1
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Huang N, Luo J, Liao L, Zhao X. Catalytic Enantioselective Aminative Difunctionalization of Alkenes. J Am Chem Soc 2024; 146:7029-7038. [PMID: 38425285 DOI: 10.1021/jacs.4c00307] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/02/2024]
Abstract
Enantioselective difunctionalization of alkenes offers a straightforward means for the rapid construction of enantioenriched complex molecules. Despite the tremendous efforts devoted to this field, enantioselective aminative difunctionalization remains a challenge, particularly through an electrophilic addition fashion. Herein, we report an unprecedented approach for the enantioselective aminative difunctionalization of alkenes via copper-catalyzed electrophilic addition with external azo compounds as nitrogen sources. A series of valuable cyclic hydrazine derivatives via either [3 + 2] cycloaddition or intramolecular cyclization have been achieved in high chemo-, regio-, enantio-, and diastereoselectivities. In this transformation, a wide range of functional groups, such as carboxylic acid, hydroxy, amide, sulfonamide, and aryl groups, could serve as nucleophiles. Importantly, a new cyano oxazoline chiral ligand was found to play a crucial role in the control of enantioselectivity.
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Affiliation(s)
- Nan Huang
- Institute of Organic Chemistry and MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, IGCME, Sun Yat-Sen University, Guangzhou 510006, China
| | - Jie Luo
- Institute of Organic Chemistry and MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, IGCME, Sun Yat-Sen University, Guangzhou 510006, China
| | - Lihao Liao
- Institute of Organic Chemistry and MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, IGCME, Sun Yat-Sen University, Guangzhou 510006, China
| | - Xiaodan Zhao
- Institute of Organic Chemistry and MOE Key Laboratory of Bioinorganic and Synthetic Chemistry, School of Chemistry, IGCME, Sun Yat-Sen University, Guangzhou 510006, China
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2
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Kliemann MN, Teeuwen S, Weike C, Franciò G, Leitner W. Rhodium‐Catalyzed Asymmetric Hydrohydrazonemethylation of Styrenes: Access to Chiral Hydrazones, Hydrazides, Hydrazines and Amines. Adv Synth Catal 2022. [DOI: 10.1002/adsc.202200804] [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)
| | | | | | | | - Walter Leitner
- Max-Planck-Institute for Chemical Energy Conversion GERMANY
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3
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De Rosa M, Gambaro S, Soriente A, Della Sala P, Iuliano V, Talotta C, Gaeta C, Rescifina A, Neri P. Carbocation catalysis in confined space: activation of trityl chloride inside the hexameric resorcinarene capsule. Chem Sci 2022; 13:8618-8625. [PMID: 35974771 PMCID: PMC9337730 DOI: 10.1039/d2sc02901d] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2022] [Accepted: 06/06/2022] [Indexed: 11/21/2022] Open
Abstract
The hexameric resorcinarene capsule is able to promote carbocation catalysis inside its cavity.
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Affiliation(s)
- Margherita De Rosa
- Laboratory of Supramolecular Chemistry, Dipartimento di Chimica e Biologia “A. Zambelli”, Università di Salerno, Via Giovanni Paolo II, I-84084, Fisciano (SALERNO), Italy
| | - Stefania Gambaro
- Laboratory of Supramolecular Chemistry, Dipartimento di Chimica e Biologia “A. Zambelli”, Università di Salerno, Via Giovanni Paolo II, I-84084, Fisciano (SALERNO), Italy
| | - Annunziata Soriente
- Laboratory of Supramolecular Chemistry, Dipartimento di Chimica e Biologia “A. Zambelli”, Università di Salerno, Via Giovanni Paolo II, I-84084, Fisciano (SALERNO), Italy
| | - Paolo Della Sala
- Laboratory of Supramolecular Chemistry, Dipartimento di Chimica e Biologia “A. Zambelli”, Università di Salerno, Via Giovanni Paolo II, I-84084, Fisciano (SALERNO), Italy
| | - Veronica Iuliano
- Laboratory of Supramolecular Chemistry, Dipartimento di Chimica e Biologia “A. Zambelli”, Università di Salerno, Via Giovanni Paolo II, I-84084, Fisciano (SALERNO), Italy
| | - Carmen Talotta
- Laboratory of Supramolecular Chemistry, Dipartimento di Chimica e Biologia “A. Zambelli”, Università di Salerno, Via Giovanni Paolo II, I-84084, Fisciano (SALERNO), Italy
| | - Carmine Gaeta
- Laboratory of Supramolecular Chemistry, Dipartimento di Chimica e Biologia “A. Zambelli”, Università di Salerno, Via Giovanni Paolo II, I-84084, Fisciano (SALERNO), Italy
| | - Antonio Rescifina
- Dipartimento di Scienze del Farmaco e della Salute, Università di Catania, viale Andrea Doria, 6, 95125 Catania, Italy
| | - Placido Neri
