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Abstract
Nitroxides, also known as nitroxyl radicals, are long-lived or stable radicals with the general structure R1R2N-O•. The spin distribution over the nitroxide N and O atoms contributes to the thermodynamic stability of these radicals. The presence of bulky N-substituents R1 and R2 prevents nitroxide radical dimerization, ensuring their kinetic stability. Despite their reactivity toward various transient C radicals, some nitroxides can be easily stored under air at room temperature. Furthermore, nitroxides can be oxidized to oxoammonium salts (R1R2N═O+) or reduced to anions (R1R2N-O-), enabling them to act as valuable oxidants or reductants depending on their oxidation state. Therefore, they exhibit interesting reactivity across all three oxidation states. Due to these fascinating properties, nitroxides find extensive applications in diverse fields such as biochemistry, medicinal chemistry, materials science, and organic synthesis. This review focuses on the versatile applications of nitroxides in organic synthesis. For their use in other important fields, we will refer to several review articles. The introductory part provides a brief overview of the history of nitroxide chemistry. Subsequently, the key methods for preparing nitroxides are discussed, followed by an examination of their structural diversity and physical properties. The main portion of this review is dedicated to oxidation reactions, wherein parent nitroxides or their corresponding oxoammonium salts serve as active species. It will be demonstrated that various functional groups (such as alcohols, amines, enolates, and alkanes among others) can be efficiently oxidized. These oxidations can be carried out using nitroxides as catalysts in combination with various stoichiometric terminal oxidants. By reducing nitroxides to their corresponding anions, they become effective reducing reagents with intriguing applications in organic synthesis. Nitroxides possess the ability to selectively react with transient radicals, making them useful for terminating radical cascade reactions by forming alkoxyamines. Depending on their structure, alkoxyamines exhibit weak C-O bonds, allowing for the thermal generation of C radicals through reversible C-O bond cleavage. Such thermally generated C radicals can participate in various radical transformations, as discussed toward the end of this review. Furthermore, the application of this strategy in natural product synthesis will be presented.
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Affiliation(s)
- Dirk Leifert
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149 Münster, Germany
| | - Armido Studer
- Organisch-Chemisches Institut, Westfälische Wilhelms-Universität, Corrensstrasse 40, 48149 Münster, Germany
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2
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Heindl S, Riomet M, Matyasovsky J, Lemmerer M, Malzer N, Maulide N. Chemoselektive γ-Oxidation von β,γ-ungesättigten Amiden mit TEMPO. ANGEWANDTE CHEMIE (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2021; 133:19271-19275. [PMID: 38505148 PMCID: PMC10946935 DOI: 10.1002/ange.202104023] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 06/02/2021] [Indexed: 02/05/2023]
Abstract
AbstractEin chemoselektives und robustes Protokoll zur γ‐Oxidation von β,γ‐ungesättigten Amiden wird dargelegt. Bei dieser Methode ermöglicht elektrophile Amidaktivierung eine bei ungesättigten Amiden bisher selten angewendete regioselektive Reaktion mit TEMPO, die zu γ‐aminoxylierten α,β‐ungesättigten Amiden führt. Radikalische Zyklisierungen und Oxidationen der synthetisierten Produkte untermauern die Nützlichkeit der hergestellten Verbindungen.
