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Zhou M, Wolzak LA, Li Z, de Zwart FJ, Mathew S, de Bruin B. Catalytic Synthesis of 1 H-2-Benzoxocins: Cobalt(III)-Carbene Radical Approach to 8-Membered Heterocyclic Enol Ethers. J Am Chem Soc 2021; 143:20501-20512. [PMID: 34802239 PMCID: PMC8662738 DOI: 10.1021/jacs.1c10927] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2021] [Indexed: 12/30/2022]
Abstract
The metallo-radical activation of ortho-allylcarbonyl-aryl N-arylsulfonylhydrazones with the paramagnetic cobalt(II) porphyrin catalyst [CoII(TPP)] (TPP = tetraphenylporphyrin) provides an efficient and powerful method for the synthesis of novel 8-membered heterocyclic enol ethers. The synthetic protocol is versatile and practical and enables the synthesis of a wide range of unique 1H-2-benzoxocins in high yields. The catalytic cyclization reactions proceed with excellent chemoselectivities, have a high functional group tolerance, and provide several opportunities for the synthesis of new bioactive compounds. The reactions are shown to proceed via cobalt(III)-carbene radical intermediates, which are involved in intramolecular hydrogen transfer (HAT) from the allylic position to the carbene radical, followed by a near-barrierless radical rebound step in the coordination sphere of cobalt. The proposed mechanism is supported by experimental observations, density functional theory (DFT) calculations, and spin trapping experiments.
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Affiliation(s)
- Minghui Zhou
- Homogeneous,
Supramolecular and Bio-Inspired Catalysis (HomKat) group, Van ‘t
Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Lukas A. Wolzak
- Homogeneous,
Supramolecular and Bio-Inspired Catalysis (HomKat) group, Van ‘t
Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Zirui Li
- Department
of Bioorganic Synthesis, Leiden Institute of Chemistry, Leiden University, Einsteinweg 55, 2333
CC Leiden, The Netherlands
| | - Felix J. de Zwart
- Homogeneous,
Supramolecular and Bio-Inspired Catalysis (HomKat) group, Van ‘t
Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Simon Mathew
- Homogeneous,
Supramolecular and Bio-Inspired Catalysis (HomKat) group, Van ‘t
Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
| | - Bas de Bruin
- Homogeneous,
Supramolecular and Bio-Inspired Catalysis (HomKat) group, Van ‘t
Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Science Park 904, 1098 XH Amsterdam, The Netherlands
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2
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Yoshioka S, Takehara T, Matsuzaki T, Suzuki T, Tsujino H, Uno T, Tsutsumi Y, Murai K, Fujioka H, Arisawa M. Direct synthesis of dialkylarylvinylsilane derivatives: metathesis of dialkylaryl-iso-propenylsilane and its application to tetracyclic silacycle dye synthesis. Chem Commun (Camb) 2019; 55:14070-14073. [DOI: 10.1039/c9cc06777a] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The metathesis of dialkylarylvinylsilane, which has not been accomplished to date, is achieved using dialkylaryl-iso-propenylsilane as a substrate.
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Affiliation(s)
- Shohei Yoshioka
- Graduate School of Pharmaceutical Sciences
- Osaka University
- Japan
| | | | - Tsuyoshi Matsuzaki
- The Institute of Scientific and Industrial Research
- Osaka University
- Japan
| | - Takeyuki Suzuki
- The Institute of Scientific and Industrial Research
- Osaka University
- Japan
| | | | - Tadayuki Uno
- Graduate School of Pharmaceutical Sciences
- Osaka University
- Japan
| | - Yasuo Tsutsumi
- Graduate School of Pharmaceutical Sciences
- Osaka University
- Japan
| | - Kenichi Murai
- Graduate School of Pharmaceutical Sciences
- Osaka University
- Japan
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3
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Ghosh AK, Brindisi M. Achmatowicz Reaction and its Application in the Syntheses of Bioactive Molecules. RSC Adv 2016; 6:111564-111598. [PMID: 28944049 PMCID: PMC5603243 DOI: 10.1039/c6ra22611f] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022] Open
Abstract
Substituted pyranones and tetrahydropyrans are structural subunits of many bioactive natural products. Considerable efforts are devoted toward the chemical synthesis of these natural products due to their therapeutic potential as well as low natural abundance. These embedded pyranones and tetrahydropyran structural motifs have been the subject of synthetic interest over the years. While there are methods available for the syntheses of these subunits, there are issues related to regio and stereochemical outcomes, as well as versatility and compatibility of reaction conditions and functional group tolerance. The Achmatowicz reaction, an oxidative ring enlargement of furyl alcohol, was developed in the 1970s. The reaction provides a unique entry to a variety of pyranone derivatives from functionalized furanyl alcohols. These pyranones provide convenient access to substituted tetrahydropyran derivatives. This review outlines general approaches to the synthesis of tetrahydropyrans, covering general mechanistic aspects of the Achmatowicz reaction or rearrangement with an overview of the reagents utilized for the Achmatowicz reaction. The review then focuses on the synthesis of functionalized tetrahydropyrans and pyranones and their applications in the synthesis of natural products and medicinal agents.
