1
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Yang Y, Chen J, Shi Y, Liu P, Feng Y, Peng Q, Xu S. Catalytic Enantioselective Primary C-H Borylation for Acyclic All-Carbon Quaternary Stereocenters. J Am Chem Soc 2024; 146:1635-1643. [PMID: 38182551 DOI: 10.1021/jacs.3c12266] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2024]
Abstract
Creating a perfect catalyst to operate enzyme-like chiral recognition has been a long-sought aim. A challenging example in this context is constructing acyclic all-carbon quaternary stereogenic centers by transition metal-catalyzed enantioselective C-H activation. We now report highly enantioselective iridium-catalyzed primary C-H borylation of α-all-carbon substituted 2,2-dimethyl amides enabled by a tailor-made chiral bidentate boryl ligand (CBL). The success of the current transformation is attributed to the CBL/iridium catalyst, which has a confined chiral pocket. This protocol provides a diverse array of acyclic all-carbon quaternary stereocenters with excellent enantiocontrol and distinct structural features. Computational study reveals that steric hindrance of CBL could regulate the type of dominant orbital interaction between the catalyst and substrate, which is crucial to conferring high chiral induction.
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Affiliation(s)
- Yuhuan Yang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Jingyao Chen
- State Key Laboratory of Elemento-Organic Chemistry, and Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Yongjia Shi
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
| | - Peizhi Liu
- State Key Laboratory of Elemento-Organic Chemistry, and Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Yuxiang Feng
- State Key Laboratory of Elemento-Organic Chemistry, and Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin 300071, China
| | - Qian Peng
- State Key Laboratory of Elemento-Organic Chemistry, and Tianjin Key Laboratory of Biosensing and Molecular Recognition, College of Chemistry, Nankai University, Tianjin 300071, China
- Haihe Laboratory of Sustainable Chemical Transformations, Tianjin 300192, China
| | - Senmiao Xu
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Lanzhou Institute of Chemical Physics, Chinese Academy of Sciences, Lanzhou 730000, China
- University of Chinese Academy of Sciences, Beijing 100049, China
- College of Material Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Hangzhou Normal University, Hangzhou 311121, China
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2
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Nagasundaram N, Peroli U, Venkatesh R, Vinoth N, Lalitha A. Eosin Y as a direct HAT photocatalyst for the synthesis of tetrahydrodipyrazolopyridines under white LED irradiation. Tetrahedron Lett 2023. [DOI: 10.1016/j.tetlet.2023.154366] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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3
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Jeremias N, Peschel MT, Jaschke C, de Vivie-Riedle R, Bach T. Photochemical Ring Contraction of 5,5-Dialkylcyclopent-2-enones and in situ Trapping by Primary Amines. J Org Chem 2022; 88:6294-6303. [PMID: 35786889 DOI: 10.1021/acs.joc.2c01156] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
If substituted in the 5,5-position, cyclopent-2-enones undergo a smooth photochemical rearrangement to ketenes. A concomitant cyclopropane formation occurs due to a 1,3-shift of the C5 carbon atom from the carbonyl carbon atom (C1) to carbon atom C3. In this study, the cyclopropyl-substituted ketene intermediates were trapped in situ by primary amines providing an efficient entry into 2,2-disubstituted cyclopropaneacetic amides (24 examples, 49-95% yield). A remarkable feature of the reaction is the fact that the photochemical rearrangement can occur from either the first excited singlet (S1) or the respective triplet state (T1). In line with experimental results (triplet quenching, sensitization), XMS-CASPT2 calculations support the existence of efficient reaction pathways to the intermediate ketene both on the singlet and on the triplet hypersurface.
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Affiliation(s)
- Noah Jeremias
- School of Natural Sciences, Department of Chemistry and Catalysis Research Center (CRC), Technical University of Munich, Lichtenbergstrasse 4, 85747 Garching, Germany
| | - Martin T Peschel
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 11, 81377 München, Germany
| | - Constantin Jaschke
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 11, 81377 München, Germany
| | - Regina de Vivie-Riedle
- Department Chemie, Ludwig-Maximilians-Universität München, Butenandtstrasse 11, 81377 München, Germany
| | - Thorsten Bach
- School of Natural Sciences, Department of Chemistry and Catalysis Research Center (CRC), Technical University of Munich, Lichtenbergstrasse 4, 85747 Garching, Germany
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4
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Hoffmann N. Heterocyclic Compounds in Enantioselective Photochemical Reactions. HETEROCYCLES 2022. [DOI: 10.1002/9783527832002.ch1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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5
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Rigotti T, Schwinger DP, Graßl R, Jandl C, Bach T. Enantioselective crossed intramolecular [2+2] photocycloaddition reactions mediated by a chiral chelating Lewis acid. Chem Sci 2022; 13:2378-2384. [PMID: 35310494 PMCID: PMC8864722 DOI: 10.1039/d2sc00113f] [Citation(s) in RCA: 9] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/07/2022] [Accepted: 02/01/2022] [Indexed: 12/01/2022] Open
Abstract
In intramolecular [2+2] photocycloaddition reactions, the two tethered olefins can approach each other in a straight or in a crossed fashion. Despite the fact that the latter reaction mode leads to intriguing, otherwise inaccessible bridged skeletons, there has so far not been any enantioselective variants thereof. This study concerned the crossed [2+2]-photocycloaddition of 2-(alkenyloxy)cyclohex-2-enones to bridged cyclobutanes. It was found that the reaction could be performed with high enantioselectivity (80–94% ee) under visible light conditions when employing a chiral rhodium Lewis acid as a catalyst (2 mol%). An enantioselective crossed [2+2] photocycloaddition is presented which proceeds under visible light irradiation in the presence of a chiral Lewis acidic metal complex. Chelation of two oxygen atoms to the metal centre accounts for the observed enantioface differentiation.![]()
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Affiliation(s)
- Thomas Rigotti
- School of Natural Sciences, Department Chemie, Catalysis Research Center (CRC), Technische Universität München 85747 Garching Germany +49 89 28913315 +49 89 28913330
| | - Daniel P Schwinger
- School of Natural Sciences, Department Chemie, Catalysis Research Center (CRC), Technische Universität München 85747 Garching Germany +49 89 28913315 +49 89 28913330
| | - Raphaela Graßl
- School of Natural Sciences, Department Chemie, Catalysis Research Center (CRC), Technische Universität München 85747 Garching Germany +49 89 28913315 +49 89 28913330
| | - Christian Jandl
- School of Natural Sciences, Department Chemie, Catalysis Research Center (CRC), Technische Universität München 85747 Garching Germany +49 89 28913315 +49 89 28913330
| | - Thorsten Bach
- School of Natural Sciences, Department Chemie, Catalysis Research Center (CRC), Technische Universität München 85747 Garching Germany +49 89 28913315 +49 89 28913330
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6
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Kim JY, Lee YS, Ryu DH. Ternary Electron Donor–Acceptor Complex Enabled Enantioselective Radical Additions to α, β-Unsaturated Carbonyl Compounds. ACS Catal 2021. [DOI: 10.1021/acscatal.1c04835] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Affiliation(s)
- Jae Yeon Kim
- Department of Chemistry, Sungkyunkwan University, Cheoncheon, Jangan, Suwon 16419, Korea
| | - Yea Suel Lee
- Department of Chemistry, Sungkyunkwan University, Cheoncheon, Jangan, Suwon 16419, Korea
| | - Do Hyun Ryu
- Department of Chemistry, Sungkyunkwan University, Cheoncheon, Jangan, Suwon 16419, Korea
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7
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Thierry T, Pfund E, Lequeux T. Metal-Free Aminomethylation of Aromatic Sulfones Promoted by Eosin Y. Chemistry 2021; 27:14826-14830. [PMID: 34464004 DOI: 10.1002/chem.202102124] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/15/2021] [Indexed: 11/11/2022]
Abstract
A metal-free α-aminomethylation of heteroaryls promoted by eosin Y under green light irradiation is reported. A large variety of α-trimethylsilylamines as precursor of α-aminomethyl radical species were engaged to functionalize sulfonyl-heteroaryls following a Homolytic Aromatic Substitution (HAS) pathway. This method has provided a range of α-aminoheteroaryl compounds including a functionalized natural product. The mechanism of this late-stage functionalization of aryls was investigated and suggests the formation of a sulfonyl radical intermediate over a reductive quenching cycle.