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Affiliation(s)
- Sebastian Heindl
- Institut für Organische ChemieUniversität WienWähringer Straße 381090WienÖsterreich
| | - Margaux Riomet
- Institut für Organische ChemieUniversität WienWähringer Straße 381090WienÖsterreich
| | - Ján Matyasovsky
- Institut für Organische ChemieUniversität WienWähringer Straße 381090WienÖsterreich
| | - Miran Lemmerer
- Institut für Organische ChemieUniversität WienWähringer Straße 381090WienÖsterreich
| | - Nicolas Malzer
- Institut für Organische ChemieUniversität WienWähringer Straße 381090WienÖsterreich
| | - Nuno Maulide
- Institut für Organische ChemieUniversität WienWähringer Straße 381090WienÖsterreich
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3
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Heindl S, Riomet M, Matyasovsky J, Lemmerer M, Malzer N, Maulide N. Chemoselective γ-Oxidation of β,γ-Unsaturated Amides with TEMPO. Angew Chem Int Ed Engl 2021; 60:19123-19127. [PMID: 34146371 PMCID: PMC8456850 DOI: 10.1002/anie.202104023] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Revised: 06/02/2021] [Indexed: 12/23/2022]
Abstract
A chemoselective and robust protocol for the γ‐oxidation of β,γ‐unsaturated amides is reported. In this method, electrophilic amide activation, in a rare application to unsaturated amides, enables a regioselective reaction with TEMPO resulting in the title products. Radical cyclisation reactions and oxidation of the synthesised products highlight the synthetic utility of the products obtained.
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Affiliation(s)
- Sebastian Heindl
- Institute of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090, Vienna, Austria
| | - Margaux Riomet
- Institute of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090, Vienna, Austria
| | - Ján Matyasovsky
- Institute of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090, Vienna, Austria
| | - Miran Lemmerer
- Institute of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090, Vienna, Austria
| | - Nicolas Malzer
- Institute of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090, Vienna, Austria
| | - Nuno Maulide
- Institute of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090, Vienna, Austria
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4
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Yazaki R. Development of Catalytic Reactions for Precise Control of Chemoselectivity. Chem Pharm Bull (Tokyo) 2021; 69:516-525. [PMID: 34078797 DOI: 10.1248/cpb.c21-00092] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Catalytic chemoselective reactions of innately less reactive functionalities over more reactive functionalities are described. A cooperative catalyst comprising a soft Lewis acid/hard Brønsted base enabled chemoselective activation of a hydroxyl group over an amino group, allowing for nucleophilic addition to electron-deficient olefins. The reaction could be applicable for a variety of amino alcohols, including pharmaceuticals, without requiring a tedious protection-deprotection process. Chemoselective enolization and subsequent α-functionalization of carboxylic acid derivatives were also achieved by a redox active catalyst through the radical process, providing unnatural α-amino/hydroxy acid derivatives bearing a complex carbon framework and a diverse set of functionalities. The present chemoselective catalysis described herein offers new opportunities to expand the chemical space for innovative drug discovery research.
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Affiliation(s)
- Ryo Yazaki
- Graduate School of Pharmaceutical Sciences, Kyushu University
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5
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Abstract
A method has been developed for the α-tertiary alkylation of zirconium enolates of N-(arylacetyl)oxazolidinones. This reaction directly installs an all-carbon quaternary center vicinal to a benzylic tertiary carbon in a highly diastereoselective manner.
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Affiliation(s)
- Eunjae Shim
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106-9510, USA
| | - Armen Zakarian
- Department of Chemistry and Biochemistry, University of California, Santa Barbara, CA 93106-9510, USA
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6
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Beejapur HA, Zhang Q, Hu K, Zhu L, Wang J, Ye Z. TEMPO in Chemical Transformations: From Homogeneous to Heterogeneous. ACS Catal 2019. [DOI: 10.1021/acscatal.8b05001] [Citation(s) in RCA: 88] [Impact Index Per Article: 17.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Hazi Ahmad Beejapur
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang Province Key Laboratory of Biofuel, Biodiesel Laboratory of China Petroleum and Chemical Industry Federation, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Qi Zhang
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang Province Key Laboratory of Biofuel, Biodiesel Laboratory of China Petroleum and Chemical Industry Federation, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Kecheng Hu
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang Province Key Laboratory of Biofuel, Biodiesel Laboratory of China Petroleum and Chemical Industry Federation, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Li Zhu
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang Province Key Laboratory of Biofuel, Biodiesel Laboratory of China Petroleum and Chemical Industry Federation, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Jianli Wang
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology, Zhejiang Province Key Laboratory of Biofuel, Biodiesel Laboratory of China Petroleum and Chemical Industry Federation, College of Chemical Engineering, Zhejiang University of Technology, Hangzhou 310014, P. R. China
| | - Zhibin Ye
- Department of Chemical and Materials Engineering, Concordia University, Montreal, Quebec H3G 1M8, Canada
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7
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Ohshima T, Yazaki R, Taninokuchi S. Mechanistic Insight into Catalytic Aerobic Chemoselective α-Oxidation of Acylpyrazoles. HETEROCYCLES 2019. [DOI: 10.3987/com-18-s(f)58] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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8
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Davies SG, Fletcher AM, Roberts PM, Thomson JE. SuperQuat chiral auxiliaries: design, synthesis, and utility. Org Biomol Chem 2019; 17:1322-1335. [DOI: 10.1039/c8ob02819b] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
The design, synthesis and outline of some of the most common synthetic applications of the SuperQuat (4-substituted 5,5-dimethyloxazolidine-2-one) family of chiral auxiliaries, developed to address the shortcomings of the Evans (4-substituted oxazolidin-2-one) family of chiral auxiliaries, are presented.
