1
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Choo MY, Khaw LWT, Chai CLL. Syntheses of Minutuminolate and Related Coumarin Natural Products and Evaluation of Their TNF-α Inhibitory Activities. ACS OMEGA 2023; 8:41785-41791. [PMID: 37970054 PMCID: PMC10633832 DOI: 10.1021/acsomega.3c06361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/26/2023] [Accepted: 10/09/2023] [Indexed: 11/17/2023]
Abstract
The concise syntheses of the coumarin natural product, minutuminolate (1), and its related natural products, 7-methoxy-8-(2-acetoxy-3-methyl-1-oxobut-2-enyl) coumarin (2) and muralatin I (3), were accomplished for the first time in 4-5 steps from the commercially available umbelliferone. The key step involves a palladium-catalyzed oxidative rearrangement reaction to assemble the α-acyloxyenone moiety in 1 and 2. The incorporation of this functionality enables the successful synthesis of coumarin 3 through an acidic hydrolysis reaction. The anti-inflammatory activities of the compounds were also evaluated against tumor necrosis factor-alpha production in lipopolysaccharides-stimulated RAW264.7 cells. Our developed synthetic route will facilitate the development of analogues and derivatives of 1-3 with potent anti-inflammatory activities.
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Affiliation(s)
- Malcolm
Zheng Yuan Choo
- Department of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore, 117543, Singapore
| | - Lachelle Wei Ting Khaw
- Department of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore, 117543, Singapore
| | - Christina Li Lin Chai
- Department of Pharmacy, National University of Singapore, 18 Science Drive 4, Singapore, 117543, Singapore
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2
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Gierse M, Nagel L, Keim M, Lucas S, Speidel T, Lobmeyer T, Winter G, Josten F, Karaali S, Fellermann M, Scheuer J, Müller C, van Heijster F, Skinner J, Löffler J, Parker A, Handwerker J, Marshall A, Salhov A, El-Kassem B, Vassiliou C, Blanchard JW, Picazo-Frutos R, Eills J, Barth H, Jelezko F, Rasche V, Schilling F, Schwartz I, Knecht S. Parahydrogen-Polarized Fumarate for Preclinical in Vivo Metabolic Magnetic Resonance Imaging. J Am Chem Soc 2023; 145:5960-5969. [PMID: 36857421 DOI: 10.1021/jacs.2c13830] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/03/2023]
Abstract
We present a versatile method for the preparation of hyperpolarized [1-13C]fumarate as a contrast agent for preclinical in vivo MRI, using parahydrogen-induced polarization (PHIP). To benchmark this process, we compared a prototype PHIP polarizer to a state-of-the-art dissolution dynamic nuclear polarization (d-DNP) system. We found comparable polarization, volume, and concentration levels of the prepared solutions, while the preparation effort is significantly lower for the PHIP process, which can provide a preclinical dose every 10 min, opposed to around 90 min for d-DNP systems. With our approach, a 100 mM [1-13C]-fumarate solution of volumes up to 3 mL with 13-20% 13C-hyperpolarization after purification can be produced. The purified solution has a physiological pH, while the catalyst, the reaction side products, and the precursor material concentrations are reduced to nontoxic levels, as confirmed in a panel of cytotoxicity studies. The in vivo usage of the hyperpolarized fumarate as a perfusion agent in healthy mice and the metabolic conversion of fumarate to malate in tumor-bearing mice developing regions with necrotic cell death is demonstrated. Furthermore, we present a one-step synthesis to produce the 13C-labeled precursor for the hydrogenation reaction with high yield, starting from 13CO2 as a cost-effective source for 13C-labeled compounds.
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Affiliation(s)
- Martin Gierse
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany.,Institute for Quantum Optics (IQO) and Center for Integrated Quantum Science and Technology (IQST), Ulm University, 89081 Ulm, Germany
| | - Luca Nagel
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich, Germany
| | - Michael Keim
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany
| | | | - Tobias Speidel
- Core Facility Small Animal MRI, Medical Faculty, Ulm University, 89081 Ulm, Germany
| | - Tobias Lobmeyer
- Core Facility Small Animal MRI, Medical Faculty, Ulm University, 89081 Ulm, Germany
| | - Gordon Winter
- Department of Nuclear Medicine, Ulm University, 89081 Ulm, Germany
| | - Felix Josten
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany
| | - Senay Karaali
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany
| | - Maximilian Fellermann
- Institute of Experimental and Clinical Pharmacology, Toxicology and Pharmacology of Natural Products, University of Ulm Medical Center, 89081 Ulm, Germany
| | | | | | - Frits van Heijster
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich, Germany
| | - Jason Skinner
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich, Germany
| | - Jessica Löffler
- Department of Nuclear Medicine, Ulm University, 89081 Ulm, Germany
| | - Anna Parker
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany
| | | | - Alastair Marshall
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany.,Institute for Quantum Optics (IQO) and Center for Integrated Quantum Science and Technology (IQST), Ulm University, 89081 Ulm, Germany
| | - Alon Salhov
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany.,Racah Institute of Physics, The Hebrew University of Jerusalem, Jerusalem, 91904, Givat Ram, Israel
| | | | | | | | - Román Picazo-Frutos
- Helmholtz-Institut Mainz, GSI Helmholtzzentrum für Schwerionenforschung, Mainz 55128, Germany.,Johannes Gutenberg-Universität Mainz, Mainz 55128, Germany
| | - James Eills
- Institute for Bioengineering of Catalonia, 08028 Barcelona, Spain
| | - Holger Barth
- Institute of Experimental and Clinical Pharmacology, Toxicology and Pharmacology of Natural Products, University of Ulm Medical Center, 89081 Ulm, Germany
| | - Fedor Jelezko
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany.,Institute for Quantum Optics (IQO) and Center for Integrated Quantum Science and Technology (IQST), Ulm University, 89081 Ulm, Germany
| | - Volker Rasche
- Core Facility Small Animal MRI, Medical Faculty, Ulm University, 89081 Ulm, Germany
| | - Franz Schilling
- Department of Nuclear Medicine, TUM School of Medicine, Klinikum Rechts der Isar, Technical University of Munich, 81675 Munich, Germany
| | - Ilai Schwartz
- NVision Imaging Technologies GmbH, 89081 Ulm, Germany
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3
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Bolliger R, Siebenmann L, Wolf E, Ross M, Meola G, Blacque O, Braband H, Alberto R. Exploring Rhenium Arene Piano-Stool Chemistry with [Re(η 6-C 6H 6)(NCCH 3) 3] +: A Powerful Semi-Solvated Precursor. Inorg Chem 2023; 62:4227-4237. [PMID: 36853095 PMCID: PMC10015454 DOI: 10.1021/acs.inorgchem.2c04346] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
Thermal treatment of the ReIII hydride complex [ReH(η5-C6H7)(η6-C6H6)]+ in CH3CN results in the formation of [Re(η6-C6H6)(NCCH3)3]+. This semi-solvated complex is remarkably stable under an ambient atmosphere and exhibits a fast CH3CN self-exchange, which facilitates substitution reactions. The CH3CN ligands are replaced by σ-donating phosphines such as trimethyl phosphine (PMe3), triphenyl phosphine (PPh3), or the bidentate 1,2-bis(diphenylphosphino)ethane (dppe) to afford [Re(η6-C6H6)(NCCH3)3-x(PR3)x]+ (if R = Me, then x = 2; if R = Ph, then x = 1 or 2) or [Re(η6-C6H6)(dppe)(NCCH3)]+, respectively. [Re(η6-C6H6)(NCCH3)3]+ also reacts with π-acceptors such as 2,2'-bipyridine (bipy), 1,10-phenanthroline (phen), or CO (1 atm) to give [Re(η6-C6H6)(L)(NCCH3)]+ (L = bipy or phen) and [Re(η6-C6H6)(CO)(NCCH3)2]+, respectively. The latter does not show any signs of decomposition after being exposed to an ambient atmosphere for multiple days. Additionally, [Re(η6-C6H6)(NCCH3)3]+ reacts with π-donors such as the dienes 2,3-dimethyl-1,3-butadiene (DMBD), norbornadiene (NBD), or 1,5-cyclooctadiene (COD) to give [Re(η6-C6H6)(η4-diene)(NCCH3)]+ (diene = DMBD, NBD, and COD). All three complexes are extremely stable and do not decompose during purification by preparative high-performance liquid chromatography (aqueous acidic gradient). In the presence of 18-crown-6, [Re(η6-C6H6)(NCCH3)3]+ reacts with lithium cyclopentadienyl to give the sandwich complex [Re(η5-C5H5)(η6-C6H6)]. Loss of the coordinated benzene was observed when treating [Re(η6-C6H6)(NCCH3)3]+ with diphenylacetylene (PhC≡CPh), yielding the tetra-coordinated [Re(NCCH3)(η2-PhC≡CPh)3]+.
