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Cao J, Zhu SF. Catalytic Enantioselective Proton Transfer Reactions. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2021. [DOI: 10.1246/bcsj.20200350] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Jin Cao
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
| | - Shou-Fei Zhu
- State Key Laboratory and Institute of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, P. R. China
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Eames J, Weerasooriya N. Recent Studies on the Regioselective C-Protonation of Enol Derivatives using Carbonyl-Containing Proton Donors. JOURNAL OF CHEMICAL RESEARCH 2019. [DOI: 10.3184/030823401103168154] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Enolate protonation can occur by two different pathways. With strong acids regioselective protonation generally occurs on the oxygen of the enolate to give an enol and then acid catalysed tautomerisation leads directly to the thermody-namically preferred carbonyl motif. However, with much weaker acids kinetic protonation on carbon can occur to give directly the carbonyl derivative. This review discuss recent developments into the use of chelating acids to promote this stereochemically important C-protonation and we comment on factors that appear to promote this selectivity.
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Affiliation(s)
- Jason Eames
- Department of Chemistry, Queen Mary, University of London, Mile End Road, London E1 4NS, UK
| | - Neluka Weerasooriya
- Department of Chemistry, Queen Mary, University of London, Mile End Road, London E1 4NS, UK
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Zhang L, Yuan P, Chen J, Huang Y. Enantioselective cooperative proton-transfer catalysis using chiral ammonium phosphates. Chem Commun (Camb) 2018; 54:1473-1476. [DOI: 10.1039/c7cc09549j] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Chiral phosphorate anions are shown to be highly enantioselective templates for proton-transfer catalysis.
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Affiliation(s)
- Linrui Zhang
- Key Laboratory of Chemical Genomics
- School of Chemical Biology and Biotechnology
- Shenzhen Graduate School of Peking University
- Shenzhen
- China
| | - Pengfei Yuan
- Key Laboratory of Chemical Genomics
- School of Chemical Biology and Biotechnology
- Shenzhen Graduate School of Peking University
- Shenzhen
- China
| | - Jiean Chen
- Key Laboratory of Chemical Genomics
- School of Chemical Biology and Biotechnology
- Shenzhen Graduate School of Peking University
- Shenzhen
- China
| | - Yong Huang
- Key Laboratory of Chemical Genomics
- School of Chemical Biology and Biotechnology
- Shenzhen Graduate School of Peking University
- Shenzhen
- China
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A novel reverse osmosis membrane with regenerable anti-biofouling and chlorine resistant properties. J Memb Sci 2013. [DOI: 10.1016/j.memsci.2013.02.010] [Citation(s) in RCA: 110] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Poisson T, Gembus V, Dalla V, Oudeyer S, Levacher V. Organocatalyzed enantioselective protonation of silyl enol ethers: scope, limitations, and application to the preparation of enantioenriched homoisoflavones. J Org Chem 2010; 75:7704-16. [PMID: 20958068 DOI: 10.1021/jo101585t] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In the present work, enantioselective protonation of silyl enol ethers is reported by means of a variety of chiral nitrogen bases as catalysts, mainly derived from cinchona alkaloids, in the presence of various protic nucleophiles as proton source. A detailed study of the most relevant reaction parameters is disclosed allowing high enantioselectivities of up to 92% ee with excellent yields to be achieved under mild and eco-friendly conditions. The synthetic utility of this organocatalytic protonation was demonstrated during the preparation of two homoisoflavones 4a and 4b, isolated from Chlorophytum Inornatum and Scilla Nervosa, which were obtained with 81% and 78% ee, respectively.
