1
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Khettar I, Sinibaldi A, Schettini R, Gorini G, Siddiqa A, Litta AD, De Riccardis F, Izzo I, Sala GD. Flexible and Convergent Enantioselective Total Synthesis of ( R)-Juglanaloids A and B: Two Phthalide Spiro Alkaloids with Potential Alzheimer's Disease Inhibitory Activity. J Org Chem 2024; 89:7255-7262. [PMID: 38718382 DOI: 10.1021/acs.joc.4c00740] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/18/2024]
Abstract
Juglanaloids A and B are recently isolated natural products characterized by an unprecedented spiro bicyclic isobenzofuranone-tetrahydrobenzazepinone framework and a promising antiamyloid activity. Here reported is a straightforward convergent total synthesis of these natural products, which were obtained in high enantiomeric purity (94% and >99% ee for juglanaloids A and B, respectively) through an eight-step longest linear sequence, based on an efficient and reliable enantioselective phase-transfer-catalyzed alkylation step. Considering the interesting biological activity of juglanaloids, this convenient, highly enantioselective, flexible, and predictable synthetic strategy promises to be a powerful tool for accessing potentially bioactive spiro bicyclic phthalide-tetrahydrobenzazepinone derivatives.
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Affiliation(s)
- Ibrahim Khettar
- Dipartimento di Chimica e Biologia "A. Zambelli", Università degli Studi di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Salerno, Italy
- Laboratory of Catalysis and Synthesis in Organic Chemistry, Abou Bekr Belkaïd University, Rue Abi Ayed Abdelkrim Fg Pasteur, B.P 119 13000, 13000 Tlemcen, Algeria
| | - Arianna Sinibaldi
- Dipartimento di Chimica e Biologia "A. Zambelli", Università degli Studi di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Salerno, Italy
| | - Rosaria Schettini
- Dipartimento di Chimica e Biologia "A. Zambelli", Università degli Studi di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Salerno, Italy
| | - Giorgio Gorini
- Dipartimento di Chimica e Biologia "A. Zambelli", Università degli Studi di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Salerno, Italy
| | - Ayesha Siddiqa
- Dipartimento di Chimica e Biologia "A. Zambelli", Università degli Studi di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Salerno, Italy
| | - Antonella Dentoni Litta
- Dipartimento di Chimica e Biologia "A. Zambelli", Università degli Studi di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Salerno, Italy
| | - Francesco De Riccardis
- Dipartimento di Chimica e Biologia "A. Zambelli", Università degli Studi di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Salerno, Italy
| | - Irene Izzo
- Dipartimento di Chimica e Biologia "A. Zambelli", Università degli Studi di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Salerno, Italy
| | - Giorgio Della Sala
- Dipartimento di Chimica e Biologia "A. Zambelli", Università degli Studi di Salerno, Via Giovanni Paolo II 132, 84084 Fisciano, Salerno, Italy
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2
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Pecchini P, Fochi M, Bartoccini F, Piersanti G, Bernardi L. Enantioselective organocatalytic strategies to access noncanonical α-amino acids. Chem Sci 2024; 15:5832-5868. [PMID: 38665517 PMCID: PMC11041364 DOI: 10.1039/d4sc01081g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2024] [Accepted: 03/23/2024] [Indexed: 04/28/2024] Open
Abstract
Organocatalytic asymmetric synthesis has evolved over the years and continues to attract the interest of many researchers worldwide. Enantiopure noncanonical amino acids (ncAAs) are valuable building blocks in organic synthesis, medicinal chemistry, and chemical biology. They are employed in the elaboration of peptides and proteins with enhanced activities and/or improved properties compared to their natural counterparts, as chiral catalysts, in chiral ligand design, and as chiral building blocks for asymmetric syntheses of complex molecules, including natural products. The linkage of ncAA synthesis and enantioselective organocatalysis, the subject of this perspective, tries to imitate the natural biosynthetic process. Herein, we present contemporary and earlier developments in the field of organocatalytic activation of simple feedstock materials, providing potential ncAAs with diverse side chains, unique three-dimensional structures, and a high degree of functionality. These asymmetric organocatalytic strategies, useful for forging a wide range of C-C, C-H, and C-N bonds and/or combinations thereof, vary from classical name reactions, such as Ugi, Strecker, and Mannich reactions, to the most advanced concepts such as deracemisation, transamination, and carbene N-H insertion. Concurrently, we present some interesting mechanistic studies/models, providing information on the chirality transfer process. Finally, this perspective highlights, through the diversity of the amino acids (AAs) not selected by nature for protein incorporation, the most generic modes of activation, induction, and reactivity commonly used, such as chiral enamine, hydrogen bonding, Brønsted acids/bases, and phase-transfer organocatalysis, reflecting their increasingly important role in organic and applied chemistry.
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Affiliation(s)
- Pietro Pecchini
- Department of Industrial Chemistry "Toso Montanari", Center for Chemical Catalysis C3 & INSTM RU Bologna V. Gobetti 85 40129 Bologna Italy
| | - Mariafrancesca Fochi
- Department of Industrial Chemistry "Toso Montanari", Center for Chemical Catalysis C3 & INSTM RU Bologna V. Gobetti 85 40129 Bologna Italy
| | - Francesca Bartoccini
- Department of Biomolecular Sciences, University of Urbino Carlo Bo Piazza Rinascimento 6 61029 Urbino PU Italy
| | - Giovanni Piersanti
- Department of Biomolecular Sciences, University of Urbino Carlo Bo Piazza Rinascimento 6 61029 Urbino PU Italy
| | - Luca Bernardi
- Department of Industrial Chemistry "Toso Montanari", Center for Chemical Catalysis C3 & INSTM RU Bologna V. Gobetti 85 40129 Bologna Italy
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3
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Boddy A, Sahay AK, Rivers EL, White AJP, Spivey AC, Bull JA. Enantioselective Phase-Transfer-Catalyzed Synthesis of Spirocyclic Azetidine Oxindoles. Org Lett 2024; 26:2079-2084. [PMID: 38447584 PMCID: PMC10949229 DOI: 10.1021/acs.orglett.4c00358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/29/2024] [Revised: 02/28/2024] [Accepted: 03/04/2024] [Indexed: 03/08/2024]
Abstract
Spiro-3,2'-azetidine oxindoles combine two independently important pharmacophores in an understudied spirocyclic motif that is attractive for medicinal chemistry. Here, the enantioselective synthesis of these structures is achieved in up to 2:98 er through intramolecular C-C bond formation, involving activation of the substrate with a novel SF5-containing chiral cation phase-transfer (PT) catalyst. The products are readily elaborated/deprotected to afford medicinally relevant enantioenriched compounds. Control experiments suggest an interfacial PT mechanism, whereby catalytic asymmetric induction is achieved through the activation of the chloride leaving group.
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Affiliation(s)
- Alexander
J. Boddy
- Department
of Chemistry, Imperial College London, Molecular
Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K.
| | - Aditya K. Sahay
- Department
of Chemistry, Imperial College London, Molecular
Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K.
| | - Emma L. Rivers
- Hit
Discovery, Discovery Sciences, R&D, AstraZeneca, Cambridge, U.K.
| | - Andrew J. P. White
- Department
of Chemistry, Imperial College London, Molecular
Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K.
| | - Alan C. Spivey
- Department
of Chemistry, Imperial College London, Molecular
Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K.
| | - James A. Bull
- Department
of Chemistry, Imperial College London, Molecular
Sciences Research Hub, White City Campus, Wood Lane, London W12 0BZ, U.K.