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Affiliation(s)
- Robin Bolliger
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Lukas Siebenmann
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Emily Wolf
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Megan Ross
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Giuseppe Meola
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Olivier Blacque
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Henrik Braband
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
| | - Roger Alberto
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, 8057 Zürich, Switzerland
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4
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Fürstner A. How to Break the Law:
trans
‐Hydroboration and
gem
‐Hydroboration of Alkynes. Isr J Chem 2023. [DOI: 10.1002/ijch.202300004] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/11/2023]
Affiliation(s)
- Alois Fürstner
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
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5
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Chromium-catalyzed stereodivergent E- and Z-selective alkyne hydrogenation controlled by cyclic (alkyl)(amino)carbene ligands. Nat Commun 2023; 14:990. [PMID: 36813784 PMCID: PMC9947122 DOI: 10.1038/s41467-023-36677-9] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2022] [Accepted: 02/13/2023] [Indexed: 02/24/2023] Open
Abstract
The hydrogenation of alkynes allows the synthesis of olefins, which are important feedstock for the materials, pharmaceutical, and petrochemical industry. Thus, methods that enable this transformation via low-cost metal catalysis are desirable. However, achieving stereochemical control in this reaction is a long-standing challenge. Here, we report on the chromium-catalyzed E- and Z-selective olefin synthesis via hydrogenation of alkynes, controlled by two carbene ligands. A cyclic (alkyl)(amino)carbene ligand that contains a phosphino anchor enables the hydrogenation of alkynes in a trans-addition manner, selectively forming E-olefins. With an imino anchor-incorporated carbene ligand, the stereoselectivity can be switched, giving mainly Z-isomers. This ligand-enabled geometrical stereoinversion strategy by one metal catalysis overrides common methods in control of the E- and Z-selectivity with two different metal catalysis, allowing for highly efficient and on-demand access to both E- and Z-olefins in a stereo-complementary fashion. Mechanistic studies indicate that the different steric effect between these two carbene ligands may mainly dominate the selective forming E- or Z-olefins in control of the stereochemistry.
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6
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Eills J, Budker D, Cavagnero S, Chekmenev EY, Elliott SJ, Jannin S, Lesage A, Matysik J, Meersmann T, Prisner T, Reimer JA, Yang H, Koptyug IV. Spin Hyperpolarization in Modern Magnetic Resonance. Chem Rev 2023; 123:1417-1551. [PMID: 36701528 PMCID: PMC9951229 DOI: 10.1021/acs.chemrev.2c00534] [Citation(s) in RCA: 55] [Impact Index Per Article: 55.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
Magnetic resonance techniques are successfully utilized in a broad range of scientific disciplines and in various practical applications, with medical magnetic resonance imaging being the most widely known example. Currently, both fundamental and applied magnetic resonance are enjoying a major boost owing to the rapidly developing field of spin hyperpolarization. Hyperpolarization techniques are able to enhance signal intensities in magnetic resonance by several orders of magnitude, and thus to largely overcome its major disadvantage of relatively low sensitivity. This provides new impetus for existing applications of magnetic resonance and opens the gates to exciting new possibilities. In this review, we provide a unified picture of the many methods and techniques that fall under the umbrella term "hyperpolarization" but are currently seldom perceived as integral parts of the same field. Specifically, before delving into the individual techniques, we provide a detailed analysis of the underlying principles of spin hyperpolarization. We attempt to uncover and classify the origins of hyperpolarization, to establish its sources and the specific mechanisms that enable the flow of polarization from a source to the target spins. We then give a more detailed analysis of individual hyperpolarization techniques: the mechanisms by which they work, fundamental and technical requirements, characteristic applications, unresolved issues, and possible future directions. We are seeing a continuous growth of activity in the field of spin hyperpolarization, and we expect the field to flourish as new and improved hyperpolarization techniques are implemented. Some key areas for development are in prolonging polarization lifetimes, making hyperpolarization techniques more generally applicable to chemical/biological systems, reducing the technical and equipment requirements, and creating more efficient excitation and detection schemes. We hope this review will facilitate the sharing of knowledge between subfields within the broad topic of hyperpolarization, to help overcome existing challenges in magnetic resonance and enable novel applications.
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Affiliation(s)
- James Eills
- Institute
for Bioengineering of Catalonia, Barcelona
Institute of Science and Technology, 08028Barcelona, Spain,
| | - Dmitry Budker
- Johannes
Gutenberg-Universität Mainz, 55128Mainz, Germany,Helmholtz-Institut,
GSI Helmholtzzentrum für Schwerionenforschung, 55128Mainz, Germany,Department
of Physics, UC Berkeley, Berkeley, California94720, United States
| | - Silvia Cavagnero
- Department
of Chemistry, University of Wisconsin, Madison, Madison, Wisconsin53706, United States
| | - Eduard Y. Chekmenev
- Department
of Chemistry, Integrative Biosciences (IBio), Karmanos Cancer Institute
(KCI), Wayne State University, Detroit, Michigan48202, United States,Russian
Academy of Sciences, Moscow119991, Russia
| | - Stuart J. Elliott
- Molecular
Sciences Research Hub, Imperial College
London, LondonW12 0BZ, United Kingdom
| | - Sami Jannin
- Centre
de RMN à Hauts Champs de Lyon, Université
de Lyon, CNRS, ENS Lyon, Université Lyon 1, 69100Villeurbanne, France
| | - Anne Lesage
- Centre
de RMN à Hauts Champs de Lyon, Université
de Lyon, CNRS, ENS Lyon, Université Lyon 1, 69100Villeurbanne, France
| | - Jörg Matysik
- Institut
für Analytische Chemie, Universität
Leipzig, Linnéstr. 3, 04103Leipzig, Germany
| | - Thomas Meersmann
- Sir
Peter Mansfield Imaging Centre, University Park, School of Medicine, University of Nottingham, NottinghamNG7 2RD, United Kingdom
| | - Thomas Prisner
- Institute
of Physical and Theoretical Chemistry and Center of Biomolecular Magnetic
Resonance, Goethe University Frankfurt, , 60438Frankfurt
am Main, Germany
| | - Jeffrey A. Reimer
- Department
of Chemical and Biomolecular Engineering, UC Berkeley, and Materials Science Division, Lawrence Berkeley National
Laboratory, Berkeley, California94720, United States
| | - Hanming Yang
- Department
of Chemistry, University of Wisconsin, Madison, Madison, Wisconsin53706, United States
| | - Igor V. Koptyug
- International Tomography Center, Siberian
Branch of the Russian Academy
of Sciences, 630090Novosibirsk, Russia,
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7
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Synthesis of substituted furan-3-carboxylates from alkyl 3-bromo-3-nitroacrylates. MENDELEEV COMMUNICATIONS 2023. [DOI: 10.1016/j.mencom.2023.01.003] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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8
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Jing W, Shen H, Qin R, Wu Q, Liu K, Zheng N. Surface and Interface Coordination Chemistry Learned from Model Heterogeneous Metal Nanocatalysts: From Atomically Dispersed Catalysts to Atomically Precise Clusters. Chem Rev 2022; 123:5948-6002. [PMID: 36574336 DOI: 10.1021/acs.chemrev.2c00569] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
The surface and interface coordination structures of heterogeneous metal catalysts are crucial to their catalytic performance. However, the complicated surface and interface structures of heterogeneous catalysts make it challenging to identify the molecular-level structure of their active sites and thus precisely control their performance. To address this challenge, atomically dispersed metal catalysts (ADMCs) and ligand-protected atomically precise metal clusters (APMCs) have been emerging as two important classes of model heterogeneous catalysts in recent years, helping to build bridge between homogeneous and heterogeneous catalysis. This review illustrates how the surface and interface coordination chemistry of these two types of model catalysts determines the catalytic performance from multiple dimensions. The section of ADMCs starts with the local coordination structure of metal sites at the metal-support interface, and then focuses on the effects of coordinating atoms, including their basicity and hardness/softness. Studies are also summarized to discuss the cooperativity achieved by dual metal sites and remote effects. In the section of APMCs, the roles of surface ligands and supports in determining the catalytic activity, selectivity, and stability of APMCs are illustrated. Finally, some personal perspectives on the further development of surface coordination and interface chemistry for model heterogeneous metal catalysts are presented.
