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Recent advances in reactions promoted by amino acids and oligopeptides. PHYSICAL SCIENCES REVIEWS 2020. [DOI: 10.1515/psr-2018-0086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
During the last 20 years, Organocatalysis has become one of the major fields of Catalysis. Herein, we provide a recent overview on reactions where the use of amino acids and peptides as the organocatalysts was employed. All aspects regarding aldol reactions, Michael reactions, epoxidation, Henry reactions and many others that are crucial for the reaction conditions and reaction mechanisms are discussed.
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Ahmetlli A, Spiliopoulou N, Magi-Oikonomopoulou A, Gerokonstantis DT, Moutevelis-Minakakis P, Kokotos CG. Proline dipeptides containing fluorine moieties as oganocatalysts for the asymmetric aldol reaction. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.08.038] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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3
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Vlasserou I, Sfetsa M, Gerokonstantis DT, Kokotos CG, Moutevelis-Minakakis P. Combining prolinamides with 2-pyrrolidinone: Novel organocatalysts for the asymmetric aldol reaction. Tetrahedron 2018. [DOI: 10.1016/j.tet.2018.03.054] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
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Yamashita Y, Yasukawa T, Yoo WJ, Kitanosono T, Kobayashi S. Catalytic enantioselective aldol reactions. Chem Soc Rev 2018; 47:4388-4480. [DOI: 10.1039/c7cs00824d] [Citation(s) in RCA: 165] [Impact Index Per Article: 27.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Recent developments in catalytic asymmetric aldol reactions have been summarized.
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Affiliation(s)
- Yasuhiro Yamashita
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Tomohiro Yasukawa
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Woo-Jin Yoo
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Taku Kitanosono
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
| | - Shū Kobayashi
- Department of Chemistry
- School of Science
- The University of Tokyo
- Bunkyo-ku
- Japan
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Triandafillidi I, Bisticha A, Voutyritsa E, Galiatsatou G, Kokotos CG. tert-Butyl ester or benzylamide of the dipeptide Pro-Gly as organocatalysts for the asymmetric aldol reaction. Tetrahedron 2015. [DOI: 10.1016/j.tet.2014.12.078] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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6
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Henseler AH, Ayats C, Pericàs MA. An Enantioselective Recyclable Polystyrene-Supported Threonine-Derived Organocatalyst for Aldol Reactions. Adv Synth Catal 2014. [DOI: 10.1002/adsc.201400033] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Weng CC, Xu X, Xiong XX, Lu XL, Zhou YF. Telaprevir fragments as organocatalysts in asymmetric direct aldol reactions of aldehydes. RUSS J GEN CHEM+ 2014. [DOI: 10.1134/s1070363213120414] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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9
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Mlynarski J, Baś S. Catalytic asymmetric aldol reactions in aqueous media – a 5 year update. Chem Soc Rev 2014; 43:577-87. [DOI: 10.1039/c3cs60202h] [Citation(s) in RCA: 147] [Impact Index Per Article: 14.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
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tert-Butyl esters of tripeptides based on Pro-Phe as organocatalysts for the asymmetric aldol reaction in aqueous or organic medium. Tetrahedron 2014. [DOI: 10.1016/j.tet.2013.12.007] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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11
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Bisai V, Bisai A, Singh VK. Enantioselective organocatalytic aldol reaction using small organic molecules. Tetrahedron 2012. [DOI: 10.1016/j.tet.2012.03.099] [Citation(s) in RCA: 119] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
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Huang J, Chen G, Fu X, Li C, Wu C, Miao Q. Highly efficient direct large-scale stoichiometric aldol reactions catalyzed by a new diamine salt in the presence of water. Catal Sci Technol 2012. [DOI: 10.1039/c1cy00318f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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13
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Paradowska J, Pasternak M, Gut B, Gryzło B, Mlynarski J. Direct Asymmetric Aldol Reactions Inspired by Two Types of Natural Aldolases: Water-Compatible Organocatalysts and ZnII Complexes. J Org Chem 2011; 77:173-87. [DOI: 10.1021/jo201584w] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Joanna Paradowska
- Institute