- Laboratory of Supramolecular Chemistry, Dipartimento di Chimica e Biologia “A. Zambelli”, Università di Salerno, Via Giovanni Paolo II, I-84084, Fisciano (SALERNO), Italy
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4
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Aalam MJ, Deepa, Chaudhary P, Meena DR, Yadav GD, Singh S. DABCO-based chiral ionic liquids as recoverable and reusable organocatalyst for asymmetric Diels-Alder reaction. Chirality 2021; 34:134-146. [PMID: 34762344 DOI: 10.1002/chir.23385] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 10/13/2021] [Accepted: 10/15/2021] [Indexed: 11/09/2022]
Abstract
New DABCO-based chiral ionic liquids were synthesized and evaluated in asymmetric Diels-Alder reaction of cyclopentadiene with α,β-unsaturated aldehydes or 4-phenyl-3-buten-2-one. Chiral ionic liquid of modified MacMillan catalyst having a DABCO cation and hexafluorophosphate anion acts as organocatalyst (5 mol%) for the Diels-Alder reaction of crotonaldehyde and cyclopentadiene producing 98% of the product and 87% ee (endo) in CH3 CN/H2 O (95/5) at 25°C in 2 h. The scope and limitations of the catalysis were also studied by using cyclopentadiene and α,β-unsaturated aldehydes, and the Diels-Alder products were obtained in 18%-92% yields with 68%-93% ee. The catalyst was recycled and reused up to 6 cycles with a slight drop in ee and conversion of the product.
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Affiliation(s)
| | - Deepa
- Department of Chemistry, University of Delhi, Delhi, India
| | | | - Dhan Raj Meena
- Department of Chemistry, University of Delhi, Delhi, India
| | | | - Surendra Singh
- Department of Chemistry, University of Delhi, Delhi, India
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5
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Li B, Liu D, Hu Y, Chen J, Zhang Z, Zhang W. Nickel‐Catalyzed Asymmetric Hydrogenation of Hydrazones. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100642] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Bowen Li
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 P. R. China
| | - Dan Liu
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 P. R. China
| | - Yanhua Hu
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 P. R. China
| | - Jianzhong Chen
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 P. R. China
| | - Zhenfeng Zhang
- School of Pharmacy Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 R. China
| | - Wanbin Zhang
- Shanghai Key Laboratory for Molecular Engineering of Chiral Drugs Frontiers Science Center for Transformative Molecules School of Chemistry and Chemical Engineering Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 P. R. China
- School of Pharmacy Shanghai Jiao Tong University 800 Dongchuan Road Shanghai 200240 R. China
- College of Chemistry Zhengzhou University 75 Daxue Road Zhengzhou 450052 P. R. China
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6
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Trippe L, Nava A, Frank A, Nubbemeyer U. Synthesis of Enantiopure 6,11‐Methylene Lipoxin B
4
Methyl Ester. European J Org Chem 2021. [DOI: 10.1002/ejoc.202001591] [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)
- Lukas Trippe
- Organische Chemie Johannes Gutenberg-Universität Mainz Duesbergweg 10–14 D-55128 Mainz Germany
| | - Analuisa Nava
- BASF Lampertheim GmbH Chemiestr. 22 68623 Lampertheim Germany
| | - Andrea Frank
- Organische Chemie Johannes Gutenberg-Universität Mainz Duesbergweg 10–14 D-55128 Mainz Germany
| | - Udo Nubbemeyer
- Organische Chemie Johannes Gutenberg-Universität Mainz Duesbergweg 10–14 D-55128 Mainz Germany
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7
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Deepa, Yadav GD, Chaudhary P, Aalam MJ, Meena DR, Singh S. Chiral Imidazolidin-4-one with catalytic amount of Dicationic ionic liquid act as a recoverable and reusable Organocatalyst for asymmetric Diels-Alder reaction. Chirality 2019; 32:64-72. [PMID: 31710138 DOI: 10.1002/chir.23137] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2019] [Revised: 09/07/2019] [Accepted: 09/11/2019] [Indexed: 11/11/2022]
Abstract
Imidazolidin-4-one is used as a recoverable organocatalyst for the asymmetric Diels-Alder reaction in the presence of catalytic amount of dicationic ionic liquid and trifluoroacetic acid as a co-catalyst. The Diels-Alder reaction between model substrate cyclopentadiene and crotonaldehyde gave the product in 95% conversion and 87% ee of the endo-product. The catalyst was shown better reusability when the 20 mol% of dicationic ionic liquid was used and catalyst was reused upto 5 cycles, conversion remains upto 3 recycles but ee of endo-9 was slightly droped.