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Affiliation(s)
- Wentong Jing
- State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and National & Local Joint Engineering Research Center for Preparation Technology of Nanomaterials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Hui Shen
- State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and National & Local Joint Engineering Research Center for Preparation Technology of Nanomaterials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Ruixuan Qin
- State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and National & Local Joint Engineering Research Center for Preparation Technology of Nanomaterials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Qingyuan Wu
- State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and National & Local Joint Engineering Research Center for Preparation Technology of Nanomaterials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
- Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen 361102, China
| | - Kunlong Liu
- State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and National & Local Joint Engineering Research Center for Preparation Technology of Nanomaterials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Nanfeng Zheng
- State Key Laboratory for Physical Chemistry of Solid Surfaces, Collaborative Innovation Center of Chemistry for Energy Materials, and National & Local Joint Engineering Research Center for Preparation Technology of Nanomaterials, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
- Innovation Laboratory for Sciences and Technologies of Energy Materials of Fujian Province (IKKEM), Xiamen 361102, China
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9
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Bai W, Tsang LY, Wang Y, Li Y, Sung HHY, Williams ID, Jia G. Synthesis and characterization of bi(metallacycloprop-1-ene) complexes. Chem Sci 2022; 14:96-102. [PMID: 36605739 PMCID: PMC9769101 DOI: 10.1039/d2sc05378k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/27/2022] [Accepted: 11/15/2022] [Indexed: 11/18/2022] Open
Abstract
In all previously reported metallacycloprop-1-ene or η2-vinyl complexes, the metal center bears only one vinyl moiety. We have now successfully synthesized and structurally characterized the first complexes bearing two η2-vinyl moieties or spiro bi(metallacycloprop-1-ene) complexes from reactions of alkynes with rhenium phosphine complexes. Computational studies indicate that the metallacycloprop-1-ene rings are aromatic and the complexes represent a rare σ-type spirometalla-aromatic system.
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Affiliation(s)
- Wei Bai
- Department of Chemistry, The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP. R. China,State Key Laboratory of Fine Chemicals, Department of Chemistry, School of Chemical Engineering, Dalian University of TechnologyLiaoning 116024P. R. China
| | - Long Yiu Tsang
- Department of Chemistry, The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP. R. China
| | - Yilun Wang
- State Key Laboratory of Fine Chemicals, Department of Chemistry, School of Chemical Engineering, Dalian University of TechnologyLiaoning 116024P. R. China,School of Chemical Engineering, Dalian University of TechnologyPanjinLiaoning 124221P. R. China
| | - Yang Li
- State Key Laboratory of Fine Chemicals, Department of Chemistry, School of Chemical Engineering, Dalian University of TechnologyLiaoning 116024P. R. China,School of Chemical Engineering, Dalian University of TechnologyPanjinLiaoning 124221P. R. China
| | - Herman H. Y. Sung
- Department of Chemistry, The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP. R. China
| | - Ian D. Williams
- Department of Chemistry, The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP. R. China
| | - Guochen Jia
- Department of Chemistry, The Hong Kong University of Science and TechnologyClear Water BayKowloonHong KongP. R. China
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10
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van Beek CB, Killian L, Lutz M, Weingarth M, Asundi AS, Sarangi R, Klein Gebbink RJM, Broere DLJ. E-selective Semi-hydrogenation of Alkynes under Mild Conditions by a Diruthenium Hydride Complex. Chemistry 2022; 28:e202202527. [PMID: 35979748 PMCID: PMC10092327 DOI: 10.1002/chem.202202527] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2022] [Indexed: 12/14/2022]
Abstract
The synthesis, characterization and catalytic activity of a new class of diruthenium hydrido carbonyl complexes bound to the tBu PNNP expanded pincer ligand is described. Reacting tBu PNNP with two equiv of RuHCl(PPh3 )3 (CO) at 140 °C produces an insoluble air-stable complex, which was structurally characterized as [Ru2 (tBu PNNP)H(μ-H)Cl(μ-Cl)(CO)2 ] (1) using solid-state NMR, IR and X-ray absorption spectroscopies and follow-up reactivity. A reaction with KOtBu results in deprotonation of a methylene linker to produce [Ru2 (tBu PNNP* )H(μ-H)(μ-OtBu)(CO)2 ] (3) featuring a partially dearomatized naphthyridine core. This enables metal-ligand cooperative activation of H2 analogous to the mononuclear analogue, [Ru(tBu PNP*)H(CO)]. In contrast to the mononuclear system, the bimetallic analogue 3 catalyzes the E-selective semi-hydrogenation of alkynes at ambient temperature and atmospheric H2 pressure with good functional group tolerance. Monitoring the semi-hydrogenation of diphenylacetylene by 1 H NMR spectroscopy shows the intermediacy of Z-stilbene, which is subsequently isomerized to the E-isomer. Initial findings into the mode of action of this system are provided, including the spectroscopic characterization of a polyhydride intermediate and the isolation of a deactivated species with a partially hydrogenated naphthyridine backbone.
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Affiliation(s)
- Cody B van Beek
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht (The, Netherlands
| | - Lars Killian
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht (The, Netherlands
| | - Martin Lutz
- Structural Biochemistry, Bijvoet Centre for Biomolecular Research, Faculty of Science, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht (The, Netherlands
| | - Markus Weingarth
- NMR Spectroscopy, Bijvoet Centre for Biomolecular Research, Department of Chemistry, Faculty of Science, Utrecht University, Padualaan 8, 3584 CH, Utrecht (The, Netherlands
| | - Arun S Asundi
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, 94025, Menlo Park, California, USA
| | - Ritimukta Sarangi
- Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, Stanford University, 94025, Menlo Park, California, USA
| | - Robertus J M Klein Gebbink
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht (The, Netherlands
| | - Daniël L J Broere
- Organic Chemistry and Catalysis, Debye Institute for Nanomaterials Science, Faculty of Science, Utrecht University, Universiteitsweg 99, 3584 CG, Utrecht (The, Netherlands
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11
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Gong X, Bai M, Lu G, Yang B, Lei T, Jiang S. Total synthesis of murraol, (E)-Suberenol and toward the collective total synthesis of exotines A, cnidimonins A-Cetc. Tetrahedron 2022. [DOI: 10.1016/j.tet.2022.133061] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/31/2022]
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12
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Synthesis of polysubstituted furan-3(4)-carboxylates (microreview). Chem Heterocycl Compd (N Y) 2022. [DOI: 10.1007/s10593-022-03103-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/10/2022]
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13
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Abhyankar PC, MacMillan SN, Lacy DC. Bench-Stable Dinuclear Mn(I) Catalysts in E-Selective Alkyne Semihydrogenation: A Mechanistic Investigation. Chemistry 2022; 28:e202201766. [PMID: 35695788 PMCID: PMC9509449 DOI: 10.1002/chem.202201766] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Indexed: 11/12/2022]
Abstract
Dinuclear manganese hydride complexes of the form [Mn2 (CO)8 (μ-H)(μ-PR2 )] (R=Ph, 1; R=iPr, 2) were used in E-selective alkyne semi-hydrogenation (E-SASH) catalysis. Catalyst speciation studies revealed rich coordination chemistry and the complexes thus formed were isolated and in turn tested as catalysts; the results underscore the importance of dinuclearity in engendering the observed E-selectivity and provide insights into the nature of the active catalyst. The insertion product obtained from treating 2 with (cyclopropylethynyl)benzene contains a cis-alkenyl bridging ligand with the cyclopropyl ring being intact. Treatment of this complex with H2 affords exclusively trans-(2-cyclopropylvinyl)benzene. These results, in addition to other control experiments, indicate a non-radical mechanism for E-SASH, which is highly unusual for Mn-H catalysts. The catalytically active species are virtually inactive towards cis to trans alkene isomerization indicating that the E-selective process is intrinsic and dinuclear complexes play a critical role. A reaction mechanism is proposed accounting for the observed reactivity which is fully consistent with a kinetic analysis of the rate limiting step and is further supported by DFT computations.
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Affiliation(s)
- Preshit C Abhyankar
- Department of Chemistry, University at Buffalo State University of New York, Buffalo, New York, 14260, USA
| | - Samantha N MacMillan
- Department of Chemistry and Chemical Biology, Cornell University, Ithaca, New York, 14853, USA
| | - David C Lacy
- Department of Chemistry, University at Buffalo State University of New York, Buffalo, New York, 14260, USA
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14
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Synthesis and characterization of multinuclear ruthenium clusters assembled by terminal alkyne alcohols and ortho-carborane diselenolate ligands. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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15
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Tan YX, Li S, Song L, Zhang X, Wu YD, Sun J. Ruthenium-Catalyzed Geminal Hydroborative Cyclization of Enynes. Angew Chem Int Ed Engl 2022; 61:e202204319. [PMID: 35596681 DOI: 10.1002/anie.202204319] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2022] [Indexed: 12/25/2022]
Abstract
Disclosed here is the first geminal (gem-) hydroborative cyclization of enynes. Different from known hydroborative cyclizations, this process adds hydrogen and boron to the same position, leading to a new reaction mode. With [Cp*RuCl]4 as catalyst, a range of gem-hydroborated bicyclic products bearing a cyclopropane unit could be rapidly assembled from simple enyne substrates. Control experiments and density functional theory (DFT) calculations provided important insights into the reaction mechanism. Notably, two major competing pathways may operate with substrate-dependence. 1,6-Enynes favor initial oxidative cyclometalation to form a ruthenacyclopentene intermediate prior to engaging hydroborane, while other enynes (e.g., 1,7-enynes) that lack strong propensity toward cyclization prefer initial alkyne gem-(H,B)-addition to form an α-boryl ruthenium carbene followed by intramolecular olefin cyclopropanation. This process also represents the first ruthenium-catalyzed enyne hydroborative cyclization.