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Affiliation(s)
- Thibault Thierry
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507 ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050, Caen, France
| | - Emmanuel Pfund
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507 ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050, Caen, France
| | - Thierry Lequeux
- Normandie Université, Laboratoire de Chimie Moléculaire et Thioorganique LCMT UMR 6507 ENSICAEN, UNICAEN, CNRS, 6 Bd. du Maréchal Juin, 14050, Caen, France
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8
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Gant Kanegusuku AL, Roizen JL. Recent Advances in Photoredox-Mediated Radical Conjugate Addition Reactions: An Expanding Toolkit for the Giese Reaction. Angew Chem Int Ed Engl 2021; 60:21116-21149. [PMID: 33629454 PMCID: PMC8382814 DOI: 10.1002/anie.202016666] [Citation(s) in RCA: 97] [Impact Index Per Article: 32.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2020] [Indexed: 12/18/2022]
Abstract
Photomediated Giese reactions are at the forefront of radical chemistry, much like the classical tin-mediated Giese reactions were nearly forty years ago. With the global recognition of organometallic photocatalysts for the mild and tunable generation of carbon-centered radicals, chemists have developed a torrent of strategies to form previously inaccessible radical intermediates that are capable of engaging in intermolecular conjugate addition reactions. This Review summarizes advances in photoredox-mediated Giese reactions since 2013, with a focus on the breadth of methods that provide access to crucial carbon-centered radical intermediates that can engage in radical conjugate addition processes.
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Affiliation(s)
| | - Jennifer L Roizen
- Department of Chemistry, Duke University, Box 90346, Durham, NC, 27708-0354, USA
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9
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Visible-light photoredox-promoted desilylative allylation of α-silylamines: An efficient route to synthesis of homoallylic amines. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153357] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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10
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Xiong T, Zhang Q. Recent advances in the direct construction of enantioenriched stereocenters through addition of radicals to internal alkenes. Chem Soc Rev 2021; 50:8857-8873. [PMID: 34279014 DOI: 10.1039/d1cs00208b] [Citation(s) in RCA: 20] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The development of new synthetic methods involving radical intermediates to control the absolute configuration of newly formed stereocenters has seen unprecedented growth in the past few decades. Despite significant advances in this topic, catalytic asymmetric direct construction of stereocenters through addition of radicals to internal alkenes is of special interest due to its potential to simultaneously build (more than) two consecutive stereogenic centers. Methodologies such as chiral Lewis acid catalysis, organocatalysis, and transition metal catalysis have been successfully leveraged to exert enantiocontrol in this challenging domain. This tutorial review highlights the recent significant progress in the realm of rapidly and conveniently building enantioenriched stereocenters via addition of radicals to internal alkenes, with an emphasis on mechanistic scenarios governing the absolute stereochemistry and unmet challenges in this emerging and promising field.
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Affiliation(s)
- Tao Xiong
- Department of Chemistry, Jilin Province Key Laboratory of Organic Functional Molecular Design & Synthesis, Northeast Normal University, Changchun 130024, China.
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11
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Gant Kanegusuku AL, Roizen JL. Recent Advances in Photoredox‐Mediated Radical Conjugate Addition Reactions: An Expanding Toolkit for the Giese Reaction. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202016666] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
| | - Jennifer L. Roizen
- Department of Chemistry Duke University Box 90346 Durham NC 27708-0354 USA
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12
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Hahm H, Kim J, Ryoo JY, Han MS, Hong S. Photocatalytic carbocarboxylation of styrenes with CO 2 for the synthesis of γ-aminobutyric esters. Org Biomol Chem 2021; 19:6301-6312. [PMID: 34212945 DOI: 10.1039/d1ob00866h] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Metal-free photoredox-catalyzed carbocarboxylation of various styrenes with carbon dioxide (CO2) and amines to obtain γ-aminobutyric ester derivatives has been developed (up to 91% yield, 36 examples). The radical anion of (2,3,4,6)-3-benzyl-2,4,5,6-tetra(9H-carbazol-9-yl)benzonitrile (4CzBnBN) possessing a high reduction potential (-1.72 V vs. saturated calomel electrode (SCE)) easily reduces both electron-donating and electron-withdrawing group-substituted styrenes.
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Affiliation(s)
- Hyungwoo Hahm
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea.
| | - Jiyun Kim
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea.
| | - Jeong Yup Ryoo
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea.
| | - Min Su Han
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea.
