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Chen T, Gong F, Nagaraju S, Liu J, Yang S, Chen X, Fang X. Oxa-Nazarov Cyclization-Michael Addition Sequence for the Rapid Construction of Dihydrofuranones. Org Lett 2022; 24:8837-8842. [PMID: 36417711 DOI: 10.1021/acs.orglett.2c03601] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
The Nazarov cyclization has been established as a powerful tool in constructing cyclopentenone skeletons. In sharp contrast, oxa-Nazarov cyclization that affords dihydrofuranones, a new type of product, has been less explored. In this work, we report the I2-catalyzed oxa-Nazarov cyclization-Michael addition cascade between vinyl α-diketones and enones. The protocol allows access to a range of functionalized dihydrofuranones with good to high yields, and diverse further transformations on the products have been achieved. Furthermore, the mechanistic studies reveal that the 1,2-hydride shift occurs simultaneously during the dihydrofuranone formation.
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Affiliation(s)
- Ting Chen
- College of Chemistry, Fuzhou University, Fuzhou 350116, China
| | - Fan Gong
- College of Chemistry, Fuzhou University, Fuzhou 350116, China
| | - Sakkani Nagaraju
- State Key Laboratory of Structural Chemistry and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
| | - Jinggong Liu
- Orthopedics Department, Guangdong Provincial Hospital of Traditional Chinese Medicine, The Second Affiliated Hospital of Guangzhou University of Chinese Medicine, Guangzhou 510120, China
| | - Shuang Yang
- State Key Laboratory of Structural Chemistry and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
| | - Xingkuan Chen
- Guangdong Provincial Key Laboratory of Functional Supramolecular Coordination Materials and Applications, Department of Chemistry, Jinan University, Guangzhou 510632, China
| | - Xinqiang Fang
- College of Chemistry, Fuzhou University, Fuzhou 350116, China
- State Key Laboratory of Structural Chemistry and Key Laboratory of Coal to Ethylene Glycol and Its Related Technology, Center for Excellence in Molecular Synthesis, Fujian Institute of Research on the Structure of Matter, University of Chinese Academy of Sciences, Fuzhou 350100, China
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Abstract
Interrupted reactions reroute established processes to new and often unanticipated end points. Of particular interest are the cases in which a known reactive intermediate takes on a new reaction pathway, either because this pathway is lower in energy or because the conventional pathway is no longer available. Through analysis of documented cases, we aim to dissect the known interrupted reactions and trace their mechanistic origins. As new chemical processes are being discovered at a seemingly ever-increasing pace, it is likely that new interrupted reactions will continue to emerge. Our hope is that the cases considered in this Review will help identify new classes of these fascinating transformations.
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Affiliation(s)
- Anton V. Yadykov
- N. D. Zelinsky Institute of Organic ChemistryRussian Academy of Sciences 47 Leninsky prosp., 119991 Moscow Russian Federation
| | - Valerii Z. Shirinian
- N. D. Zelinsky Institute of Organic ChemistryRussian Academy of Sciences 47 Leninsky prosp., 119991 Moscow Russian Federation
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Feldmann A, Kehr G, Daniliuc CG, Mück-Lichtenfeld C, Erker G. Functionalization of Intramolecular Frustrated Lewis Pairs by 1,1-Carboboration with Conjugated Enynes. Chemistry 2015; 21:12456-64. [PMID: 26284948 DOI: 10.1002/chem.201502278] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Indexed: 11/11/2022]
Abstract
The vicinal P/B frustrated Lewis pair (FLP) Mes2PCH2CH2B(C6F5)2 undergoes 1,1-carboboration reactions with the Me3Si-substituted enynes to give ring-enlarged functionalized C3-bridged P/B FLPs. These serve as active FLPs in the activation of dihydrogen to give the respective zwitterionic [P]H(+)/[B]H(-) products. One such product shows activity as a metal-free catalyst for the hydrogenation of enamines or a bulky imine. The ring-enlarged FLPs contain dienylborane functionalities that undergo "bora-Nazarov"-type ring-closing rearrangements upon photolysis. A DFT study had shown that the dienylborane cyclization of such systems itself is endothermic, but a subsequent C6F5 migration is very favorable. Furthermore, substituted 2,5-dihydroborole products are derived from cyclization and C6F5 migration from the photolysis reaction. In the case of the six-membered annulation product, a subsequent stereoisomerization reaction takes place and the resultant compound undergoes a P/B FLP 1,2-addition reaction with a terminal alkyne with rearrangement.
