1
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Thiourea Organocatalysts as Emerging Chiral Pollutants: En Route to Porphyrin-Based (Chir)Optical Sensing. CHEMOSENSORS 2021. [DOI: 10.3390/chemosensors9100278] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Abstract
Environmental pollution with chiral organic compounds is an emerging problem requiring innovative sensing methods. Amino-functionalized thioureas, such as 2-(dimethylamino)cyclohexyl-(3,5-bis(trifluoromethyl)phenyl)thiourea (Takemoto’s catalyst), are widely used organocatalysts with virtually unknown environmental safety data. Ecotoxicity studies based on the Vibrio fischeri luminescence inhibition test reveal significant toxicity of Takemoto’s catalyst (EC50 = 7.9 mg/L) and its NH2-substituted analog (EC50 = 7.2–7.4 mg/L). The observed toxic effect was pronounced by the influence of the trifluoromethyl moiety. En route to the porphyrin-based chemosensing of Takemoto-type thioureas, their supramolecular binding to a series of zinc porphyrins was studied with UV-Vis and circular dichroism (CD) spectroscopy, computational analysis and single crystal X-ray diffraction. The association constant values generally increased with the increasing electron-withdrawing properties of the porphyrins and electron-donating ability of the thioureas, a result of the predominant Zn⋯N cation–dipole (Lewis acid–base) interaction. The binding event induced a CD signal in the Soret band region of the porphyrin hosts—a crucial property for chirality sensing of Takemoto-type thioureas.
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2
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Lv X, Zheng Y, Pan J, Chen L, Lin K, Ye D, Zhou W. Assignment of NMR data and Conformational analysis of larotrectinib and its precursors. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132064] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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3
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Žabka M, Kocian A, Bilka S, Andrejčák S, Šebesta R. Transformation of Racemic Azlactones into Enantioenriched Dihydropyrroles and Lactones Enabled by Hydrogen-Bond Organocatalysis. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901052] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Matej Žabka
- Department of Organic Chemistry; Faculty of Natural Science; Comenius University in Bratislava; Mlynska dolina, Ilkovičova 6 84215 Bratislava Slovakia
| | - Adrián Kocian
- Department of Organic Chemistry; Faculty of Natural Science; Comenius University in Bratislava; Mlynska dolina, Ilkovičova 6 84215 Bratislava Slovakia
| | - Stanislav Bilka
- Department of Organic Chemistry; Faculty of Natural Science; Comenius University in Bratislava; Mlynska dolina, Ilkovičova 6 84215 Bratislava Slovakia
| | - Samuel Andrejčák
- Department of Organic Chemistry; Faculty of Natural Science; Comenius University in Bratislava; Mlynska dolina, Ilkovičova 6 84215 Bratislava Slovakia
| | - Radovan Šebesta
- Department of Organic Chemistry; Faculty of Natural Science; Comenius University in Bratislava; Mlynska dolina, Ilkovičova 6 84215 Bratislava Slovakia
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4
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Li X, Kong X, Yang S, Meng M, Zhan X, Zeng M, Fang X. Bifunctional Thiourea-Catalyzed Asymmetric Inverse-Electron-Demand Diels–Alder Reaction of Allyl Ketones and Vinyl 1,2-Diketones via Dienolate Intermediate. Org Lett 2019; 21:1979-1983. [DOI: 10.1021/acs.orglett.9b00035] [Citation(s) in RCA: 36] [Impact Index Per Article: 7.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Xinglong Li
- State Key Laboratory of Structural Chemistry, and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
| | - Xiangwen Kong
- State Key Laboratory of Structural Chemistry, and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
| | - Shuang Yang
- State Key Laboratory of Structural Chemistry, and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
| | - Miao Meng
- Department of Chemistry, Jinan University, Guangzhou 510632, China
| | - Xinyue Zhan
- College of Chemistry, Fuzhou University, Fuzhou 350116, China
| | - Min Zeng
- College of Chemistry, Fuzhou University, Fuzhou 350116, China
| | - Xinqiang Fang
- State Key Laboratory of Structural Chemistry, and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
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5