of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224
Warsaw, Poland
| | - Monika Pasternak
- Faculty
of Chemistry, Jagiellonian University,
Ingardena 3, 30-060 Krakow,
Poland
| | - Bartosz Gut
- Faculty
of Chemistry, Jagiellonian University,
Ingardena 3, 30-060 Krakow,
Poland
| | - Beata Gryzło
- Faculty
of Chemistry, Jagiellonian University,
Ingardena 3, 30-060 Krakow,
Poland
| | - Jacek Mlynarski
- Institute
of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224
Warsaw, Poland
- Faculty
of Chemistry, Jagiellonian University,
Ingardena 3, 30-060 Krakow,
Poland
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Ma G, Bartoszewicz A, Ibrahem I, Córdova A. Highly Enantioselective Co-Catalytic Direct Aldol Reactions by Combination of Hydrogen-Bond Donating and Acyclic Amino Acid Catalysts. Adv Synth Catal 2011. [DOI: 10.1002/adsc.201100408] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
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Li Y, Yang QC, Xu XY, Zhou Y, Bai JF, Wang FY, Wang LX. A highly asymmetric direct aldol reaction catalyzed by chiral proline amide – thiourea bifunctional catalysts. CAN J CHEM 2011. [DOI: 10.1139/v11-029] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A series of chiral proline amide – thiourea bifunctional catalysts derived from l-proline and chiral diamine were prepared and successfully applied to highly enantioselective direct aldol reactions of cyclohexanone with various aldehydes in excellent yields (85%–97%), diastereoselectivities (anti/syn > 20:1) and enantioselectivities (up to 91% ee).
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Affiliation(s)
- Yun Li
- Department of Chemistry, Sichuan University, Chengdu 610041, China
| | - Qing-chuan Yang
- Key Laboratory of Asymmetric Synthesis & Chirotechnology of Sichuan Province, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Xiao-Ying Xu
- Key Laboratory of Asymmetric Synthesis & Chirotechnology of Sichuan Province, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Yong Zhou
- Key Laboratory of Asymmetric Synthesis & Chirotechnology of Sichuan Province, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Jian-fei Bai
- Key Laboratory of Asymmetric Synthesis & Chirotechnology of Sichuan Province, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Fei-ying Wang
- Key Laboratory of Asymmetric Synthesis & Chirotechnology of Sichuan Province, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
| | - Li-xin Wang
- Key Laboratory of Asymmetric Synthesis & Chirotechnology of Sichuan Province, Chengdu Institute of Organic Chemistry, Chinese Academy of Sciences, Chengdu 610041, China
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Wu C, Fu X, Li S. New simple and recyclable O-acylation serine derivatives as highly enantioselective catalysts for the large-scale asymmetric direct aldol reactions in the presence of water. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.03.083] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Abstract
The reversible reaction of primary or secondary amines with enolizable aldehydes or ketones affords nucleophilic intermediates, enamines. With chiral amines, catalytic enantioselective reactions via enamine intermediates become possible. In this review, structure-activity relationships and the scope as well as current limitations of enamine catalysis are discussed.
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Yong FF, Teo YC. Recyclable Siloxy Serine Organocatalyst for the Direct Asymmetric Mannich Reactions in Ionic Liquids. SYNTHETIC COMMUN 2011. [DOI: 10.1080/00397911.2010.481750] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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19
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Wu C, Fu X, Li S. A Highly Efficient, Large-Scale, Asymmetric Direct Aldol Reaction Employing Simple Threonine Derivatives as Recoverable Organocatalysts in the Presence of Water. European J Org Chem 2011. [DOI: 10.1002/ejoc.201001396] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Pedrosa R, Andrés JM, Manzano R, Román D, Téllez S. Highly diastereo- and enantioselective direct Barbas-List aldol reactions promoted by novel benzamidoethyl and benzamidopropyl prolinamides in water. Org Biomol Chem 2010; 9:935-40. [PMID: 21152568 DOI: 10.1039/c0ob00688b] [Citation(s) in RCA: 39] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Four novel benzamido-functionalized prolinamides have been prepared and tested as organocatalysts for enantioselective aldol reaction of aldehydes and cyclic ketones in water. In particular, prolinamide derived from achiral ethylene diamine was the best catalyst leading to anti aldols in excellent diastereomeric (up to 98/2) and enantiomeric (up to 99/1) ratios, thereby showing that lateral amide functionalities might be a key issue for facilitating "in water" chemistry. These catalysts are cheaper and easier to prepare than those previously described.
