1
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Seitz A, Wende RC, Schreiner PR. Site-Selective Acylation of Pyranosides with Immobilized Oligopeptide Catalysts in Flow. Chemistry 2022; 29:e202203002. [PMID: 36538197 DOI: 10.1002/chem.202203002] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/26/2022] [Revised: 11/29/2022] [Accepted: 12/20/2022] [Indexed: 12/24/2022]
Abstract
We report the site-selective acetylation of partially protected monosaccharides using immobilized oligopeptide catalysts, which are readily accessible via solid-phase peptide synthesis. The catalysts are able to invert the intrinsic selectivity, which was determined using N-methylimidazole, for a variety of pyranosides. We demonstrate that the catalysts are stable for multiple reaction cycles and can be easily reused after separation from the reaction solution. The catalysts can also be used in flow without loss of reactivity and selectivity.
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Affiliation(s)
- Alexander Seitz
- Institute of Organic Chemistry, Justus Liebig University Giessen, Heinrich-Buff-Ring 17, 35392, Giessen, Germany
| | - Raffael C Wende
- Institute of Organic Chemistry, Justus Liebig University Giessen, Heinrich-Buff-Ring 17, 35392, Giessen, Germany
| | - Peter R Schreiner
- Institute of Organic Chemistry, Justus Liebig University Giessen, Heinrich-Buff-Ring 17, 35392, Giessen, Germany
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2
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García-Monzón I, Borges-González J, Martín T. Solid‐Supported Tetrahydropyran‐Based Hybrid Dipeptide Catalysts for Michael Addition of Aldehydes to Nitrostyrenes. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200477] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
| | | | - Tomás Martín
- Instituto de Productos Naturales y Agrobiología SPAIN
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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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Gorde AB, Ansari A, Ramapanicker R. Asymmetric Michael addition reactions of aldehydes to β-nitrostyrenes catalyzed by (S)–N-(D-prolyl-L-prolyl)-1 -triflicamido-3 -phenylpropan-2-amine. Tetrahedron 2021. [DOI: 10.1016/j.tet.2021.132095] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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5
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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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6
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Möhler JS, Schnitzer T, Wennemers H. Amine Catalysis with Substrates Bearing N-Heterocyclic Moieties Enabled by Control over the Enamine Pyramidalization Direction. Chemistry 2020; 26:15623-15628. [PMID: 32573875 DOI: 10.1002/chem.202002966] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Indexed: 02/06/2023]
Abstract
Stereoselective organocatalytic C-C bond formations that tolerate N-heterocycles are valuable since these moieties are common motifs in numerous chiral bioactive compounds. Such transformations are, however, challenging since N-heterocyclic moieties can interfere with the catalytic reaction. Here, we present a peptide that catalyzes conjugate addition reactions between aldehydes and nitroolefins bearing a broad range of different N-heterocyclic moieties with basic and/or H-bonding sites in excellent yields and stereoselectivities. Tuning of the pyramidalization direction of the enamine intermediate enabled the high stereoselectivity.
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Affiliation(s)
- Jasper S Möhler
- Laboratory of Organic Chemistry, D-CHAB, ETH Zürich, Vladimir-Prelog-Weg 3, 8093, Zürich, Switzerland
| | - Tobias Schnitzer
- Laboratory of Organic Chemistry, D-CHAB, ETH Zürich, Vladimir-Prelog-Weg 3, 8093, Zürich, Switzerland
| | - Helma Wennemers
- Laboratory of Organic Chemistry, D-CHAB, ETH Zürich, Vladimir-Prelog-Weg 3, 8093, Zürich, Switzerland
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7
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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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8
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Schnitzer T, Wennemers H. Deactivation of Secondary Amine Catalysts via Aldol Reaction-Amine Catalysis under Solvent-Free Conditions. J Org Chem 2020; 85:7633-7640. [PMID: 32329616 DOI: 10.1021/acs.joc.0c00665] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Despite intense interest in amine-catalyzed stereoselective reactions, high catalyst loadings of ≥10 mol % are still common and either due to low reactivity or catalyst deactivation. Yet, few deactivation pathways are well understood. Here, we unraveled the deactivation of secondary amines by undesired aldol reaction. Mechanistic studies with peptide and prolinol silyl ether catalysts showed the generality of this so-far underappreciated catalyst deactivation pathway. The insights enabled conjugate addition reactions between aldehydes and nitroolefins on a multigram scale in the absence of solvent-conditions that are attractive as environmentally benign processes-with excellent product yields and stereoselectivities in the presence of as little as 0.1 mol % of a chemoselective peptidic catalyst.
