1
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Catalytic Efficiency of Primary α-Amino Amides as Multifunctional Organocatalysts in Recent Asymmetric Organic Transformations. Catalysts 2022. [DOI: 10.3390/catal12121674] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
Chiral primary α-amino amides, consisting of an adjacent enamine bonding site (Bronsted base site), a hydrogen bonding site (Bronsted acid site), and flexible bulky substituent groups to modify the steric factor, are proving to be extremely valuable bifunctional organocatalysts for a wide range of asymmetric organic transformations. Primary α-amino amides are less expensive alternatives to other primary amino organocatalysts, such as chiral diamines and cinchona-alkaloid-derived primary amines, as they are easy to synthesize, air-stable, and allow for the incorporation of a variety of functional groups. In recent years, we have demonstrated the catalytic use of simple primary α-amino amides and their derivatives as organocatalysts for the aldol reaction, Strecker reaction, Michael tandem reaction, allylation of aldehydes, reduction of N-Aryl mines, opening of epoxides, hydrosilylation, asymmetric hydrogen transfer, and N-specific nitrosobenzene reaction with aldehydes.
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2
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Babkova M, Wilhelm R. On the Influence of a Camphor‐based 1,3‐Diamine Fragment in a Proline‐Based Organocatalyst. ChemistrySelect 2022. [DOI: 10.1002/slct.202201313] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Mariia Babkova
- Institute of Organic Chemistry Clausthal University of Technology Leibnizstr. 6 38678 Clausthal-Zellerfeld Germany
| | - Rene Wilhelm
- Institute of Organic Chemistry Clausthal University of Technology Leibnizstr. 6 38678 Clausthal-Zellerfeld Germany
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3
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Cmelova P, Sramel P, Zahradnikova B, Modrocka V, Szabados H, Meciarova M, Sebesta R. Pro‐Pro Dipeptide‐Thiourea Organocatalyst in the Mannich Reaction Between α‐Imino Esters and Pyruvates. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200106] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Patricia Cmelova
- Comenius University in Bratislava Faculty of Natural Sciences: Univerzita Komenskeho v Bratislave Prirodovedecka fakulta Organic chemistry SLOVAKIA
| | - Peter Sramel
- Comenius University in Bratislava Faculty of Natural Sciences: Univerzita Komenskeho v Bratislave Prirodovedecka fakulta Organic chemistry SLOVAKIA
| | - Barbora Zahradnikova
- Comenius University in Bratislava Faculty of Natural Sciences: Univerzita Komenskeho v Bratislave Prirodovedecka fakulta Organic chemistry SLOVAKIA
| | - Viktoria Modrocka
- Comenius University in Bratislava Faculty of Natural Sciences: Univerzita Komenskeho v Bratislave Prirodovedecka fakulta Organic chemistry SLOVAKIA
| | - Henrich Szabados
- Comenius University in Bratislava Faculty of Natural Sciences: Univerzita Komenskeho v Bratislave Prirodovedecka fakulta Organic chemistry SLOVAKIA
| | - Maria Meciarova
- Comenius University in Bratislava Faculty of Natural Sciences: Univerzita Komenskeho v Bratislave Prirodovedecka fakulta Organic chemistry SLOVAKIA
| | - Radovan Sebesta
- Comenius University FNS: Univerzita Komenskeho v Bratislave Prirodovedecka fakulta Organic chemistry Mlynska dolina, Ilkovicova 6 84215 Bratislava SLOVAKIA
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4
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Coomber C, Diorazio L. N‐Alkylation of α‐Amino Esters and Amides via Hydrogen Borrowing. European J Org Chem 2022. [DOI: 10.1002/ejoc.202200152] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Charlotte Coomber
- AstraZeneca Chemical Development Pharmaceutical Technology&DevelopmentOperationsAstraZeneca SK10 2NA Macclesfield UNITED KINGDOM
| | - Louis Diorazio
- AstraZeneca UK Ltd Chemical Development Charter Way Macclesfield UNITED KINGDOM
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5
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Thiyagarajan R, Begum Z, Seki C, Okuyama Y, Kwon E, Uwai K, Tokiwa M, Tokiwa S, Takeshita M, Nakano H. New small γ-turn type N-primary amino terminal tripeptide organocatalyst for solvent-free asymmetric aldol reaction of various ketones with aldehydes. RSC Adv 2021; 11:38925-38932. [PMID: 35493209 PMCID: PMC9044195 DOI: 10.1039/d1ra08635a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Accepted: 11/30/2021] [Indexed: 01/18/2023] Open
Abstract
New small γ-turn type N-primary amino terminal tripeptides were synthesized and their functionality as an organocatalyst was examined in the asymmetric aldol reaction of various ketones with different aromatic aldehydes under solvent-free neat conditions to afford the desired chiral anti-aldol products in good to excellent chemical yields, diastereoselectivities and enantioselectivities (up to 99%, up to syn : anti/13 : 87 dr, up to 99% ee).