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Affiliation(s)
- Yun-Xuan Tan
- Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration & Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
| | - Shijia Li
- Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration & Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China.,Shenzhen Bay Laboratory, Shenzhen, 518055, China
| | - Lijuan Song
- School of Science, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, China
| | - Xinhao Zhang
- Shenzhen Bay Laboratory, Shenzhen, 518055, China.,Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen, 518055, China
| | - Yun-Dong Wu
- Shenzhen Bay Laboratory, Shenzhen, 518055, China.,Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen, 518055, China
| | - Jianwei Sun
- Department of Chemistry and the Hong Kong Branch of Chinese National Engineering Research Centre for Tissue Restoration & Reconstruction, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong SAR, China
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16
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Radkowski K, Fürstner A. A Sphingolipid Fatty Acid Constituent Made by Alkyne trans‐Hydrogenation: Total Synthesis of Symbioramide. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200540] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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17
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Biberger T, Nöthling N, Leutzsch M, Gordon CP, Copéret C, Fürstner A. An Anionic Dinuclear Ruthenium Dihydrogen Complex of Relevance for Alkyne
gem
‐Hydrogenation. Angew Chem Int Ed Engl 2022; 61:e202201311. [PMID: 35363926 PMCID: PMC9322539 DOI: 10.1002/anie.202201311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Indexed: 11/12/2022]
Abstract
During an investigation into the fate of ruthenium precatalysts used for light‐driven alkyne gem‐hydrogenation reactions with formation of Grubbs‐type ruthenium catalysts, it was found that the reaction of [(IPr)(η6‐cymene)RuCl2] with H2 under UV‐irradiation affords an anionic dinuclear σ‐dihydrogen complex, which is thermally surprisingly robust. Not only are anionic σ‐complexes in general exceedingly rare, but the newly formed species seems to be the first example lacking any structural attributes able to counterbalance the negative charge and, in so doing, prevent oxidative insertion of the metal centers into the ligated H2 from occurring.
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Affiliation(s)
- Tobias Biberger
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
| | - Nils Nöthling
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
| | - Markus Leutzsch
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
| | - Christopher P. Gordon
- Department of Chemistry and Applied Biosciences, ETH Zürich Vladimir-Prelog-Weg 1–5 8093 Zürich Switzerland
| | - Christophe Copéret
- Department of Chemistry and Applied Biosciences, ETH Zürich Vladimir-Prelog-Weg 1–5 8093 Zürich Switzerland
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
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18
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Tan YX, Li S, Song L, Zhang X, Wu YD, Sun J. Ruthenium‐Catalyzed Geminal Hydroborative Cyclization of Enynes. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202204319] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yun-Xuan Tan
- Hong Kong University of Science and Technology School of Science Department of Chemistry HONG KONG
| | - Shijia Li
- Hong Kong University of Science and Technology School of Science Department of Chemistry HONG KONG
| | - Lijuan Song
- Harbin Institute of Technology Shenzhen School of Science CHINA
| | - Xinhao Zhang
- Peking University Shenzhen Graduate School Lab of Computational Chemistry and Drug Design CHINA
| | - Yun-Dong Wu
- Peking University Shenzhen Graduate School Lab of Computational Chemistry and Drug Design CHINA
| | - Jianwei Sun
- Hong Kong University of Science and Technology Department of Chemistry Clear Water Bay Hong Kong HONG KONG
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19
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Bajo S, Theulier CA, Campos J. Mechanistic Investigations on Hydrogenation, Isomerization and Hydrosilylation Reactions Mediated by a Germyl‐Rhodium System. ChemCatChem 2022; 14:e202200157. [PMID: 36032040 PMCID: PMC9401076 DOI: 10.1002/cctc.202200157] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2022] [Revised: 05/09/2022] [Indexed: 11/07/2022]
Affiliation(s)
- Sonia Bajo
- CSIC: Consejo Superior de Investigaciones Cientificas IIQ SPAIN
| | | | - Jesus Campos
- Consejo Superior de Investigaciones Cientificas Institute of Chemical Research Av. Americo Vespucio 49, Isla de la 41092 Sevilla SPAIN
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20
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Tickner BJ, Zhivonitko VV. Advancing homogeneous catalysis for parahydrogen-derived hyperpolarisation and its NMR applications. Chem Sci 2022; 13:4670-4696. [PMID: 35655870 PMCID: PMC9067625 DOI: 10.1039/d2sc00737a] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2022] [Accepted: 03/21/2022] [Indexed: 12/18/2022] Open
Abstract
Parahydrogen-induced polarisation (PHIP) is a nuclear spin hyperpolarisation technique employed to enhance NMR signals for a wide range of molecules. This is achieved by exploiting the chemical reactions of parahydrogen (para-H2), the spin-0 isomer of H2. These reactions break the molecular symmetry of para-H2 in a way that can produce dramatically enhanced NMR signals for reaction products, and are usually catalysed by a transition metal complex. In this review, we discuss recent advances in novel homogeneous catalysts that can produce hyperpolarised products upon reaction with para-H2. We also discuss hyperpolarisation attained in reversible reactions (termed signal amplification by reversible exchange, SABRE) and focus on catalyst developments in recent years that have allowed hyperpolarisation of a wider range of target molecules. In particular, recent examples of novel ruthenium catalysts for trans and geminal hydrogenation, metal-free catalysts, iridium sulfoxide-containing SABRE systems, and cobalt complexes for PHIP and SABRE are reviewed. Advances in this catalysis have expanded the types of molecules amenable to hyperpolarisation using PHIP and SABRE, and their applications in NMR reaction monitoring, mechanistic elucidation, biomedical imaging, and many other areas, are increasing.
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Affiliation(s)
- Ben J Tickner
- NMR Research Unit, Faculty of Science, University of Oulu P.O. Box 3000 Oulu 90014 Finland
- Department of Chemical and Biological Physics, Faculty of Chemistry, Weizmann Institute of Science Rehovot 7610001 Israel
| | - Vladimir V Zhivonitko
- NMR Research Unit, Faculty of Science, University of Oulu P.O. Box 3000 Oulu 90014 Finland
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21
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Caló FP, Zimmer A, Bistoni G, Fürstner A. From Serendipity to Rational Design: Heteroleptic Dirhodium Amidate Complexes for Diastereodivergent Asymmetric Cyclopropanation. J Am Chem Soc 2022; 144:7465-7478. [PMID: 35420801 PMCID: PMC9052758 DOI: 10.1021/jacs.2c02258] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
![]()
A heteroleptic dirhodium
paddlewheel complex comprising three chiral
carboxylate ligands and one achiral acetamidate ligand has recently
been found to be uniquely effective in catalyzing the asymmetric cyclopropanation
of olefins with α-stannylated (silylated and germylated) α-diazoacetate
derivatives. A number of control experiments in combination with detailed
computational studies provide compelling evidence that an interligand
hydrogen bond between the −NH group of the amidate and the
ester carbonyl group of the reactive rhodium carbene intermediate
plays a quintessential role in the stereodetermining transition state.
The penalty for distorting this array outweighs steric arguments and
renders two of the four conceivable transitions states unviable. Based
on this mechanistic insight, the design of the parent catalyst is
revisited herein: placement of appropriate peripheral substituents
allows high levels of diastereocontrol to be imposed upon cyclopropanation,
which the original catalyst lacks. Because the new complexes allow
either trans- or cis-configured stannylated cyclopropanes to be made
selectively and in excellent optical purity, this transformation also
marks a rare case of diastereodivergent asymmetric catalysis. The
products are amenable to stereospecific cross coupling with aryl halides
or alkenyl triflates; these transformations appear to be the first
examples of the formation of stereogenic quaternary carbon centers
by the Stille reaction; carbonylative coupling is also achieved. Moreover,
tin/lithium exchange affords chiral lithium enolates, which can be
intercepted with a variety of electrophilic partners. The virtues
and inherent flexibility of this new methodology are illustrated by
an efficient synthesis of two salinilactones, extremely scarce bacterial
metabolites with signaling function involved in the self-regulatory
growth inhibition of the producing strain.