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Affiliation(s)
- Tobias Schnitzer
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, 8093 Zurich, Switzerland
| | - Helma Wennemers
- Laboratory of Organic Chemistry, ETH Zurich, D-CHAB, Vladimir-Prelog-Weg 3, 8093 Zurich, Switzerland
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9
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Krištofíková D, Modrocká V, Mečiarová M, Šebesta R. Green Asymmetric Organocatalysis. CHEMSUSCHEM 2020; 13:2828-2858. [PMID: 32141177 DOI: 10.1002/cssc.202000137] [Citation(s) in RCA: 72] [Impact Index Per Article: 18.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/15/2020] [Revised: 03/05/2020] [Indexed: 06/10/2023]
Abstract
Asymmetric organocatalysis is becoming one of the main tools for the synthesis of chiral compounds that are needed as medicines, crop protection agents, and other bioactive molecules. It can be effectively combined with various green chemistry methodologies. Intensification techniques, such as ball milling, flow, high pressure, or light, bring not only higher yields, faster reactions, and easier product isolation, but also new reactivities. More sustainable reaction media, such as ionic liquids, deep eutectic solvents, green solvent alternatives, and water, also considerably enhance the sustainability profile of many organocatalytic reactions.
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Affiliation(s)
- Dominika Krištofíková
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynska dolina, Ilkovicova 6, 842 15, Bratislava, Slovakia
| | - Viktória Modrocká
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynska dolina, Ilkovicova 6, 842 15, Bratislava, Slovakia
| | - Mária Mečiarová
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynska dolina, Ilkovicova 6, 842 15, Bratislava, Slovakia
| | - Radovan Šebesta
- Department of Organic Chemistry, Faculty of Natural Sciences, Comenius University in Bratislava, Mlynska dolina, Ilkovicova 6, 842 15, Bratislava, Slovakia
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10
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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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11
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Kozma V, Fülöp F, Szőllősi G. 1,2‐Diamine‐Derived (thio)Phosphoramide Organocatalysts in Asymmetric Michael Additions. Adv Synth Catal 2020. [DOI: 10.1002/adsc.202000335] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Viktória Kozma
- Department of Organic ChemistryUniversity of Szeged 6720 Szeged Dóm tér 8 Hungary
| | - Ferenc Fülöp
- Institute of Pharmaceutical ChemistryUniversity of Szeged 6720 Szeged Eötvös utca 6 Hungary
- MTA-SZTE Stereochemistry Research GroupUniversity of Szeged 6720 Szeged Eötvös utca 6 Hungary
- University of Szeged, Interdisciplinary Excellence CentreInstitute of Pharmaceutical Chemistry 6720 Szeged Eötvös utca 6 Hungary
| | - György Szőllősi
- MTA-SZTE Stereochemistry Research GroupUniversity of Szeged 6720 Szeged Eötvös utca 6 Hungary
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12
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13
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A Resin-Bound Peptoid as a Recyclable Heterogeneous Catalyst for Oxidation Reactions. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901739] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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14
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de la Torre AF, Scatena GS, Valdés O, Rivera DG, Paixão MW. Ugi reaction-derived prolyl peptide catalysts grafted on the renewable polymer polyfurfuryl alcohol for applications in heterogeneous enamine catalysis. Beilstein J Org Chem 2019; 15:1210-1216. [PMID: 31293668 PMCID: PMC6604708 DOI: 10.3762/bjoc.15.118] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2018] [Accepted: 04/29/2019] [Indexed: 01/17/2023] Open
Abstract
The multicomponent synthesis of prolyl pseudo-peptide catalysts using the Ugi reaction with furfurylamines or isocyanides is described. The incorporation of such a polymerizable furan handle enabled the subsequent polymerization of the peptide catalyst with furfuryl alcohol, thus rendering polyfurfuryl alcohol-supported catalysts for applications in heterogeneous enamine catalysis. The utilization of the polymer-supported catalysts in both batch and continuous-flow organocatalytic procedures proved moderate catalytic efficacy and enantioselectivity, but excellent diastereoselectivity in the asymmetric Michael addition of n-butanal to β-nitrostyrene that was used as a model reaction. This work supports the potential of multicomponent reactions towards the assembly of catalysts and their simultaneous functionalization for immobilization.