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Affiliation(s)
- Rajkumar Thiyagarajan
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology 27-1 Mizumoto-cho Muroran 050-8585 Japan
| | - Zubeda Begum
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology 27-1 Mizumoto-cho Muroran 050-8585 Japan
| | - Chigusa Seki
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology 27-1 Mizumoto-cho Muroran 050-8585 Japan
| | - Yuko Okuyama
- Tohoku Medical and Pharmaceutical University 4-4-1 Komatsushima Aoba-Ku Sendai 981-8558 Japan
| | - Eunsang Kwon
- Research and Analytical Center for Giant Molecules, Graduate School of Sciences,Tohoku Medical and Pharmaceutical University 4-4-1 Komatsushima Aoba-Ku Sendai 981-8558 Japan
| | - Koji Uwai
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology 27-1 Mizumoto-cho Muroran 050-8585 Japan
| | - Michio Tokiwa
- Tokiwakai Group 62 Numajiri Tsuduri-Chou Uchigo Iwaki 973-8053 Japan
| | - Suguru Tokiwa
- Tokiwakai Group 62 Numajiri Tsuduri-Chou Uchigo Iwaki 973-8053 Japan
| | | | - Hiroto Nakano
- Division of Sustainable and Environmental Engineering, Graduate School of Engineering, Muroran Institute of Technology 27-1 Mizumoto-cho Muroran 050-8585 Japan
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6
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Juaristi E. Recent developments in next generation (S)-proline-derived chiral organocatalysts. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132143] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/09/2023]
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7
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Abstract
Symmetric organic compounds are generally obtained inexpensively, and therefore they can be attractive building blocks for the total synthesis of various pharmaceuticals and natural products. The drawback is that discriminating the identical functional groups in the symmetric compounds is difficult. Water is the most environmentally benign and inexpensive solvent. However, successful organic reactions in water are rather limited due to the hydrophobicity of organic compounds in general. Therefore, desymmetrization reactions in aqueous media are expected to offer versatile strategies for the synthesis of a variety of significant organic compounds. This review focuses on the recent progress of desymmetrization reactions of symmetric organic compounds in aqueous media without utilizing enzymes.
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8
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Čmelová P, Vargová D, Šebesta R. Hybrid Peptide-Thiourea Catalyst for Asymmetric Michael Additions of Aldehydes to Heterocyclic Nitroalkenes. J Org Chem 2021; 86:581-592. [PMID: 33258590 DOI: 10.1021/acs.joc.0c02251] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Bifunctional organocatalysis combining covalent and noncovalent activation is presented. The hybrid peptide-thiourea catalyst features a N-terminal proline moiety for aldehyde activation and a thiourea unit for electrophile activation. This catalyst effectively promotes asymmetric Michael additions of aldehydes to challenging but biologically relevant heterocycle-containing nitroalkenes. The catalyst can be used under solvent-free conditions. Spectroscopic and density functional theory studies elucidate the catalyst structure and mode of action.