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Affiliation(s)
- Arun K. Ghosh
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA
| | - Margherita Brindisi
- Department of Chemistry and Department of Medicinal Chemistry, Purdue University, West Lafayette, IN 47907, USA
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4
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Cossy J, Guérinot A. Natural Products Containing Oxygen Heterocycles—Synthetic Advances Between 1990 and 2015. ADVANCES IN HETEROCYCLIC CHEMISTRY 2016. [DOI: 10.1016/bs.aihch.2016.03.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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5
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Yamamoto Y, Shibano S, Kurohara T, Shibuya M. Synthesis of β-Allylbutenolides via One-Pot Copper-Catalyzed Hydroallylation/Cyclization of γ-Hydroxybutynoate Derivatives. J Org Chem 2014; 79:4503-11. [DOI: 10.1021/jo500536b] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Yoshihiko Yamamoto
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Shinya Shibano
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Takashi Kurohara
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
| | - Masatoshi Shibuya
- Department of Basic Medicinal
Sciences, Graduate School of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601, Japan
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Mingat G, McDouall JJW, Clayden J. Dihydrothiophenes containing quaternary stereogenic centres by sequential stereospecific rearrangements and ring-closing metathesis. Chem Commun (Camb) 2014; 50:6754-7. [DOI: 10.1039/c4cc02596b] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Tandem stereospecific rearrangements by [3,3]-sigmatropic shift and N to C aryl migration give tertiary thiols that undergo ring closing metathesis to dihydrothiophenes.
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Affiliation(s)
- Gaëlle Mingat
- School of Chemistry
- University of Manchester
- Manchester M13 9PL, UK
| | | | - Jonathan Clayden
- School of Chemistry
- University of Manchester
- Manchester M13 9PL, UK
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8
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9
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Yamamoto Y. Copper-catalyzed Conjugate Addition of Organoboronic Acids and Esters to Electron-Deficient Alkynes. J SYN ORG CHEM JPN 2013. [DOI: 10.5059/yukigoseikyokaishi.71.296] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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10
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Huo HH, Xia XE, Zhang HK, Huang PQ. Enantioselective Total Syntheses of (−)-FR901483 and (+)-8-epi-FR901483. J Org Chem 2012; 78:455-65. [DOI: 10.1021/jo302362b] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Hao-Hua Huo
- Department of Chemistry, College
of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Xiao-Er Xia
- Department of Chemistry, College
of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Hong-Kui Zhang
- Department of Chemistry, College
of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
| | - Pei-Qiang Huang
- Department of Chemistry, College
of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian 361005, P. R. China
- The State Key Laboratory of
Elemento-Organic Chemistry, Nankai University, Tianjin 300071, P. R. China
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12
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Affiliation(s)
- Yoshihiko Yamamoto
- Department of Basic
Medicinal Sciences, Graduate School
of Pharmaceutical Sciences, Nagoya University, Chikusa, Nagoya 464-8601,
Japan
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Čusak A. Temporary Silicon-Tethered Ring-Closing Metathesis: Recent Advances in Methodology Development and Natural Product Synthesis. Chemistry 2012; 18:5800-24. [DOI: 10.1002/chem.201103186] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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14
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Yamamoto Y, Yamada S, Nishiyama H. Copper-Catalyzed Regio- and Stereoselective Conjugate Allylation of Electron-Deficient Alkynes with Allylboronates under Mild Conditions. Chemistry 2012; 18:3153-6. [DOI: 10.1002/chem.201103697] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2011] [Indexed: 12/28/2022]
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15
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Mahajan V, Gais H. Ring‐Closing Metathesis of Sulfoximine‐Substituted N‐Tethered Trienes: Modular Asymmetric Synthesis of Medium‐Ring Nitrogen Heterocycles. Chemistry 2011; 17:6187-95. [DOI: 10.1002/chem.201003172] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Indexed: 11/07/2022]
Affiliation(s)
- Vishal Mahajan
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany), Fax: (+49) 241‐8092665
- Present address: SAI Advantium Pharma Ltd, Chrysalis Enclave, International Biotech Park, Phase II, Hinjewadi, Pune 411057 (India)
| | - Hans‐Joachim Gais
- Institute of Organic Chemistry, RWTH Aachen University, Landoltweg 1, 52074 Aachen (Germany), Fax: (+49) 241‐8092665