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Affiliation(s)
- Alexander F de la Torre
- Departamento de Química Orgánica, Facultad de Ciencias Químicas, Universidad de Concepción, Edmundo Larenas 234-interior-Casilla 160-C-Concepción, Chile
| | - Gabriel S Scatena
- Márcio W. Paixão, Departamento de Química, Universidade Federal de São Carlos, São Carlos, SP, 97105-900, Brazil
| | - Oscar Valdés
- Vicerrectoria de Investigación y Postgrado, Universidad Católica del Maule, Talca 3460000, Chile
| | - Daniel G Rivera
- Center for Natural Products Research, Faculty of Chemistry, University of Havana, Zapata y G, 10400, La Habana, Cuba
| | - Márcio W Paixão
- Márcio W. Paixão, Departamento de Química, Universidade Federal de São Carlos, São Carlos, SP, 97105-900, Brazil
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15
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Borges‐González J, García‐Monzón I, Martín T. Conformational Control of Tetrahydropyran‐Based Hybrid Dipeptide Catalysts Improves Activity and Stereoselectivity. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900247] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
Affiliation(s)
- Jorge Borges‐González
- Instituto de Productos Naturales y AgrobiologíaCSIC Francisco Sánchez, 3 38206 La Laguna, Tenerife Spain
- Doctoral and Postgraduate SchoolUniversity of La Laguna
| | - Irma García‐Monzón
- Instituto de Productos Naturales y AgrobiologíaCSIC Francisco Sánchez, 3 38206 La Laguna, Tenerife Spain
- Doctoral and Postgraduate SchoolUniversity of La Laguna
| | - Tomás Martín
- Instituto de Productos Naturales y AgrobiologíaCSIC Francisco Sánchez, 3 38206 La Laguna, Tenerife Spain
- Instituto Universitario de Bio-Orgánica “Antonio González” CIBICANUniversidad de La Laguna, Francisco Sánchez, 2 38206 La Laguna, Tenerife Spain
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16
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Gorde AB, Ramapanicker R. d-Prolyl-2-(trifluoromethylsulfonamidopropyl)pyrrolidine: An Organocatalyst for Asymmetric Michael Addition of Aldehydes to β-Nitroalkenes at Ambient Conditions. J Org Chem 2019; 84:1523-1533. [PMID: 30609351 DOI: 10.1021/acs.joc.8b02945] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Amol B. Gorde
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Ramesh Ramapanicker
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208016, India
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17
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Rigling C, Kisunzu JK, Duschmalé J, Häussinger D, Wiesner M, Ebert MO, Wennemers H. Conformational Properties of a Peptidic Catalyst: Insights from NMR Spectroscopic Studies. J Am Chem Soc 2018; 140:10829-10838. [PMID: 30106584 DOI: 10.1021/jacs.8b05459] [Citation(s) in RCA: 42] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Peptides have become valuable as catalysts for a variety of different reactions, but little is known about the conformational properties of peptidic catalysts. We investigated the conformation of the peptide H-dPro-Pro-Glu-NH2, a highly reactive and stereoselective catalyst for conjugate addition reactions, and the corresponding enamine intermediate in solution by NMR spectroscopy and computational methods. The combination of nuclear Overhauser effects (NOEs), residual dipolar couplings (RDCs), J-couplings, and temperature coefficients revealed that the tripeptide adopts a single predominant conformation in its ground state. The structure is a type I β-turn, which gains stabilization from three hydrogen bonds that are cooperatively formed between all functional groups (secondary amine, carboxylic acid, amides) within the tripeptide. In contrast, the conformation of the enamine intermediate is significantly more flexible. The conformational ensemble of the enamine is still dominated by the β-turn, but the backbone and the side chain of the glutamic acid residue are more dynamic. The key to the switch between rigidity and flexibility of the peptidic catalyst is the CO2H group in the side chain of the glutamic acid residue, which acts as a lid that can open and close. As a result, the peptidic catalyst is able to adapt to the structural requirements of the intermediates and transition states of the catalytic cycle. These insights might explain the robustness and high reactivity of the peptidic catalyst, which exceeds that of other secondary amine-based organocatalysts. The data suggest that a balance between rigidity and flexibility, which is reminiscent of the dynamic nature of enzymes, is beneficial for peptidic catalysts and other synthetic catalysts.