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Affiliation(s)
- Thomas Poisson
- Laboratoire de Chimie Organique Bio-organique Réactivité et Analyse (COBRA), CNRS UMR 6014 & FR 3038, Université et INSA de Rouen, Rue Tesnière, Mont-Saint-Aignan 76130-F, France
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Chuang TH, Fang JM, Bolm C. Preparation and Catalytic Enantioselective Reactions of C 3-Symmetric Tris(Oxazoline)s Derived from Kemp's Triacid. SYNTHETIC COMMUN 2007. [DOI: 10.1080/00397910008087200] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
Affiliation(s)
- Tsung-Hsun Chuang
- a Department of Chemistry , National Taiwan University , Taipei, Taiwan, 106, Republic of China Fax: E-mail:
| | - Jim-Min Fang
- a Department of Chemistry , National Taiwan University , Taipei, Taiwan, 106, Republic of China Fax: E-mail:
| | - Carsten Bolm
- b Institut für Organische Chemie der RWTH Aachen , Professor-Pirlet-Str. 1, D-52056, Aachen, Germany Fax: E-mail:
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Coumbarides GS, Eames J, Scheuermann JEW, Sibbons KF, Suggate MJ, Watkinson M. Enantioselective Protonation of a Lithium Enolate Derived from 2-Methyl-1-tetralone Using Chiral Sulfonamides. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2005. [DOI: 10.1246/bcsj.78.906] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Gil J, Medio-Simon M, Mancha G, Asensio G. Enantioselective Protonation of the Lithium Transient Enolate of2-Methyltetralone with 2-Sulfinyl Alcohols. European J Org Chem 2005. [DOI: 10.1002/ejoc.200400812] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Investigations into the enantioselective C-protonation of prostereogenic enolate(s) derived from N,N′-diisopropyl-2-phenylpropanamide using suicide C-based proton sources. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.10.090] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Duhamel L, Duhamel P, Plaquevent JC. Enantioselective protonations: fundamental insights and new concepts. ACTA ACUST UNITED AC 2004. [DOI: 10.1016/j.tetasy.2004.09.035] [Citation(s) in RCA: 184] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Ishibashi H, Ishihara K, Yamamoto H. Chiral proton donor reagents: tin tetrachloride--coordinated optically active binaphthol derivatives. CHEM REC 2002; 2:177-88. [PMID: 12112869 DOI: 10.1002/tcr.10020] [Citation(s) in RCA: 55] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
The Lewis acid-assisted chiral Brønsted acids (chiral LBAs), which are prepared from tin tetrachloride and optically active binaphthol derivatives, are highly effective chiral proton donor reagents for enantioselective protonation and biomimetic polyene cyclization. These chiral LBAs can directly protonate various silyl enol ethers and ketene disilyl acetals to give the corresponding alpha-aryl or alpha-halo ketones and alpha-arylcarboxylic acids, respectively, with high enantiomeric excess (up to 98% ee). A catalytic version of enantioselective protonation was also achieved using stoichiometric amounts of 2,6-dimethylphenol and catalytic amounts of monomethyl ether of optically active binaphthol in the presence of tin tetrachloride. The biomimetic cyclization of simple isoprenoids to polycyclic isoprenoids using chiral LBA is also described. This is the first example of a chiral Brønsted acid-induced enantioselective ene cyclization in synthetic chemistry. Geranyl phenyl ethers, o-geranylphenols, and homogeranylphenol derivatives were directly cyclized in the presence of (R)-binaphthol derivatives and tin tetrachloride (up to 90% ee). Compounds bearing a farnesyl group could also be cyclized under the same conditions to give the natural products (-)-ambrox((R)) and (-)-chromazonarol, and (-)-tetracyclic polyprenoids of sedimentary origin. These chiral LBAs recognize the prochiral face of a trisubstituted terminal olefin and site selectively generate carbocations on the substrates.