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Affiliation(s)
- Deepa
- Department of Chemistry, University of Delhi, Delhi, India
| | | | | | | | - Dhan Raj Meena
- Department of Chemistry, University of Delhi, Delhi, India
| | - Surendra Singh
- Department of Chemistry, University of Delhi, Delhi, India
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8
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Perez F, Leveille T, Bertolotti M, Rodriguez J, Coquerel Y. Spirobicyclic and Tetracyclic Pyrazolidinones: Syntheses and Properties. European J Org Chem 2019. [DOI: 10.1002/ejoc.201900989] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Fabien Perez
- CNRS, Centrale Marseille, ISM2; Aix Marseille Université; 13397 Marseille France
| | - Thibault Leveille
- CNRS, Centrale Marseille, ISM2; Aix Marseille Université; 13397 Marseille France
| | - Mathilde Bertolotti
- CNRS, Centrale Marseille, ISM2; Aix Marseille Université; 13397 Marseille France
| | - Jean Rodriguez
- CNRS, Centrale Marseille, ISM2; Aix Marseille Université; 13397 Marseille France
| | - Yoann Coquerel
- CNRS, Centrale Marseille, ISM2; Aix Marseille Université; 13397 Marseille France
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9
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Gan X, Fu Z, Liu L, Yan Y, Chen C, Zhou Y, Dong J. Phosphorous acid promoted isomerization of propargyl alcohols to α,β-unsaturated carbonyl compounds. Tetrahedron Lett 2019. [DOI: 10.1016/j.tetlet.2019.06.065] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
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10
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Shaykhutdinova P, Oestreich M. Achieving Enantioselectivity in Difficult Cyclohexa-1,3-diene Diels–Alder Reactions with Sulfur-Stabilized Silicon Cations as Lewis Acid Catalysts. Org Lett 2018; 20:7029-7033. [DOI: 10.1021/acs.orglett.8b02945] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Polina Shaykhutdinova
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 115, 10623 Berlin, Germany
| | - Martin Oestreich
- Institut für Chemie, Technische Universität Berlin, Straße des 17. Juni 115, 10623 Berlin, Germany
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11
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Bulman Page PC, Kinsey FS, Chan Y, Strutt IR, Slawin AMZ, Jones GA. Novel binaphthyl and biphenyl α- and β-amino acids and esters: organocatalysis of asymmetric Diels-Alder reactions. A combined synthetic and computational study. Org Biomol Chem 2018; 16:7400-7416. [PMID: 30259945 DOI: 10.1039/c8ob01795f] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Asymmetric catalysis of the Diels-Alder reaction between cyclopentadiene and cinnamaldehydes has been studied using as catalysts a range of novel α- and β-aminoacids and aminoesters with binaphthyl and biphenyl backbones, providing enantioselectivities of up to 62% ee. B3LYP/6-31G* calculations, including free energy corrections, have been carried out on a binaphthyl catalyst example to identify transition state structures and to aid in the identification of major enantiomers. The calculated product ratios agree well with the experimental data; the transition states identified involve preferential approach of cyclopentene along a trajectory adjacent to the acid/ester group. The four lowest energy transition states display a stabilizing dipolar interaction between the carbonyl group oxygen atom and a terminal proton of the diene unit.
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Affiliation(s)
- Philip C Bulman Page
- School of Chemistry, University of East Anglia, Norwich Research Park, Norwich, NR4 7TJ, UK.