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Affiliation(s)
- Carla Rigling
- Laboratorium für Organische Chemie , ETH Zürich , D-CHAB, Vladimir-Prelog-Weg 3 , 8093 Zürich , Switzerland
| | - Jessica K Kisunzu
- Laboratorium für Organische Chemie , ETH Zürich , D-CHAB, Vladimir-Prelog-Weg 3 , 8093 Zürich , Switzerland
| | - Jörg Duschmalé
- Laboratorium für Organische Chemie , ETH Zürich , D-CHAB, Vladimir-Prelog-Weg 3 , 8093 Zürich , Switzerland.,Department of Chemistry , University of Basel , St. Johanns-Ring 19 , 4056 Basel , Switzerland
| | - Daniel Häussinger
- Department of Chemistry , University of Basel , St. Johanns-Ring 19 , 4056 Basel , Switzerland
| | - Markus Wiesner
- Department of Chemistry , University of Basel , St. Johanns-Ring 19 , 4056 Basel , Switzerland
| | - Marc-Olivier Ebert
- Laboratorium für Organische Chemie , ETH Zürich , D-CHAB, Vladimir-Prelog-Weg 3 , 8093 Zürich , Switzerland
| | - Helma Wennemers
- Laboratorium für Organische Chemie , ETH Zürich , D-CHAB, Vladimir-Prelog-Weg 3 , 8093 Zürich , Switzerland
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18
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Szőllősi G, Kozma V. Design of Heterogeneous Organocatalyst for the Asymmetric Michael Addition of Aldehydes to Maleimides. ChemCatChem 2018. [DOI: 10.1002/cctc.201800919] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- György Szőllősi
- MTA-SZTE Stereochemistry Research Group Dóm tér 8 Szeged 6720 Hungary
| | - Viktória Kozma
- Department of Organic ChemistryUniversity of Szeged Dóm tér 8 Szeged 6720 Hungary
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19
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Szőllősi G, Gombkötő D, Mogyorós AZ, Fülöp F. Surface-Improved Asymmetric Michael Addition Catalyzed by Amino Acids Adsorbed on Laponite. Adv Synth Catal 2018. [DOI: 10.1002/adsc.201701627] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- György Szőllősi
- MTA-SZTE Stereochemistry Research Group; University of Szeged; 6720 Szeged, Dóm tér 8 Hungary
| | - Dániel Gombkötő
- Department of Organic Chemistry; University of Szeged; 6720 Szeged, Dóm tér 8 Hungary
| | - Attila Zsolt Mogyorós
- Department of Organic Chemistry; University of Szeged; 6720 Szeged, Dóm tér 8 Hungary
| | - Ferenc Fülöp
- MTA-SZTE Stereochemistry Research Group; University of Szeged; 6720 Szeged, Dóm tér 8 Hungary
- Institute of Pharmaceutical Chemistry; University of Szeged; 6720 Szeged, Eötvös utca 6 Hungary
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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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Gest AMM, Aguiluz EM, Mays MT, Liu X, Neidhart EK, Witus LS. A colorimetric competitive displacement assay for the evaluation of catalytic peptides. Org Biomol Chem 2017; 15:10160-10163. [PMID: 29182189 DOI: 10.1039/c7ob02032e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
An indicator displacement assay has been adapted to detect the diol products of the aldol reaction between 4-nitrobenzaldehyde and hydroxyacetone in crude reaction mixtures. This provides a rapid colorimetric method of detecting product formation and thus evaluating potential catalysts, which is demonstrated using multiple catalytic peptides.
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Affiliation(s)
- Anneliese M M Gest
- Department of Chemistry, Macalester College, 1600 Grand Ave., Saint Paul, MN 55105, USA.