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Affiliation(s)
- Rafael Pedrosa
- Instituto CINQUIMA and Departamento de Química Orgánica, Facultad de Ciencias, Universidad de Valladolid, Dr Mergelina s/n, 47011, Valladolid, Spain.
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Yong FF, Poh CY, Chua GL, Teo YC. Organocatalytic Asymmetricsyn-Selective Direct Aldol Reaction in Ionic Liquid. CHEM LETT 2010. [DOI: 10.1246/cl.2010.490] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Abstract
Asymmetric aldol reactions are a powerful method for the construction of carbon-carbon bonds in an enantioselective fashion. Historically this reaction has been performed in a stoichiometric fashion to control the various aspects of chemo-, diastereo-, regio- and enantioselectivity, however, a more atom economical approach would unite high selectivity with the use of only a catalytic amount of a chiral promoter. This critical review documents the development of direct catalytic asymmetric aldol methodologies, including organocatalytic and metal-based strategies. New methods have improved the reactivity, selectivity and substrate scope of the direct aldol reaction and enabled the synthesis of complex molecular targets (357 references).
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Affiliation(s)
- Barry M Trost
- Department of Chemistry, Stanford University, Stanford, CA 94305-5080, USA.
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Acyclic Amino Acids Catalyzed Direct Asymmetric Aldol Reactions in Aqueous Media Assisted by 2,4-Dinitrophenol. Catal Letters 2010. [DOI: 10.1007/s10562-010-0351-y] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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24
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Xu LW, Li L, Shi ZH. Asymmetric Synthesis with Silicon-Based Bulky Amino Organocatalysts. Adv Synth Catal 2010. [DOI: 10.1002/adsc.200900797] [Citation(s) in RCA: 203] [Impact Index Per Article: 14.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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25
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Mase N, Noshiro N, Mokuya A, Takabe K. Effect of Long Chain Fatty Acids on Organocatalytic Aqueous Direct Aldol Reactions. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200900572] [Citation(s) in RCA: 50] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
Organocatalysts have emerged as a third major way of catalyzing a wide variety of reactions, besides metal catalysts and biocatalysts. They have gained tremendous importance because of their green chemistry perspective. The criteria for green chemistry would be largely fulfilled if the major component of the reaction mixture, i.e. the solvent, is water which is a suitable solvent in various biosynthetic reactions. In this feature article we have described reactions promoted by organocatalysts in a large excess of water, without any organic solvent or excess of any reactant. We have also explained the structural features required for organocatalysts to work well in aqueous media.
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Affiliation(s)
- Monika Raj
- Department of Chemistry, Indian Institute of Technology, Kanpur 208016, India
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Ma X, Da CS, Yi L, Jia YN, Guo QP, Che LP, Wu FC, Wang JR, Li WP. Highly efficient primary amine organocatalysts for the direct asymmetric aldol reaction in brine. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.05.032] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Paradowska J, Stodulski M, Mlynarski J. Catalysts Based on Amino Acids for Asymmetric Reactions in Water. Angew Chem Int Ed Engl 2009; 48:4288-97. [DOI: 10.1002/anie.200802038] [Citation(s) in RCA: 205] [Impact Index Per Article: 13.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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30
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Paradowska J, Stodulski M, Mlynarski J. Aminosäuren als Katalysatoren für asymmetrische Umsetzungen in Wasser. Angew Chem Int Ed Engl 2009. [DOI: 10.1002/ange.200802038] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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31
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Jia YN, Wu FC, Ma X, Zhu GJ, Da CS. Highly efficient prolinamide-based organocatalysts for the direct asymmetric aldol reaction in brine. Tetrahedron Lett 2009. [DOI: 10.1016/j.tetlet.2009.04.013] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Vishnumaya MR, Singh VK. Highly Efficient Small Organic Molecules for Enantioselective Direct Aldol Reaction in Organic and Aqueous Media. J Org Chem 2009; 74:4289-97. [DOI: 10.1021/jo900548f] [Citation(s) in RCA: 113] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
| | - Vinod K. Singh
- Department of Chemistry, Indian Institute of Technology, Kanpur 208 016, India
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Tzeng ZH, Chen HY, Reddy RJ, Huang CT, Chen K. Highly diastereo- and enantioselective direct aldol reactions promoted by water-compatible organocatalysts bearing a pyrrolidinyl-camphor structural scaffold. Tetrahedron 2009. [DOI: 10.1016/j.tet.2009.02.022] [Citation(s) in RCA: 57] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Da CS, Che LP, Guo QP, Wu FC, Xiao Ma, Jia YN. 2,4-Dinitrophenol as an Effective Cocatalyst: Greatly Improving the Activities and Enantioselectivities of Primary Amine Organocatalysts for Asymmetric Aldol Reactions. J Org Chem 2009; 74:2541-6. [DOI: 10.1021/jo802758b] [Citation(s) in RCA: 80] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Chao-Shan Da
