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Sudarikov DV, Nikitina LE, Rollin P, Izmest’ev ES, Rubtsova SA. Monoterpene Thiols: Synthesis and Modifications for Obtaining Biologically Active Substances. Int J Mol Sci 2023; 24:15884. [PMID: 37958865 PMCID: PMC10649346 DOI: 10.3390/ijms242115884] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Revised: 10/26/2023] [Accepted: 10/30/2023] [Indexed: 11/15/2023] Open
Abstract
Monoterpene thiols are one of the classes of natural flavors that impart the smell of citrus fruits, grape must and wine, black currants, and guava and are used as flavoring agents in the food and perfume industries. Synthetic monoterpene thiols have found an application in asymmetric synthesis as chiral auxiliaries, derivatizing agents, and ligands for metal complex catalysis and organocatalysts. Since monoterpenes and monoterpenoids are a renewable source, there are emerging trends to use monoterpene thiols as monomers for producing new types of green polymers. Monoterpene thioderivatives are also known to possess antioxidant, anticoagulant, antifungal, and antibacterial activity. The current review covers methods for the synthesis of acyclic, mono-, and bicyclic monoterpene thiols, as well as some investigations related to their usage for the preparation of the compounds with antimicrobial properties.
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Affiliation(s)
- Denis V. Sudarikov
- Institute of Chemistry, Federal Research Center “Komi Scientific Center”, Ural Branch, Russian Academy of Sciences, 167000 Syktyvkar, Russia; (E.S.I.); (S.A.R.)
| | - Liliya E. Nikitina
- General and Organic Chemistry Department, Kazan State Medical University, 49 Butlerov St., 420012 Kazan, Russia;
| | - Patrick Rollin
- Institute of Organic and Analytical Chemistry (ICOA), Université d’Orléans et the French National Center for Scientific Research (CNRS), UMR 7311, BP 6759, F-45067 Orléans, France;
| | - Evgeniy S. Izmest’ev
- Institute of Chemistry, Federal Research Center “Komi Scientific Center”, Ural Branch, Russian Academy of Sciences, 167000 Syktyvkar, Russia; (E.S.I.); (S.A.R.)
| | - Svetlana A. Rubtsova
- Institute of Chemistry, Federal Research Center “Komi Scientific Center”, Ural Branch, Russian Academy of Sciences, 167000 Syktyvkar, Russia; (E.S.I.); (S.A.R.)
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2
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Yan XX, Lu WX, Mao JG, Xing J, Tang HY, Huang SY, Jiang W. Palladium-Catalyzed Direct Esterification via C-H Bond Activation of Aldehydes. J Org Chem 2023. [PMID: 37307498 DOI: 10.1021/acs.joc.3c00729] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
A concise and highly efficient synthesis method of direct esterification of aldehydes via Pd-catalyzed C-H bond activation of aldehyde group has been developed. The strategy avoids the preoxidation step of aldehyde or use of condensing agents in ester synthesis, which is not only applicable to various alcohols but also suitable for the esterification of phenolics which are usually difficult to be esterified. The methodology has the significant advantages of broad substrate scope, mild reaction conditions, and nonrequirement of additional oxidants.
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Affiliation(s)
- Xiao-Xiao Yan
- School of Chemistry and Chemical Engineering, Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, 156 Kejia Avenue, Ganzhou 341000, P. R. China
| | - Wen-Xiu Lu
- School of Chemistry and Chemical Engineering, Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, 156 Kejia Avenue, Ganzhou 341000, P. R. China
| | - Jian-Gang Mao
- School of Chemistry and Chemical Engineering, Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, 156 Kejia Avenue, Ganzhou 341000, P. R. China
| | - Jian Xing
- School of Chemistry and Chemical Engineering, Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, 156 Kejia Avenue, Ganzhou 341000, P. R. China
| | - Hong-Yu Tang
- School of Chemistry and Chemical Engineering, Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, 156 Kejia Avenue, Ganzhou 341000, P. R. China
| | - Shu-Yi Huang
- School of Chemistry and Chemical Engineering, Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, 156 Kejia Avenue, Ganzhou 341000, P. R. China
| | - Wen Jiang
- School of Chemistry and Chemical Engineering, Jiangxi Provincial Key Laboratory of Functional Molecular Materials Chemistry, Jiangxi University of Science and Technology, 156 Kejia Avenue, Ganzhou 341000, P. R. China
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Stereoselective Synthesis of 2-Deoxythiosugars from Glycals. Molecules 2022; 27:molecules27227979. [PMID: 36432078 PMCID: PMC9696349 DOI: 10.3390/molecules27227979] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Revised: 11/14/2022] [Accepted: 11/15/2022] [Indexed: 11/19/2022] Open
Abstract
2-deoxythiosugars are more stable than 2-deoxysugars occurring broadly in bioactive natural products and pharmaceutical agents. An effective and direct methodology to stereoselectively synthesize α-2-deoxythioglycosides catalyzed by AgOTf has been developed. Various alkyl thiols and thiophenols were explored and the desired products were formed in good yields with excellent α-selectivity. This method was further applied to the syntheses of S-linked disaccharides and late-stage 2-deoxyglycosylation of estrogen, L-menthol, and zingerone thiols successfully.