| | - Sukwon Hong
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea. and School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
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13
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Winkler CK, Simić S, Jurkaš V, Bierbaumer S, Schmermund L, Poschenrieder S, Berger SA, Kulterer E, Kourist R, Kroutil W. Accelerated Reaction Engineering of Photo(bio)catalytic Reactions through Parallelization with an Open‐Source Photoreactor. CHEMPHOTOCHEM 2021. [DOI: 10.1002/cptc.202100109] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Christoph K. Winkler
- Institute of Chemistry NAWI Graz University of Graz Heinrichstraße 28 8010 Graz Austria
| | - Stefan Simić
- Institute of Chemistry NAWI Graz University of Graz Heinrichstraße 28 8010 Graz Austria
| | - Valentina Jurkaš
- Institute of Chemistry NAWI Graz University of Graz Heinrichstraße 28 8010 Graz Austria
| | - Sarah Bierbaumer
- Institute of Chemistry NAWI Graz University of Graz Heinrichstraße 28 8010 Graz Austria
| | - Luca Schmermund
- Institute of Chemistry NAWI Graz University of Graz Heinrichstraße 28 8010 Graz Austria
| | - Silvan Poschenrieder
- Institute of Chemistry NAWI Graz University of Graz Heinrichstraße 28 8010 Graz Austria
| | - Sarah A. Berger
- Institute of Chemistry NAWI Graz University of Graz Heinrichstraße 28 8010 Graz Austria
| | - Elisa Kulterer
- Institute of Chemistry NAWI Graz University of Graz Heinrichstraße 28 8010 Graz Austria
| | - Robert Kourist
- Institute of Molecular Biotechnology NAWI Graz Graz University of Technology Petersgasse 14 8010 Graz Austria
| | - Wolfgang Kroutil
- Institute of Chemistry NAWI Graz University of Graz Heinrichstraße 28 8010 Graz Austria
- BioTechMed Graz 8010 Graz Austria
- Field of Excellence BioHealth University of Graz 8010 Graz Austria
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14
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Hahm H, Baek D, Kim D, Park S, Ryoo JY, Hong S. Photoredox-Catalyzed α-Aminoalkylcarboxylation of Allenes with CO 2. Org Lett 2021; 23:3879-3884. [PMID: 33913718 DOI: 10.1021/acs.orglett.1c01011] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Abstract
The photoredox-catalyzed α-aminoalkylcarboxylation of aryl allenes with CO2 and N,N-dimethylanilines is reported for the first time (26 examples, up to 96% yield). In the case of electron-deficient allenes, good regioselectivity was observed (up to 94:6), exclusively generating kinetic products over thermodynamic products. This protocol is a novel synthetic method for highly functionalized β,γ-unsaturated γ-aminobutyric esters.
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Affiliation(s)
- Hyungwoo Hahm
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Doohyun Baek
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Dowon Kim
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Seongwook Park
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Jeong Yup Ryoo
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
| | - Sukwon Hong
- Department of Chemistry, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea.,School of Materials Science and Engineering, Gwangju Institute of Science and Technology, 123 Cheomdan-gwagiro, Buk-gu, Gwangju 61005, Republic of Korea
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15
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Asymmetric, visible light-mediated radical sulfinyl-Smiles rearrangement to access all-carbon quaternary stereocentres. Nat Chem 2021; 13:327-334. [DOI: 10.1038/s41557-021-00668-4] [Citation(s) in RCA: 37] [Impact Index Per Article: 12.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Accepted: 02/23/2021] [Indexed: 11/08/2022]
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16
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Design, synthesis and biological evaluation of indole-2-one derivatives as potent BRD4 inhibitors. Eur J Med Chem 2020; 208:112780. [PMID: 32883643 DOI: 10.1016/j.ejmech.2020.112780] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2020] [Revised: 08/16/2020] [Accepted: 08/19/2020] [Indexed: 11/23/2022]
Abstract
Bromodomain protein 4 (BRD4) plays a crucial role in transcriptional regulation and is considered to be a viable drug target for cancer treatment. Herein, we designed and synthesized a series of indole-2-one derivatives through scaffold hopping drug design. Most of the compounds showed potent BRD4 inhibitory activities and anti-proliferation activities in cancer cell lines. Especially, compound 12j exhibited excellent BRD4 inhibitory activities (BD1 IC50 = 19 nM, BD2 IC50 = 28 nM) and anti-proliferation potency with IC50 values of 4.75 μM and 1.35 μM in HT-29 and HL-60 cells, respectively. Additionally, docking studies showed that the hydrophobic pocket next to KAc region and WPF shelf were critical to the activity of the compound. Compound 12j could arrest the cell-cycle progression of HT-29 cells into the G1 phase and reduce the expression of c-Myc. Moreover, compound 12j exhibited favorable oral pharmacokinetic properties. All the results demonstrated that compound 12j was a potent BRD4 inhibitor and had merely potential for colon cancer treatment.
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17
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Singh H, Kamal A, Kumari S, Kumar D, Maury SK, Srivastava V, Singh S. Eosin Y-Catalyzed Synthesis of 3-Aminoimidazo[1,2- a]Pyridines via the HAT Process under Visible Light through Formation of the C-N Bond. ACS OMEGA 2020; 5:29854-29863. [PMID: 33251420 PMCID: PMC7689671 DOI: 10.1021/acsomega.0c03941] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/16/2020] [Accepted: 10/27/2020] [Indexed: 06/12/2023]
Abstract
A comfortable, environment-friendly, and metal-free approach for synthesizing the biologically important moiety aminoimidazopyridine through the multicomponent reaction of benzylamine, 2-aminopyridine, and t-butyl isocyanide under visible light using eosin Y as a photocatalyst has been developed. Inexpensive, nontoxic, the effortless accessibility of starting materials, and nonparticipation of particular glassware and a photoreactor system are important qualities of the current approach. Strangely, the mild conditions, environment-friendly, and enumerating tolerance of an extensive range of both electron-donating and electron-withdrawing groups are additional features of the approach.
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Affiliation(s)
- Himanshu
Kumar Singh
- Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Arsala Kamal
- Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Savita Kumari
- Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Dhirendra Kumar
- Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Suresh Kumar Maury
- Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Vandana Srivastava
- Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
| | - Sundaram Singh
- Department of Chemistry, Indian Institute of Technology (BHU), Varanasi 221005, Uttar Pradesh, India
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18
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Exploiting attractive non-covalent interactions for the enantioselective catalysis of reactions involving radical intermediates. Nat Chem 2020; 12:990-1004. [DOI: 10.1038/s41557-020-00561-6] [Citation(s) in RCA: 62] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/03/2020] [Accepted: 09/03/2020] [Indexed: 01/28/2023]
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19
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Zhang Q, Huang Y, Zhan LW, Tang WY, Hou J, Li BD. Photoredox-Catalyzed α-C(sp3)–H Activation of Unprotected Secondary Amines: Facile Access to 1,4-Dicarbonyl Compounds. Org Lett 2020; 22:7460-7464. [DOI: 10.1021/acs.orglett.0c02571] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Qian Zhang
- College of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Yan Huang
- College of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Le-Wu Zhan
- College of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Wan-Ying Tang
- College of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Jing Hou
- College of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Bin-Dong Li
- College of Chemical Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
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20
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Kim JY, Lee YS, Choi Y, Ryu DH. Enantioselective 1,2-Addition of α-Aminoalkyl Radical to Aldehydes via Visible-Light Photoredox Initiated Chiral Oxazaborolidinium Ion Catalysis. ACS Catal 2020. [DOI: 10.1021/acscatal.0c02443] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jae Yeon Kim
- Department of Chemistry, Sungkyunkwan University, Cheoncheon, Jangan, Suwon 16419, Korea
| | - Yea Suel Lee
- Department of Chemistry, Sungkyunkwan University, Cheoncheon, Jangan, Suwon 16419, Korea
| | - Yuna Choi
- Department of Chemistry, Sungkyunkwan University, Cheoncheon, Jangan, Suwon 16419, Korea
| | - Do Hyun Ryu
- Department of Chemistry, Sungkyunkwan University, Cheoncheon, Jangan, Suwon 16419, Korea
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21
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Plaza M, Jandl C, Bach T. Photochemical Deracemization of Allenes and Subsequent Chirality Transfer. Angew Chem Int Ed Engl 2020; 59:12785-12788. [PMID: 32390291 PMCID: PMC7537568 DOI: 10.1002/anie.202004797] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2020] [Indexed: 12/29/2022]
Abstract
Trisubstituted allenes with a 3-(1'-alkenylidene)-pyrrolidin-2-one motif were successfully deracemized (13 examples, 86-98 % ee) employing visible light (λ=420 nm) and a chiral triplet sensitizer as the catalyst (2.5 mol %). The photocatalyst likely operates by selective recognition of one allene enantiomer via hydrogen bonds and by a triplet-sensitized racemization process. Even a tetrasubstituted allene (45 % ee) and a seven-membered 3-(1'-alkenylidene)-azepan-2-one (62 % ee) could be enantiomerically enriched under the chosen conditions. It was shown that the axial chirality of the allenes can be converted into point chirality by a Diels-Alder (94-97 % ee) or a bromination reaction (91 % ee). Ring opening of the five-membered pyrrolidin-2-one was achieved without significantly compromising the integrity of the chirality axis (92 % ee).