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Affiliation(s)
| | - Anne Zimmer
- Max-Planck-Institut für Kohlenforschung, Mülheim/Ruhr D-45470, Germany
| | - Giovanni Bistoni
- Max-Planck-Institut für Kohlenforschung, Mülheim/Ruhr D-45470, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, Mülheim/Ruhr D-45470, Germany
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22
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Biberger T, Nöthling N, Leutzsch M, Gordon CP, Copéret C, Fürstner A. An Anionic Dinuclear Ruthenium Dihydrogen Complex of Relevance for Alkyne gem‐Hydrogenation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202201311] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Tobias Biberger
- Max-Planck-Institut für Kohlenforschung: Max-Planck-Institut fur Kohlenforschung Organometallc Chemistry 45470 Mülheim/Ruhr GERMANY
| | - Nils Nöthling
- Max-Planck-Institut für Kohlenforschung: Max-Planck-Institut fur Kohlenforschung Chemical Crystallography 45470 Mülheim/Ruhr GERMANY
| | - Markus Leutzsch
- Max-Planck-Institut für Kohlenforschung: Max-Planck-Institut fur Kohlenforschung NMR Spectroscopy 45470 Mülheim/Ruhr GERMANY
| | - Christopher P. Gordon
- ETH Zürich: Eidgenossische Technische Hochschule Zurich Inorganic Chemistry 8093 Zürich SWITZERLAND
| | - Christophe Copéret
- ETH Zürich: Eidgenossische Technische Hochschule Zurich Inorganic Chemistry 8093 Zürich SWITZERLAND
| | - Alois Fürstner
- Max-Planck-Institut fur Kohlenforschung Organometallic Chemistry Kaiser-Wilhelm-Platz 1 45470 Mülheim/Ruhr GERMANY
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23
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Yang M, Yu Y, Ma W, Feng Y, Zhang G, Wu Y, Zhou F, Yang Y, Liu D. Palladium-catalyzed hydroboration reaction of unactivated alkynes with bis (pinacolato) diboron in water. RSC Adv 2022; 12:9815-9820. [PMID: 35424934 PMCID: PMC8961796 DOI: 10.1039/d1ra09136k] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2021] [Accepted: 03/14/2022] [Indexed: 11/21/2022] Open
Abstract
A highly efficient and mild palladium-catalyzed hydroboration of unactivated internal alkynes in water is described. Both aryl- and alkyl-substituted alkynes proceeded smoothly within the reaction time to afford the desired vinylboronates in moderate to high yields. Bis (pinacolato) diboron was used to afford α- and β-hydroborated products in the presence of HOAc. These reactions showed high reactivities and tolerance, thus providing a promising method for the synthesis of alkenyl boron compounds.
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Affiliation(s)
- Ming Yang
- School of Chemistry and Engineering, Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing, Wuhan Textile University 1 Textile Road Wuhan 430073 Hubei China
| | - Yunzi Yu
- School of Chemistry and Engineering, Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing, Wuhan Textile University 1 Textile Road Wuhan 430073 Hubei China
| | - Wenxia Ma
- School of Chemistry and Engineering, Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing, Wuhan Textile University 1 Textile Road Wuhan 430073 Hubei China
| | - Yuqin Feng
- School of Chemistry and Engineering, Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing, Wuhan Textile University 1 Textile Road Wuhan 430073 Hubei China
| | - Gang Zhang
- School of Chemistry and Engineering, Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing, Wuhan Textile University 1 Textile Road Wuhan 430073 Hubei China
| | - Yaqi Wu
- School of Chemistry and Engineering, Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing, Wuhan Textile University 1 Textile Road Wuhan 430073 Hubei China
| | - Fanyu Zhou
- School of Chemistry and Engineering, Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing, Wuhan Textile University 1 Textile Road Wuhan 430073 Hubei China
| | - Yongsheng Yang
- School of Chemistry and Engineering, Hubei Key Laboratory of Biomass Fibers and Eco-dyeing & Finishing, Wuhan Textile University 1 Textile Road Wuhan 430073 Hubei China
| | - Dezheng Liu
- School of Mechanical Engineering, Hubei University of Arts and Science No. 296 Longzhong Road Xiangyang Hubei Province 41053 P. R. China
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24
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Shen J, Usui R, Sunada Y. An Iridium Complex with a Phosphine‐Pendant Silyl Ligand as an Efficient Catalyst for the (E)‐Selective Semi‐Hydrogenation of Alkynes. European J Org Chem 2022. [DOI: 10.1002/ejoc.202101563] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Jingfeng Shen
- The University of Tokyo - Komaba Campus: Tokyo Daigaku - Komaba Campus Department of Applied Chemistry 4-6-1 Komaba, Meguro-ku 1538505 Tokyo JAPAN
| | - Ryosuke Usui
- The University of Tokyo - Komaba Campus: Tokyo Daigaku - Komaba Campus Department of Applied Chemistry 4-6-1 Komaba, Meguro-ku 1538505 Tokyo JAPAN
| | - Yusuke Sunada
- The University of Tokyo Institute of Industrial Science 4-6-1, Komaba 153-8505 Meguro-ku JAPAN
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25
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Peil S, Gutiérrez González A, Leutzsch M, Fürstner A. C-H Insertion via Ruthenium Catalyzed gem-Hydrogenation of 1,3-Enynes. J Am Chem Soc 2022; 144:4158-4167. [PMID: 35170941 PMCID: PMC8915261 DOI: 10.1021/jacs.1c13446] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
![]()
gem-Hydrogenation of an internal alkyne with the
aid of [Cp*RuCl]4 as the precatalyst is a highly unorthodox
transformation, in which one C atom of the triple bond is transformed
into a methylene group, whereas the second C atom gets converted into
a ruthenium carbene. In the case of 1,3-enynes bearing a propargylic
steering substituent as the substrates, the reaction occurs regioselectively,
giving rise to vinyl carbene complexes that adopt interconverting
η1/η3-binding modes in solution;
a prototypical example of such a reactive intermediate was characterized
in detail by spectroscopic means. Although both forms are similarly
stable, only the η3-vinyl carbene proved kinetically
competent to insert into primary, secondary, or tertiary C–H
bonds on the steering group itself or another suitably placed ether,
acetal, orthoester, or (sulfon)amide substituent. The ensuing net
hydrogenative C–H insertion reaction is highly enabling in
that it gives ready access to spirocyclic as well as bridged ring
systems of immediate relevance as building blocks for medicinal chemistry.
Moreover, the reaction scales well and lends itself to the formation
of partly or fully deuterated isotopologues. Labeling experiments
in combination with PHIP NMR spectroscopy (PHIP = parahydrogen induced
polarization) confirmed that the reactions are indeed triggered by gem-hydrogenation, whereas kinetic data provided valuable
insights into the very nature of the turnover-limiting transition
state of the actual C–H insertion step.
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Affiliation(s)
- Sebastian Peil
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | | | - Markus Leutzsch
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
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26
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Biberger T, Hess SN, Leutzsch M, Fürstner A. Hydrogenative Cycloisomerization and Sigmatropic Rearrangement Reactions of Cationic Ruthenium Carbenes Formed by Catalytic Alkyne
gem
‐Hydrogenation. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202113827] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Tobias Biberger
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
| | - Stephan N. Hess
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
| | - Markus Leutzsch
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
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27
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Petruncio G, Shellnutt Z, Elahi-Mohassel S, Alishetty S, Paige M. Skipped dienes in natural product synthesis. Nat Prod Rep 2021; 38:2187-2213. [PMID: 34913051 DOI: 10.1039/d1np00012h] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Covering: 2000-2020The 1,4-diene motif, also known as a skipped diene, is widespread across various classes of natural products including alkaloids, fatty acids, terpenoids, and polyketides as part of either the finalized structure or a biosynthetic intermediate. The prevalence of this nonconjugated diene system in nature has resulted in numerous encounters in the total synthesis literature. However, skipped dienes have not been extensively reviewed, which could be attributed to overshadowing by the more recognized 1,3-diene system. In this review, we aim to highlight the relevance of skipped dienes in natural products through the lens of total synthesis. Subjects that will be covered include nomenclature, structural properties, prevalence in natural products, synthetic strategies and the future direction of the field.
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Affiliation(s)
- Greg Petruncio
- Department of Chemistry & Biochemistry, George Mason University, 10920 George Mason Circle, Manassas, Virginia 20110, USA.
| | - Zachary Shellnutt
- Department of Chemistry & Biochemistry, George Mason University, 10920 George Mason Circle, Manassas, Virginia 20110, USA.
| | - Synah Elahi-Mohassel
- Department of Chemistry & Biochemistry, George Mason University, 10920 George Mason Circle, Manassas, Virginia 20110, USA.
| | - Suman Alishetty
- Department of Bioengineering, George Mason University, 10920 George Mason Circle, Manassas, Virginia 20110, USA
| | - Mikell Paige
- Department of Chemistry & Biochemistry, George Mason University, 10920 George Mason Circle, Manassas, Virginia 20110, USA.