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Affiliation(s)
- Patrícia Čmelová
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
| | - Denisa Vargová
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
| | - Radovan Šebesta
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynská dolina, Ilkovičova 6, 842 15 Bratislava, Slovakia
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9
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Huelgas G, Somanathan R, Hernández Pérez JM, Rojas Cabrera H, de la Higuera Macías M, Domínguez-Huerta A, Sabala R, Anaya de Parrodi C. Homochiral bifunctional L-prolinamide- and L-bis-prolinamide-catalyzed asymmetric aldol reactions performed in wet solvent-free conditions. Chirality 2020; 33:22-36. [PMID: 33232537 DOI: 10.1002/chir.23283] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2020] [Revised: 09/25/2020] [Accepted: 10/05/2020] [Indexed: 01/20/2023]
Abstract
In this study, the novel bifunctional homochiral thiourea-L-prolinamides 1-4, tertiary amino-L-prolinamide 5, and bis-L-prolinamides 6 and 7 were prepared from enantiomerically pure (11R,12R)-11,12-diamino-9,10-dihydro-9,10-ethanoanthracene 8 and (11S,12S)-11,12-diamino-9,10-dihydro-9,10-ethanoanthracene ent-8. Highly enantioselective and diastereoselective aldolic intermolecular reactions (up to 95% enantiomeric excess, 93:7 anti/syn) between aliphatic ketones (20 equiv) and a range of aromatic aldehydes (1 equiv) were successfully carried out in the presence of water (10 equiv) and monochloroacetic acid (10 mol%), solvent-free conditions, at room temperature over 24 h using organocatalysts 1-7 (5 mol%). Stereoselective induction using density functional theory-based methods was consistent with the experimental data.
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Affiliation(s)
- Gabriela Huelgas
- Departamento de Ciencias Químico Biológicas, Universidad de las Americas Puebla, Cholula, Puebla, Mexico
| | - Ratnasamy Somanathan
- Centro de Graduados e Investigación en Química, Tecnológico Nacional de México/Instituto Tecnológico de Tijuana, Tijuana, Baja California, Mexico
| | | | - Haydee Rojas Cabrera
- Departamento de Ciencias Químico Biológicas, Universidad de las Americas Puebla, Cholula, Puebla, Mexico
| | | | - Alejandra Domínguez-Huerta
- Departamento de Ciencias Químico Biológicas, Universidad de las Americas Puebla, Cholula, Puebla, Mexico
| | - Rocío Sabala
- Departamento de Ciencias Químico Biológicas, Universidad de las Americas Puebla, Cholula, Puebla, Mexico
| | - Cecilia Anaya de Parrodi
- Departamento de Ciencias Químico Biológicas, Universidad de las Americas Puebla, Cholula, Puebla, Mexico
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10
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Metrano AJ, Chinn AJ, Shugrue CR, Stone EA, Kim B, Miller SJ. Asymmetric Catalysis Mediated by Synthetic Peptides, Version 2.0: Expansion of Scope and Mechanisms. Chem Rev 2020; 120:11479-11615. [PMID: 32969640 PMCID: PMC8006536 DOI: 10.1021/acs.chemrev.0c00523] [Citation(s) in RCA: 98] [Impact Index Per Article: 24.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Low molecular weight synthetic peptides have been demonstrated to be effective catalysts for an increasingly wide array of asymmetric transformations. In many cases, these peptide-based catalysts have enabled novel multifunctional substrate activation modes and unprecedented selectivity manifolds. These features, along with their ease of preparation, modular and tunable structures, and often biomimetic attributes make peptides well-suited as chiral catalysts and of broad interest. Many examples of peptide-catalyzed asymmetric reactions have appeared in the literature since the last survey of this broad field in Chemical Reviews (Chem. Rev. 2007, 107, 5759-5812). The overarching goal of this new Review is to provide a comprehensive account of the numerous advances in the field. As a corollary to this goal, we survey the many different types of catalytic reactions, ranging from acylation to C-C bond formation, in which peptides have been successfully employed. In so doing, we devote significant discussion to the structural and mechanistic aspects of these reactions that are perhaps specific to peptide-based catalysts and their interactions with substrates and/or reagents.