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Affiliation(s)
- Manuel Plaza
- Department Chemie and Catalysis Research Center (CRC)Technische Universität MünchenLichtenbergstrasse 485747GarchingGermany
| | - Christian Jandl
- Department Chemie and Catalysis Research Center (CRC)Technische Universität MünchenLichtenbergstrasse 485747GarchingGermany
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC)Technische Universität MünchenLichtenbergstrasse 485747GarchingGermany
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22
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Saha D. Catalytic Enantioselective Radical Transformations Enabled by Visible Light. Chem Asian J 2020; 15:2129-2152. [PMID: 32463981 DOI: 10.1002/asia.202000525] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2020] [Revised: 05/27/2020] [Indexed: 12/11/2022]
Abstract
Visible light has been recognized as an economical and environmentally benign source of energy that enables chemoselective molecular activation of chemical reactions and hence reveal a new horizon for the design and discovery of novel chemical transformations. On the other hand, asymmetric catalysis represents an economic method to satisfy the increasing need for enantioenriched compounds in the chemical and pharmaceutical industries. Therefore, combining visible light photocatalysis with asymmetric catalysis creates a wider range of opportunities for the development of mechanistically unique reaction schemes. However, there arise two main problems like undesirable photochemical background reactions and difficulties in controlling the stereochemistry with highly reactive photochemical intermediates which can pose a serious challenge to the development of asymmetric visible light photocatalysis. In recent years, several methods have been developed to overcome these challenges. This review summarizes the recent advances in visible light-induced enantioselective reactions. We divide our discussion into four categories: Asymmetric photoredox organocatalysis, asymmetric transition metal photoredox catalysis, asymmetric photoredox Lewis acid catalysis and asymmetric photoinduced energy transfer catalysis. Special emphasis has been given to different catalytic activation modes that enable the construction of challenging carbon-carbon and carbon-heteroatom bond in an enantioselective fashion. A brief analysis of substrate scope and limitation as well as reaction mechanism of these reactions has been included.
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Affiliation(s)
- Debajyoti Saha
- Department of Chemistry, Krishnagar Govt. College, Krishnagar, Nadia, 741101, India
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23
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Hörmann FM, Kerzig C, Chung TS, Bauer A, Wenger OS, Bach T. Triplet Energy Transfer from Ruthenium Complexes to Chiral Eniminium Ions: Enantioselective Synthesis of Cyclobutanecarbaldehydes by [2+2] Photocycloaddition. Angew Chem Int Ed Engl 2020; 59:9659-9668. [PMID: 32166853 PMCID: PMC7318320 DOI: 10.1002/anie.202001634] [Citation(s) in RCA: 43] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/31/2020] [Revised: 03/12/2020] [Indexed: 12/30/2022]
Abstract
Chiral eniminium salts, prepared from α,β-unsaturated aldehydes and a chiral proline derived secondary amine, underwent, upon irradiation with visible light, a ruthenium-catalyzed (2.5 mol %) intermolecular [2+2] photocycloaddition to olefins, which after hydrolysis led to chiral cyclobutanecarbaldehydes (17 examples, 49-74 % yield), with high diastereo- and enantioselectivities. Ru(bpz)3 (PF6 )2 was utilized as the ruthenium catalyst and laser flash photolysis studies show that the catalyst operates exclusively by triplet-energy transfer (sensitization). A catalytic system was devised with a chiral secondary amine co-catalyst. In the catalytic reactions, Ru(bpy)3 (PF6 )2 was employed, and laser flash photolysis experiments suggest it undergoes both electron and energy transfer. However, experimental evidence supports the hypothesis that energy transfer is the only productive quenching mechanism. Control experiments using Ir(ppy)3 showed no catalysis for the intermolecular [2+2] photocycloaddition of an eniminium ion.
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Affiliation(s)
- Fabian M. Hörmann
- Department Chemie and Catalysis Research Center (CRC)Technische Universität MünchenLichtenbergstraße 485747GarchingGermany
| | - Christoph Kerzig
- Department of ChemistryUniversity of BaselSt. Johanns-Ring 194056BaselSwitzerland
| | - Tim S. Chung
- Department Chemie and Catalysis Research Center (CRC)Technische Universität MünchenLichtenbergstraße 485747GarchingGermany
| | - Andreas Bauer
- Department Chemie and Catalysis Research Center (CRC)Technische Universität MünchenLichtenbergstraße 485747GarchingGermany
| | - Oliver S. Wenger
- Department of ChemistryUniversity of BaselSt. Johanns-Ring 194056BaselSwitzerland
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC)Technische Universität MünchenLichtenbergstraße 485747GarchingGermany
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24
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Plaza M, Jandl C, Bach T. Photochemical Deracemization of Allenes and Subsequent Chirality Transfer. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202004797] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- Manuel Plaza
- Department Chemie and Catalysis Research Center (CRC) Technische Universität München Lichtenbergstrasse 4 85747 Garching Germany
| | - Christian Jandl
- Department Chemie and Catalysis Research Center (CRC) Technische Universität München Lichtenbergstrasse 4 85747 Garching Germany
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC) Technische Universität München Lichtenbergstrasse 4 85747 Garching Germany
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25
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Hörmann FM, Kerzig C, Chung TS, Bauer A, Wenger OS, Bach T. Triplet Energy Transfer from Ruthenium Complexes to Chiral Eniminium Ions: Enantioselective Synthesis of Cyclobutanecarbaldehydes by [2+2] Photocycloaddition. Angew Chem Int Ed Engl 2020. [DOI: 10.1002/ange.202001634] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Fabian M. Hörmann
- Department Chemie and Catalysis Research Center (CRC)Technische Universität München Lichtenbergstraße 4 85747 Garching Germany
| | - Christoph Kerzig
- Department of ChemistryUniversity of Basel St. Johanns-Ring 19 4056 Basel Switzerland
| | - Tim S. Chung
- Department Chemie and Catalysis Research Center (CRC)Technische Universität München Lichtenbergstraße 4 85747 Garching Germany
| | - Andreas Bauer
- Department Chemie and Catalysis Research Center (CRC)Technische Universität München Lichtenbergstraße 4 85747 Garching Germany
| | - Oliver S. Wenger
- Department of ChemistryUniversity of Basel St. Johanns-Ring 19 4056 Basel Switzerland
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC)Technische Universität München Lichtenbergstraße 4 85747 Garching Germany
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26
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Aramaki Y, Imaizumi N, Hotta M, Kumagai J, Ooi T. Exploiting single-electron transfer in Lewis pairs for catalytic bond-forming reactions. Chem Sci 2020; 11:4305-4311. [PMID: 34122888 PMCID: PMC8152713 DOI: 10.1039/d0sc01159b] [Citation(s) in RCA: 28] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