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Affiliation(s)
- Stephen G. Davies
- Department of Chemistry
- Chemistry Research Laboratory
- University of Oxford
- Oxford
- UK
| | - Ai M. Fletcher
- Department of Chemistry
- Chemistry Research Laboratory
- University of Oxford
- Oxford
- UK
| | - Paul M. Roberts
- Department of Chemistry
- Chemistry Research Laboratory
- University of Oxford
- Oxford
- UK
| | - James E. Thomson
- Department of Chemistry
- Chemistry Research Laboratory
- University of Oxford
- Oxford
- UK
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9
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Hidasová D, Janák M, Jahn E, Císařová I, Jones PG, Jahn U. Diastereoselective Radical Couplings Enable the Asymmetric Synthesis of anti
-β-Amino-α-hydroxy Carboxylic Acid Derivatives. European J Org Chem 2018. [DOI: 10.1002/ejoc.201801139] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Denisa Hidasová
- Institute of Organic Chemistry and Biochemistry; Academy of Sciences of the Czech Republic; Flemingovo nam. 2 166 10 Prague 6 Czech Republic
| | - Martin Janák
- Institute of Organic Chemistry and Biochemistry; Academy of Sciences of the Czech Republic; Flemingovo nam. 2 166 10 Prague 6 Czech Republic
| | - Emanuela Jahn
- Institute of Organic Chemistry and Biochemistry; Academy of Sciences of the Czech Republic; Flemingovo nam. 2 166 10 Prague 6 Czech Republic
| | - Ivana Císařová
- Department of Inorganic Chemistry; Faculty of Science; Charles University; Hlavova 2030/8 128 43 Prague 2 Czech Republic
| | - Peter G. Jones
- Fachbereich Chemie; Technische Universität Braunschweig; Hagenring 30 38106 Braunschweig Germany
| | - Ullrich Jahn
- Institute of Organic Chemistry and Biochemistry; Academy of Sciences of the Czech Republic; Flemingovo nam. 2 166 10 Prague 6 Czech Republic
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10
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Ma PJ, Liu H, Xu YJ, Aisa HA, Lu CD. Diastereoselective α-Hydroxylation of N-tert-Butanesulfinyl Imidates and N'-tert-Butanesulfinyl Amidines with Molecular Oxygen. Org Lett 2018; 20:1236-1239. [PMID: 29405721 DOI: 10.1021/acs.orglett.8b00178] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Diastereoselective α-hydroxylation using molecular oxygen has been achieved with chiral α-alkyl N-tert-butanesulfinyl imidates and α-aryl N'-tert-butanesulfinyl amidines. The aza-enolates generated from deprotonation of imidates/amidines can be intercepted by O2 with excellent diastereocontrol and subsequently transformed into α-hydroxylation products in the presence of the reductant trimethyl phosphite.