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Affiliation(s)
- Anthony J. Metrano
- AstraZeneca Oncology R&D, 35 Gatehouse Dr., Waltham, MA 02451, United States
| | - Alex J. Chinn
- Department of Chemistry, Princeton University, Princeton, NJ 08544, United States
| | - Christopher R. Shugrue
- Department of Chemistry, Massachusetts Institute of Technology, Cambridge, MA 02139, United States
| | - Elizabeth A. Stone
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, CT 06520, United States
| | - Byoungmoo Kim
- Department of Chemistry, Clemson University, Clemson, SC 29634, United States
| | - Scott J. Miller
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, CT 06520, United States
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11
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Félix ARG, Simões PR, Sousa FJ, Serra MES, Murtinho D. Chiral Thiazolidine based Organocatalysts: Synthesis and Application in Asymmetric Aldol Reactions. LETT ORG CHEM 2020. [DOI: 10.2174/2210681209666190807155816] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Several novel chiral organocatalysts derived from thiazolidines containing amide and thioureia
functionalities were synthesized in good yields. These organocatalysts were tested in the asymmetric
aldol reaction of acetone with p-nitrobenzaldehyde. Reaction parameters such as reaction time, catalyst
loading and solvent were optimized. Products with conversions up to 84% and enantiomeric ratios
(er) up to 84.5:15.5 (R:S) were obtained. The effect of several chiral and non-chiral additives on the
reactivity and selectivity of the reaction was also evaluated. The reaction was extended to other aromatic
aldehydes with the best organocatalyst and when p-bromobenzaldehyde was used, an er of
94.5:5.5 (R:S) was obtained.
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Affiliation(s)
- Ana Rita G. Félix
- CQC, Department of Chemistry, University of Coimbra, Coimbra, Portugal
| | - Pedro R.D. Simões
- CQC, Department of Chemistry, University of Coimbra, Coimbra, Portugal
| | | | | | - Dina Murtinho
- CQC, Department of Chemistry, University of Coimbra, Coimbra, Portugal
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12
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Kui T, Guillen F. Histidine-based salt as an ionic tag for proline: application in enantioselective cross aldol reaction in ionic liquids. SYNTHETIC COMMUN 2020. [DOI: 10.1080/00397911.2020.1745241] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- Tony Kui
- SPCMIB, UMR 5068 CNRS-Université Paul Sabatier-Toulouse III, Toulouse, France
| | - Frédéric Guillen
- SPCMIB, UMR 5068 CNRS-Université Paul Sabatier-Toulouse III, Toulouse, France
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13
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14
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Mondal A, Bhowmick KC. Asymmetric Direct Aldol Reaction Catalyzed by (1R, 2R)-(+)-1, 2- Diammonium Cyclohexane-L-tartrate in Water. CURRENT ORGANOCATALYSIS 2019. [DOI: 10.2174/2213337206666181227151140] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
A cheap and commercially available organocatalyst, (1R, 2R)-(+)-1, 2-
diammonium cyclohexane-L-tartrate 1 was applied in direct aldol reaction in water. The organocatalyst
1 afforded aldol products from cyclohexanone and substituted aromatic aldehydes with high
yield (up to 90%) and good stereoselectivity (up to 99% ee and up to 11.5:1 dr) in large volume of
water (10 ml).
Methods:
The same aldol reaction when carried out in the presence of more expensive organocatalyst
e.g. (1R, 2R)-(+)-1,2-diaminocyclohexane and 1,6-hexanediaoic acid as acid additive furnished the
aldol products with only 20% yield, 2:1 anti/syn ratio and 92% ee.
Results and Conclusion:
In summary, we have applied a reasonably cheap and commercially available
organocatalyst 1 for highly enantioselective direct aldol reaction in water at room temperature.