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4
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Murayama S, Li Z, Liang H, Liu Y, Naka H, Maruoka K. Impact of Catalyst Deuteration on the Reactivity of Chiral Phase-Transfer Organocatalysts. Chemistry 2023; 29:e202301866. [PMID: 37332072 DOI: 10.1002/chem.202301866] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2023] [Revised: 06/16/2023] [Accepted: 06/16/2023] [Indexed: 06/20/2023]
Abstract
Site-specifically deuterated organocatalysts were prepared and found to show improved reactivity over the non-deuterated analogs. Two privileged C2 -symmetric chiral binaphthyl-modified tetraalkylammonium salts were selected for this study. The stability of these phase-transfer catalysts was generally improved by site-specific deuteration, though the degree of improvement was structure dependent. In particular, a large secondary kinetic isotope effect was observed for the tetradeuterated phase-transfer catalyst. The performance of these deuterated catalysts in the asymmetric catalytic alkylation of amino acid derivatives was better than that of non-deuterated analogs at low catalyst loadings. The results suggest that catalyst deuteration is a promising strategy for enhancing the stability and performance of organocatalysts.
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Affiliation(s)
- Sei Murayama
- Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, 606-8501, Japan
| | - Zhurong Li
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Huatai Liang
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Yan Liu
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou, 510006, P. R. China
| | - Hiroshi Naka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, 606-8501, Japan
- Deuterium Science Research Unit Center for the Promotion of Interdisciplinary Education and Research, Kyoto University, Kyoto, 606-8501, Japan
| | - Keiji Maruoka
- Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, 606-8501, Japan
- School of Chemical Engineering and Light Industry, Guangdong University of Technology, Guangzhou, 510006, P. R. China
- Guangdong Provincial Key Laboratory of Plant Resources Biorefinery, Guangdong University of Technology, Guangzhou, 510006, P. R. China
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5
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Mairhofer C, Waser M. Dibenzoylperoxide as a Versatile Oxidant for Oxidative Azidations of Phenols Using Quaternary Ammonium Iodides or Bromides. Adv Synth Catal 2023; 365:2757-2762. [DOI: 10.1002/adsc.202300405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2023] [Indexed: 09/02/2023]
Abstract
AbstractDibenzoylperoxide emerged as a versatile oxidant for quaternary ammonium iodide or bromide‐catalyzed reactions of phenol derivatives with NaN3. While the use of iodides allowed for efficient benzylic azidations under these oxidative conditions, the use of bromides allowed for dearomative azidations instead. Both approaches have been successfully applied to different phenol derivatives and a first proof‐of‐concept for an enantioselective variant using chiral quat. ammonium bromides has been obtained as well.
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Affiliation(s)
- Christopher Mairhofer
- Institute of Organic Chemistry Johannes Kepler University Linz Altenbergerstr. 69 4040 Linz Austria
| | - Mario Waser
- Institute of Organic Chemistry Johannes Kepler University Linz Altenbergerstr. 69 4040 Linz Austria
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6
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Stockhammer L, Craik R, Monkowius U, Cordes DB, Smith AD, Waser M. Isothiourea-Catalyzed Enantioselective Functionalisation of Glycine Schiff Base Aryl Esters via 1,6- and 1,4-Additions. CHEMISTRYEUROPE 2023; 1:e202300015. [PMID: 38882579 PMCID: PMC7616101 DOI: 10.1002/ceur.202300015] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/28/2023] [Indexed: 06/18/2024]
Abstract
The enantioselective α-functionalisation of glycine Schiff base aryl esters through isothiourea catalysis is successfully demonstrated for 1,6-additions to para-quinone methides (21 examples, up to 95:5 dr and 96:4 er) and 1,4-additions to methylene substituted dicarbonyl or disulfonyl Michael acceptors (17 examples, up to 98:2 er). This nucleophilic organocatalysis approach gives access to a range of α-functionalised α-amino acid derivatives and further transformations of the activated aryl ester group provide a straightforward entry to advanced amino acid-based esters, amides or thioesters.
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Affiliation(s)
- Lotte Stockhammer
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz (Austria)
| | - Rebecca Craik
- EaStCHEM, School of Chemistry, University of St Andrews, KY16 9ST St Andrews, Fife, (UK)
| | - Uwe Monkowius
- School of Education, Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz (Austria)
| | - David B Cordes
- EaStCHEM, School of Chemistry, University of St Andrews, KY16 9ST St Andrews, Fife, (UK)
| | - Andrew D Smith
- EaStCHEM, School of Chemistry, University of St Andrews, KY16 9ST St Andrews, Fife, (UK)
| | - Mario Waser
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz (Austria)
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7
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Champlin AT, Ellman JA. Preparation of Sulfilimines by Sulfur-Alkylation of N-Acyl Sulfenamides with Alkyl Halides. J Org Chem 2023; 88:7607-7614. [PMID: 37221855 PMCID: PMC10257216 DOI: 10.1021/acs.joc.3c00750] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Sulfur alkylation of N-acyl sulfenamides with alkyl halides provides sulfilimines in 47% to 98% yields. A broad scope was established with a variety of aryl and alkyl sulfenamides, including for different N-acyl groups. Alkyl halides with different steric and electronic properties were effective inputs, including methyl, primary, secondary, benzyl, and propargyl halides. A proof-of-concept asymmetric phase-transfer alkylation was also demonstrated. A sulfilimine product was readily converted to an N-acyl and to a free sulfoximine, which represent important motifs in medicinal chemistry.
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Affiliation(s)
- Andrew T. Champlin
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
| | - Jonathan A. Ellman
- Department of Chemistry, Yale University, New Haven, Connecticut 06520, United States
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8
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Zebrowski P, Röser K, Chrenko D, Pospíšil J, Waser M. Enantioselective β-Selective Addition of Isoxazolidin-5-ones to Allenoates Catalyzed by Quaternary Ammonium Salts. SYNTHESIS-STUTTGART 2023; 55:1706-1713. [PMID: 38855403 PMCID: PMC7616069 DOI: 10.1055/a-1948-5493] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
Abstract
The enantioselective addition of isoxazolidin-5-ones to the β-carbon of allenoates has been carried out by using a novel spirobiindane-based quaternary ammonium salt catalyst. This protocol, which proceeds under classical liquid-solid phase-transfer conditions, gives access to unprecedented highly functionalized β2,2-amino acid derivatives with good enantioselectivities and in high yields, and further manipulations of these products have been carried out as well.