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28
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Biberger T, Hess SN, Leutzsch M, Fürstner A. Hydrogenative Cycloisomerization and Sigmatropic Rearrangement Reactions of Cationic Ruthenium Carbenes Formed by Catalytic Alkyne gem-Hydrogenation. Angew Chem Int Ed Engl 2021; 61:e202113827. [PMID: 34911159 PMCID: PMC9306539 DOI: 10.1002/anie.202113827] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2021] [Indexed: 11/10/2022]
Abstract
gem‐Hydrogenation of propargyl alcohol derivatives with [CpXRu(MeCN)3]PF6 (CpX=substituted cyclopentadienyl) as catalysts affords cationic pianostool ruthenium carbene complexes which are so electrophilic that they attack a tethered olefin to furnish cyclopentene products; cyclopropanation or metathesis do not compete with this novel transformation. If the transient carbenes carry appropriate propargylic substituents, however, they engage in ([2,3]‐sigmatropic) rearrangements to give enol esters (carbonates, carbamates, sulfonates) or alkenyl halides. Both pathways are unprecedented in the vast hydrogenation literature. The proposed mechanistic scenarios are in line with labeling experiments and spectroscopic data; most notably, PHIP NMR spectroscopy (PHIP=parahydrogen induced polarization) provides compelling evidence that the reactions are indeed triggered by highly unorthodox gem‐hydrogenation events.
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Affiliation(s)
- Tobias Biberger
- Max-Planck-Institut für Kohlenforschung: Max-Planck-Institut fur Kohlenforschung, Organometallic Chemistry, GERMANY
| | - Stephan N Hess
- Max-Planck-Institut für Kohlenforschung: Max-Planck-Institut fur Kohlenforschung, Organometallic Chemistry, GERMANY
| | - Markus Leutzsch
- Max-Planck-Institut für Kohlenforschung: Max-Planck-Institut fur Kohlenforschung, NMR Spectroscopy, GERMANY
| | - Alois Fürstner
- Max-Planck-Institut fur Kohlenforschung, Organometallic Chemistry, Kaiser-Wilhelm-Platz 1, 45470, Mülheim/Ruhr, GERMANY
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29
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Hale DJ, Ferguson MJ, Turculet L. (PSiP)Ni-Catalyzed (E)-Selective Semihydrogenation of Alkynes with Molecular Hydrogen. ACS Catal 2021. [DOI: 10.1021/acscatal.1c04537] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Dylan J. Hale
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, P.O. Box 15000, Halifax B3H 4R2, Nova Scotia, Canada
| | - Michael J. Ferguson
- X-Ray Crystallography Laboratory, Department of Chemistry, University of Alberta, Edmonton T6G 2G2, Alberta, Canada
| | - Laura Turculet
- Department of Chemistry, Dalhousie University, 6274 Coburg Road, P.O. Box 15000, Halifax B3H 4R2, Nova Scotia, Canada
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30
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Catalyzed stereo-selective hydrogenation of ynamides to give enamines: Ethanol as a hydrogen donor. J Organomet Chem 2021. [DOI: 10.1016/j.jorganchem.2021.122024] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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31
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Song T, Li Q, Ma Z, Yang Y. Recent advance in selective hydrogenation reaction catalyzed by biomass-derived non-noble metal nanocomposites. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153331] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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32
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Melot R, Saiegh TJ, Fürstner A. Regioselective trans-Hydrostannation of Boron-Capped Alkynes. Chemistry 2021; 27:17002-17011. [PMID: 34240757 PMCID: PMC9291331 DOI: 10.1002/chem.202101901] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Indexed: 01/16/2023]
Abstract
Alkynyl‐B(aam) (aam=anthranilamidato) derivatives are readily available bench‐stable compounds that undergo remarkably selective reactions with Bu3SnH in the presence of [Cp*RuCl]4 as the catalyst. The addition follows a stereochemically unorthodox trans‐selective course; in terms of regioselectivity, the Bu3Sn‐ unit is delivered with high fidelity to the C‐atom of the triple bond adjacent to the boracyclic head group (“alpha,trans‐addition”). This outcome is deemed to reflect a hydrogen bonding interaction between the protic −NH groups of the benzo‐1,3,2‐diazaborininone ring system and the polarized [Ru−Cl] bond in the loaded catalyst, which locks the substrate in place in a favorable orientation relative to the incoming reagent. The resulting isomerically (almost) pure gem‐dimetalated building blocks are amenable to numerous downstream functionalizations; most remarkable is the ability to subject the −B(aam) moiety to Suzuki‐Miyaura cross coupling without need for prior hydrolysis while keeping the adjacent Bu3Sn‐ group intact. Alternatively, the tin residue can be engaged in selective tin/halogen exchange without touching the boron substituent; the fact that the two ‐NH entities of −B(aam) do not protonate organozinc reagents and hence do not interfere with Negishi reactions of the alkenyl halides thus formed is another virtue of this so far underutilized boracycle. Overall, the ruthenium catalyzed trans‐hydrostannation of alkynyl‐B(aam) derivatives opens a practical gateway to isomerically pure trisubstituted alkenes of many different substitution patterns by sequential functionalization of the 1‐alkenyl‐1,1‐heterobimetallic adducts primarily formed.
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Affiliation(s)
- Romain Melot
- Max-Planck-Institut für Kohlenforschung, 45470, Mülheim an der RuhrMülheim/Ruhr, Germany
| | - Tomas J Saiegh
- Max-Planck-Institut für Kohlenforschung, 45470, Mülheim an der RuhrMülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470, Mülheim an der RuhrMülheim/Ruhr, Germany
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33
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Fathi Vavsari V. Ruthenium Catalysts in Regioselective Hydrogenative Metathesis. SYNOPEN 2021. [DOI: 10.1055/s-0040-1706043] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022] Open
Abstract
Abstract
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34
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Löffler LE, Buchsteiner M, Collins LR, Caló FP, Singha S, Fürstner A. [Rh
2
(MEPY)
4
] and [BiRh(MEPY)
4
]: Convenient Syntheses and Computational Analysis of Strikingly Dissimilar Siblings. Helv Chim Acta 2021. [DOI: 10.1002/hlca.202100042] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Affiliation(s)
- Lorenz E. Löffler
- Max-Planck-Institut für Kohlenforschung DE-45470 Mülheim/Ruhr Germany
| | | | - Lee R. Collins
- Max-Planck-Institut für Kohlenforschung DE-45470 Mülheim/Ruhr Germany
| | - Fabio P. Caló
- Max-Planck-Institut für Kohlenforschung DE-45470 Mülheim/Ruhr Germany
| | - Santanu Singha
- Max-Planck-Institut für Kohlenforschung DE-45470 Mülheim/Ruhr Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung DE-45470 Mülheim/Ruhr Germany
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35
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Zachmann RJ, Fürstner A. Light-Driven gem Hydrogenation: An Orthogonal Entry into "Second-Generation" Ruthenium Carbene Catalysts for Olefin Metathesis. Chemistry 2021; 27:7663-7666. [PMID: 33871083 PMCID: PMC8251631 DOI: 10.1002/chem.202101176] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2021] [Indexed: 01/11/2023]
Abstract
The newly discovered light-driven gem hydrogenation of alkynes opens an unconventional yet efficient entry into five-coordinate Grubbs-type ruthenium carbene complexes with cis-disposed chloride ligands. Representatives of this class featuring a chelate substructure formed by an iodo-substituted benzylidene unit react with (substituted) 2-isopropoxystyrene to give prototypical "second-generation" Grubbs-Hoveyda complexes for olefin metathesis. The new approach to this venerable catalyst family is safe and versatile as it uses a triple bond rather than phenyldiazomethane as the ultimate carbene source and does not require any sacrificial phosphines.
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Affiliation(s)
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470, Mülheim/Ruhr, Germany
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36
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Lu Q, Gu J, Liu F, Li C. Computational Study on Mechanisms and Origins of Selectivities in Rh(I)-Catalyzed Cycloisomerizations of 1,6-Allenynes with Tethered Unsaturated Carbon–Carbon Bonds. ACS Catal 2021. [DOI: 10.1021/acscatal.0c05386] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Qianqian Lu
- College of Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Jun Gu
- College of Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Fang Liu
- College of Sciences, Nanjing Agricultural University, Nanjing, Jiangsu 210095, China
| | - Chunsen Li
- State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China
- Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry, Xiamen, Fujian 361005, China
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37
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Reineri F, Cavallari E, Carrera C, Aime S. Hydrogenative-PHIP polarized metabolites for biological studies. MAGMA (NEW YORK, N.Y.) 2021; 34:25-47. [PMID: 33527252 PMCID: PMC7910253 DOI: 10.1007/s10334-020-00904-x] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/07/2020] [Revised: 12/09/2020] [Accepted: 12/18/2020] [Indexed: 12/14/2022]
Abstract
ParaHydrogen induced polarization (PHIP) is an efficient and cost-effective hyperpolarization method, but its application to biological investigations has been hampered, so far, due to chemical challenges. PHIP is obtained by means of the addition of hydrogen, enriched in the para-spin isomer, to an unsaturated substrate. Both hydrogen atoms must be transferred to the same substrate, in a pairwise manner, by a suitable hydrogenation catalyst; therefore, a de-hydrogenated precursor of the target molecule is necessary. This has strongly limited the number of parahydrogen polarized substrates. The non-hydrogenative approach brilliantly circumvents this central issue, but has not been translated to in-vivo yet. Recent advancements in hydrogenative PHIP (h-PHIP) considerably widened the possibility to hyperpolarize metabolites and, in this review, we will focus on substrates that have been obtained by means of this method and used in vivo. Attention will also be paid to the requirements that must be met and on the issues that have still to be tackled to obtain further improvements and to push PHIP substrates in biological applications.