A single-electron transfer (SET) between tris(pentafluorophenyl)borane (B(C6F5)3) and N,N-dialkylanilines is reported, which is operative via the formation of an electron donor–acceptor (EDA) complex involving π-orbital interactions as a key intermediate under dark conditions or visible-light irradiation depending on the structure of the aniline derivatives. This inherent SET in the Lewis pairs initiates the generation of the corresponding α-aminoalkyl radicals and their additions to electron-deficient olefins, revealing the ability of B(C6F5)3 to act as an effective one-electron redox catalyst. Radical–ion pair generation from common Lewis pairs and its application to catalytic carbon–carbon bond formation.![]()
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Affiliation(s)
- Yoshitaka Aramaki
- Institute of Transformative Bio-Molecules (WPI-ITbM), Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University Nagoya 464-8601 Japan
| | - Naoki Imaizumi
- Institute of Transformative Bio-Molecules (WPI-ITbM), Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University Nagoya 464-8601 Japan
| | - Mao Hotta
- Institute of Transformative Bio-Molecules (WPI-ITbM), Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University Nagoya 464-8601 Japan
| | - Jun Kumagai
- Institute of Materials and Systems for Sustainability, Nagoya University Nagoya 464-8601 Japan
| | - Takashi Ooi
- Institute of Transformative Bio-Molecules (WPI-ITbM), Department of Molecular and Macromolecular Chemistry, Graduate School of Engineering, Nagoya University Nagoya 464-8601 Japan .,CREST, Japan Science and Technology Agency (JST), Nagoya University Nagoya 464-8601 Japan
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27
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Yin Y, Zhao X, Qiao B, Jiang Z. Cooperative photoredox and chiral hydrogen-bonding catalysis. Org Chem Front 2020. [DOI: 10.1039/d0qo00276c] [Citation(s) in RCA: 42] [Impact Index Per Article: 10.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Chiral hydrogen-bonding catalysis is a classic strategy in asymmetric organocatalysis. Recently, it has been used to cooperate with photoredox catalysis, becoming a powerful tool to access optical pure compounds via radical-based transformations.
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Affiliation(s)
- Yanli Yin
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
- College of Bioengineering
| | - Xiaowei Zhao
- Henan University
- Jinming Campus
- Kaifeng
- P. R. China
| | - Baokun Qiao
- Henan University
- Jinming Campus
- Kaifeng
- P. R. China
| | - Zhiyong Jiang
- School of Chemistry and Chemical Engineering
- Henan Normal University
- Xinxiang
- P. R. China
- Henan University
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28
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Organocatalysis Combined with Photocatalysis. Top Curr Chem (Cham) 2019; 377:37. [DOI: 10.1007/s41061-019-0265-0] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/01/2019] [Accepted: 11/01/2019] [Indexed: 12/11/2022]
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29
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Enantioconvergent photoredox radical-radical coupling catalyzed by a chiral-at-rhodium complex. Sci China Chem 2019. [DOI: 10.1007/s11426-019-9584-x] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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30
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Burg F, Bach T. Lactam Hydrogen Bonds as Control Elements in Enantioselective Transition-Metal-Catalyzed and Photochemical Reactions. J Org Chem 2019; 84:8815-8836. [DOI: 10.1021/acs.joc.9b01299] [Citation(s) in RCA: 45] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Finn Burg
- Department of Chemistry and Catalysis Research Center (CRC), Technical University of Munich, Lichtenbergstrasse 4, 85747 Garching, Germany
| | - Thorsten Bach
- Department of Chemistry and Catalysis Research Center (CRC), Technical University of Munich, Lichtenbergstrasse 4, 85747 Garching, Germany
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31
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Abstract
Abstract
This review summarizes results in the field of hydrogen-bond templated enantioselective photochemistry. It covers both the stoichemiometric use of templates derived from Kemp’s triacid as well as photocatalytic methods to achieve high enantioselectivities in photochemical processes.
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32
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Schmermund L, Jurkaš V, Özgen FF, Barone GD, Büchsenschütz HC, Winkler CK, Schmidt S, Kourist R, Kroutil W. Photo-Biocatalysis: Biotransformations in the Presence of Light. ACS Catal 2019. [DOI: 10.1021/acscatal.9b00656] [Citation(s) in RCA: 147] [Impact Index Per Article: 29.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Luca Schmermund
- Institute of Chemistry, University of Graz, NAWI Graz, BioTechMed Graz, BioHealth, Heinrichstrasse 28, 8010 Graz, Austria
| | - Valentina Jurkaš
- Institute of Chemistry, University of Graz, NAWI Graz, BioTechMed Graz, BioHealth, Heinrichstrasse 28, 8010 Graz, Austria
| | - F. Feyza Özgen
- Institute of Molecular Biotechnology, Graz University of Technology, NAWI Graz, Petersgasse 14, 8010 Graz, Austria
| | - Giovanni D. Barone
- Institute of Molecular Biotechnology, Graz University of Technology, NAWI Graz, Petersgasse 14, 8010 Graz, Austria
| | - Hanna C. Büchsenschütz
- Institute of Molecular Biotechnology, Graz University of Technology, NAWI Graz, Petersgasse 14, 8010 Graz, Austria
| | - Christoph K. Winkler
- Institute of Chemistry, University of Graz, NAWI Graz, BioTechMed Graz, BioHealth, Heinrichstrasse 28, 8010 Graz, Austria
| | - Sandy Schmidt
- Institute of Molecular Biotechnology, Graz University of Technology, NAWI Graz, Petersgasse 14, 8010 Graz, Austria
| | - Robert Kourist
- Institute of Molecular Biotechnology, Graz University of Technology, NAWI Graz, Petersgasse 14, 8010 Graz, Austria
| | - Wolfgang Kroutil
- Institute of Chemistry, University of Graz, NAWI Graz, BioTechMed Graz, BioHealth, Heinrichstrasse 28, 8010 Graz, Austria
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33
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Ansari MA, Yadav D, Soni S, Srivastava A, Singh MS. Visible-Light-Mediated Synthesis of 1,2,4-Dithiazolidines from β-Ketothioamides through a Hydrogen-Atom-Transfer Photocatalytic Approach of Eosin Y. J Org Chem 2019; 84:5404-5412. [DOI: 10.1021/acs.joc.9b00406] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
- Monish A. Ansari
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Dhananjay Yadav
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Sonam Soni
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Abhijeet Srivastava
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Maya Shankar Singh
- Department of Chemistry, Institute of Science, Banaras Hindu University, Varanasi 221005, India
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34
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Wu QY, Min QQ, Ao GZ, Liu F. Radical alkylation of para-quinone methides with 4-substituted Hantzsch esters/nitriles via organic photoredox catalysis. Org Biomol Chem 2019; 16:6391-6394. [PMID: 30141823 DOI: 10.1039/c8ob01641k] [Citation(s) in RCA: 31] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A novel photocatalytic protocol is herein described for the preparation of functionalized phenols via radical alkylation of para-quinone methides under transition-metal-free conditions. The reaction is external oxidant free and performed at ambient temperature upon visible light irradiation, allowing the access to various desired products in satisfactory yields. The readily available 4-alkyl-1,4-dihydropyridines serve as the effective alkyl radical precursors.