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22
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Solid supported Hayashi–Jørgensen catalyst as an efficient and recyclable organocatalyst for asymmetric Michael addition reactions. ACTA ACUST UNITED AC 2017. [DOI: 10.1016/j.tetasy.2017.10.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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23
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Cortes-Clerget M, Jover J, Dussart J, Kolodziej E, Monteil M, Migianu-Griffoni E, Gager O, Deschamp J, Lecouvey M. Bifunctional Tripeptide with a Phosphonic Acid as a Brønsted Acid for Michael Addition: Mechanistic Insights. Chemistry 2017; 23:6654-6662. [DOI: 10.1002/chem.201700604] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2017] [Indexed: 01/20/2023]
Affiliation(s)
- Margery Cortes-Clerget
- Sorbonne Paris Cité-Laboratoire CSPBAT-CNRS UMR 7244; Université Paris 13; 1 Rue de Chablis 93000 Bobigny France
| | - Jesús Jover
- Institute of Chemical Research of Catalonia (ICIQ); The Barcelona Institute of Science and Technology; Avgda. Països Catalans, 16 43007 Tarragona Spain
- Departament de Química Inorgànica i Orgànica; Secció de Química Inorgànica; Universitat de Barcelona; Martí i Franquès 1-11 08028 Barcelona Spain
| | - Jade Dussart
- Sorbonne Paris Cité-Laboratoire CSPBAT-CNRS UMR 7244; Université Paris 13; 1 Rue de Chablis 93000 Bobigny France
| | - Emilie Kolodziej
- Université Paris Sud, ICMMO, UMR 8182; 15 Rue Georges Clemenceau 91405 Orsay Cedex France
| | - Maelle Monteil
- Sorbonne Paris Cité-Laboratoire CSPBAT-CNRS UMR 7244; Université Paris 13; 1 Rue de Chablis 93000 Bobigny France
| | - Evelyne Migianu-Griffoni
- Sorbonne Paris Cité-Laboratoire CSPBAT-CNRS UMR 7244; Université Paris 13; 1 Rue de Chablis 93000 Bobigny France
| | - Olivier Gager
- Sorbonne Paris Cité-Laboratoire CSPBAT-CNRS UMR 7244; Université Paris 13; 1 Rue de Chablis 93000 Bobigny France
| | - Julia Deschamp
- Sorbonne Paris Cité-Laboratoire CSPBAT-CNRS UMR 7244; Université Paris 13; 1 Rue de Chablis 93000 Bobigny France
| | - Marc Lecouvey
- Sorbonne Paris Cité-Laboratoire CSPBAT-CNRS UMR 7244; Université Paris 13; 1 Rue de Chablis 93000 Bobigny France
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24
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Grünenfelder CE, Kisunzu JK, Trapp N, Kastl R, Wennemers H. Crystal structures of peptidic catalysts of the H-d
Pro-Pro-Xaa type. Biopolymers 2017; 108. [DOI: 10.1002/bip.22912] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2016] [Revised: 06/27/2016] [Accepted: 07/04/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Claudio E. Grünenfelder
- Laboratory of Organic Chemistry, D-CHAB, ETH Zürich; Vladimir-Prelog-Weg 3 CH-8093 Zürich Switzerland
| | - Jessica K. Kisunzu
- Laboratory of Organic Chemistry, D-CHAB, ETH Zürich; Vladimir-Prelog-Weg 3 CH-8093 Zürich Switzerland
| | - Nils Trapp
- Laboratory of Organic Chemistry, D-CHAB, ETH Zürich; Vladimir-Prelog-Weg 3 CH-8093 Zürich Switzerland
| | - Robert Kastl
- Laboratory of Organic Chemistry, D-CHAB, ETH Zürich; Vladimir-Prelog-Weg 3 CH-8093 Zürich Switzerland
| | - Helma Wennemers
- Laboratory of Organic Chemistry, D-CHAB, ETH Zürich; Vladimir-Prelog-Weg 3 CH-8093 Zürich Switzerland
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25
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Borges-González J, Feher-Voelger A, Crisóstomo FP, Morales EQ, Martín T. Tetrahydropyran-Based Hybrid Dipeptides as Asymmetric Catalysts for Michael Addition of Aldehydes to β-Nitrostyrenes. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201601193] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Jorge Borges-González
- Instituto de Productos Naturales y Agrobiología-CSIC; Avda. Astrofísico Francisco Sánchez, 3 38206 La Laguna, S/C de Tenerife Spain
| | - Andrés Feher-Voelger
- Instituto de Productos Naturales y Agrobiología-CSIC; Avda. Astrofísico Francisco Sánchez, 3 38206 La Laguna, S/C de Tenerife Spain
| | - Fernando Pinacho Crisóstomo
- Instituto de Productos Naturales y Agrobiología-CSIC; Avda. Astrofísico Francisco Sánchez, 3 38206 La Laguna, S/C de Tenerife Spain
- Instituto Universitario de Bio-Orgánica “Antonio González”, CIBICAN; Avda. Astrofísico Francisco Sánchez, 2 38206 La Laguna, S/C de Tenerife Spain
| | - Ezequiel Q. Morales
- Instituto de Productos Naturales y Agrobiología-CSIC; Avda. Astrofísico Francisco Sánchez, 3 38206 La Laguna, S/C de Tenerife Spain
| | - Tomás Martín