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Blise K, Cvitkovic MW, Gibbs NJ, Roberts SF, Whitaker RM, Hofmeister GE, Kohen D. A Theoretical Mechanistic Study of the Asymmetric Desymmetrization of a Cyclic meso-Anhydride by a Bifunctional Quinine Sulfonamide Organocatalyst. J Org Chem 2017; 82:1347-1355. [DOI: 10.1021/acs.joc.6b02320] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Katie Blise
- Department of Chemistry, Carleton College, Northfield, Minnesota 55057, United States
| | - Milan W. Cvitkovic
- Department of Chemistry, Carleton College, Northfield, Minnesota 55057, United States
| | - Nolly J. Gibbs
- Department of Chemistry, Carleton College, Northfield, Minnesota 55057, United States
| | - Sean F. Roberts
- Department of Chemistry, Carleton College, Northfield, Minnesota 55057, United States
| | - Reid M. Whitaker
- Department of Chemistry, Carleton College, Northfield, Minnesota 55057, United States
| | | | - Daniela Kohen
- Department of Chemistry, Carleton College, Northfield, Minnesota 55057, United States
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6
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Grayson MN, Houk KN. Cinchona Urea-Catalyzed Asymmetric Sulfa-Michael Reactions: The Brønsted Acid−Hydrogen Bonding Model. J Am Chem Soc 2016; 138:9041-4. [DOI: 10.1021/jacs.6b05074] [Citation(s) in RCA: 81] [Impact Index Per Article: 10.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Matthew N. Grayson
- Centre
for Molecular Informatics, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, United Kingdom
| | - K. N. Houk
- Department
of Chemistry and Biochemistry, University of California, Los Angeles, California 90095-1569, United States
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7
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Varga S, Jakab G, Csámpai A, Soós T. Iterative Coupling of Two Different Enones by Nitromethane Using Bifunctional Thiourea Organocatalysts. Stereocontrolled Assembly of Cyclic and Acyclic Structures. J Org Chem 2015; 80:8990-6. [DOI: 10.1021/acs.joc.5b01474] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Szilárd Varga
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, HAS, P.O. Box 286, Budapest, H-1519, Hungary
| | - Gergely Jakab
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, HAS, P.O. Box 286, Budapest, H-1519, Hungary
| | - Antal Csámpai
- Institute
of Chemistry, Department of Inorganic Chemistry, L. Eötvös University, Pázmány Péter sétány 1/A, Budapest H-1117, Hungary
| | - Tibor Soós
- Institute
of Organic Chemistry, Research Centre for Natural Sciences, HAS, P.O. Box 286, Budapest, H-1519, Hungary
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8
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Di Iorio N, Righi P, Ranieri S, Mazzanti A, Margutta RG, Bencivenni G. Vinylogous Reactivity of Oxindoles Bearing Nonsymmetric 3-Alkylidene Groups. J Org Chem 2015; 80:7158-71. [DOI: 10.1021/acs.joc.5b01022] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Affiliation(s)
- Nicola Di Iorio
- Department of Industrial
Chemistry “Toso Montanari”, Alma Mater Studiorum-University of Bologna, Viale del Risorgimento 4, 40136 Bologna, Italy
| | - Paolo Righi
- Department of Industrial
Chemistry “Toso Montanari”, Alma Mater Studiorum-University of Bologna, Viale del Risorgimento 4, 40136 Bologna, Italy
| | - Silvia Ranieri
- Department of Industrial
Chemistry “Toso Montanari”, Alma Mater Studiorum-University of Bologna, Viale del Risorgimento 4, 40136 Bologna, Italy
| | - Andrea Mazzanti
- Department of Industrial
Chemistry “Toso Montanari”, Alma Mater Studiorum-University of Bologna, Viale del Risorgimento 4, 40136 Bologna, Italy
| | - Riccardo G. Margutta
- Department of Industrial
Chemistry “Toso Montanari”, Alma Mater Studiorum-University of Bologna, Viale del Risorgimento 4, 40136 Bologna, Italy
| | - Giorgio Bencivenni
- Department of Industrial
Chemistry “Toso Montanari”, Alma Mater Studiorum-University of Bologna, Viale del Risorgimento 4, 40136 Bologna, Italy
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9
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Varga E, Mika LT, Csámpai A, Holczbauer T, Kardos G, Soós T. Mechanistic investigations of a bifunctional squaramide organocatalyst in asymmetric Michael reaction and observation of stereoselective retro-Michael reaction. RSC Adv 2015. [DOI: 10.1039/c5ra19593d] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022] Open
Abstract
The mechanism of cinchona–squaramide organocatalytic Michael addition was studied usingin situIR and NMR experiments. As a result, not only kinetic parameters were determined but a stereoselective retro-Michael reaction was also observed.