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Affiliation(s)
- Qing-Yan Wu
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Department of Medicinal Chemistry, College of Pharmaceutical Sciences, Soochow University, 199 Ren-Ai Road, Suzhou, Jiangsu 215123, People's Republic of China.
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35
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Ashley MA, Yamauchi C, Chu JCK, Otsuka S, Yorimitsu H, Rovis T. Photoredox‐Catalyzed Site‐Selective α‐C(sp
3
)−H Alkylation of Primary Amine Derivatives. Angew Chem Int Ed Engl 2019. [DOI: 10.1002/ange.201812227] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
| | - Chiaki Yamauchi
- Department of ChemistryColumbia University New York NY 10027 USA
| | - John C. K. Chu
- Department of ChemistryColorado State University Fort Collins CO 80523 USA
| | - Shinya Otsuka
- Department of ChemistryColumbia University New York NY 10027 USA
- Department of ChemistryGraduate School of ScienceKyoto University Sakyo-ku Kyoto 606-8502 Japan
| | - Hideki Yorimitsu
- Department of ChemistryGraduate School of ScienceKyoto University Sakyo-ku Kyoto 606-8502 Japan
| | - Tomislav Rovis
- Department of ChemistryColumbia University New York NY 10027 USA
- Department of ChemistryColorado State University Fort Collins CO 80523 USA
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36
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Ashley MA, Yamauchi C, Chu JCK, Otsuka S, Yorimitsu H, Rovis T. Photoredox-Catalyzed Site-Selective α-C(sp 3 )-H Alkylation of Primary Amine Derivatives. Angew Chem Int Ed Engl 2019; 58:4002-4006. [PMID: 30768740 DOI: 10.1002/anie.201812227] [Citation(s) in RCA: 91] [Impact Index Per Article: 18.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/24/2018] [Revised: 01/04/2019] [Indexed: 12/17/2022]
Abstract
The synthetic utility of tertiary amines to oxidatively generate α-amino radicals is well established, however, primary amines remain challenging because of competitive side reactions. This report describes the site-selective α-functionalization of primary amine derivatives through the generation of α-amino radical intermediates. Employing visible-light photoredox catalysis, primary sulfonamides are coupled with electron-deficient alkenes to efficiently and mildly construct C-C bonds. Interestingly, a divergence between intermolecular hydrogen-atom transfer (HAT) catalysis and intramolecular [1,5] HAT was observed through precise manipulation of the protecting group. This dichotomy was leveraged to achieve excellent α/δ site-selectivity.
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Affiliation(s)
- Melissa A Ashley
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | - Chiaki Yamauchi
- Department of Chemistry, Columbia University, New York, NY, 10027, USA
| | - John C K Chu
- Department of Chemistry, Colorado State University, Fort Collins, CO, 80523, USA
| | - Shinya Otsuka
- Department of Chemistry, Columbia University, New York, NY, 10027, USA.,Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Hideki Yorimitsu
- Department of Chemistry, Graduate School of Science, Kyoto University, Sakyo-ku, Kyoto, 606-8502, Japan
| | - Tomislav Rovis
- Department of Chemistry, Columbia University, New York, NY, 10027, USA.,Department of Chemistry, Colorado State University, Fort Collins, CO, 80523, USA
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37
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Ma J, Lin J, Zhao L, Harms K, Marsch M, Xie X, Meggers E. Synthesis of β-Substituted γ-Aminobutyric Acid Derivatives through Enantioselective Photoredox Catalysis. Angew Chem Int Ed Engl 2018; 57:11193-11197. [DOI: 10.1002/anie.201804040] [Citation(s) in RCA: 68] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2018] [Indexed: 12/15/2022]
Affiliation(s)
- Jiajia Ma
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Jiahui Lin
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Lifang Zhao
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Klaus Harms
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Michael Marsch
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Xiulan Xie
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Eric Meggers
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
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38
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Ma J, Lin J, Zhao L, Harms K, Marsch M, Xie X, Meggers E. Synthesis of β-Substituted γ-Aminobutyric Acid Derivatives through Enantioselective Photoredox Catalysis. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201804040] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Jiajia Ma
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Jiahui Lin
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Lifang Zhao
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Klaus Harms
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Michael Marsch
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Xiulan Xie
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
| | - Eric Meggers
- Fachbereich Chemie; Philipps-Universität Marburg; Hans-Meerwein-Strasse 4 35043 Marburg Germany
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39
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Grübel M, Bosque I, Altmann PJ, Bach T, Hess CR. Redox and photocatalytic properties of a Ni II complex with a macrocyclic biquinazoline (Mabiq) ligand. Chem Sci 2018; 9:3313-3317. [PMID: 29780460 PMCID: PMC5932533 DOI: 10.1039/c7sc05320g] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2017] [Accepted: 02/20/2018] [Indexed: 01/04/2023] Open
Abstract
We present a late, first row transition metal photosensitizer that promotes photocatalytic C-C bond formation. The title compound, [Ni(Mabiq)]OTf, as well as its one-electron reduced form, Ni(Mabiq), were synthesized and molecular structures of both were obtained. The electronic structure of the reduced complex additionally was characterized by spectroscopic and DFT computational methods. Notably, [NiII(Mabiq)]OTf is photoactive: reduction of the compound was achieved photochemically upon irradiation at λ = 457 nm and reductive quenching by NEt3. The performance of [Ni(Mabiq)]OTf as a photoredox catalyst was examined in the cyclization of a bromoalkyl-substituted indole. In this reaction, the first-row transition metal compound is comparable if not superior to [Ru(bpy)3]2+ in terms of efficiency (turnover number) and chemoselectivity. Studies using a series of sacrificial donor amines indicate that the excited state redox potential of [Ni(Mabiq)]+* is ≥1.25 V vs. SCE. This value is similar to the excited state potential of commonly employed noble metal based photocatalysts. The Ni-Mabiq compound thus provides a rare example of an earth-abundant photoredox catalyst.