- Institute of Biochemistry & Molecular Biology, School of Life Sciences, State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Li-Ping Che
- Institute of Biochemistry & Molecular Biology, School of Life Sciences, State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Qi-Peng Guo
- Institute of Biochemistry & Molecular Biology, School of Life Sciences, State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Feng-Chun Wu
- Institute of Biochemistry & Molecular Biology, School of Life Sciences, State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Xiao Ma
- Institute of Biochemistry & Molecular Biology, School of Life Sciences, State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
| | - Ya-Ning Jia
- Institute of Biochemistry & Molecular Biology, School of Life Sciences, State Key Laboratory of Applied Organic Chemistry, Lanzhou University, Lanzhou 730000, China
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Hydroxy-α-amino acids modified by ionic liquid moieties: recoverable organocatalysts for asymmetric aldol reactions in the presence of water. Tetrahedron 2009. [DOI: 10.1016/j.tet.2008.12.045] [Citation(s) in RCA: 58] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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37
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The Ion Tag Strategy as a Route to Highly Efficient Organocatalysts for the Direct Asymmetric Aldol Reaction. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200800608] [Citation(s) in RCA: 89] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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38
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Zheng C, Wu Y, Wang X, Zhao G. Highly Enantioselective Organocatalyzed Construction of Quaternary Carbon Centers via Cross-Aldol Reaction of Ketones in Water. Adv Synth Catal 2008. [DOI: 10.1002/adsc.200800248] [Citation(s) in RCA: 69] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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Abstract
After an initial period of validating asymmetric organocatalysis by using a wide range of important model reactions that constitute the essential tools of organic synthesis, the time has now been reached when organocatalysis can be used to address specific issues and solve pending problems of stereochemical relevance. This Review deals with selected studies reported in 2006 and the first half of 2007, and is intended to highlight four main aspects that may be taken as testimony of the present status and prospective of organocatalysis: a) chemical efficiency; b) discovery of new substrate combinations to give new asymmetric syntheses; c) development of new catalysts for specific purposes by using mechanistic findings; and d) applications of organocatalytic reactions in the asymmetric total synthesis of target natural products and known compounds of biological and pharmaceutical relevance.
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Affiliation(s)
- Alessandro Dondoni
- Dipartimento di Chimica, Università di Ferrara, Via L. Borsari 46-44100 Ferrara, Italy.
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Teo YC, Chua GL. A recyclable non-immobilized siloxy serine organocatalyst for the asymmetric direct aldol reaction. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2008.04.159] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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42
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Siyutkin DE, Kucherenko AS, Struchkova MI, Zlotin SG. A novel (S)-proline-modified task-specific chiral ionic liquid—an amphiphilic recoverable catalyst for direct asymmetric aldol reactions in water. Tetrahedron Lett 2008. [DOI: 10.1016/j.tetlet.2007.12.044] [Citation(s) in RCA: 107] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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43
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Direct asymmetric three-component Mannich reactions catalyzed by a siloxy serine organocatalyst in water. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.tetasy.2007.12.011] [Citation(s) in RCA: 60] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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44
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Puleo GL, Iuliano A. Methyl 12-[d-prolinoylamino]cholate as a versatile organocatalyst for the asymmetric aldol reaction of cyclic ketones. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.tetasy.2007.11.023] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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45
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Guillena G, Nájera C, Ramón DJ. Enantioselective direct aldol reaction: the blossoming of modern organocatalysis. ACTA ACUST UNITED AC 2007. [DOI: 10.1016/j.tetasy.2007.09.025] [Citation(s) in RCA: 311] [Impact Index Per Article: 18.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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