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Chang ZX, Gong FY, Wang X, Zhang T, Han J, Li HS. Rhodium-Catalyzed Regioselective Formal Hydroacylation of Vinyl Epoxides toward Esters Involving β-Carbon Cleavage. Org Lett 2021; 23:6084-6089. [PMID: 34286983 DOI: 10.1021/acs.orglett.1c02153] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Herein we disclose the first example of the formal hydroacylation reactions of vinyl epoxides with chelating aldehydes enabled by rhodium catalysis for the efficient construction of functionalized esters. Detailed investigations of the mechanistic pathway reveal that the presence of a 2-vinyl group is essential in contributing to the success of this regioselective reaction, which might proceed through β-carbon cleavage as the key procedure.
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Affiliation(s)
- Zhi-Xin Chang
- Institute of Pharmacology, School of Pharmaceutical Sciences, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian 271016, P. R. China
| | - Fei-Yuan Gong
- Institute of Pharmacology, School of Pharmaceutical Sciences, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian 271016, P. R. China
| | - Xiaodan Wang
- Institute of Pharmacology, School of Pharmaceutical Sciences, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian 271016, P. R. China
| | - Tongbo Zhang
- Beijing Pharmaceutical Research Institute, Heilongjiang ZBD Pharmaceutical Co., Ltd., Beijing 101102, P. R. China
| | - Junfen Han
- Institute of Pharmacology, School of Pharmaceutical Sciences, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian 271016, P. R. China
| | - Hong-Shuang Li
- Institute of Pharmacology, School of Pharmaceutical Sciences, Shandong First Medical University & Shandong Academy of Medical Sciences, Taian 271016, P. R. China
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5
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Kopp N, Civenni G, Marson D, Laurini E, Pricl S, Catapano CV, Humpf HU, Almansa C, Nieto FR, Schepmann D, Wünsch B. Chemoenzymatic synthesis of 2,6-disubstituted tetrahydropyrans with high σ 1 receptor affinity, antitumor and analgesic activity. Eur J Med Chem 2021; 219:113443. [PMID: 33901806 DOI: 10.1016/j.ejmech.2021.113443] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2021] [Revised: 03/22/2021] [Accepted: 03/29/2021] [Indexed: 02/06/2023]
Abstract
1,3-Dioxanes 1 and cyclohexanes 2 bearing a phenyl ring and an aminoethyl moiety in 1,3-relationship to each other represent highly potent σ1 receptor antagonists. In order to increase the chemical stability of the acetalic 1,3-dioxanes 1 and the polarity of the cyclohexanes 2, tetrahydropyran derivatives 3 equipped with the same substituents were designed, synthesized and pharmacologically evaluated. The key step of the synthesis was a lipase-catalyzed enantioselective acetylation of the alcohol (R)-5 leading finally to enantiomerically pure test compounds 3a-g. With respect to σ1 receptor affinity and selectivity over a broad range of related (σ2, PCP binding site) and further targets, the enantiomeric benzylamines 3a and cyclohexylmethylamines 3b represent the most promising drug candidates of this series. However, the eudismic ratio for σ1 binding is only in the range of 2.5-3.3. Classical molecular dynamics (MD) simulations confirmed the same binding pose for both the tetrahydropyran 3 and cyclohexane derivatives 2 at the σ1 receptor, according to which: i) the protonated amino moiety of (2S,6R)-3a engages the same key polar interactions with Glu172 (ionic) and Phe107 (π-cation), ii) the lipophilic parts of (2S,6R)-3a are hosted in three hydrophobic regions of the σ1 receptor, and iii) the O-atom of the tetrahydropyran derivatives 3 does not show a relevant interaction with the σ1 receptor. Further in silico evidences obtained by the application of free energy perturbation and steered MD techniques fully supported the experimentally observed difference in receptor/ligand affinities. Tetrahydropyrans 3 require a lower dissociative force peak than cyclohexane analogs 2. Enantiomeric benzylamines 3a and cyclohexylmethylamines 3b were able to inhibit the growth of the androgen negative human prostate cancer cell line DU145. The cyclohexylmethylamine (2S,6R)-3b showed the highest σ1 affinity (Ki(σ1) = 0.95 nM) and the highest analgesic activity in vivo (67%).