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Affiliation(s)
- Eszter Varga
- Institute of Organic Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- Budapest
- Hungary
| | - László Tamás Mika
- Budapest University of Technology and Economics
- Faculty of Chemical Technology and Biotechnology
- Department of Chemical and Environmental Process Engineering
- Budapest
- Hungary
| | - Antal Csámpai
- Institute of Chemistry
- Eötvös Loránd University
- Budapest
- Hungary
| | - Tamás Holczbauer
- Institute of Organic Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- Budapest
- Hungary
| | - György Kardos
- Institute of Organic Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- Budapest
- Hungary
| | - Tibor Soós
- Institute of Organic Chemistry
- Research Centre for Natural Sciences
- Hungarian Academy of Sciences
- Budapest
- Hungary
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10
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Bae HY, Song CE. Cinchona-based Sulfonamide Organocatalysts: Concept, Scope, and Practical Applications. B KOREAN CHEM SOC 2014. [DOI: 10.5012/bkcs.2014.35.6.1590] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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11
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Kardos G, Soós T. Tether-Free Immobilized Bifunctional Squaramide Organocatalysts for Batch and Flow Reactions. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300626] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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12
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Zhu JL, Zhang Y, Liu C, Zheng AM, Wang W. Insights into the Dual Activation Mechanism Involving Bifunctional Cinchona Alkaloid Thiourea Organocatalysts: An NMR and DFT Study. J Org Chem 2012; 77:9813-25. [DOI: 10.1021/jo302133n] [Citation(s) in RCA: 130] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Jun-Ling Zhu
- State Key Laboratory of Applied
Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, China
| | - Yong Zhang
- State Key Laboratory of Applied
Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, China
| | - Chong Liu
- State Key Laboratory of Applied
Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, China
| | - An-Min Zheng
- State Key Laboratory of Magnetic
Resonance and Atomic and Molecular Physics, Wuhan Center for Magnetic
Resonance, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan, Hubei 430071, China
| | - Wei Wang
- State Key Laboratory of Applied
Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu 730000, China
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13
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Seebach D, Beck AK, Bichsel HU, Pichota A, Sparr C, Wünsch R, Schweizer WB. Preparation and Characterization of New C2- and C1-Symmetric Nitrogen, Oxygen, Phosphorous, and Sulfur Derivatives and Analogs of TADDOL. Part III. Helv Chim Acta 2012. [DOI: 10.1002/hlca.201200148] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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14
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Delbaere S, Berthet J, Shiozawa T, Yokoyama Y. Photochromic C2-Symmetric Chiral Diarylethene: From the Initial State to the Final State. J Org Chem 2012; 77:1853-9. [DOI: 10.1021/jo202466g] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stéphanie Delbaere
- University Lille Nord de France, CNRS UMR 8516, UDSL, Lille, F-59006
Lille Cedex, France
| | - Jérôme Berthet
- University Lille Nord de France, CNRS UMR 8516, UDSL, Lille, F-59006
Lille Cedex, France
| | - Tatsuya Shiozawa
- Department
of Advanced Materials
Chemistry, Yokohama National University, Tokiwadai, Hodogaya, Yokohama 240-8501, Japan
| | - Yasushi Yokoyama
- Department
of Advanced Materials
Chemistry, Yokohama National University, Tokiwadai, Hodogaya, Yokohama 240-8501, Japan
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15
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Tárkányi G, Király P, Soós T, Varga S. Active Conformation in Amine-Thiourea Bifunctional Organocatalysis Preformed by Catalyst Aggregation. Chemistry 2012; 18:1918-22. [DOI: 10.1002/chem.201102701] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/29/2011] [Revised: 12/01/2011] [Indexed: 11/08/2022]
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16
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Oh JS, Lee JW, Ryu TH, Lee JH, Song CE. Self-association free bifunctional thiourea organocatalysts: synthesis of chiral α-amino acids via dynamic kinetic resolution of racemic azlactones. Org Biomol Chem 2012; 10:1052-5. [DOI: 10.1039/c1ob06629c] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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17
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Kumpulainen T, Brouwer AM. Excited-state proton transfer and ion pair formation in a Cinchona organocatalyst. Phys Chem Chem Phys 2012; 14:13019-26. [DOI: 10.1039/c2cp41483j] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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18
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Bae HY, Some S, Lee JH, Kim JY, Song MJ, Lee S, Zhang YJ, Song CE. Organocatalytic Enantioselective Michael-Addition of Malonic Acid Half-Thioesters to β-Nitroolefins: From Mimicry of Polyketide Synthases to Scalable Synthesis of γ-Amino Acids. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201100458] [Citation(s) in RCA: 123] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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19
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Rodriguez-Docampo Z, Connon SJ. Organocatalytic Asymmetric Additions tomeso-Anhydrides and Azlactones. ChemCatChem 2011. [DOI: 10.1002/cctc.201100266] [Citation(s) in RCA: 48] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Varga S, Jakab G, Drahos L, Holczbauer T, Czugler M, Soós T. Double Diastereocontrol in Bifunctional Thiourea Organocatalysis: Iterative Michael–Michael–Henry Sequence Regulated by the Configuration of Chiral Catalysts. Org Lett 2011; 13:5416-9. [DOI: 10.1021/ol201559j] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Szilárd Varga