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Affiliation(s)
- Francesca Reineri
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, Turin, Italy.
| | - Eleonora Cavallari
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, Turin, Italy
| | - Carla Carrera
- Institute of Biostructures and Bioimaging, National Research Council, Via Nizza 52, Turin, Italy
| | - Silvio Aime
- Department of Molecular Biotechnology and Health Sciences, University of Torino, Via Nizza 52, Turin, Italy
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38
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Pounder A, Chen LD, Tam W. Ruthenium-Catalyzed [2 + 2] versus Homo Diels-Alder [2 + 2 + 2] Cycloadditions of Norbornadiene and Disubstituted Alkynes: A DFT Study. ACS OMEGA 2021; 6:900-911. [PMID: 33458541 PMCID: PMC7808161 DOI: 10.1021/acsomega.0c05499] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/10/2020] [Accepted: 12/07/2020] [Indexed: 06/12/2023]
Abstract
The ruthenium-catalyzed [2 + 2] and homo Diels-Alder [2 + 2 + 2] cycloadditions of norbornadiene with disubstituted alkynes are investigated using density functional theory (DFT). These DFT calculations provide a mechanistic explanation for observed reactivity trends with different functional groups. Alkynyl phosphonates and norbornadiene form the [2 + 2 + 2] cycloadduct, while other functionalized alkynes afford the respective [2 + 2] cycloadduct, in excellent agreement with experimental results. The computational studies on the potential energy profiles of the cycloadditions show that the rate-determining step for the [2 + 2] cycloaddition is the final reductive elimination step, but the overall rate for the [2 + 2 + 2] cycloaddition is controlled by the initial oxidative cyclization. Two distinct mechanistic pathways for the [2 + 2 + 2] cycloaddition, cationic and neutral, are characterized and reveal that Cp*RuCl(COD) energetically prefers the cationic pathway.
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39
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Besora M, Maseras F. Computational insights into metal-catalyzed asymmetric hydrogenation. ADVANCES IN CATALYSIS 2021. [DOI: 10.1016/bs.acat.2021.08.006] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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40
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Barsu N, Leutzsch M, Fürstner A. Ruthenium-Catalyzed trans-Hydroalkynylation and trans-Chloroalkynylation of Internal Alkynes. J Am Chem Soc 2020; 142:18746-18752. [PMID: 33095568 PMCID: PMC7660751 DOI: 10.1021/jacs.0c08582] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
![]()
[Cp*RuCl]4 catalyzes the
addition of iPr3SiC≡CX (X = H,
Cl) across internal alkynes with
formation of 1,3-enyne or 1-chloro-1,3-enyne derivatives, respectively;
the reaction follows an unorthodox trans-addition
mode. The well-balanced affinities of the different reaction partners
to the ruthenium catalyst ensure that crossed addition prevails over
homodimerization of the individual components, as can be deduced from
spectroscopic and crystallographic data of various intermediates;
this includes a dinuclear complex in which an internal alkyne bridges
two [Cp*RuCl] fragments.
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Affiliation(s)
- Nagaraju Barsu
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | - Markus Leutzsch
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
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41
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Peil S, Bistoni G, Goddard R, Fürstner A. Hydrogenative Metathesis of Enynes via Piano-Stool Ruthenium Carbene Complexes Formed by Alkyne gem-Hydrogenation. J Am Chem Soc 2020; 142:18541-18553. [PMID: 33073575 PMCID: PMC7596760 DOI: 10.1021/jacs.0c07808] [Citation(s) in RCA: 26] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
![]()
The
only recently discovered gem-hydrogenation
of internal alkynes is a fundamentally new transformation, in which
both H atoms of dihydrogen are transferred to the same C atom of a
triple bond while the other position transforms into a discrete metal
carbene complex. [Cp*RuCl]4 is presently the catalyst of
choice: the resulting piano-stool ruthenium carbenes can engage a
tethered alkene into either cyclopropanation or metathesis, and a
prototypical example of such a reactive intermediate with an olefin
ligated to the ruthenium center has been isolated and characterized
by X-ray diffraction. It is the substitution pattern of the olefin
that determines whether metathesis or cyclopropanation takes place:
a systematic survey using alkenes of largely different character in
combination with a computational study of the mechanism at the local
coupled cluster level of theory allowed the preparative results to
be sorted and an intuitive model with predictive power to be proposed.
This model links the course of the reaction to the polarization of
the double bond as well as to the stability of the secondary carbene
complex formed, if metathesis were to take place. The first application
of “hydrogenative metathesis” to the total synthesis
of sinularones E and F concurred with this interpretation and allowed
the proposed structure of these marine natural products to be confirmed.
During this synthesis, it was found that gem-hydrogenation
also provides opportunities for C–H functionalization. Moreover,
silylated alkynes are shown to participate well in hydrogenative metathesis,
which opens a new entry into valuable allylsilane building blocks.
Crystallographic evidence suggests that the polarized [Ru–Cl]
bond of the catalyst interacts with the neighboring R3Si
group. Since attractive interligand Cl/R3Si contacts had
already previously been invoked to explain the outcome of various
ruthenium-catalyzed reactions, including trans-hydrosilylation,
the experimental confirmation provided herein has implications beyond
the present case.
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Affiliation(s)
- Sebastian Peil
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | - Giovanni Bistoni
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | - Richard Goddard
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470 Mülheim/Ruhr, Germany
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42
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Biberger T, Zachmann RJ, Fürstner A. Grubbs Metathesis Enabled by a Light-Driven gem-Hydrogenation of Internal Alkynes. Angew Chem Int Ed Engl 2020; 59:18423-18429. [PMID: 32608043 PMCID: PMC7589215 DOI: 10.1002/anie.202007030] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Revised: 06/19/2020] [Indexed: 02/02/2023]
Abstract
[(NHC)(cymene)RuCl2 ] (NHC=N-heterocyclic carbene) complexes instigate a light-driven gem-hydrogenation of internal alkynes with concomitant formation of discrete Grubbs-type ruthenium carbene species. This unorthodox reactivity mode is harnessed in the form of a "hydrogenative metathesis" reaction, which converts an enyne substrate into a cyclic alkene. The intervention of ruthenium carbenes formed in the actual gem-hydrogenation step was proven by the isolation and crystallographic characterization of a rather unusual representative of this series carrying an unconfined alkyl group on a disubstituted carbene center.
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Affiliation(s)
- Tobias Biberger
- Max-Planck-Institut für Kohlenforschung45470Mülheim/RuhrGermany
| | | | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung45470Mülheim/RuhrGermany
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43
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Liu S, Pu M, Wu YD, Zhang X. Computational Study on the Fate of Oxidative Directing Groups in Ru(II), Rh(III), and Pd(II) Catalyzed C-H Functionalization. J Org Chem 2020; 85:12594-12602. [PMID: 32931704 DOI: 10.1021/acs.joc.0c01775] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Activation of C-H bonds assisted by a directing group is indispensable in organic synthesis. Among them, utilizing oxidative directing groups that can serve as an internal oxidant to drive the Mn/Mn+2 catalytic cycle has recently become a promising strategy. A survey of published reactions involving N-alkoxyamides or N-acyloxyamides reveals that not all N-O bonds act as an internal oxidant. We have therefore systematically investigated the effect of the oxidative groups on a model reaction catalyzed by Ru(II), Rh(III), and Pd(II) complexes. DFT calculations show that N-methoxy and N-acyloxy groups oxidize Ru(II) to Ru(IV) and Rh(III) to Rh(V), but cannot oxidize a cyclo-Pd(II) intermediate to Pd(IV). The stability of the metal imido intermediate 7-M (M = Ru, Rh, and Pd) controls whether the oxidation occurs or not. N-Acyloxy groups show a more pronounced selectivity than N-methoxy to oxidize Ru(II) and Rh(III) species, while no distinctive effect is observed for Pd(II).