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Affiliation(s)
- Peng-Ju Ma
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China.,University of Chinese Academy of Sciences , Beijing 100049, China
| | - Hui Liu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Yan-Jun Xu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Haji Akber Aisa
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
| | - Chong-Dao Lu
- Key Laboratory of Plant Resources and Chemistry of Arid Zones, Xinjiang Technical Institute of Physics & Chemistry, Chinese Academy of Sciences , Urumqi 830011, China
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11
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Pinto A, Kaiser D, Maryasin B, Di Mauro G, González L, Maulide N. Hydrative Aminoxylation of Ynamides: One Reaction, Two Mechanisms. Chemistry 2018; 24:2515-2519. [PMID: 29293283 PMCID: PMC5838720 DOI: 10.1002/chem.201706063] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Indexed: 11/08/2022]
Abstract
Organic synthesis boasts a wide array of reactions involving either radical species or ionic intermediates. The combination of radical and polar species, however, has not been explored to a comparable extent. Herein we present the hydrative aminoxylation of ynamides, a reaction which can proceed by either a polar-radical crossover mechanism or through a rare cationic activation. Common to both processes is the versatility of the persistent radical TEMPO and its oxidised oxoammonium derivative TEMPO+ . The unique mechanisms of these processes are elucidated experimentally and by in-depth DFT-calculations.
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Affiliation(s)
- Alexandre Pinto
- Institute of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090, Vienna, Austria
| | - Daniel Kaiser
- Institute of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090, Vienna, Austria
| | - Boris Maryasin
- Institute of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090, Vienna, Austria.,Institute of Theoretical Chemistry, University of Vienna, Währinger Strasse 17, 1090, Vienna, Austria
| | - Giovanni Di Mauro
- Institute of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090, Vienna, Austria
| | - Leticia González
- Institute of Theoretical Chemistry, University of Vienna, Währinger Strasse 17, 1090, Vienna, Austria
| | - Nuno Maulide
- Institute of Organic Chemistry, University of Vienna, Währinger Strasse 38, 1090, Vienna, Austria
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12
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Kennington SCD, Gómez-Palomino A, Salomó E, Romea P, Urpí F, Font-Bardia M. General and stereoselective aminoxylation of biradical titanium(iv) enolates with TEMPO: a detailed study on the effect of the chiral auxiliary. Org Biomol Chem 2018; 16:4807-4815. [PMID: 29915837 DOI: 10.1039/c8ob01074a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A comprehensive analysis of the influence of the chiral auxiliary on the α-aminoxylation of titanium(iv) enolates with TEMPO indicated that (S) 4-tert-butyl-1-oxazolidine-2-thione is the most appropriate scaffold to provide a single diastereomer in high yields for a variety of substrates, which converts such a radical reaction into a highly chemo- and stereoselective oxidation.
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Affiliation(s)
- Stuart C D Kennington
- Departament de Química Inorgànica i Orgànica, Secció de Química Orgànica, and Institut de Biomedicina (IBUB), Universitat de Barcelona, Carrer Martí i Franqués 1-11, 08028 Barcelona, Catalonia, Spain.