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Affiliation(s)
- Paul Zebrowski
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria
| | - Katharina Röser
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria
| | - Daniel Chrenko
- Department of Chemical Biology, Faculty of Science, Palacký University, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
| | - Jiří Pospíšil
- Department of Chemical Biology, Faculty of Science, Palacký University, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
- Laboratory of Growth Regulators, Palacký University & Institute of Experimental Botany AS CR, Šlechtitelů 27, 783 71 Olomouc, Czech Republic
| | - Mario Waser
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040 Linz, Austria
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9
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Kumar Sharma S. The Importance of Organocatalysis (Asymmetric and Non‐Asymmetric) in Agrochemicals. ChemistrySelect 2023. [DOI: 10.1002/slct.202300204] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/30/2023]
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10
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Melillo A, Kiani A, Schettini R, Acocella MR. Carbon black intercalation compound as catalyst for unprecedent phase-transfer-catalyzed nucleophilic substitution (SN2) in water. MOLECULAR CATALYSIS 2023. [DOI: 10.1016/j.mcat.2023.112951] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
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11
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Wang Y, Wang S, Wu Y, Zhao T, Liu J, Zheng J, Wang L, Lv J, Zhang T. Fast, highly enantioselective, and sustainable fluorination of 4-substituted pyrazolones catalyzed by amide-based phase-transfer catalysts. Org Chem Front 2023. [DOI: 10.1039/d3qo00269a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/05/2023]
Abstract
Highly enantioselective and sustainable fluorination of 4-substituted pyrazolones has been developed by amide-based phase-transfer catalysts.
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Affiliation(s)
- Yakun Wang
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
| | - Shuaifei Wang
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
| | - Yufeng Wu
- School of Chemical Engineering, Dalian University of Technology, Dalian, Liaoning 116024, P.R. China
| | - Ting Zhao
- School of Pharmacy, Shenyang Pharmaceutical University, Shenyang, Liaoning 117004, P.R. China
| | - Jie Liu
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
| | - Junlin Zheng
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
| | - Lin Wang
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
| | - Jieli Lv
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
| | - Tao Zhang
- School of Pharmacy, Xinxiang Medical University, Xinxiang, Henan 453003, P.R. China
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12
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Ruck RT, Strotman NA, Krska SW. The Catalysis Laboratory at Merck: 20 Years of Catalyzing Innovation. ACS Catal 2022. [DOI: 10.1021/acscatal.2c05159] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Rebecca T. Ruck
- Department of Process Research & Development, Merck & Co., Inc., Rahway, New Jersey07065, United States
| | - Neil A. Strotman
- Department of Pharmaceutical Sciences & Clinical Supplies, Merck & Co., Inc., Rahway, New Jersey07065, United States
| | - Shane W. Krska
- Chemistry Capabilities Accelerating Therapeutics, Merck & Co., Inc., Kenilworth, New Jersey07033, United States
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13
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Waser M, Winter M, Mairhofer C. (Thio)urea containing chiral ammonium salt catalysts. CHEM REC 2022:e202200198. [PMID: 36175162 DOI: 10.1002/tcr.202200198] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2022] [Revised: 08/25/2022] [Indexed: 11/08/2022]
Abstract
(Thio)-urea-containing bifunctional quaternary ammonium salts emerged as powerful non-covalently interacting organocatalysts over the course of the last decade. The most commonly employed catalysts in this field are either based on Cinchona alkaloids, α-amino acids, or trans-cyclohexane-1,2-diamine. Our group has been heavily engaged in the design and use of such catalysts, i. e. trans-cyclohexane-1,2-diamine-based ones for around 10 years now, and it is therefore the intention of this short personal account to provide an overview of the, at least in our opinion, most significant and pioneering achievements in this field by looking on catalyst design and asymmetric method development, with a special focus on our own contributions.
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Affiliation(s)
- Mario Waser
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040, Linz, Austria
| | - Michael Winter
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040, Linz, Austria
| | - Christopher Mairhofer
- Institute of Organic Chemistry, Johannes Kepler University Linz, Altenbergerstrasse 69, 4040, Linz, Austria
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14
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Green Catalysts in the Synthesis of Biopolymers and Biomaterials. ChemistrySelect 2022. [DOI: 10.1002/slct.202201276] [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]
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15
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Hughes DL. Highlights of the Recent Patent Literature: Focus on Asymmetric Organocatalysis. Org Process Res Dev 2022. [DOI: 10.1021/acs.oprd.2c00139] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- David L. Hughes
- Cidara Therapeutics, 6755 Mira Mesa Blvd., Suite 123-217, San Diego, California 92121, United States
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16
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17
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Buttard F, Champagne PA. Binding Modes and Origins of Enantioselectivity in the Phase-Transfer-Catalyzed Conjugate Cyanation of β-Trifluoromethylated Chalcones. ACS Catal 2022. [DOI: 10.1021/acscatal.2c01904] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Floris Buttard
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
| | - Pier Alexandre Champagne
- Department of Chemistry and Environmental Science, New Jersey Institute of Technology, Newark, New Jersey 07102, United States
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18
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Lee S, Chung W. Enantioselective halogenation via asymmetric
phase‐transfer
catalysis. B KOREAN CHEM SOC 2022. [DOI: 10.1002/bkcs.12546] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Sunggi Lee
- Department of Physics and Chemistry DGIST Daegu Republic of Korea
| | - Won‐jin Chung
- Department of Chemistry GIST Gwangju Republic of Korea
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19
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Chen L, Liang W. Phase-transfer catalyzed Michael/ammonolysis cascade reactions of enaminones and olefinic azlactones: a new approach to structurally diverse quinoline-2,5-diones. Org Biomol Chem 2022; 20:3201-3210. [PMID: 35352072 DOI: 10.1039/d2ob00096b] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Michael/ammonolysis cascade reactions between cyclohexane-1,3-dione-derived enaminones and olefinic azlactones via phase-transfer catalysis have been developed. This method provides rapid access to a suite of architecturally complex and diverse quinoline-2,5-diones bearing a secondary amide group at the C-3 position in moderate to excellent yields (53-94%) and with excellent diastereoselectivities (>99 : 1 dr in most cases). The achievement of a preparative-scale reaction and the diverse product derivatization that can be obtained highlight the application potential of this protocol both in academic and industrial settings. An investigation of the reaction mechanism implies that tetrabutylammonium hydroxide may be the actual catalyst during this cascade reaction.
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Affiliation(s)
- Lin Chen
- School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, P. R. of China.
| | - Wei Liang
- School of Chemistry and Materials Science, Guizhou Normal University, Guiyang 550001, P. R. of China.
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20
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Pupo G, Gouverneur V. Hydrogen Bonding Phase-Transfer Catalysis with Alkali Metal Fluorides and Beyond. J Am Chem Soc 2022; 144:5200-5213. [PMID: 35294171 PMCID: PMC9084554 DOI: 10.1021/jacs.2c00190] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Phase-transfer catalysis (PTC) is one of the most powerful catalytic manifolds for asymmetric synthesis. Chiral cationic or anionic PTC strategies have enabled a variety of transformations, yet studies on the use of insoluble inorganic salts as nucleophiles for the synthesis of enantioenriched molecules have remained elusive. A long-standing challenge is the development of methods for asymmetric carbon-fluorine bond formation from readily available and cost-effective alkali metal fluorides. In this Perspective, we describe how H-bond donors can provide a solution through fluoride binding. We use examples, primarily from our own research, to discuss how hydrogen bonding interactions impact fluoride reactivity and the role of H-bond donors as phase-transfer catalysts to bring solid-phase alkali metal fluorides in solution. These studies led to hydrogen bonding phase-transfer catalysis (HB-PTC), a new concept in PTC, originally crafted for alkali metal fluorides but offering opportunities beyond enantioselective fluorination. Looking ahead, the unlimited options that one can consider to diversify the H-bond donor, the inorganic salt, and the electrophile, herald a new era in phase-transfer catalysis. Whether abundant inorganic salts of lattice energy significantly higher than those studied to date could be considered as nucleophiles, e.g., CaF2, remains an open question, with solutions that may be found through synergistic PTC catalysis or beyond PTC.