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12
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Olesiejuk M, Kudelko A, Gajda K, Dziuk B, Ejsmont K. π-Electron delocalization in 2-benzoyl-5-phenylpyrazolidin-3-one. ZEITSCHRIFT FUR NATURFORSCHUNG SECTION B-A JOURNAL OF CHEMICAL SCIENCES 2018. [DOI: 10.1515/znb-2018-0072] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The crystal and molecular structures of 2-benzoyl-5-phenylpyrazolidin-3-one have been characterized by X-ray diffraction along with density functional theory studies. Cinnamic acid chloride was reacted with benzhydrazide, yielding 2-benzoyl-5-phenylpyrazolidin-3-one. This product was formed in the transformation comprising the nucleophilic addition of benzhydrazide to the styryl fragment of the α,β-unsaturated arrangement and subsequent cyclization. The molecule contains two benzene rings and one five-membered heterocyclic ring with an N–N single bond. The five-membered ring is composed of three atoms of sp
3 hybridization and two atoms of sp
2 hybridization, which cause the flattening of the heterocyclic ring. The Harmonic Oscillator Model of Aromaticity and Nucleus-Independent Chemical Shift indexes, calculated for the benzene rings, demonstrate that there are no substantial interactions between the regions of π-electron delocalization in the molecule. In the crystal structure, there are N–H···O hydrogen bonds that link the molecules along the crystallographic c axis and weak intermolecular C–H···O hydrogen bonds.
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Affiliation(s)
- Monika Olesiejuk
- Department of Chemical Organic Technology and Petrochemistry , The Silesian University of Technology , Krzywoustego 4 , 44-100 Gliwice , Poland
| | - Agnieszka Kudelko
- Department of Chemical Organic Technology and Petrochemistry , The Silesian University of Technology , Krzywoustego 4 , 44-100 Gliwice , Poland
| | - Katarzyna Gajda
- Faculty of Chemistry, University of Opole , Oleska 48 , 45-052 Opole , Poland
| | - Błażej Dziuk
- Faculty of Chemistry, University of Opole , Oleska 48 , 45-052 Opole , Poland
| | - Krzysztof Ejsmont
- Faculty of Chemistry, University of Opole , Oleska 48 , 45-052 Opole , Poland
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13
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Surzhko V, Roisnel T, Le Grel B, Le Grel P, Lalli C, Argouarch G. Synthesis of picolinohydrazides and their evaluation as ligands in the zinc-catalyzed hydrosilylation of ketones. Tetrahedron Lett 2017. [DOI: 10.1016/j.tetlet.2017.02.062] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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14
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Mohammadi Ziarani G, Fathi Vavsari V. The role of hydrazide compounds in asymmetric synthesis. TETRAHEDRON: ASYMMETRY 2017; 28:203-214. [DOI: 10.1016/j.tetasy.2016.12.001] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/17/2023]
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15
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Pušavec Kirar E, Grošelj U, Golobič A, Požgan F, Pusch S, Weber C, Andernach L, Štefane B, Opatz T, Svete J. Absolute Configuration Determination of 2,3-Dihydro-1H,5H-pyrazolo[1,2-a]pyrazoles Using Chiroptical Methods at Different Wavelengths. J Org Chem 2016; 81:11802-11812. [PMID: 27801585 DOI: 10.1021/acs.joc.6b02270] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Abstract
A correlation between the absolute configuration and chiroptical properties of nonracemic 1,6,7-trisubstituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazoles was studied. A series of 16 novel representatives were prepared by Cu-catalyzed [3 + 2] cycloadditions of racemic (Z)-2-benzylidene-5-oxopyrazolidin-2-ium-1-ides to tert-butyl (S)-(3-oxopent-4-yn-2-yl)carbamate, and their structures were determined by NMR, VCD, ECD, and X-ray diffraction. A clear correlation between the sign of specific rotation and configuration at position C(1) allows for easy determination of the absolute configuration of 1,6,7-trisubstituted 2,3-dihydro-1H,5H-pyrazolo[1,2-a]pyrazoles by ECD and NMR. While VCD, requiring milligram quantities, allowed the determination of the correct relative and absolute configuration without additional information from other methods, the stereochemical analysis by ECD required knowledge of the relative configuration derived from NMR at a comparable computational level.