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Yadav DB, Morgans GL, Aderibigbe BA, Madeley LG, Fernandes MA, Michael JP, de Koning CB, van Otterlo WA. Application of an isomerization-ring-closing metathesis strategy to the synthesis of unsaturated seven-membered, benzo-fused heterocycles containing two heteroatoms. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.02.035] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/28/2023]
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17
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Belen’kii L, Gramenitskaya V, Evdokimenkova Y. The Literature of Heterocyclic Chemistry, Part X, 2005–2007. ADVANCES IN HETEROCYCLIC CHEMISTRY 2011. [DOI: 10.1016/b978-0-12-385464-3.00001-7] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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18
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Aljarilla A, López JC, Plumet J. Metathesis Reactions of Carbohydrates: Recent Highlights in Cross‐Metathesis. European J Org Chem 2010. [DOI: 10.1002/ejoc.201000570] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ana Aljarilla
- Universidad Complutense, Facultad de Química, Departamento de Química Orgánica, Ciudad Universitaria s/n, 28040 Madrid, Spain, Fax: +34‐913944103
| | - J. Cristóbal López
- Instituto de Química Orgánica General (CSIC), Juan de la Cierva 3, 28006 Madrid, Spain
| | - Joaquín Plumet
- Universidad Complutense, Facultad de Química, Departamento de Química Orgánica, Ciudad Universitaria s/n, 28040 Madrid, Spain, Fax: +34‐913944103
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Mohamed S, Charmasson Y, Attolini M, Maffei M. Synthesis of cycloalkenyl geminal bisphosphonates by ring closing metathesis. HETEROATOM CHEMISTRY 2010. [DOI: 10.1002/hc.20622] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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20
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Lozano-Vila AM, Monsaert S, Bajek A, Verpoort F. Ruthenium-Based Olefin Metathesis Catalysts Derived from Alkynes. Chem Rev 2010; 110:4865-909. [PMID: 20392041 DOI: 10.1021/cr900346r] [Citation(s) in RCA: 175] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Ana M. Lozano-Vila
- Department of Inorganic and Physical Chemistry, Laboratory of Organometallic Chemistry and Catalysis, Ghent University, Krijgslaan 281 (S-3), 9000 Ghent, Belgium, Liaoning Provincial Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials, Liaoning University, Shenyang 110036, People’s Republic of China, and College of Chemistry, Liaoning University, Shenyang 110036, People’s Republic of China
| | - Stijn Monsaert
- Department of Inorganic and Physical Chemistry, Laboratory of Organometallic Chemistry and Catalysis, Ghent University, Krijgslaan 281 (S-3), 9000 Ghent, Belgium, Liaoning Provincial Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials, Liaoning University, Shenyang 110036, People’s Republic of China, and College of Chemistry, Liaoning University, Shenyang 110036, People’s Republic of China
| | - Agata Bajek
- Department of Inorganic and Physical Chemistry, Laboratory of Organometallic Chemistry and Catalysis, Ghent University, Krijgslaan 281 (S-3), 9000 Ghent, Belgium, Liaoning Provincial Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials, Liaoning University, Shenyang 110036, People’s Republic of China, and College of Chemistry, Liaoning University, Shenyang 110036, People’s Republic of China
| | - Francis Verpoort
- Department of Inorganic and Physical Chemistry, Laboratory of Organometallic Chemistry and Catalysis, Ghent University, Krijgslaan 281 (S-3), 9000 Ghent, Belgium, Liaoning Provincial Key Laboratory for Green Synthesis and Preparative Chemistry of Advanced Materials, Liaoning University, Shenyang 110036, People’s Republic of China, and College of Chemistry, Liaoning University, Shenyang 110036, People’s Republic of China
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21
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Bracegirdle S, Anderson EA. Recent advances in the use of temporary silicon tethers in metal-mediated reactions. Chem Soc Rev 2010; 39:4114-29. [DOI: 10.1039/c0cs00007h] [Citation(s) in RCA: 94] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Morgans GL, Ngidi EL, Madeley LG, Khanye SD, Michael JP, de Koning CB, van Otterlo WA. Synthesis of unsaturated 1,4-heteroatom-containing benzo-fused heterocycles using a sequential isomerization–ring-closing metathesis strategy. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.10.061] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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23
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van Otterlo WAL, de Koning CB. Metathesis in the synthesis of aromatic compounds. Chem Rev 2009; 109:3743-82. [PMID: 19618929 DOI: 10.1021/cr900178p] [Citation(s) in RCA: 247] [Impact Index Per Article: 16.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Willem A L van Otterlo
- Molecular Sciences Institute, School of Chemistry, University of the Witwatersrand, PO Wits 2050, South Africa.