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Affiliation(s)
- Gabriele Pupo
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
| | - Véronique Gouverneur
- Chemistry Research Laboratory, University of Oxford, 12 Mansfield Road, Oxford OX1 3TA, U.K
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21
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Ramiharimanana FD, Andrianjafy MT, Ramarosandratana NH, Andrianarijaona TE, Rambala Rakotomena NAH, Metay E, Duclos MC, Cinquin V, Mavingui P, Vestalys Ramanandraibe V, Lemaire M. Chirality Effects on Repellent Properties of 4-Alkoxycoumarins Against Asian Tiger Mosquito (Diptera: Culicidae). JOURNAL OF MEDICAL ENTOMOLOGY 2022; 59:430-439. [PMID: 35039846 DOI: 10.1093/jme/tjab176] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Indexed: 06/14/2023]
Abstract
The use of semiochemicals as repellents and attractants has been proposed to complement insecticides used for the control of vector mosquito populations. In several studies, the optical purities of the molecules tested have been described as having little or no effect on repellent activity. However, these observations seem difficult to explain because of the chirality effect of molecules on the olfactory system of insects and humans. Thus, the purpose of this study is to assess the effects of chirality on the repellent properties of 4-alcoxycoumarins against Aedes albopictus Skuse, mosquito vector of arboviruses. We report here that the racemic (R/S)-4-sec-butoxycoumarin had the highest repellent effect (Repellent Index = 49.9%) followed by (R) enantiomer (Repellent Index = 24.2%) for the dose of 5 mg/mL. Contrary, no significant repellent activity was recorded for S-(+)-4-sec-butoxycoumarin. This experiment demonstrates the close relationship between the molecules' optical purities and the behavioral response of mosquitoes.
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Affiliation(s)
| | - Mbolatiana Tovo Andrianjafy
- International Associated Laboratory, University of Antananarivo-Lyon 1, Antananarivo, Madagascar
- Department of Entomology, University of Antananarivo, Antananarivo, Madagascar
| | - Niry Hasinandrianina Ramarosandratana
- International Associated Laboratory, University of Antananarivo-Lyon 1, Antananarivo, Madagascar
- Department of Entomology, University of Antananarivo, Antananarivo, Madagascar
| | - Toavina Elodie Andrianarijaona
- International Associated Laboratory, University of Antananarivo-Lyon 1, Antananarivo, Madagascar
- Department of Entomology, University of Antananarivo, Antananarivo, Madagascar
| | | | - Estelle Metay
- International Associated Laboratory, University of Antananarivo-Lyon 1, Antananarivo, Madagascar
- ICBMS, CNRS, UMR 5246, University of Claude Bernard Lyon, 1 Rue Victor Grignard, Batiment Lederer, 69622, Villeurbanne Cedex, France
| | - Marie-Christine Duclos
- ICBMS, CNRS, UMR 5246, University of Claude Bernard Lyon, 1 Rue Victor Grignard, Batiment Lederer, 69622, Villeurbanne Cedex, France
| | - Valentin Cinquin
- ICBMS, CNRS, UMR 5246, University of Claude Bernard Lyon, 1 Rue Victor Grignard, Batiment Lederer, 69622, Villeurbanne Cedex, France
| | - Patrick Mavingui
- International Associated Laboratory, University of Antananarivo-Lyon 1, Antananarivo, Madagascar
- University of Reunion, UMR PIMIT, INSERM 1187, CNRS 9192, IRD 249, Plateforme Technologique CYROI, 2 Rue Maxime Rivière Sainte Clotilde, La Réunion, France
| | | | - Marc Lemaire
- International Associated Laboratory, University of Antananarivo-Lyon 1, Antananarivo, Madagascar
- ICBMS, CNRS, UMR 5246, University of Claude Bernard Lyon, 1 Rue Victor Grignard, Batiment Lederer, 69622, Villeurbanne Cedex, France
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22
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Liang H, Li Z, Liu Y, Murayama S, Naka H, Maruoka K. Synthesis of optically pure, deuterated Maruoka Catalysts and their chemical reactivity. Tetrahedron Lett 2022. [DOI: 10.1016/j.tetlet.2022.153753] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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23
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Keenan T, Jean A, Arseniyadis S. Phase-Transfer-Catalyzed Alkylation of Hydantoins. ACS ORGANIC & INORGANIC AU 2022; 2:312-317. [PMID: 36855589 PMCID: PMC9954259 DOI: 10.1021/acsorginorgau.1c00058] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A highly efficient, cost-effective, and environmentally friendly protocol is reported for the C5-selective alkylation of hydantoins under phase-transfer catalysis. The reactions are scalable and only require a catalytic amount of tetrabutylammonium bromide (TBAB) to achieve high yields under mild reaction conditions. Moreover, the method is applicable to a wide range of electrophiles, including alkyl-, allyl-, propargyl-, and benzyl halides, as well as acrylates and dibromoalkanes, but also to virtually any hydantoin precursor. We also highlight the potential for an enantioselective adaptation using a chiral phase-transfer catalyst.
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Affiliation(s)
- Thomas Keenan
- Department
of Chemistry, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.
| | - Alexandre Jean
- Industrial
Research Centre, Oril Industrie, 13 rue Desgenétais, 76210 Bolbec, France,
| | - Stellios Arseniyadis
- Department
of Chemistry, Queen Mary University of London, Mile End Road, London E1 4NS, U.K.,
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24
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Gao M, Li Y, Li X, Hu L. Phase-Transfer-Catalyzed Asymmetric Annulations of Alkyl Dihalides with Oxindoles: Unified Access to Chiral Spirocarbocyclic Oxindoles. Org Lett 2022; 24:875-880. [PMID: 35040655 DOI: 10.1021/acs.orglett.1c04174] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A general phase-transfer-catalyzed asymmetric (n+1) (n = 4 or 5) annulation reaction, featuring the direct coupling of simple oxindoles with alkyl dihalides that are allylic/benzylic and non-allylic/benzylic, has been developed to provide previously inaccessible cyclopentane- and cyclohexane-fused spirooxindole scaffolds with high yields and enantioselectivities (88-95% ee). Along with a broad scope and mild conditions, the new protocol also enables a two-step and gram-scale synthesis of the core of the drug ubrogepant.
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Affiliation(s)
- Min Gao
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, China
| | - Yongyi Li
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, China
| | - Xuemin Li
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, China
| | - Lin Hu
- Chongqing Key Laboratory of Natural Product Synthesis and Drug Research, School of Pharmaceutical Sciences, Chongqing University, Chongqing 401331, China
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25
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Modified Cellulose with BINAP-Supported Rh as an Efficient Heterogeneous Catalyst for Asymmetric Hydrogenation. Catalysts 2022. [DOI: 10.3390/catal12010083] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
Asymmetric catalysis is the preferred method for the synthesis of pure chiral molecules in the fine chemical industry. Cellulose has long been sought as a support in enantioselective catalysis. Dialdehyde cellulose (DAC) is produced by the selective oxidation of cellulose and is used to bind 5,5′-diamino Binap by forming a Schiff base. Here, we report the synthesis of modified cellulose-supported Rh as a novel biomass-supported catalyst and the characterization of its morphology, composition, and thermal stability. DAC-BINAP-Rh was a very effective catalyst in the asymmetric hydrogenation of enamides and could be easily recycled. This work provides a novel supported catalyst that broadens the applications of cellulose in asymmetric catalysis.