- Instituto de Productos Naturales y Agrobiología-CSIC; Avda. Astrofísico Francisco Sánchez, 3 38206 La Laguna, S/C de Tenerife Spain
- Instituto Universitario de Bio-Orgánica “Antonio González”, CIBICAN; Avda. Astrofísico Francisco Sánchez, 2 38206 La Laguna, S/C de Tenerife Spain
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26
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Ionic liquid supported 4-HO-Pro-Val derived organocatalysts for asymmetric aldol reactions in the presence of water. MENDELEEV COMMUNICATIONS 2016. [DOI: 10.1016/j.mencom.2016.09.007] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
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27
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Isenegger PG, Pfaltz A. Mass Spectrometric Back Reaction Screening of Quasi-Enantiomeric Products as a Mechanistic Tool. CHEM REC 2016; 16:2534-2543. [PMID: 27417883 DOI: 10.1002/tcr.201600072] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/13/2016] [Indexed: 11/12/2022]
Abstract
In this account, we discuss a mass spectrometric method that enables unambiguous identification of intermediates involved in the enantioselective step of a catalytic cycle. This method, which we originally developed for rapid evaluation of chiral catalysts, is based on monitoring the back reaction of mass-labeled quasi-enantiomeric products by ESI-MS. In this way, the intrinsic enantioselectivity of a chiral catalyst can be determined directly by quantification of catalytically relevant intermediates. By comparing the results from the forward and back reaction, direct evidence for the involvement of a catalytic intermediate in the enantioselective step can be obtained. In addition, insights about the energy profile of the catalytic cycle may be gained. The potential of back reaction screening as a mechanistic tool is demonstrated for organocatalytic aldol reactions, 1,4-additions of aldehydes to nitroolefins, Diels-Alder reactions, Michael additions, and Morita-Baylis-Hillman reactions.
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Affiliation(s)
- Patrick G Isenegger
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland
| | - Andreas Pfaltz
- Department of Chemistry, University of Basel, St. Johanns-Ring 19, 4056, Basel, Switzerland
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28
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Jumde RP, Mandoli A. Long-Lived Polymer-Supported Dimeric Cinchona Alkaloid Organocatalyst in the Asymmetric α-Amination of 2-Oxindoles. ACS Catal 2016. [DOI: 10.1021/acscatal.6b01141] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Affiliation(s)
- Ravindra P. Jumde
- Dipartimento
di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi
13, 56124 Pisa, Italy
- ISTM-CNR, Via C. Golgi
19, 20133 Milano, Italy
| | - Alessandro Mandoli
- Dipartimento
di Chimica e Chimica Industriale, Università di Pisa, Via G. Moruzzi
13, 56124 Pisa, Italy
- ISTM-CNR, Via C. Golgi
19, 20133 Milano, Italy
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29
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Cortes-Clerget M, Gager O, Monteil M, Pirat JL, Migianu-Griffoni E, Deschamp J, Lecouvey M. Novel Easily Recyclable Bifunctional Phosphonic Acid Carrying Tripeptides for the Stereoselective Michael Addition of Aldehydes with Nitroalkenes. Adv Synth Catal 2015. [DOI: 10.1002/adsc.201500794] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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30
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Synthesis and evaluation of (S)-proline-containing dipeptidic organocatalysts bound to MBHA resin in asymmetric aldol reactions. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.09.062] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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31
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Zheng Y, Cleaveland J, Richardson D, Yuan Y. An Organocatalysis Based Carbocyclic Spiroindoline Synthesis Enables Facile Structure-Activity Relationship (SAR) Study at C2 Position. Org Lett 2015; 17:4240-3. [PMID: 26273894 DOI: 10.1021/acs.orglett.5b02031] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
An asymmetric synthesis of carbocyclic spiroindoline by sequential Michael reaction and [3 + 2]-cycloaddition is described. This protocol demonstrates excellent enantio- and diastereoselectivity with broad functional group tolerance. A diverse range of spiroindolines were prepared by this approach, and the products served as ideal substrates for C2 derivatization.
