Budapest University of Technology and Economics, P.O. Box 91, H-1521 Budapest, Hungary
| | - Petri M. Pihko
- Department
of Chemistry and NanoScience Center, University of Jyväskylä, FI-40014 Jyväskylä, Finland
| | - Imre Pápai
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
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36
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Dorkó É, Kótai B, Földes T, Gyömöre Á, Pápai I, Soós T. Correlating electronic and catalytic properties of frustrated Lewis pairs for imine hydrogenation. J Organomet Chem 2017. [DOI: 10.1016/j.jorganchem.2017.04.031] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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37
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Mayer I, Pápai I, Bakó I, Nagy Á. Conceptual Problem with Calculating Electron Densities in Finite Basis Density Functional Theory. J Chem Theory Comput 2017; 13:3961-3963. [DOI: 10.1021/acs.jctc.7b00562] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- István Mayer
- Institute of Organic Chemistry,
Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest H-1117, Hungary
| | - Imre Pápai
- Institute of Organic Chemistry,
Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest H-1117, Hungary
| | - Imre Bakó
- Institute of Organic Chemistry,
Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest H-1117, Hungary
| | - Ágnes Nagy
- Department of Theoretical
Physics, Debrecen University, Debrecen H-4010, Hungary
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38
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Dorkó É, Szabó M, Kótai B, Pápai I, Domján A, Soós T. Expanding the Boundaries of Water-Tolerant Frustrated Lewis Pair Hydrogenation: Enhanced Back Strain in the Lewis Acid Enables the Reductive Amination of Carbonyls. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201703591] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Éva Dorkó
- Institute of Organic Chemistry; Hungarian Academy of Sciences; Research Centre for Natural Sciences; Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Márk Szabó
- NMR Research Laboratory of IC; Hungarian Academy of Sciences; Research Centre for Natural Sciences; Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Bianka Kótai
- Institute of Organic Chemistry; Hungarian Academy of Sciences; Research Centre for Natural Sciences; Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Imre Pápai
- Institute of Organic Chemistry; Hungarian Academy of Sciences; Research Centre for Natural Sciences; Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Attila Domján
- NMR Research Laboratory of IC; Hungarian Academy of Sciences; Research Centre for Natural Sciences; Magyar tudósok körútja 2 1117 Budapest Hungary
| | - Tibor Soós
- Institute of Organic Chemistry; Hungarian Academy of Sciences; Research Centre for Natural Sciences; Magyar tudósok körútja 2 1117 Budapest Hungary
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39
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Dorkó É, Szabó M, Kótai B, Pápai I, Domján A, Soós T. Expanding the Boundaries of Water-Tolerant Frustrated Lewis Pair Hydrogenation: Enhanced Back Strain in the Lewis Acid Enables the Reductive Amination of Carbonyls. Angew Chem Int Ed Engl 2017; 56:9512-9516. [PMID: 28591474 DOI: 10.1002/anie.201703591] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2017] [Revised: 05/21/2017] [Indexed: 12/20/2022]
Abstract
The development of a boron/nitrogen-centered frustrated Lewis pair (FLP) with remarkably high water tolerance is presented. As systematic steric tuning of the boron-based Lewis acid (LA) component revealed, the enhanced back-strain makes water binding increasingly reversible in the presence of relatively strong base. This advance allows the limits of FLP's hydrogenation to be expanded, as demonstrated by the FLP reductive amination of carbonyls. This metal-free catalytic variant displays a notably broad chemoselectivity and generality.