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26
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Smajlagic I, White B, Azeez O, Pilkington M, Dudding T. Organocatalysis Linked to Charge-Enhanced Acidity with Superelectrophilic Traits. ACS Catal 2022. [DOI: 10.1021/acscatal.1c05296] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Ivor Smajlagic
- Department of Chemistry, Brock University, St. Catharines L2S 3A1, Canada
| | - Brandon White
- Department of Chemistry, Brock University, St. Catharines L2S 3A1, Canada
| | - Oyindamola Azeez
- Department of Chemistry, Brock University, St. Catharines L2S 3A1, Canada
| | - Melanie Pilkington
- Department of Chemistry, Brock University, St. Catharines L2S 3A1, Canada
| | - Travis Dudding
- Department of Chemistry, Brock University, St. Catharines L2S 3A1, Canada
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27
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Lee G, Lee JH, Lee J, Ha MW, Kim MH, Hong S, Park HG. Asymmetric Epoxidation of Enones: Effect of Surfactants, Radical Scavengers and Morphology of Catalysts on Reaction Rates, Chemical Yields and Enantioselectivities in Phase-Transfer Catalysis. Org Chem Front 2022. [DOI: 10.1039/d2qo00924b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly enantioselective epoxidation of enones has been accomplished with asymmetric phase-transfer catalysis (PTC) using cinchona alkaloid-derived meta-dimer catalysts. An intensive study of structure-reactivity relationships among catalysts and oxidants in terms...
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28
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Gazzeh H, Rouatbi F, Chniti S, Askri M, Knorr M, Strohmann C, Golz C, Lamsabhi AM. Chemoselective and diastereodivergent synthesis of new spirooxindolo-pyrrolizidines and pyrrolidines stemming from unsymmetrical 1,3-bis(arylidene)tetral-2-ones: a combined experimental and theoretical study. NEW J CHEM 2022. [DOI: 10.1039/d2nj03887k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An experimental and theoretical study of an efficient one-pot three-components cycloaddition reaction leading to pentacyclic dispiropyrrolizidin/pyrrolidinoxindoles endowed by four contiguous stereogenic centres with moderate to good yields was reported.
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Affiliation(s)
- Houda Gazzeh
- Laboratory of Heterocyclic Chemistry Natural Product and Reactivity/CHPNR, Department of Chemistry, Faculty of Science of Monastir, 5000 Monastir, Tunisia
| | - Fadwa Rouatbi
- Laboratory of Heterocyclic Chemistry Natural Product and Reactivity/CHPNR, Department of Chemistry, Faculty of Science of Monastir, 5000 Monastir, Tunisia
| | - Sami Chniti
- Laboratory of Heterocyclic Chemistry Natural Product and Reactivity/CHPNR, Department of Chemistry, Faculty of Science of Monastir, 5000 Monastir, Tunisia
| | - Moheddine Askri
- Laboratory of Heterocyclic Chemistry Natural Product and Reactivity/CHPNR, Department of Chemistry, Faculty of Science of Monastir, 5000 Monastir, Tunisia
| | - Michael Knorr
- Institute UTINAM-UMR CNRS 6213, Université de Franche-Comté, 16 Route de Gray, 25030 Besançon, France
| | - Carsten Strohmann
- Technische Universität Dortmund, Anorganische Chemie Otto-Hahn-Strasse 6, 44221 Dortmund, Germany
| | - Christopher Golz
- Georg-August-University Göttingen, Institute of Organic and Biomolecular Chemistry, Tammann-Straße 2, D-37077, Göttingen, Germany
| | - Al Mokhtar Lamsabhi
- Department of Chemistry, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madri, Spain
- Institute for Advanced Research in Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, 28049 Madrid, Spain
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29
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Kolcsár VJ, Szőllősi G. Mechanochemical, Water‐Assisted Asymmetric Transfer Hydrogenation of Ketones Using Ruthenium Catalyst. ChemCatChem 2021. [DOI: 10.1002/cctc.202101501] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
| | - György Szőllősi
- Stereochemistry Research Group Eötvös Loránd Research Network University of Szeged 6720 Szeged, Eötvös utca 6 Hungary
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30
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Pan M, Shao YB, Zhao Q, Li X. Asymmetric Synthesis of N-N Axially Chiral Compounds by Phase-Transfer-Catalyzed Alkylations. Org Lett 2021; 24:374-378. [PMID: 34928616 DOI: 10.1021/acs.orglett.1c04028] [Citation(s) in RCA: 26] [Impact Index Per Article: 8.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
N-N axially chiral skeletons are significant structural motifs in natural products, pharmaceuticals, and functional materials. Herein we disclose a method for the asymmetric synthesis of N-N axially chiral compounds by phase-transfer catalysis. A wide range of N-N axially chiral quinazolinone derivatives were prepared in high yields with excellent stereoselectivities. Furthermore, the synthetic utility of the protocol was proved by large-scale reaction and transformation of the product. Density functional theory calculations provide insight into the mechanism.
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Affiliation(s)
- Ming Pan
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Ying-Bo Shao
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Qun Zhao
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
| | - Xin Li
- State Key Laboratory of Elemento-Organic Chemistry, College of Chemistry, Nankai University, Tianjin 300071, People's Republic of China
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31
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Vinylogous and Arylogous Stereoselective Base-Promoted Phase-Transfer Catalysis. Catalysts 2021. [DOI: 10.3390/catal11121545] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Vinylogous enolate and enolate-type carbanions, generated by deprotonation of α,β-unsaturated compounds and characterized by delocalization of the negative charge over two or more carbon atoms, are extensively used in organic synthesis, enabling functionalization and C–C bond formation at remote positions. Similarly, reactions with electrophiles at benzylic and heterobenzylic position are performed through generation of arylogous and heteroarylogous enolate-type nucleophiles. Although widely exploited in metal-catalysis and organocatalysis, it is only in recent years that the vinylogy and arylogy principles have been translated fruitfully in phase-transfer catalyzed processes. This review provides an overview of the methods developed to date, involving vinylogous and (hetero)arylogous carbon nucleophiles under phase-transfer catalytic conditions, highlighting main mechanistic aspects.