- Institute of Biomolecular Chemistry, Chemical Research Center of Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary, and Institute of Structural Chemistry, Chemical Research Center of Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary
| | - Gergely Jakab
- Institute of Biomolecular Chemistry, Chemical Research Center of Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary, and Institute of Structural Chemistry, Chemical Research Center of Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary
| | - László Drahos
- Institute of Biomolecular Chemistry, Chemical Research Center of Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary, and Institute of Structural Chemistry, Chemical Research Center of Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary
| | - Tamás Holczbauer
- Institute of Biomolecular Chemistry, Chemical Research Center of Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary, and Institute of Structural Chemistry, Chemical Research Center of Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary
| | - Mátyás Czugler
- Institute of Biomolecular Chemistry, Chemical Research Center of Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary, and Institute of Structural Chemistry, Chemical Research Center of Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary
| | - Tibor Soós
- Institute of Biomolecular Chemistry, Chemical Research Center of Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary, and Institute of Structural Chemistry, Chemical Research Center of Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary
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21
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Lykke L, Rodríguez-Escrich C, Jørgensen KA. Catalytic enantioselective oxaziridination. J Am Chem Soc 2011; 133:14932-5. [PMID: 21875125 DOI: 10.1021/ja2064457] [Citation(s) in RCA: 37] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The first catalytic enantioselective synthesis of oxaziridines is presented. The oxidation of aryl and alkyl aldimines with m-CPBA under organocatalytic conditions using cinchona alkaloid-derived catalysts furnished optically active oxaziridines in good yields and high enantioselectivities (up to 94% ee). Mechanistic investigations indicate a stepwise enantioselective oxidation process.
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Affiliation(s)
- Lennart Lykke
- Center for Catalysis, Department of Chemistry, Aarhus University, Aarhus C, Denmark
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22
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Nishio M. The CH/π hydrogen bond in chemistry. Conformation, supramolecules, optical resolution and interactions involving carbohydrates. Phys Chem Chem Phys 2011; 13:13873-900. [PMID: 21611676 DOI: 10.1039/c1cp20404a] [Citation(s) in RCA: 624] [Impact Index Per Article: 48.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The CH/π hydrogen bond is an attractive molecular force occurring between a soft acid and a soft base. Contribution from the dispersion energy is important in typical cases where aliphatic or aromatic CH groups are involved. Coulombic energy is of minor importance as compared to the other weak hydrogen bonds. The hydrogen bond nature of this force, however, has been confirmed by AIM analyses. The dual characteristic of the CH/π hydrogen bond is the basis for ubiquitous existence of this force in various fields of chemistry. A salient feature is that the CH/π hydrogen bond works cooperatively. Another significant point is that it works in nonpolar as well as polar, protic solvents such as water. The interaction energy depends on the nature of the molecular fragments, CH as well as π-groups: the stronger the proton donating ability of the CH group, the larger the stabilizing effect. This Perspective focuses on the consequence of this molecular force in the conformation of organic compounds and supramolecular chemistry. Implication of the CH/π hydrogen bond extends to the specificity of molecular recognition or selectivity in organic reactions, polymer science, surface phenomena and interactions involving proteins. Many problems, unsettled to date, will become clearer in the light of the CH/π paradigm.
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Affiliation(s)
- Motohiro Nishio
- The CHPI Institute, 705-6-338 Minamioya, Machida-shi, Tokyo, 194-0031, Japan.
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23
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Abstract
After a short introduction to place our work in a proper context, this account summarizes our theoretical and synthetic results in the field of frustrated Lewis pair (FLP) chemistry.
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Affiliation(s)
- Tibor Soós
- 1Chemical Research Center of the Hungarian Academy of Sciences, P.O. Box 17, 1525 Budapest, Hungary
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24
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Park SE, Nam EH, Jang HB, Oh JS, Some S, Lee YS, Song CE. Enantioselective Alcoholysis of meso-Glutaric Anhydrides Catalyzed by Cinchona-Based Sulfonamide Catalysts. Adv Synth Catal 2010. [DOI: 10.1002/adsc.201000289] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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25
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Monge D, Jensen K, Franke P, Lykke L, Jørgensen K. Asymmetric One-Pot Sequential Organo- and Gold Catalysis for the Enantioselective Synthesis of Dihydropyrrole Derivatives. Chemistry 2010; 16:9478-84. [DOI: 10.1002/chem.201001123] [Citation(s) in RCA: 89] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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26
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Jang HB, Rho HS, Oh JS, Nam EH, Park SE, Bae HY, Song CE. DOSY NMR for monitoring self aggregation of bifunctional organocatalysts: increasing enantioselectivity with decreasing catalyst concentration. Org Biomol Chem 2010; 8:3918-22. [DOI: 10.1039/c0ob00047g] [Citation(s) in RCA: 83] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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