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Affiliation(s)
- Anirban Mondal
- Division of Organic Synthesis, Department of Chemistry, Visva-Bharati (A Central University), Santiniketan-731 235, West Bengal, India
| | - Kartick Chandra Bhowmick
- Division of Organic Synthesis, Department of Chemistry, Visva-Bharati (A Central University), Santiniketan-731 235, West Bengal, India
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15
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Firouzi-Haji R, Maleki A. L-Proline-Functionalized Fe3
O4
Nanoparticles as an Efficient Nanomagnetic Organocatalyst for Highly Stereoselective One-Pot Two-Step Tandem Synthesis of Substituted Cyclopropanes. ChemistrySelect 2019. [DOI: 10.1002/slct.201802608] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Razieh Firouzi-Haji
- Catalysts and Organic Synthesis Research Laboratory; Department of Chemistry; Iran University of Science and Technology; Tehran 16846-13114 Iran
| | - Ali Maleki
- Catalysts and Organic Synthesis Research Laboratory; Department of Chemistry; Iran University of Science and Technology; Tehran 16846-13114 Iran
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16
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Unnatural tripeptide as highly enantioselective organocatalyst for asymmetric aldol reaction of isatins. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2018.12.049] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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17
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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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18
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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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19
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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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20
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Poláčková V, Čmelová P, Górová R, Šebesta R. Peptide-catalyzed stereoselective Michael addition of aldehydes and ketones to heterocyclic nitroalkenes. MONATSHEFTE FUR CHEMIE 2017. [DOI: 10.1007/s00706-017-2126-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
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21
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22
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Yorulmaz T, Aydogan F, Yolacan C. New and effective proline-based catalysts for asymmetric aldol reaction in water. SYNTHETIC COMMUN 2016. [DOI: 10.1080/00397911.2016.1252988] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Tugba Yorulmaz
- Department of Chemistry, Yildiz Technical University, Istanbul, Turkey
| | - Feray Aydogan
- Department of Chemistry, Yildiz Technical University, Istanbul, Turkey
| | - Cigdem Yolacan
- Department of Chemistry, Yildiz Technical University, Istanbul, Turkey
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23
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Ashokkumar V, Chithiraikumar C, Siva A. Binaphthyl-based chiral bifunctional organocatalysts for water mediated asymmetric List–Lerner–Barbas aldol reactions. Org Biomol Chem 2016; 14:9021-32. [DOI: 10.1039/c6ob01558a] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Binaphthyl-based organocatalysts were synthesized and successfully applied to the asymmetric List–Lerner–Barbas aldol reaction in water medium. These organocatalysts were found to be effective catalysts for the reactions of ketones with different aldehydes to give aldol products with higher yield and ee's.
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Affiliation(s)
- Veeramanoharan Ashokkumar
- Supramolecular and Organometallic Chemistry Lab
- School of Chemistry
- Madurai Kamaraj University
- Madurai-625 021
- India
| | - Chinnadurai Chithiraikumar
- Supramolecular and Organometallic Chemistry Lab
- School of Chemistry
- Madurai Kamaraj University
- Madurai-625 021
- India
| | - Ayyanar Siva
- Supramolecular and Organometallic Chemistry Lab
- School of Chemistry
- Madurai Kamaraj University
- Madurai-625 021
- India
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24
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Water: the most versatile and nature’s friendly media in asymmetric organocatalyzed direct aldol reactions. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tetasy.2015.09.009] [Citation(s) in RCA: 41] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
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25
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Kumar TP, Shekhar RC, Sunder KS, Vadaparthi R. Myrtanyl-prolinamide: a new chiral organocatalyst for stereoselective aldol reactions. ACTA ACUST UNITED AC 2015. [DOI: 10.1016/j.tetasy.2015.03.009] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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26
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Hu XM, Zhang DX, Zhang SY, Wang PA. Highly modular dipeptide-like organocatalysts for direct asymmetric aldol reactions in brine. RSC Adv 2015. [DOI: 10.1039/c5ra07019h] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023] Open
Abstract
The dipeptide-like organocatalysts have been developed for asymmetric aldol reactions in brine to achieve high yields and enantioselectivities with 1 mol% catalyst-loading.
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Affiliation(s)
- Xiao-Mu Hu
- Department of Medicinal Chemistry
- School of Pharmacy
- The Fourth Military Medical University
- Xi'an
- P. R. China
| | - Dong-Xu Zhang
- Department of Medicinal Chemistry
- School of Pharmacy
- The Fourth Military Medical University
- Xi'an
- P. R. China
| | - Sheng-Yong Zhang
- Department of Medicinal Chemistry
- School of Pharmacy
- The Fourth Military Medical University
- Xi'an
- P. R. China
| | - Ping-An Wang
- Department of Medicinal Chemistry
- School of Pharmacy
- The Fourth Military Medical University
- Xi'an
- P. R. China
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