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Affiliation(s)
- Andreas Feldmann
- Organisch-Chemisches Institut der Universität Münster, Corrensstr. 40, 48149 Münster (Germany)
| | - Gerald Kehr
- Organisch-Chemisches Institut der Universität Münster, Corrensstr. 40, 48149 Münster (Germany)
| | - Constantin G Daniliuc
- Organisch-Chemisches Institut der Universität Münster, Corrensstr. 40, 48149 Münster (Germany)
| | | | - Gerhard Erker
- Organisch-Chemisches Institut der Universität Münster, Corrensstr. 40, 48149 Münster (Germany).
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Möbus J, Kehr G, Daniliuc CG, Mück-Lichtenfeld C, Erker G. Observation of a Thermally Induced Bora-Nazarov Cyclization at a Phosphole Framework. Angew Chem Int Ed Engl 2015; 54:12366-9. [DOI: 10.1002/anie.201502850] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2015] [Indexed: 11/09/2022]
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Möbus J, Kehr G, Daniliuc CG, Mück-Lichtenfeld C, Erker G. Observation of a Thermally Induced Bora-Nazarov Cyclization at a Phosphole Framework. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502850] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Adler Yañez RA, Kehr G, Daniliuc CG, Schirmer B, Erker G. Formation of a dihydroborole by catalytic isomerization of a divinylborane. Dalton Trans 2014; 43:10794-800. [PMID: 24882640 DOI: 10.1039/c4dt01423e] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Diphenylamino(divinyl)borane (1a) adds two molar equivalents of Piers' borane [HB(C6F5)2] to give the expected double hydroboration product. In contrast diisopropylamino(divinyl)borane (1b) reacts cleanly already with one molar equivalent of HB(C6F5)2 to give the α-borylated tetrahydroborole derivative 10 in good yield. Subsequent treatment of 10 with benzaldehyde proceeded by retro-hydroboration to give the hydroboration product of the aldehyde plus the dihydroborole 3b. We were able to achieve the divinylborane to dihydroborole isomerization (1b to 3b) catalytically: treatment of diisopropylamino(divinyl)borane (1b) with 15 mol% of Piers' borane at elevated temperature gave (diisopropylamino)dihydroborole 3b in good yield.
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Affiliation(s)
- Raúl A Adler Yañez
- Organisch-Chemisches Institut, Universitat Münster, Corrensstraße 40, 48149 Münster, Germany.
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Grant TN, Rieder CJ, West FG. Interrupting the Nazarov reaction: domino and cascade processes utilizing cyclopentenyl cations. Chem Commun (Camb) 2009:5676-88. [PMID: 19774236 DOI: 10.1039/b908515g] [Citation(s) in RCA: 226] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Affiliation(s)
- Tina N Grant
- Department of Chemistry, Faculty of Science, E3-43 Gunning-Lemieux Chemistry Centre, University of Alberta, Edmonton, AB, Canada T6G 2G2
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Vorländer D, von Liebig H. Ueberführung des Dibenzalacetons in Derivate des Diphenylcyclopentans. ACTA ACUST UNITED AC 2006. [DOI: 10.1002/cber.190403701185] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Allen CFH. Carbonyl-bridged and related compounds. Structural assignments by nuclear magnetic resonance spectroscopy. CAN J CHEM 1967. [DOI: 10.1139/v67-199] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The spectral data, predominantly nuclear magnetic resonance spectra, of a number of carbonyl-bridged and related compounds have been examined. In most instances they confirm the structures arrived at by classical procedures, but in some instances revisions have been made.
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Thiele J, Ruggli P. Über Reduktionsversuche bei α,β-ungesättigten Ketonen und die Bildung von Indenderivaten. ACTA ACUST UNITED AC 1912. [DOI: 10.1002/jlac.19123930104] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Vorländer D, Siebert C, Weissheimer P, Rolle O. Addition von Säuren und Salzen zu αβ-ungesättigten Ketonen. ACTA ACUST UNITED AC 1905. [DOI: 10.1002/jlac.19053410102] [Citation(s) in RCA: 42] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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