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13
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Wu Y, Zhang B, Zheng Y, Wang Y, Lei X. Cs2CO3-promoted defluorination and functionalization of α-CF3carbonyl compounds in the presence ofN-,O-, and/orS-nucleophiles. RSC Adv 2018; 8:16019-16023. [PMID: 35542242 PMCID: PMC9080061 DOI: 10.1039/c8ra02353k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2018] [Accepted: 04/13/2018] [Indexed: 11/21/2022] Open
Abstract
A simple, efficient, and mild method for defluorination and functionalization of 3,3,3-trifluoro carbonyl compounds has been developed. In the present method, Cs2CO3 can easily convert α-trifluoromethyl esters, amides, and ketones into β,β-S-, O- and/or N-substituted α,β-unsaturated carbonyl compounds in the presence of N-, O-, and S-nucleophiles with moderate to excellent yields, and furthermore, this transformation with α-trifluoromethyl ester and a series of 2-aminophenols can result in benzooxazoles in good yields. Cs2CO3-promoted defluorination and functionalization of α-CF3 carbonyl compounds.![]()
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Affiliation(s)
- Yue Wu
- School of Pharmacy
- Fudan University
- Shanghai 201203
- China
| | | | - Yinying Zheng
- School of Pharmacy
- Fudan University
- Shanghai 201203
- China
| | - Yuheng Wang
- School of Pharmacy
- Fudan University
- Shanghai 201203
- China
| | - Xinsheng Lei
- School of Pharmacy
- Fudan University
- Shanghai 201203
- China
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14
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van Leest NP, Epping RF, van Vliet KM, Lankelma M, van den Heuvel EJ, Heijtbrink N, Broersen R, de Bruin B. Single-Electron Elementary Steps in Homogeneous Organometallic Catalysis. ADVANCES IN ORGANOMETALLIC CHEMISTRY 2018. [DOI: 10.1016/bs.adomc.2018.07.002] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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15
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Heras C, Gómez-Palomino A, Romea P, Urpí F, Bofill JM, Moreira IDPR. Experimental and Computational Evidence of the Biradical Structure and Reactivity of Titanium(IV) Enolates. J Org Chem 2017; 82:8909-8916. [PMID: 28783338 DOI: 10.1021/acs.joc.7b01174] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Quantum chemical calculations have unveiled the unexpected biradical character of titanium(IV) enolates from N-acyl oxazolidinones and thiazolidinethiones. The electronic structure of these species therefore involves a valence tautomerism consisting of an equilibrium between a closed shell (formally Ti(IV) enolates) and an open shell, biradical, singlet (formally Ti(III) enolates) electronic states, whose origin is to be basically found in changes of the Ti-O distance. Spectroscopic studies of the intermediate species lend support to such a model, which also turns out to be crucial for a better understanding of the overall reactivity of titanium(IV) enolates. In this context, a thorough computational analysis of the radical addition of titanium(IV) enolates from N-acyl oxazolidinones to TEMPO has permitted us to suggest an entire mechanism, which accounts for the experimental details and the diastereoselectivity of the process. All together, this evidence highlights the relevance of biradical intermediates from titanium(IV) enolates and may be a useful contribution to the foundations of a more insightful comprehension of the structure and reactivity of titanium(IV) enolates.
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Affiliation(s)
- Carlos Heras
- Departament de Química Inorgànica i Orgànica, Secció de Química Orgànica. Universitat de Barcelona , Carrer Martí i Franquès 1-11, 08028 Barcelona, Catalonia, Spain
| | - Alejandro Gómez-Palomino
- Departament de Química Inorgànica i Orgànica, Secció de Química Orgànica. Universitat de Barcelona , Carrer Martí i Franquès 1-11, 08028 Barcelona, Catalonia, Spain.,Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona , Avinguda Diagonal 645, 08028 Barcelona, Catalonia, Spain
| | - Pedro Romea
- Departament de Química Inorgànica i Orgànica, Secció de Química Orgànica. Universitat de Barcelona , Carrer Martí i Franquès 1-11, 08028 Barcelona, Catalonia, Spain.,Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona , Avinguda Diagonal 645, 08028 Barcelona, Catalonia, Spain
| | - Fèlix Urpí
- Departament de Química Inorgànica i Orgànica, Secció de Química Orgànica. Universitat de Barcelona , Carrer Martí i Franquès 1-11, 08028 Barcelona, Catalonia, Spain.,Institut de Biomedicina de la Universitat de Barcelona (IBUB), Universitat de Barcelona , Avinguda Diagonal 645, 08028 Barcelona, Catalonia, Spain
| | - Josep Maria Bofill
- Departament de Química Inorgànica i Orgànica, Secció de Química Orgànica. Universitat de Barcelona , Carrer Martí i Franquès 1-11, 08028 Barcelona, Catalonia, Spain.,Institut de Química Teòrica i Computacional de la Universitat de Barcelona (IQTCUB), Universitat de Barcelona , Carrer Martı́ i Franquès 1-11, 08028 Barcelona, Catalonia, Spain