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Affiliation(s)
- Yongsheng Zheng
- Department of Chemistry, University of Central Florida , Orlando, Florida 32816, United States
| | - Jacob Cleaveland
- Department of Chemistry, University of Central Florida , Orlando, Florida 32816, United States
| | - David Richardson
- Department of Chemistry, University of Central Florida , Orlando, Florida 32816, United States
| | - Yu Yuan
- Department of Chemistry, University of Central Florida , Orlando, Florida 32816, United States
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32
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Rodríguez-Escrich C, Pericàs MA. Organocatalysis on Tap: Enantioselective Continuous Flow Processes Mediated by Solid-Supported Chiral Organocatalysts. European J Org Chem 2015. [DOI: 10.1002/ejoc.201403042] [Citation(s) in RCA: 99] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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33
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Xia AB, Zhang C, Zhang YP, Guo YJ, Zhang XL, Li ZB, Xu DQ. Jørgensen–Hayashi catalysts supported on poly(ethylene glycol)s as highly efficient and reusable organocatalysts for the enamine-catalyzed asymmetric Michael reaction. Org Biomol Chem 2015; 13:9593-9. [DOI: 10.1039/c5ob01442e] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A new kind of recyclable and reusable PEG-supported Jørgensen–Hayashi catalyst is synthesized for the first time and proven to be efficient for the enamine-catalyzed asymmetric Michael reaction.
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Affiliation(s)
- Ai-Bao Xia
- Catalytic Hydrogenation Research Centre
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- Zhejiang University of Technology
- Hangzhou
- China
| | - Can Zhang
- Catalytic Hydrogenation Research Centre
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- Zhejiang University of Technology
- Hangzhou
- China
| | - Yan-Peng Zhang
- Catalytic Hydrogenation Research Centre
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- Zhejiang University of Technology
- Hangzhou
- China
| | - Yan-Jun Guo
- Catalytic Hydrogenation Research Centre
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- Zhejiang University of Technology
- Hangzhou
- China
| | - Xiao-Long Zhang
- Catalytic Hydrogenation Research Centre
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- Zhejiang University of Technology
- Hangzhou
- China
| | - Zhao-Bo Li
- Catalytic Hydrogenation Research Centre
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- Zhejiang University of Technology
- Hangzhou
- China
| | - Dan-Qian Xu
- Catalytic Hydrogenation Research Centre
- State Key Laboratory Breeding Base of Green Chemistry-Synthesis Technology
- Zhejiang University of Technology
- Hangzhou
- China
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34
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Nehlig E, Motte L, Guénin E. Magnetic nano-organocatalysts: impact of surface functionalization on catalytic activity. RSC Adv 2015. [DOI: 10.1039/c5ra20644h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Nano-organocatalysts were synthesized using controlled click chemistry and studied in aldolization and Michael addition reactions. It was shown that small modifications of the nanosurface can have a drastic effect on the catalysis.
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Affiliation(s)
- E. Nehlig
- UFR SMBH
- Université Paris 13
- Sorbonne Paris Cité
- 93017 Bobigny Cedex
- France
| | - L. Motte
- UFR SMBH
- Université Paris 13
- Sorbonne Paris Cité
- 93017 Bobigny Cedex
- France
| | - E. Guénin
- UFR SMBH
- Université Paris 13
- Sorbonne Paris Cité
- 93017 Bobigny Cedex
- France
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35
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Wang Y, Li D, Lin J, Wei K. Organocatalytic asymmetric Michael addition of aldehydes and ketones to nitroalkenes catalyzed by adamantoyl l-prolinamide. RSC Adv 2015. [DOI: 10.1039/c4ra11214h] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A series of adamantoyl l-prolinamides have been synthesized.
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Affiliation(s)
- Yongchao Wang
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University)
- Ministry of Education
- School of Chemical Science and Technology
- Yunnan University
- Kunming 650091
| | - Dong Li
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University)
- Ministry of Education
- School of Chemical Science and Technology
- Yunnan University
- Kunming 650091
| | - Jun Lin
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University)
- Ministry of Education
- School of Chemical Science and Technology
- Yunnan University
- Kunming 650091
| | - Kun Wei
- Key Laboratory of Medicinal Chemistry for Natural Resource (Yunnan University)
- Ministry of Education
- School of Chemical Science and Technology
- Yunnan University
- Kunming 650091
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36
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Aromatic l-prolinamide-catalyzed asymmetric Michael addition of aldehydes to nitroalkenes. ACTA ACUST UNITED AC 2014. [DOI: 10.1016/j.tetasy.2014.11.006] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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37
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Yu H, Liu M, Han S. Highly efficient asymmetric Michael addition of aldehydes to nitroalkenes with 4,5-methano-l-proline as organocatalysts. Tetrahedron 2014. [DOI: 10.1016/j.tet.2014.08.069] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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38
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Lewandowski B, Wennemers H. Asymmetric catalysis with short-chain peptides. Curr Opin Chem Biol 2014; 22:40-6. [DOI: 10.1016/j.cbpa.2014.09.011] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/11/2014] [Revised: 09/08/2014] [Accepted: 09/10/2014] [Indexed: 10/24/2022]
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39
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Wang Y, Ji S, Wei K, Lin J. Epiandrosterone-derived prolinamide as an efficient asymmetric catalyst for Michael addition reactions of aldehydes to nitroalkenes. RSC Adv 2014. [DOI: 10.1039/c4ra03075c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022] Open
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40
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Kucherenko AS, Lisnyak VG, Chizhov AO, Zlotin SG. Primary Amine Attached to anN-(Carboxyalkyl)imidazolium Cation: A Recyclable Organocatalyst for the Asymmetric Michael Reaction. European J Org Chem 2014. [DOI: 10.1002/ejoc.201400045] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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41
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Mori K, Wakazawa M, Akiyama T. Stereoselective construction of all-carbon quaternary center by means of chiral phosphoric acid: highly enantioselective Friedel–Crafts reaction of indoles with β,β-disubstituted nitroalkenes. Chem Sci 2014. [DOI: 10.1039/c3sc53542h] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
Chiral phosphoric acid catalyzed Friedel–Crafts reaction of indoles with β-alkoxycarbonyl-β-disubstituted nitroalkenes was achieved.