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32
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Ranga PK, Ahmad F, Singh G, Tyagi A, Vijaya Anand R. Recent advances in the organocatalytic applications of cyclopropene- and cyclopropenium-based small molecules. Org Biomol Chem 2021; 19:9541-9564. [PMID: 34704583 DOI: 10.1039/d1ob01549d] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
The development of novel small molecule-based catalysts for organic transformations has increased noticeably in the last two decades. A very recent addition to this particular research area is cyclopropene- and cyclopropenium-based catalysts. At one point in time, particularly in the mid-20th century, much attention was focused on the structural aspects and physical properties of cyclopropene-based compounds. However, a paradigm shift was observed in the late 20th century, and the focus shifted to the synthetic utility of these compounds. In fact, a wide range of cyclopropene derivatives have been found serving as valuable synthons for the construction of carbocycles, heterocycles and other useful organic compounds. In the last few years, the catalytic applications of cyclopropene/cyclopropenium-based compounds have been uncovered and many synthetic protocols have been developed using cyclopropene-based compounds as organocatalysts. Therefore, the main objective of this review is to highlight recent developments in the catalytic applications of cyclopropene-based small molecules in different areas of organocatalysis such as phase-transfer catalysis (PTC), Brønsted base catalysis, hydrogen-bond donor catalysis, nucleophilic carbene catalysis, and electrophotocatalysis developed within the past two decades.
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Affiliation(s)
- Pavit K Ranga
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
| | - Feroz Ahmad
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
| | - Gurdeep Singh
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
| | - Akshi Tyagi
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
| | - Ramasamy Vijaya Anand
- Department of Chemical Sciences, Indian Institute of Science Education and Research (IISER) Mohali, Sector 81, Knowledge City, S.A.S Nagar, Manauli (PO), Punjab - 140306, India.
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33
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Yu L, Liu J, Wang H, Xu L, Wu Y, Zheng C, Zhao G. Asymmetric Dieckmann Condensation towards Spirocyclic Oxindoles Catalyzed by Amino Acid‐Derived Phosphonium Salts. Adv Synth Catal 2021. [DOI: 10.1002/adsc.202101031] [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)
- Longhui Yu
- Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 People's Republic of China
| | - Jun Liu
- Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 People's Republic of China
| | - Hongyu Wang
- Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 People's Republic of China
| | - Lijun Xu
- Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 People's Republic of China
| | - Yufei Wu
- Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 People's Republic of China
| | - Changwu Zheng
- Innovation Research Institute of Traditional Chinese Medicine School of Pharmacy Shanghai University of Traditional Chinese Medicine Shanghai 201203 People's Republic of China
| | - Gang Zhao
- Key Laboratory of Synthetic Chemistry of Natural Substances Shanghai Institute of Organic Chemistry Chinese Academy of Sciences 345 Lingling Road Shanghai 200032 People's Republic of China
- Innovation Research Institute of Traditional Chinese Medicine School of Pharmacy Shanghai University of Traditional Chinese Medicine Shanghai 201203 People's Republic of China
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34
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Fehér Z, Richter D, Nagy S, Bagi P, Rapi Z, Simon A, Drahos L, Huszthy P, Bakó P, Kupai J. Synthesis of Novel Crown Ether-Squaramides and Their Application as Phase-Transfer Catalysts. Molecules 2021; 26:6542. [PMID: 34770950 PMCID: PMC8588334 DOI: 10.3390/molecules26216542] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2021] [Revised: 10/18/2021] [Accepted: 10/27/2021] [Indexed: 11/17/2022] Open
Abstract
This work presents the synthesis of six new phase-transfer organocatalysts in which the squaramide unit is directly linked to the nitrogen atom of an aza-crown ether. Four chiral skeletons, namely hydroquinine, quinine, cinchonine (cinchonas), and α-d-glucopyranoside were responsible for the asymmetric construction of an all-carbon quaternary stereogenic center in α-alkylation and Michael addition reactions of malonic esters. We investigated the effects of these different chiral units and that of crown ethers with different sizes on catalytic activity and enantioselectivity. During extensive parameter investigations, both conventional and emerging green solvents were screened, providing valuable α,α-disubstituted malonic ester derivatives with excellent yields (up to 98%).
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Affiliation(s)
- Zsuzsanna Fehér
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary; (Z.F.); (D.R.); (S.N.); (P.B.); (Z.R.); (P.H.); (P.B.)
| | - Dóra Richter
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary; (Z.F.); (D.R.); (S.N.); (P.B.); (Z.R.); (P.H.); (P.B.)
| | - Sándor Nagy
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary; (Z.F.); (D.R.); (S.N.); (P.B.); (Z.R.); (P.H.); (P.B.)
| | - Péter Bagi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary; (Z.F.); (D.R.); (S.N.); (P.B.); (Z.R.); (P.H.); (P.B.)
| | - Zsolt Rapi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary; (Z.F.); (D.R.); (S.N.); (P.B.); (Z.R.); (P.H.); (P.B.)
| | - András Simon
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary;
| | - László Drahos
- MS Proteomics Research Group, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar Tudósok körútja 2, H-1117 Budapest, Hungary;
| | - Péter Huszthy
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary; (Z.F.); (D.R.); (S.N.); (P.B.); (Z.R.); (P.H.); (P.B.)
| | - Péter Bakó
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary; (Z.F.); (D.R.); (S.N.); (P.B.); (Z.R.); (P.H.); (P.B.)
| | - József Kupai
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szent Gellért tér 4, H-1111 Budapest, Hungary; (Z.F.); (D.R.); (S.N.); (P.B.); (Z.R.); (P.H.); (P.B.)
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35
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Zebrowski P, Eder I, Eitzinger A, Mallojjala SC, Waser M. Enantioselective Catalytic Synthesis of α-Halogenated α-Aryl-β 2,2-amino Acid Derivatives. ACS ORGANIC & INORGANIC AU 2021; 2:34-43. [PMID: 35141714 PMCID: PMC8815071 DOI: 10.1021/acsorginorgau.1c00025] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/30/2021] [Revised: 09/13/2021] [Accepted: 09/13/2021] [Indexed: 01/22/2023]
Abstract
The enantioselective synthesis of a broad variety of novel differently functionalized α-halogenated α-aryl-β2,2-amino acid derivatives by means of an ammonium-salt-catalyzed asymmetric α-halogenation of isoxazolidin-5-ones was accomplished. Key to success to obtain high levels of enantioselectivities was the use of Maruoka's spirocyclic binaphthyl-based ammonium salts, and detailed accompanying mechanistic studies using density functional theory methods revealed the key features for the catalyst-substrate interactions.
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Affiliation(s)
- Paul Zebrowski
- Institute
of Organic Chemistry, Johannes Kepler University
Linz, Altenbergerstrasse 69, 4040 Linz, Austria
| | - Isabella Eder
- Institute
of Organic Chemistry, Johannes Kepler University
Linz, Altenbergerstrasse 69, 4040 Linz, Austria
| | - Andreas Eitzinger
- Institute
of Organic Chemistry, Johannes Kepler University
Linz, Altenbergerstrasse 69, 4040 Linz, Austria
| | - Sharath Chandra Mallojjala
- Department
of Chemistry, State University of New York
at Binghamton, Binghamton, New York 13902, United States,
| | - Mario Waser
- Institute
of Organic Chemistry, Johannes Kepler University
Linz, Altenbergerstrasse 69, 4040 Linz, Austria,Phone: +4373224685411.