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Affiliation(s)
- Éva Dorkó
- Institute of Organic Chemistry, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Magyar tudósok körútja 2, 1117, Budapest, Hungary
| | - Márk Szabó
- NMR Research Laboratory of IC, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Magyar tudósok körútja 2, 1117, Budapest, Hungary
| | - Bianka Kótai
- Institute of Organic Chemistry, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Magyar tudósok körútja 2, 1117, Budapest, Hungary
| | - Imre Pápai
- Institute of Organic Chemistry, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Magyar tudósok körútja 2, 1117, Budapest, Hungary
| | - Attila Domján
- NMR Research Laboratory of IC, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Magyar tudósok körútja 2, 1117, Budapest, Hungary
| | - Tibor Soós
- Institute of Organic Chemistry, Hungarian Academy of Sciences, Research Centre for Natural Sciences, Magyar tudósok körútja 2, 1117, Budapest, Hungary
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40
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Affiliation(s)
- Antti J. Neuvonen
- Department
of Chemistry and NanoScience Center, University of Jyväskylä, FI-40014 Jyväskylän yliopisto, Finland
| | - Tamás Földes
- Research
Center for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok
körútja 2, H-1117 Budapest, Hungary
| | - Ádám Madarász
- Research
Center for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok
körútja 2, H-1117 Budapest, Hungary
| | - Imre Pápai
- Research
Center for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok
körútja 2, H-1117 Budapest, Hungary
| | - Petri M. Pihko
- Department
of Chemistry and NanoScience Center, University of Jyväskylä, FI-40014 Jyväskylän yliopisto, Finland
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41
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Dibenedetto A, Roth CE, Aresta M, Pápai I. Synthesis and Characterization of Fe 0 (2,2'-bipyridine) (2-aminoethyl-pyridine) and its Reaction with Dihydrogen. ChemSusChem 2017; 10:220-225. [PMID: 27860409 DOI: 10.1002/cssc.201601026] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Revised: 09/22/2016] [Indexed: 06/06/2023]
Abstract
Fe0 (bpy)(pyea) (2; bpy=2,2'-bipyridine, pyea=2-aminoethyl-pyridine), a 16-electron species, was synthesized by reduction of FeCl2 (bpy)(pyea) (1) using Na-strips. It is a diamagnetic low-melting solid (m.p. 295 K) stable under N2 and easily decomposed by radiations even at low temperature. It was fully characterized by elemental analyses and multinuclear NMR. Complex 2 acts as an active hydrogenation catalyst, but has a very short lifetime. In fact, it reacts with H2 (0.1-1 MPa) at room temperature in toluene and affords in a few minutes a new Fe0 complex characterized as Fe0 (bpy)(η6 -picoline) (3), inactive to hydrogenation. Picoline is derived from the sp3 -sp3 C-C bond cleavage of the aminoethyl arm of the pyea ligand. The rapid evolution of the putative intermediate FeH2 (bpy)(pyea) (4) has not allowed the isolation such Fe-hydrido species. The interaction of H2 with 2 has been studied by DFT, which has allowed to demonstrate that 3 is lower in energy than 2+H2 , justifying the fact that the intermediate dihydride was not isolated. Interestingly, 3 was also obtained by reaction of 1 with NaBH4 or with glycerol-KOH. Complex 2 is one of the rare examples of Fe0 complex stabilized by a set of only N-donor atoms. The reaction with glycerol confirms the potential role of Fe in catalytic hydrogenation reactions using bio-glycerol as a H-source.
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Affiliation(s)
- Angela Dibenedetto
- Interuniversity Consortium Chemical Reactivity and Catalysis (CIRCC), via Celso Ulpiani 27, 70126, Bari, Italy
- Department of Chemistry, University of Bari, Campus Universitario, 70125, Bari, Italy
| | - Cristina E Roth
- Interuniversity Consortium Chemical Reactivity and Catalysis (CIRCC), via Celso Ulpiani 27, 70126, Bari, Italy
| | - Michele Aresta
- Interuniversity Consortium Chemical Reactivity and Catalysis (CIRCC), via Celso Ulpiani 27, 70126, Bari, Italy
- Department of Chemical and Biomolecular Engineering, National University of Sinapore, Engineering Drive 4, Singapore, 117585, SG, Singapore
| | - Imre Pápai
- Hungarian Academy of Sciences, Budapest, Hungary
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42
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Chernichenko K, Kótai B, Nieger M, Heikkinen S, Pápai I, Repo T. Replacing C6F5 groups with Cl and H atoms in frustrated Lewis pairs: H2 additions and catalytic hydrogenations. Dalton Trans 2017; 46:2263-2269. [DOI: 10.1039/c6dt04649e] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Frustrated Lewis isosteres: 2-aminophenylboranes containing C6F5 groups replaced with Cl atoms show similar reactivity with H2 including catalytic hydrogenations.