| | - Ibério de P R Moreira
- Institut de Química Teòrica i Computacional de la Universitat de Barcelona (IQTCUB), Universitat de Barcelona , Carrer Martı́ i Franquès 1-11, 08028 Barcelona, Catalonia, Spain.,Departament de Ciència dels Materials i Química Física, Secció de Química Física, Universitat de Barcelona , Carrer Martí i Franquès 1-11, 08028 Barcelona, Catalonia, Spain
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16
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Taninokuchi S, Yazaki R, Ohshima T. Catalytic Aerobic Chemoselective α-Oxidation of Acylpyrazoles en Route to α-Hydroxy Acid Derivatives. Org Lett 2017; 19:3187-3190. [DOI: 10.1021/acs.orglett.7b01293] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Seiya Taninokuchi
- Graduate School of Pharmaceutical
Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Ryo Yazaki
- Graduate School of Pharmaceutical
Sciences, Kyushu University, Fukuoka 812-8582, Japan
| | - Takashi Ohshima
- Graduate School of Pharmaceutical
Sciences, Kyushu University, Fukuoka 812-8582, Japan
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17
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Wang C, Zhang L, You J. Nickel-Catalyzed Aminoxylation of Inert Aliphatic C(sp3)–H Bonds with Stable Nitroxyl Radicals under Air: One-Pot Route to α-Formyl Acid Derivatives. Org Lett 2017; 19:1690-1693. [DOI: 10.1021/acs.orglett.7b00479] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Chunxia Wang
- Key Laboratory of Green Chemistry
and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, P.R. China
| | - Luoqiang Zhang
- Key Laboratory of Green Chemistry
and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, P.R. China
| | - Jingsong You
- Key Laboratory of Green Chemistry
and Technology of Ministry of Education, College of Chemistry, Sichuan University, 29 Wangjiang Road, Chengdu 610064, P.R. China
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18
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Zhang L, Zhu L, Yang J, Luo J, Hong R. Stereoselective α-Hydroxylation of Amides Using Oppolzer's Sultam as Chiral Auxiliary. J Org Chem 2016; 81:3890-900. [PMID: 27035800 DOI: 10.1021/acs.joc.6b00068] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An Oppolzer's sultam-based highly stereoselective α-hydroxylation of amides was developed to deliver the desired products in good yield and excellent diastereoselectivity (>20/1). The generally crystalline products and the recyclability of the chiral auxiliary illustrate the practicability and scalability of the current approach.
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Affiliation(s)
- Lumin Zhang
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, P. R. China
| | - Lili Zhu
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, P. R. China
| | - Jun Yang
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, P. R. China
| | - Jisheng Luo
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, P. R. China
| | - Ran Hong
- CAS Key Laboratory of Synthetic Chemistry of Natural Substances, Shanghai Institute of Organic Chemistry, Chinese Academy of Sciences , 345 Lingling Road, Shanghai 200032, P. R. China
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19
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Li L, Yu Z, Shen Z. Copper-Catalyzed Aminoxylation of Different Types of Hydrocarbons with TEMPO: A Concise Route toN-Alkoxyamine Derivatives. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500544] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
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20
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Heras C, Ramos-Tomillero I, Caballero M, Paradís-Bas M, Nicolás E, Albericio F, de P. R. Moreira I, Bofill JM. On the Mechanism of Phenolic Formylation Mediated by TiCl4Complexes: Existence of Diradical Intermediates Induced by Valence Tautomerism. European J Org Chem 2015. [DOI: 10.1002/ejoc.201403548] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Kondoh A, Terada M. Brønsted base-catalyzed α-oxygenation of carbonyl compounds utilizing the [1,2]-phospha-Brook rearrangement. Org Chem Front 2015. [DOI: 10.1039/c5qo00108k] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A novel α-oxygenation reaction of carbonyl compounds was developed by utilizing the [1,2]-phospha-Brook rearrangement under Brønsted base catalysis.
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Affiliation(s)
- Azusa Kondoh
- Research and Analytical Center for Giant Molecules
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
| | - Masahiro Terada
- Research and Analytical Center for Giant Molecules
- Graduate School of Science
- Tohoku University
- Sendai 980-8578
- Japan
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