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36
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Ma Y, Woltornist RA, Algera RF, Collum DB. Reactions of Sodium Diisopropylamide: Liquid-Phase and Solid-Liquid Phase-Transfer Catalysis by N, N, N', N″, N″-Pentamethyldiethylenetriamine. J Am Chem Soc 2021; 143:13370-13381. [PMID: 34375095 PMCID: PMC10042303 DOI: 10.1021/jacs.1c06528] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Sodium diisopropylamide (NaDA) in N,N-dimethylethylamine (DMEA) and DMEA-hydrocarbon mixtures with added N,N,N',N″,N″-pentamethyldiethylenetriamine (PMDTA) reacts with alkyl halides, epoxides, hydrazones, arenes, alkenes, and allyl ethers. Comparisons of PMDTA with N,N,N',N'-tetramethylethylenediamine (TMEDA) accompanied by detailed rate and computational studies reveal the importance of the trifunctionality and κ2-κ3 hemilability. Rate studies show exclusively monomer-based reactions of 2-bromooctane, cyclooctene oxide, and dimethylresorcinol. Catalysis with 10 mol % PMDTA shows up to >30-fold accelerations (kcat > 300) with no evidence of inhibition over 10 turnovers. Solid-liquid phase-transfer catalysis (SLPTC) is explored as a means to optimize the catalysis as well as explore the merits of heterogeneous reaction conditions.
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Affiliation(s)
- Yun Ma
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853–1301
| | - Ryan A. Woltornist
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853–1301
| | - Russell F. Algera
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853–1301
| | - David B. Collum
- Department of Chemistry and Chemical Biology, Baker Laboratory, Cornell University, Ithaca, New York 14853–1301
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37
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Röser K, Berger B, Widhalm M, Waser M. Enantioselective Synthesis of Acyclic Orthogonally Functionalized Compounds Bearing a Quaternary Stereocenter Using Chiral Ammonium Salt Catalysis. ChemistryOpen 2021; 10:756-759. [PMID: 34351087 PMCID: PMC8340069 DOI: 10.1002/open.202100162] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2021] [Revised: 07/09/2021] [Indexed: 11/29/2022] Open
Abstract
We herein report an asymmetric protocol to access a series of orthogonally functionalized acyclic chiral target molecules containing a quaternary stereogenic center by carrying out the enantioselective α-alkylation of novel orthogonally functionalized dioxolane-containing cyanoacetates under chiral ammonium salt catalysis. By using just 1 mol % of Maruoka's spirocyclic ammonium salt catalysts enantioselectivities up to e.r.=97.5 : 2.5 could be achieved and further functional group manipulations of the products were carried out as well.
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Affiliation(s)
- Katharina Röser
- Johannes Kepler University LinzInstitute of Organic ChemistryAltenbergerstraße 694040LinzAustria
| | - Bettina Berger
- University of ViennaInstitute of Chemical CatalysisWähringer Strasse 381090ViennaAustria
| | - Michael Widhalm
- University of ViennaInstitute of Chemical CatalysisWähringer Strasse 381090ViennaAustria
| | - Mario Waser
- Johannes Kepler University LinzInstitute of Organic ChemistryAltenbergerstraße 694040LinzAustria
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38
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Chen L, Geng HY, Chen ZJ, Liang W, Jiao WY. Rapid entry to bispiro heterocycles merging five pharmacophores using phase-transfer catalysis. Tetrahedron Lett 2021. [DOI: 10.1016/j.tetlet.2021.153276] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
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39
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Antenucci A, Dughera S, Renzi P. Green Chemistry Meets Asymmetric Organocatalysis: A Critical Overview on Catalysts Synthesis. CHEMSUSCHEM 2021; 14:2785-2853. [PMID: 33984187 PMCID: PMC8362219 DOI: 10.1002/cssc.202100573] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 04/30/2021] [Indexed: 05/30/2023]
Abstract
Can green chemistry be the right reading key to let organocatalyst design take a step forward towards sustainable catalysis? What if the intriguing chemistry promoted by more engineered organocatalysts was carried on by using renewable and naturally occurring molecular scaffolds, or at least synthetic catalysts more respectful towards the principles of green chemistry? Within the frame of these questions, this Review will tackle the most commonly occurring organic chiral catalysts from the perspective of their synthesis rather than their employment in chemical methodologies or processes. A classification of the catalyst scaffolds based on their E factor will be provided, and the global E factor (EG factor) will be proposed as a new green chemistry metric to consider, also, the synthetic route to the catalyst within a given organocatalytic process.
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Affiliation(s)
- Achille Antenucci
- Department of ChemistryUniversity of TurinVia Pietro Giuria, 710125TurinItaly
- NIS Interdeprtmental CentreINSTM Reference CentreUniversity of TurinVia Gioacchino Quarello 15/A10135TurinItaly
| | - Stefano Dughera
- Department of ChemistryUniversity of TurinVia Pietro Giuria, 710125TurinItaly
| | - Polyssena Renzi
- Department of ChemistryUniversity of TurinVia Pietro Giuria, 710125TurinItaly
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40
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Oh J, Park J, Nahm K. Counter-rotatable dual cinchona quinuclidinium salts and their phase transfer catalysis in enantioselective alkylation of glycine imines. Chem Commun (Camb) 2021; 57:6816-6819. [PMID: 34151341 DOI: 10.1039/d1cc02785a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Dual cinchona quinuclidinium salts with a diphenyl ether linker were synthesized and used as powerful asymmetric phase transfer catalysts in the α-alkylation of imines of glycine and alanine ester with 0.01-0.1 mol% loading (17 examples, 92-99% ee). Skewed conformers of dual quinuclidiniums at TS were proposed to rationalize their high efficiency via DFT calculations.
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Affiliation(s)
- Jiin Oh
- School of Chemistry and Biochemistry, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
| | - Jihyeon Park
- School of Chemistry and Biochemistry, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
| | - Keepyung Nahm
- School of Chemistry and Biochemistry, Yeungnam University, 280 Daehak-Ro, Gyeongsan, Gyeongbuk 38541, Republic of Korea.
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41
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Eitzinger A, Otevrel J, Haider V, Macchia A, Massa A, Faust K, Spingler B, Berkessel A, Waser M. Enantioselective Bifunctional Ammonium Salt-Catalyzed Syntheses of 3-CF 3S-, 3-RS-, and 3-F-Substituted Isoindolinones. Adv Synth Catal 2021; 363:1955-1962. [PMID: 33897314 PMCID: PMC8050839 DOI: 10.1002/adsc.202100029] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 02/09/2021] [Indexed: 01/12/2023]
Abstract
We herein report the ammonium salt-catalyzed synthesis of chiral 3,3-disubstituted isoindolinones bearing a heteroatom functionality in the 3-position. A broad variety of differently substituted CF3S- and RS-derivatives were obtained with often high enantioselectivities when using Maruoka's bifunctional chiral ammonium salt catalyst. In addition, a first proof-of-concept for the racemic synthesis of the analogous F-containing products was obtained as well, giving access to one of the rare examples of a fairly stable α-F-α-amino acid derivative.