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Affiliation(s)
- Hideaki Ishibashi
- Graduate School of Engineering, Nagoya University, SORST, Japan Science and Technology Corporation, Furo-cho, Chikusa, Nagoya 464-8603, Japan
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Abstract
The catalytic enantioselective protonation of simple enolates was achieved using a catalytic amount of chiral imides and stoichiometric amount of achiral proton sources. Among the achiral proton sources examined in the protonation of the lithium enolate of 2,2,6-trimethylcyclohexanone catalyzed by (S,S)-imide 1, 2, 6-di-tert-butyl-p-cresol (BHT) and its derivatives gave the highest enantiomeric excess. For example, 90% ee of (R)-enriched ketone was obtained when (S,S)-imide 1 (0.1 equiv) and BHT (1 equiv) were used. Use of 0.01 equiv of the chiral catalyst still caused a high level of asymmetric induction. For catalytic protonation of the lithium enolate of 2-methylcyclohexanone, chiral imide 6 possessing a chiral amide portion was superior to (S,S)-imide 1 as a chiral proton source and the enolate was effectively protonated with up to 82% ee.
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Nakamura Y, Takeuchi S, Ohgo Y, Yamaoka M, Yoshida A, Mikami K. Enantioselective protonation of samarium enolates derived from α-heterosubstituted ketones and lactone by SmI2-mediated reduction. Tetrahedron 1999. [DOI: 10.1016/s0040-4020(99)00143-x] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Tietze LF, Schünke C. Synthesis of Enantiomerically Puretrans-1,2-Disubstituted Cyclopentanes and Cyclohexanes by Intramolecular Allylsilane Addition to Chiral Alkylidene-1,3-dicarbonyl Compounds. European J Org Chem 1998. [DOI: 10.1002/(sici)1099-0690(199810)1998:10<2089::aid-ejoc2089>3.0.co;2-c] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Shimizu M, Tsukamoto K, Matsutani T, Fujisawa T. Oxazaborolidine-mediated asymmetric reduction of 1,2-diaryl-2-benzyloxyiminoethanones and 1,2-diarylethanediones. Tetrahedron 1998. [DOI: 10.1016/s0040-4020(98)00483-9] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Yanagisawa A, Kikuchi T, Kuribayashi T, Yamamoto H. Enantioselective protonation of prochiral enolates with chiral imides. Tetrahedron 1998. [DOI: 10.1016/s0040-4020(98)00482-7] [Citation(s) in RCA: 43] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Krause N, Ebert S, Haubrich A. Diastereoselective Protonation of Chiral Enolates with Chelating Proton Donors under Reagent Control: Scope, Mechanism, and Applications. ACTA ACUST UNITED AC 1997. [DOI: 10.1002/jlac.199719971204] [Citation(s) in RCA: 41] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Shimizu M, Tsukamoto K, Fujisawa T. Stereodivergent approach to syn- and anti-2-amino-1,2-diarylethanols using oxazaborolidine-mediated asymmetric reduction. Tetrahedron Lett 1997. [DOI: 10.1016/s0040-4039(97)01125-8] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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Tietze LF, Schünke C. Intramolekulare Allylsilan-Addition an chirale Alkyliden-1,3-dicarbonylverbindungen zur Synthese enantiomerenreinertrans-1,2-disubstituierter Cyclopentane und Cyclohexane. Angew Chem Int Ed Engl 1995. [DOI: 10.1002/ange.19951071623] [Citation(s) in RCA: 11] [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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Fehr C, Galindo J. Syntheses of the Enantiomers of ?-Cyclogeranic Acid, ?-Cyclocitral, and ?-Damascone: Enantioselective protonation of enolates. Helv Chim Acta 1995. [DOI: 10.1002/hlca.19950780303] [Citation(s) in RCA: 49] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Lüning U, Wangnick C, Kümmerlin M. Regioselective Protonation of Allyllithium Compounds. ACTA ACUST UNITED AC 1994. [DOI: 10.1002/cber.19941271214] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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Krause N. Substituenteneffekte und Komplexierungsphänomene bei der diastereoselektiven Protonierung chiraler Enolate. Angew Chem Int Ed Engl 1994. [DOI: 10.1002/ange.19941061724] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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