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Affiliation(s)
| | - B. Kótai
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- Budapest
- Hungary
| | - M. Nieger
- Department of Chemistry
- University of Helsinki
- Finland
| | - S. Heikkinen
- Department of Chemistry
- University of Helsinki
- Finland
| | - I. Pápai
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- Budapest
- Hungary
| | - T. Repo
- Department of Chemistry
- University of Helsinki
- Finland
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43
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Iashin V, Chernichenko K, Pápai I, Repo T. Atom-Efficient Synthesis of Alkynylfluoroborates Using BF3
-Based Frustrated Lewis Pairs. Angew Chem Int Ed Engl 2016; 55:14146-14150. [DOI: 10.1002/anie.201608520] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Indexed: 01/04/2023]
Affiliation(s)
- Vladimir Iashin
- Department of Chemistry; University of Helsinki; A. I. Virtasen aukio 1, FI- 00014 Helsinki Finland
| | - Konstantin Chernichenko
- Department of Chemistry; University of Helsinki; A. I. Virtasen aukio 1, FI- 00014 Helsinki Finland
| | - Imre Pápai
- Research Centre for Natural Sciences; Hungarian Academy of Sciences; Magyar tudósok körútja 2, H- 1117 Budapest Hungary
| | - Timo Repo
- Department of Chemistry; University of Helsinki; A. I. Virtasen aukio 1, FI- 00014 Helsinki Finland
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44
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Iashin V, Chernichenko K, Pápai I, Repo T. Atom-Efficient Synthesis of Alkynylfluoroborates Using BF3
-Based Frustrated Lewis Pairs. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201608520] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Affiliation(s)
- Vladimir Iashin
- Department of Chemistry; University of Helsinki; A. I. Virtasen aukio 1, FI- 00014 Helsinki Finland
| | - Konstantin Chernichenko
- Department of Chemistry; University of Helsinki; A. I. Virtasen aukio 1, FI- 00014 Helsinki Finland
| | - Imre Pápai
- Research Centre for Natural Sciences; Hungarian Academy of Sciences; Magyar tudósok körútja 2, H- 1117 Budapest Hungary
| | - Timo Repo
- Department of Chemistry; University of Helsinki; A. I. Virtasen aukio 1, FI- 00014 Helsinki Finland
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45
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Kovács K, He S, Míle V, Földes T, Pápai I, Takács E, Wojnárovits L. Ionizing radiation induced degradation of monuron in dilute aqueous solution. Radiat Phys Chem Oxf Engl 1993 2016. [DOI: 10.1016/j.radphyschem.2015.10.028] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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46
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Affiliation(s)
- Ádám Madarász
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Zsolt Dósa
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Szilárd Varga
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Tibor Soós
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Antal Csámpai
- Institute
of Chemistry, Eötvös Loránd University, P.O. Box 32, H-1518 Budapest-112, Hungary
| | - Imre Pápai
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
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47
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Chernichenko K, Lindqvist M, Kótai B, Nieger M, Sorochkina K, Pápai I, Repo T. Metal-Free sp2-C–H Borylation as a Common Reactivity Pattern of Frustrated 2-Aminophenylboranes. J Am Chem Soc 2016; 138:4860-8. [DOI: 10.1021/jacs.6b00819] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Konstantin Chernichenko
- Department
of Chemistry, University of Helsinki, A. I. Virtasen aukio 1, P.O. Box 55, 00014 Helsinki, Finland
| | - Markus Lindqvist
- Department
of Chemistry, University of Helsinki, A. I. Virtasen aukio 1, P.O. Box 55, 00014 Helsinki, Finland
| | - Bianka Kótai
- Research
Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok
körútja 2, H-1117 Budapest, Hungary
| | - Martin Nieger
- Department
of Chemistry, University of Helsinki, A. I. Virtasen aukio 1, P.O. Box 55, 00014 Helsinki, Finland
| | - Kristina Sorochkina
- Department
of Chemistry, University of Helsinki, A. I. Virtasen aukio 1, P.O. Box 55, 00014 Helsinki, Finland
| | - Imre Pápai
- Research
Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok
körútja 2, H-1117 Budapest, Hungary
| | - Timo Repo
- Department
of Chemistry, University of Helsinki, A. I. Virtasen aukio 1, P.O. Box 55, 00014 Helsinki, Finland
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48
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Zhivonitko VV, Sorochkina K, Chernichenko K, Kótai B, Földes T, Pápai I, Telkki VV, Repo T, Koptyug I. Nuclear spin hyperpolarization with ansa-aminoboranes: a metal-free perspective for parahydrogen-induced polarization. Phys Chem Chem Phys 2016; 18:27784-27795. [DOI: 10.1039/c6cp05211h] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
A series of new ansa-aminoboranes was analyzed experimentally and theoretically for metal-free production of parahydrogen-induced polarization.
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Affiliation(s)
- Vladimir V. Zhivonitko
- Laboratory of Magnetic Resonance Microimaging
- International Tomography Center SB RAS
- 630090 Novosibirsk
- Russia
- Department of Natural Sciences
| | | | | | - Bianka Kótai
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1117 Budapest
- Hungary
| | - Tamás Földes
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1117 Budapest
- Hungary
| | - Imre Pápai
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- H-1117 Budapest
- Hungary
| | | | - Timo Repo
- Department of Chemistry
- University of Helsinki
- 00014 Helsinki
- Finland
| | - Igor Koptyug
- Laboratory of Magnetic Resonance Microimaging
- International Tomography Center SB RAS
- 630090 Novosibirsk
- Russia
- Department of Natural Sciences
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Claraz A, Sahoo G, Berta D, Madarász Á, Pápai I, Pihko PM. A Catalyst Designed for the Enantioselective Construction of Methyl- and Alkyl-Substituted Tertiary Stereocenters. Angew Chem Int Ed Engl 2015; 55:669-73. [DOI: 10.1002/anie.201509302] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/07/2015] [Indexed: 12/26/2022]
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Claraz A, Sahoo G, Berta D, Madarász Á, Pápai I, Pihko PM. A Catalyst Designed for the Enantioselective Construction of Methyl- and Alkyl-Substituted Tertiary Stereocenters. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201509302] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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