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Affiliation(s)
- Andreas Eitzinger
- Institute of Organic ChemistryJohannes Kepler University LinzAltenbergerstr. 694040LinzAustria
| | - Jan Otevrel
- Institute of Organic ChemistryJohannes Kepler University LinzAltenbergerstr. 694040LinzAustria
- Department of Chemical DrugsFaculty of PharmacyMasaryk UniversityPalackeho 1946/1612 00BrnoCzechia
| | - Victoria Haider
- Institute of Organic ChemistryJohannes Kepler University LinzAltenbergerstr. 694040LinzAustria
| | - Antonio Macchia
- Dipartimento di Chimica e BiologiaUniversità di SalernoVia Giovanni Paolo II, 13284084FiscianoSAItaly
| | - Antonio Massa
- Dipartimento di Chimica e BiologiaUniversità di SalernoVia Giovanni Paolo II, 13284084FiscianoSAItaly
| | - Kirill Faust
- Institute of CatalysisJohannes Kepler University LinzAltenbergerstr. 694040LinzAustria
| | - Bernhard Spingler
- Department of ChemistryUniversity of ZurichWinterthurerstrasse 1908057ZurichSwitzerland
| | - Albrecht Berkessel
- Department of ChemistryCologne UniversityGreinstrasse 450939CologneGermany
| | - Mario Waser
- Institute of Organic ChemistryJohannes Kepler University LinzAltenbergerstr. 694040LinzAustria
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42
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Gao Z, Qian J, Yang H, Zhang J, Jiang G. Enantioselective Construction of C-C Axially Chiral Quinazolinones via Chirality Exchange and Phase-Transfer Catalysis. Org Lett 2021; 23:1731-1737. [PMID: 33586979 DOI: 10.1021/acs.orglett.1c00156] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A family of axially chiral quinazolinone-based heterobiaryls were constructed with high levels of enantiocontrol (up to 94% ee). Convergently, three different synthetic methods have been realized to prepare these valuable compounds including central-to-axial chirality transfer, dynamic kinetic resolution, and phase-transfer catalysis. Importantly, novel P,N-ligands with a π-π stacking can be derived from heterobiaryls by chirality exchange strategy or synthesized directly from complementary phase-transfer catalysis by using the inexpensive chiral quaternary ammonium salt.
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Affiliation(s)
- Zeng Gao
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, China.,University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Jinlong Qian
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - Huameng Yang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - Jinlong Zhang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, China
| | - Gaoxi Jiang
- State Key Laboratory for Oxo Synthesis and Selective Oxidation, Center for Excellence in Molecular Synthesis, Suzhou Research Institute of LICP, Lanzhou Institute of Chemical Physics (LICP), Chinese Academy of Sciences, Lanzhou 730000, China
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43
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Saini P, Sonika, Singh G, Kaur G, Singh J, Singh H. Robust and Versatile Cu(I) metal frameworks as potential catalysts for azide-alkyne cycloaddition reactions: Review. MOLECULAR CATALYSIS 2021. [DOI: 10.1016/j.mcat.2021.111432] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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44
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Tyszka-Gumkowska A, Jurczak J. Divergent synthesis of pyrrolidine and glutamic acid derivatives using a macrocyclic phase-transfer catalyst under high-pressure conditions. Org Chem Front 2021. [DOI: 10.1039/d1qo01198g] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The reactivity of the glycine ketimine ester with α,β-unsaturated ketones in the presence of macrocyclic hybrid phase-transfer catalysts under high pressure conditions has been investigated.
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Affiliation(s)
- Agata Tyszka-Gumkowska
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Janusz Jurczak
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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45
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Nishimoto Y, Fujie M, Hara J, Yasuda M. Effect of noncovalent interactions in ion pairs on hypervalent iodines: inversion of regioselectivity in sulfonyloxylactonization. Org Chem Front 2021. [DOI: 10.1039/d1qo00523e] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The noncovalent interactions between the sulfonyloxy group and the cationic nitrogen-containing heterocyclic moiety substituted in hypervalent iodines caused specific regioselectivity in the sulfonyloxylactonization of 2-vinyl benzoic acids.
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Affiliation(s)
- Yoshihiro Nishimoto
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
| | - Masaki Fujie
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
| | - Junki Hara
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
| | - Makoto Yasuda
- Department of Applied Chemistry
- Graduate School of Engineering
- Osaka University
- Osaka 565-0871
- Japan
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46
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Fan R, Tan C, Liu Y, Wei Y, Zhao X, Liu X, Tan J, Yoshida H. A leap forward in sulfonium salt and sulfur ylide chemistry. CHINESE CHEM LETT 2021. [DOI: 10.1016/j.cclet.2020.06.003] [Citation(s) in RCA: 38] [Impact Index Per Article: 12.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
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47
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Jiang Y, McNamee RE, Smith PJ, Sozanschi A, Tong Z, Anderson EA. Advances in polycyclization cascades in natural product synthesis. Chem Soc Rev 2021; 50:58-71. [DOI: 10.1039/d0cs00768d] [Citation(s) in RCA: 22] [Impact Index Per Article: 7.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
Abstract
Cascade reactions are among the most powerful means to achieve the construction of multiple ring systems in a single step. This tutorial review describes recent advances in the use of polycyclization cascades in natural product synthesis.
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Affiliation(s)
- Yubo Jiang
- Chemistry Research Laboratory
- Oxford
- UK
- Faculty of Science
- Kunming University of Science and Technology
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48
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Chen Z, Liang W, Chen Z, Chen L. Phase‐Transfer Catalytic Strategy: Rapid Synthesis of Spiro‐Fused Heterocycles, Integrated with Four Pharmacophores‐Succinimide, Pyrrolidine, Oxindole, and Trifluoromethyl Group. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001409] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Zheng‐Jun Chen
- School of Chemistry and Materials Science Guizhou Normal University 116 Baoshan North Road Guiyang P. R. of China
| | - Wei Liang
- School of Chemistry and Materials Science Guizhou Normal University 116 Baoshan North Road Guiyang P. R. of China
| | - Zhuo Chen
- School of Chemistry and Materials Science Guizhou Normal University 116 Baoshan North Road Guiyang P. R. of China
| | - Lin Chen
- School of Chemistry and Materials Science Guizhou Normal University 116 Baoshan North Road Guiyang P. R. of China
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49
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Abstract
After short historical introduction, interfacial mechanism of phase transfer catalyzed (PTC) reactions of organic anions, induced by aqueous NaOH or KOH in two-phase systems is formulated. Subsequently experimental evidence that supports the interfacial deprotonation as the key initial step of these reactions is presented.
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50
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Majdecki M, Tyszka-Gumkowska A, Jurczak J. Highly Enantioselective Epoxidation of α,β-Unsaturated Ketones Using Amide-Based Cinchona Alkaloids as Hybrid Phase-Transfer Catalysts. Org Lett 2020; 22:8687-8691. [PMID: 33112627 PMCID: PMC7660942 DOI: 10.1021/acs.orglett.0c03272] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Abstract
![]()
A series of 20 one chiral epoxides
were obtained with excellent
yields (up to 99%) and enantioselectivities (up to >99% ee) using
hybrid amide-based Cinchona alkaloids. Our method
is characterized by low catalyst loading (0.5 mol %) and short reaction
times. Moreover, the epoxidation process can be carried out in 10
cycles, without further catalyst addition to the reaction mixture.
This methodology significantly enhance the scale of the process using
very low catalyst loading.
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Affiliation(s)
- Maciej Majdecki
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Agata Tyszka-Gumkowska
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
| | - Janusz Jurczak
- Institute of Organic Chemistry, Polish Academy of Sciences, Kasprzaka 44/52, 01-224 Warsaw, Poland
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