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Hama N, Matsuda T, Sato T, Chida N. Total synthesis of (-)-agelastatin A: the application of a sequential sigmatropic rearrangement. Org Lett 2009; 11:2687-90. [PMID: 19449885 DOI: 10.1021/ol900799e] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
An enantioselective total synthesis of (-)-agelastatin A from (-)-2,3-O-isopropylidene-d-threitol is described. The sequential Overman/Mislow-Evans rearrangement of the allylic bistrichloroimidate is the key step, which efficiently installed a diaminohydroxy group.
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Affiliation(s)
- Naoto Hama
- Department of Applied Chemistry, Faculty of Science and Technology, Keio University, 3-14-1, Hiyoshi, Kohoku-ku, Yokohama 223-8522, Japan
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Kotha S, Meshram M, Tiwari A. Advanced approach to polycyclics by a synergistic combination of enyne metathesis and Diels-Alder reaction. Chem Soc Rev 2009; 38:2065-92. [PMID: 19551182 DOI: 10.1039/b810094m] [Citation(s) in RCA: 102] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Enyne metathesis (EM) has widely been used to prepare various synthetic and natural products. Further, a sequential use of EM and Diels-Alder (DA) reactions generates highly functionalized and intricate polycarbocycles and heterocyclic frameworks. In this critical review we describe the application of a unique combination of EM and DA reactions to prepare various amino acid derivatives, natural products and heterocycles. Some of the heterocyclic targets include cyclic peroxides, siloxanes and various nitrogen (or oxygen) containing compounds. Use of ethylene and cyclooctadiene (COD) for improving the yield of EM products are also discussed (69 references).
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Affiliation(s)
- Sambasivarao Kotha
- Department of Chemistry, Indian Institute of Technology-Bombay, Powai, Mumbai 400 076, India.
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Abbey ER, Zakharov LN, Liu SY. Crystal Clear Structural Evidence for Electron Delocalization in 1,2-Dihydro-1,2-azaborines. J Am Chem Soc 2008; 130:7250-2. [DOI: 10.1021/ja8024966] [Citation(s) in RCA: 172] [Impact Index Per Article: 10.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eric R. Abbey
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403
| | - Lev N. Zakharov
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403
| | - Shih-Yuan Liu
- Department of Chemistry, University of Oregon, Eugene, Oregon 97403
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Abdullah MN, Arrasate S, Lete E, Sotomayor N. Stereoselective synthesis of thiaerythrinanes based on an α-amidoalkylation/RCM approach. Tetrahedron 2008. [DOI: 10.1016/j.tet.2007.11.053] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Kotha S, Singh K. Cross-Enyne and Ring-Closing Metathesis Cascade: A Building-Block Approach Suitable for Diversity-Oriented Synthesis of Densely Functionalized Macroheterocycles with Amino Acid Scaffolds. European J Org Chem 2007. [DOI: 10.1002/ejoc.200700744] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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29
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Iyer K, Rainier JD. Olefinic ester and diene ring-closing metathesis using a reduced titanium alkylidene. J Am Chem Soc 2007; 129:12604-5. [PMID: 17900112 PMCID: PMC7077752 DOI: 10.1021/ja073880r] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Karthik Iyer
- Department of Chemistry, University of Utah, Salt Lake City, UT 84112, USA
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Panayides JL, Pathak R, de Koning CB, van Otterlo WAL. Synthesis of Substituted 2,3-Dihydro-1H-2-benzazepines and 1,2-Dihydroisoquinolines Using an Isomerization-Ring-Closing Metathesis Strategy: Scope and Limitations. European J Org Chem 2007. [DOI: 10.1002/ejoc.200700473] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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