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Affiliation(s)
- Michael Grübel
- Department of Chemistry , Catalysis Research Center (CRC) , Technische Universität München , 85747 Garching , Germany . ;
| | - Irene Bosque
- Department of Chemistry , Catalysis Research Center (CRC) , Technische Universität München , 85747 Garching , Germany . ;
| | - Philipp J Altmann
- Department of Chemistry , Catalysis Research Center (CRC) , Technische Universität München , 85747 Garching , Germany . ;
| | - Thorsten Bach
- Department of Chemistry , Catalysis Research Center (CRC) , Technische Universität München , 85747 Garching , Germany . ;
| | - Corinna R Hess
- Department of Chemistry , Catalysis Research Center (CRC) , Technische Universität München , 85747 Garching , Germany . ;
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40
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Corrigan N, Shanmugam S, Xu J, Boyer C. Photocatalysis in organic and polymer synthesis. Chem Soc Rev 2018; 45:6165-6212. [PMID: 27819094 DOI: 10.1039/c6cs00185h] [Citation(s) in RCA: 460] [Impact Index Per Article: 76.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
This review, with over 600 references, summarizes the recent applications of photoredox catalysis for organic transformation and polymer synthesis. Photoredox catalysts are metallo- or organo-compounds capable of absorbing visible light, resulting in an excited state species. This excited state species can donate or accept an electron from other substrates to mediate redox reactions at ambient temperature with high atom efficiency. These catalysts have been successfully implemented for the discovery of novel organic reactions and synthesis of added-value chemicals with an excellent control of selectivity and stereo-regularity. More recently, such catalysts have been implemented by polymer chemists to post-modify polymers in high yields, as well as to effectively catalyze reversible deactivation radical polymerizations and living polymerizations. These catalysts create new approaches for advanced organic transformation and polymer synthesis. The objective of this review is to give an overview of this emerging field to organic and polymer chemists as well as materials scientists.
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Affiliation(s)
- Nathaniel Corrigan
- Centre for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, UNSW Australia, Sydney, NSW 2052, Australia. and Australian Centre for NanoMedicine, School of Chemical Engineering, UNSW Australia, Sydney, NSW 2052, Australia
| | - Sivaprakash Shanmugam
- Centre for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, UNSW Australia, Sydney, NSW 2052, Australia.
| | - Jiangtao Xu
- Centre for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, UNSW Australia, Sydney, NSW 2052, Australia. and Australian Centre for NanoMedicine, School of Chemical Engineering, UNSW Australia, Sydney, NSW 2052, Australia
| | - Cyrille Boyer
- Centre for Advanced Macromolecular Design (CAMD), School of Chemical Engineering, UNSW Australia, Sydney, NSW 2052, Australia. and Australian Centre for NanoMedicine, School of Chemical Engineering, UNSW Australia, Sydney, NSW 2052, Australia
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41
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Wu QY, Ao GZ, Liu F. Redox-neutral tri-/difluoromethylation of para-quinone methides with sodium sulfinates. Org Chem Front 2018. [DOI: 10.1039/c8qo00428e] [Citation(s) in RCA: 51] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A redox-neutral, mild, and simple protocol is developed for the synthesis of functionalized phenols from para-quinone methides upon visible-light irradiation.
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Affiliation(s)
- Qing-Yan Wu
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Department of Medicinal Chemistry
- College of Pharmaceutical Sciences
- Soochow University
- Suzhou
- People's Republic of China
| | - Gui-Zhen Ao
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Department of Medicinal Chemistry
- College of Pharmaceutical Sciences
- Soochow University
- Suzhou
- People's Republic of China
| | - Feng Liu
- Jiangsu Key Laboratory of Neuropsychiatric Diseases and Department of Medicinal Chemistry
- College of Pharmaceutical Sciences
- Soochow University
- Suzhou
- People's Republic of China
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42
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Hörmann FM, Chung TS, Rodriguez E, Jakob M, Bach T. Evidence for Triplet Sensitization in the Visible-Light-Induced [2+2] Photocycloaddition of Eniminium Ions. Angew Chem Int Ed Engl 2017; 57:827-831. [PMID: 29178574 PMCID: PMC5768022 DOI: 10.1002/anie.201710441] [Citation(s) in RCA: 65] [Impact Index Per Article: 9.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2017] [Indexed: 11/08/2022]
Abstract
Εniminium ions were prepared from the corresponding α,β-unsaturated carbonyl compounds (enones and enals), and were found to be promoted to their respective triplet states by energy transfer. The photoexcited intermediates underwent intra- or intermolecular [2+2] photocycloaddition in good yields (50-78 %) upon irradiation at λ=433 nm or λ=457 nm. Iridium or ruthenium complexes with a sufficiently high triplet energy were identified as efficient catalysts (2.5 mol % catalyst loading) for the reaction. The intermolecular [2+2] photocycloaddition of an eniminium ion derived from a chiral secondary amine proceeded with high enantioselectivity (88 % ee).
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Affiliation(s)
- Fabian M Hörmann
- Department Chemie und Catalysis Research Center, CRC, Technische Universität München, Lichtenbergstrasse 4, 85747, Garching, Germany
| | - Tim S Chung
- Department Chemie und Catalysis Research Center, CRC, Technische Universität München, Lichtenbergstrasse 4, 85747, Garching, Germany
| | - Elsa Rodriguez
- Department Chemie und Catalysis Research Center, CRC, Technische Universität München, Lichtenbergstrasse 4, 85747, Garching, Germany
| | - Matthias Jakob
- Department Chemie und Catalysis Research Center, CRC, Technische Universität München, Lichtenbergstrasse 4, 85747, Garching, Germany
| | - Thorsten Bach
- Department Chemie und Catalysis Research Center, CRC, Technische Universität München, Lichtenbergstrasse 4, 85747, Garching, Germany
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43
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Hörmann FM, Chung TS, Rodriguez E, Jakob M, Bach T. Hinweise auf eine Triplett‐Sensibilisierung in der [2+2]‐Photocycloaddition von Eniminiumionen mit sichtbarem Licht. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201710441] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Fabian M. Hörmann
- Department Chemie und Catalysis Research Center, CRCTechnische Universität München Lichtenbergstraße 4 85747 Garching Deutschland
| | - Tim S. Chung
- Department Chemie und Catalysis Research Center, CRCTechnische Universität München Lichtenbergstraße 4 85747 Garching Deutschland
| | - Elsa Rodriguez
- Department Chemie und Catalysis Research Center, CRCTechnische Universität München Lichtenbergstraße 4 85747 Garching Deutschland
| | - Matthias Jakob
- Department Chemie und Catalysis Research Center, CRCTechnische Universität München Lichtenbergstraße 4 85747 Garching Deutschland
| | - Thorsten Bach
- Department Chemie und Catalysis Research Center, CRCTechnische Universität München Lichtenbergstraße 4 85747 Garching Deutschland
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44
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Kumar K, Jaiswal MK, Singh RP. Asymmetric Vinylogous Aldol Reaction ofα-ketoesters with 3-alkylidene oxindoles. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700758] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Affiliation(s)
- Krishna Kumar
- Department of Chemistry; Indian Institute of Technology, Delhi, Hauz Khas; New Delhi - 110 016 India
| | - Manish K. Jaiswal
- Department of Chemistry; Indian Institute of Technology, Delhi, Hauz Khas; New Delhi - 110 016 India
| | - Ravi P. Singh
- Department of Chemistry; Indian Institute of Technology, Delhi, Hauz Khas; New Delhi - 110 016 India
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45
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Edtmüller V, Pöthig A, Bach T. Enantioselective photocyclisation reactions of 2-aryloxycyclohex-2-enones mediated by a chiral copper-bisoxazoline complex. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.05.005] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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46
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Rossetti A, Sacchetti A, Bonfanti M, Roda G, Rainoldi G, Silvani A. Biocatalysed olefin reduction of 3-alkylidene oxindoles by baker's yeast. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.06.022] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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47
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Lipp B, Lipp A, Detert H, Opatz T. Light-Induced Alkylation of (Hetero)aromatic Nitriles in a Transition-Metal-Free C–C-Bond Metathesis. Org Lett 2017; 19:2054-2057. [DOI: 10.1021/acs.orglett.7b00652] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Benjamin Lipp
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Alexander Lipp
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Heiner Detert
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Till Opatz
- Institute of Organic Chemistry, University of Mainz, Duesbergweg 10-14, D-55128 Mainz, Germany
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48
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Brenninger C, Pöthig A, Bach T. Brønsted Acid Catalysis in Visible-Light-Induced [2+2] Photocycloaddition Reactions of Enone Dithianes. Angew Chem Int Ed Engl 2017; 56:4337-4341. [PMID: 28319302 PMCID: PMC5396283 DOI: 10.1002/anie.201700837] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2017] [Revised: 02/09/2017] [Indexed: 12/15/2022]
Abstract
1,3-Dithiane-protected enones (enone dithianes) were found to undergo an intramolecular [2+2] photocycloaddition under visible-light irradiation (λ=405 nm) in the presence of a Brønsted acid (7.5-10 mol %). Key to the success of the reaction is presumably the formation of colored thionium ions, which are intermediates of the catalytic cycle. Cyclobutanes were thus obtained in very good yields (78-90 %). It is also shown that the dithiane moiety can be reductively or oxidatively removed without affecting the photochemically constructed ring skeleton.