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Affiliation(s)
- Eva Pušavec Kirar
- Faculty of Chemistry and Chemical Technology, University of Ljubljana , Večna pot 113, SI-1000 Ljubljana, Slovenia
| | - Uroš Grošelj
- Faculty of Chemistry and Chemical Technology, University of Ljubljana , Večna pot 113, SI-1000 Ljubljana, Slovenia
| | - Amalija Golobič
- Faculty of Chemistry and Chemical Technology, University of Ljubljana , Večna pot 113, SI-1000 Ljubljana, Slovenia
| | - Franc Požgan
- Faculty of Chemistry and Chemical Technology, University of Ljubljana , Večna pot 113, SI-1000 Ljubljana, Slovenia
| | - Stefan Pusch
- Institut für Organische Chemie, Johannes Gutenberg-Universität Mainz , Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Carina Weber
- Institut für Organische Chemie, Johannes Gutenberg-Universität Mainz , Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Lars Andernach
- Institut für Organische Chemie, Johannes Gutenberg-Universität Mainz , Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Bogdan Štefane
- Faculty of Chemistry and Chemical Technology, University of Ljubljana , Večna pot 113, SI-1000 Ljubljana, Slovenia
| | - Till Opatz
- Institut für Organische Chemie, Johannes Gutenberg-Universität Mainz , Duesbergweg 10-14, D-55128 Mainz, Germany
| | - Jurij Svete
- Faculty of Chemistry and Chemical Technology, University of Ljubljana , Večna pot 113, SI-1000 Ljubljana, Slovenia
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16
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Chen ZP, Hu SB, Chen MW, Zhou YG. Synthesis of Chiral Fluorinated Hydrazines via Pd-Catalyzed Asymmetric Hydrogenation. Org Lett 2016; 18:2676-9. [DOI: 10.1021/acs.orglett.6b01118] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zhang-Pei Chen
- State
Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Shu-Bo Hu
- State
Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Mu-Wang Chen
- State
Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
| | - Yong-Gui Zhou
- State
Key Laboratory of Catalysis, Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Dalian 116023, China
- State
Key Laboratory of Organometallic Chemistry, Shanghai Institute of
Organic Chemistry, Chinese Academy of Sciences, Shanghai 200032, China
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17
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Brazier JB, Gibbs TJK, Rowley JH, Samulis L, Yau SC, Kennedy AR, Platts JA, Tomkinson NCO. Improving catalyst activity in secondary amine catalysed transformations. Org Biomol Chem 2015; 13:133-41. [PMID: 25347784 DOI: 10.1039/c4ob01916d] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The effect on catalyst performance of altering substituents at the 2-position of the Macmillan imidazolidinone has been examined. Condensation of L-phenylalanine N-methyl amide with acetophenone derivatives results in a series of imidazolidinones whose salts can be used to accelerate the Diels-Alder cycloaddition. Electron withdrawing groups significantly increase the overall rate of cycloaddition without compromise in selectivity. The most effective catalyst was shown to be efficient for a variety of substrates and the applicability of this catalyst to alternative secondary amine catalysed transformations is also discussed.
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Affiliation(s)
- John B Brazier
- School of Chemistry, Main Building, Cardiff University, Park Place, Cardiff, CF10 3AT, UK
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18
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Chauhan MS, Kumar P, Singh S. Synthesis of MacMillan catalyst modified with ionic liquid as a recoverable catalyst for asymmetric Diels–Alder reaction. RSC Adv 2015. [DOI: 10.1039/c5ra09710j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
MacMillan catalyst was modified with imidazolium ionic liquid by ester linkage and acts as recoverable and reusable catalyst for asymmetric Diels–Alder reactions.
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Affiliation(s)
| | - Pramod Kumar
- Department of Chemistry
- University of Delhi
- Delhi
- India-110007
| | - Surendra Singh
- Department of Chemistry
- University of Delhi
- Delhi
- India-110007
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19
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Gould E, Walden DM, Kasten K, Johnston RC, Wu J, Slawin AMZ, Mustard TJL, Johnston B, Davies T, Ha-Yeon Cheong P, Smith AD. Catalyst selective and regiodivergent O- to C- or N-carboxyl transfer of pyrazolyl carbonates: synthetic and computational studies. Chem Sci 2014. [DOI: 10.1039/c4sc00879k] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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