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Affiliation(s)
- Keiji Mori
- Department of Chemistry
- Faculty of Science, Gakushuin University
- Toshima-ku, Japan
| | - Manari Wakazawa
- Department of Chemistry
- Faculty of Science, Gakushuin University
- Toshima-ku, Japan
| | - Takahiko Akiyama
- Department of Chemistry
- Faculty of Science, Gakushuin University
- Toshima-ku, Japan
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42
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Duschmalé J, Kohrt S, Wennemers H. Peptide catalysis in aqueous emulsions. Chem Commun (Camb) 2014; 50:8109-12. [DOI: 10.1039/c4cc01759e] [Citation(s) in RCA: 45] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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43
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Zhi C, Wang J, Luo B, Li X, Cao X, Pan Y, Gu H. The synthesis of cyclohexenone using l-proline immobilized on a silica gel catalyst by a continuous-flow approach. RSC Adv 2014. [DOI: 10.1039/c4ra01231c] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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44
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Funabiki K, Ohta M, Sakaida Y, Oida K, Kubota Y, Matsui M. High Diastereoselectivity Induced by a Fluorous Alkyl Group in the Asymmetric Michael Reaction of Nitroalkenes Catalyzed by a Prolinol Methyl Ether. ASIAN J ORG CHEM 2013. [DOI: 10.1002/ajoc.201300171] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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45
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Bächle F, Duschmalé J, Ebner C, Pfaltz A, Wennemers H. Organocatalytic Asymmetric Conjugate Addition of Aldehydes to Nitroolefins: Identification of Catalytic Intermediates and the Stereoselectivity-Determining Step by ESI-MS. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201305338] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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46
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Bächle F, Duschmalé J, Ebner C, Pfaltz A, Wennemers H. Organocatalytic Asymmetric Conjugate Addition of Aldehydes to Nitroolefins: Identification of Catalytic Intermediates and the Stereoselectivity-Determining Step by ESI-MS. Angew Chem Int Ed Engl 2013; 52:12619-23. [DOI: 10.1002/anie.201305338] [Citation(s) in RCA: 68] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 08/04/2013] [Indexed: 11/06/2022]
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47
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Karmann L, Kazmaier U. Thiol-Ene Click Reactions - Versatile Tools for the Modification of Unsaturated Amino Acids and Peptides. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300672] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
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48
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Kardos G, Soós T. Tether-Free Immobilized Bifunctional Squaramide Organocatalysts for Batch and Flow Reactions. European J Org Chem 2013. [DOI: 10.1002/ejoc.201300626] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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49
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Kastl R, Wennemers H. Peptide-Catalyzed Stereoselective Conjugate Addition Reactions Generating All-Carbon Quaternary Stereogenic Centers. Angew Chem Int Ed Engl 2013. [DOI: 10.1002/ange.201301583] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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50
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Kastl R, Wennemers H. Peptide-Catalyzed Stereoselective Conjugate Addition Reactions Generating All-Carbon Quaternary Stereogenic Centers. Angew Chem Int Ed Engl 2013; 52:7228-32. [DOI: 10.1002/anie.201301583] [Citation(s) in RCA: 105] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2013] [Indexed: 11/12/2022]
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