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Affiliation(s)
- Christoph Brenninger
- Department Chemie and Catalysis Research Center (CRC)Technische Universität MünchenLichtenbergstrasse 485747GarchingGermany
| | - Alexander Pöthig
- Department Chemie and Catalysis Research Center (CRC)Technische Universität MünchenLichtenbergstrasse 485747GarchingGermany
| | - Thorsten Bach
- Department Chemie and Catalysis Research Center (CRC)Technische Universität MünchenLichtenbergstrasse 485747GarchingGermany
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49
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Brenninger C, Pöthig A, Bach T. Brønsted-Säure-Katalyse der [2+2]-Photocycloaddition von Enondithianen bei Bestrahlung mit sichtbarem Licht. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201700837] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Christoph Brenninger
- Department Chemie und Catalysis Research Center (CRC); Technische Universität München; Lichtenbergstr. 4 85747 Garching Deutschland
| | - Alexander Pöthig
- Department Chemie und Catalysis Research Center (CRC); Technische Universität München; Lichtenbergstr. 4 85747 Garching Deutschland
| | - Thorsten Bach
- Department Chemie und Catalysis Research Center (CRC); Technische Universität München; Lichtenbergstr. 4 85747 Garching Deutschland
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50
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Nakajima K, Miyake Y, Nishibayashi Y. Synthetic Utilization of α-Aminoalkyl Radicals and Related Species in Visible Light Photoredox Catalysis. Acc Chem Res 2016; 49:1946-56. [PMID: 27505299 DOI: 10.1021/acs.accounts.6b00251] [Citation(s) in RCA: 292] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Abstract
Single electron oxidation of amines provides an efficient way to access synthetically useful α-aminoalkyl radicals as reactive intermediates. After the single electron oxidation of amines, fragmentation of the resulting radical cations proceeds to give the α-aminoalkyl radicals along with generation of a proton. In the synthetic utilization of the α-aminoalkyl radicals, precise control of single electron transfer is essential, because further oxidation of the α-aminoalkyl radicals occurs more easily than the starting amines and the α-aminoalkyl radicals are converted into the corresponding iminium ions. As a result, photoinduced single electron transfer is quite attractive in the synthetic utilization of the α-aminoalkyl radicals. Recently, visible light-photoredox catalysis using transition metal-polypyridyl complexes and other dyes as catalysts has attracted considerable attention, where useful molecular transformations can be achieved through the single electron transfer process between the excited catalysts and substrates. In this context, MacMillan et al. ( Science 2011, 334 , 1114 , DOI: 10.1126/science.1213920 ) reported an aromatic substitution reaction of cyanoarenes with amines, where α-aminoalkyl radicals work as key reactive intermediates. Pandey and Reiser et al. ( Org. Lett. 2012 , 14 , 672 , DOI: 10.1021/ol202857t ) and our group ( Nishibayashi et al. J. Am. Chem. Soc. 2012 , 134 , 3338 , DOI: 10.1021/ja211770y ) independently reported reactions of amines with α,β-unsaturated carbonyl compounds, where addition of α-aminoalkyl radicals to alkenes is a key step. After these earliest examples, nowadays, a variety of transformations using the α-aminoalkyl radicals as reactive intermediates have been reported by many groups. The α-aminoalkyl radicals are usually produced from amines by single electron oxidation and the subsequent deprotonation of the C-H bond adjacent to the nitrogen atom. In addition, the α-aminoalkyl radicals are also produced from α-silylamines and α-amino acids in high efficiency through desilylation or decarboxylation after the single electron oxidation. The generated α-aminoalkyl radicals are utilized in a variety of reaction systems. In fact, reactions based on the addition of α-aminoalkyl radicals to alkenes and other unsaturated bonds have been extensively studied. Aromatic and other types of substitution reactions have also been investigated. Some of these transformations are achieved by combination of photoredox catalysts and other catalysts such as Brønsted and Lewis acids, organocatalysts, and transition metal catalysts. It is also noteworthy that the enantioselective reactions have been accomplished by combination of photoredox catalysts and chiral catalysts. The strategy for the generation of α-aminoalkyl radicals can be applied to utilize other types of alkyl radicals. In the generation of α-aminoalkyl radicals, the bond dissociation of the radical cations occurs at the α-position of amines. In relation to this process, synthetic utilization of other types of alkyl radicals generated by the bond dissociation of the radical cations at a remote position has been also investigated. These alkyl radicals have been applied to molecular transformations in a manner similar to the α-aminoalkyl radicals. Recently, organic synthesis using the α-aminoalkyl radicals and related alkyl radicals has been studied extensively. In this Account, we describe recent advances in photoredox-catalyzed synthetic utilization of these alkyl radicals.
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Affiliation(s)
- Kazunari Nakajima
- Department of Systems Innovation,
School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yoshihiro Miyake
- Department of Systems Innovation,
School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
| | - Yoshiaki Nishibayashi
- Department of Systems Innovation,
School of Engineering, The University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113-8656, Japan
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