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Affiliation(s)
- Siqi Liu
- College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China
| | - Maoping Pu
- Shenzhen Bay Laboratory, Shenzhen 518132, P. R. China
| | - Yun-Dong Wu
- College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, P. R. China.,Shenzhen Bay Laboratory, Shenzhen 518132, P. R. China.,Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen 518055, P. R. China
| | - Xinhao Zhang
- Shenzhen Bay Laboratory, Shenzhen 518132, P. R. China.,Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen 518055, P. R. China
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44
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Liu J, Wei Z, Yang J, Ge Y, Wei D, Jackstell R, Jiao H, Beller M. Tuning the Selectivity of Palladium Catalysts for Hydroformylation and Semihydrogenation of Alkynes: Experimental and Mechanistic Studies. ACS Catal 2020. [DOI: 10.1021/acscatal.0c03614] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jiawang Liu
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Str. 29a, Rostock 18059, Germany
| | - Zhihong Wei
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Str. 29a, Rostock 18059, Germany
- Institute of Molecular Science, Key Laboratory of Materials for Energy Conversion and Storage of Shanxi Province, Shanxi University, Taiyuan 030006, P. R. China
| | - Ji Yang
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Str. 29a, Rostock 18059, Germany
| | - Yao Ge
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Str. 29a, Rostock 18059, Germany
| | - Duo Wei
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Str. 29a, Rostock 18059, Germany
| | - Ralf Jackstell
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Str. 29a, Rostock 18059, Germany
| | - Haijun Jiao
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Str. 29a, Rostock 18059, Germany
| | - Matthias Beller
- Leibniz-Institut für Katalyse e.V., Albert-Einstein-Str. 29a, Rostock 18059, Germany
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45
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Chen S, Liu L, Gao X, Hua Y, Peng L, Zhang Y, Yang L, Tan Y, He F, Xia H. Addition of alkynes and osmium carbynes towards functionalized d π-p π conjugated systems. Nat Commun 2020; 11:4651. [PMID: 32938934 PMCID: PMC7495419 DOI: 10.1038/s41467-020-18498-2] [Citation(s) in RCA: 27] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2020] [Accepted: 08/21/2020] [Indexed: 12/12/2022] Open
Abstract
The metal-carbon triple bonds and carbon-carbon triple bonds are both highly unsaturated bonds. As a result, their reactions tend to afford cycloaddition intermediates or products. Herein, we report a reaction of M≡C and C≡C bonds that affords acyclic addition products. These newly discovered reactions are highly efficient, regio- and stereospecific, with good functional group tolerance, and are robust under air at room temperature. The isotope labeling NMR experiments and theoretical calculations reveal the reaction mechanism. Employing these reactions, functionalized dπ-pπ conjugated systems can be easily constructed and modified. The resulting dπ-pπ conjugated systems were found to be good electron transport layer materials in organic solar cells, with power conversion efficiency up to 16.28% based on the PM6: Y6 non-fullerene system. This work provides a facile, efficient methodology for the preparation of dπ-pπ conjugated systems for use in functional materials.
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Affiliation(s)
- Shiyan Chen
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, 361005, Xiamen, China
| | - Longzhu Liu
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, 518055, Shenzhen, China
| | - Xiang Gao
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, 361005, Xiamen, China
| | - Yuhui Hua
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, 361005, Xiamen, China
| | - Lixia Peng
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, 361005, Xiamen, China
| | - Ying Zhang
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, 361005, Xiamen, China
| | - Liulin Yang
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, 361005, Xiamen, China
| | - Yuanzhi Tan
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, 361005, Xiamen, China
| | - Feng He
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, 518055, Shenzhen, China.
| | - Haiping Xia
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Collaborative Innovation Center of Chemistry for Energy Materials (iChEM), College of Chemistry and Chemical Engineering, Xiamen University, 361005, Xiamen, China.
- Shenzhen Grubbs Institute and Department of Chemistry, Southern University of Science and Technology, 518055, Shenzhen, China.
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46
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Biberger T, Zachmann RJ, Fürstner A. Grubbs Metathesis Enabled by a Light‐Driven
gem
‐Hydrogenation of Internal Alkynes. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202007030] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Affiliation(s)
- Tobias Biberger
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
| | | | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
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47
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Dagys L, Ripka B, Leutzsch M, Moustafa G, Eills J, Colell J, Levitt M. Geminal parahydrogen-induced polarization: accumulating long-lived singlet order on methylene proton pairs. MAGNETIC RESONANCE (GOTTINGEN, GERMANY) 2020; 1:175-186. [PMID: 37904826 PMCID: PMC10500696 DOI: 10.5194/mr-1-175-2020] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 06/19/2020] [Accepted: 07/27/2020] [Indexed: 11/01/2023]
Abstract
In the majority of hydrogenative parahydrogen-induced polarization (PHIP) experiments, the hydrogen molecule undergoes pairwise cis addition to an unsaturated precursor to occupy vicinal positions on the product molecule. However, some ruthenium-based hydrogenation catalysts induce geminal hydrogenation, leading to a reaction product in which the two hydrogen atoms are transferred to the same carbon centre, forming a methylene (CH 2 ) group. The singlet order of parahydrogen is substantially retained over the geminal hydrogenation reaction, giving rise to a singlet-hyperpolarized CH 2 group. Although the T 1 relaxation times of the methylene protons are often short, the singlet order has a long lifetime, provided that singlet-triplet mixing is suppressed, either by chemical equivalence of the protons or by applying a resonant radiofrequency field. The long lifetime of the singlet order enables the accumulation of hyperpolarization during the slow hydrogenation reaction. We introduce a kinetic model for the behaviour of the observed hyperpolarized signals, including both the chemical kinetics and the spin dynamics of the reacting molecules. Our work demonstrates the feasibility of producing singlet-hyperpolarized methylene moieties by parahydrogen-induced polarization. This potentially extends the range of molecular agents which may be generated in a hyperpolarized state by chemical reactions of parahydrogen.
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Affiliation(s)
- Laurynas Dagys
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK
| | - Barbara Ripka
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK
| | - Markus Leutzsch
- Max-Planck-Institut für Kohlenforschung, Kaiser-Wilhelm-Platz 1, 45470 Mülheim an der Ruhr, Germany
| | | | - James Eills
- Helmholtz Institute Mainz, Johannes Gutenberg University, 55099 Mainz, Germany
| | | | - Malcolm H. Levitt
- School of Chemistry, University of Southampton, Southampton SO17 1BJ, UK
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Jin H, Fürstner A. Modular Synthesis of Furans with up to Four Different Substituents by a trans-Carboboration Strategy. Angew Chem Int Ed Engl 2020; 59:13618-13622. [PMID: 32374441 PMCID: PMC7496670 DOI: 10.1002/anie.202005560] [Citation(s) in RCA: 19] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/16/2020] [Indexed: 01/18/2023]
Abstract
Propargyl alcohols, on treatment with MHMDS (M=Na, K), B2 (pin)2 , an acid chloride and a palladium/copper co-catalyst system, undergo a reaction cascade comprised of trans-diboration, regioselective acylation, cyclization and dehydration to give trisubstituted furylboronic acid pinacol ester derivatives in good yields; subsequent Suzuki coupling allows a fourth substituent of choice to be introduced and hence tetrasubstituted (arylated) furans to be formed. In terms of modularity, the method seems unrivaled, not least because each product can be attained by two orthogonal but convergent ways ("diagonal split"). This asset is illustrated by the "serial" formation of a "library" of all twelve possible furan isomers that result from systematic permutation of four different substituents about the heterocyclic core.
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Affiliation(s)
- Hongming Jin
- Max-Planck-Institut für Kohlenforschung, 45470, Mülheim/Ruhr, Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung, 45470, Mülheim/Ruhr, Germany
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Jin H, Fürstner A. Modular Synthesis of Furans with up to Four Different Substituents by a
trans
‐Carboboration Strategy. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202005560] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Affiliation(s)
- Hongming Jin
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
| | - Alois Fürstner
- Max-Planck-Institut für Kohlenforschung 45470 Mülheim/Ruhr Germany
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Feng Q, Wu H, Li X, Song L, Chung LW, Wu YD, Sun J. Ru-Catalyzed Geminal Hydroboration of Silyl Alkynes via a New gem-Addition Mechanism. J Am Chem Soc 2020; 142:13867-13877. [DOI: 10.1021/jacs.0c05334] [Citation(s) in RCA: 29] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Qiang Feng
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, SAR, China
| | - Haonan Wu
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
- Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
| | - Xin Li
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Lijuan Song
- Shenzhen Bay Laboratory, Shenzhen 518055, China
| | - Lung Wa Chung
- Shenzhen Grubbs Institute, Department of Chemistry and Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
| | - Yun-Dong Wu
- Lab of Computational Chemistry and Drug Design, State Key Laboratory of Chemical Oncogenomics, Peking University Shenzhen Graduate School, Shenzhen 518055, China
- Shenzhen Bay Laboratory, Shenzhen 518055, China
- College of Chemistry, Peking University, Beijing 100871, China
| | - Jianwei Sun
- Department of Chemistry, The Hong Kong University of Science and Technology, Clear Water Bay, Kowloon, Hong Kong, SAR, China
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