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Affiliation(s)
- Nicole Kopp
- Institut für Pharmazeutische und Medizinische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 48, D-48149, Münster, Germany
| | - Gianluca Civenni
- Institute of Oncology Research, Università della Svizzera Italiana (USI), Via Vincenzo Vela 6, CH-6500, Bellinzona, Switzerland
| | - Domenico Marson
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTS), DEA, University of Trieste, 34127, Trieste, Italy
| | - Erik Laurini
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTS), DEA, University of Trieste, 34127, Trieste, Italy
| | - Sabrina Pricl
- Molecular Biology and Nanotechnology Laboratory (MolBNL@UniTS), DEA, University of Trieste, 34127, Trieste, Italy; Department of General Biophysics, Faculty of Biology and Environmental Protection, University of Lodz, Lodz, Poland
| | - Carlo V Catapano
- Institute of Oncology Research, Università della Svizzera Italiana (USI), Via Vincenzo Vela 6, CH-6500, Bellinzona, Switzerland
| | - Hans-Ulrich Humpf
- Institut für Lebensmittelchemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 45, D-48149, Münster, Germany
| | - Carmen Almansa
- Esteve Pharmaceuticals S.A., Baldiri Reixach 4-8, 08028, Barcelona, Spain
| | - Francisco Rafael Nieto
- Department of Pharmacology and Neurosciences Institute (Biomedical Research Center), University of Granada and Biosanitary Research Institute, 18010, Granada, Spain
| | - Dirk Schepmann
- Institut für Pharmazeutische und Medizinische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 48, D-48149, Münster, Germany
| | - Bernhard Wünsch
- Institut für Pharmazeutische und Medizinische Chemie, Westfälische Wilhelms-Universität Münster, Corrensstraße 48, D-48149, Münster, Germany; GRK 2515, Chemical Biology of Ion Channels (Chembion), Westfälische Wilhelms-Universität Münster, Germany.
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6
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Parker PD, Hou X, Dong VM. Reducing Challenges in Organic Synthesis with Stereoselective Hydrogenation and Tandem Catalysis. J Am Chem Soc 2021; 143:6724-6745. [PMID: 33891819 DOI: 10.1021/jacs.1c00750] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Tandem catalysis enables the rapid construction of complex architectures from simple building blocks. This Perspective shares our interest in combining stereoselective hydrogenation with transformations such as isomerization, oxidation, and epimerization to solve diverse challenges. We highlight the use of tandem hydrogenation for preparing complex natural products from simple prochiral building blocks and present tandem catalysis involving transfer hydrogenation and dynamic kinetic resolution. Finally, we underline recent breakthroughs and opportunities for asymmetric hydrogenation.
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Affiliation(s)
- Patrick D Parker
- Department of Chemistry, University of California, Irvine, California 92697, United States
| | - Xintong Hou
- Department of Chemistry, University of California, Irvine, California 92697, United States
| | - Vy M Dong
- Department of Chemistry, University of California, Irvine, California 92697, United States
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7
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Davison RT, Kuker EL, Dong VM. Teaching Aldehydes New Tricks Using Rhodium- and Cobalt-Hydride Catalysis. Acc Chem Res 2021; 54:1236-1250. [PMID: 33533586 DOI: 10.1021/acs.accounts.0c00771] [Citation(s) in RCA: 29] [Impact Index Per Article: 9.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
By using transition metal catalysts, chemists have altered the "logic of chemical synthesis" by enabling the functionalization of carbon-hydrogen bonds, which have traditionally been considered inert. Within this framework, our laboratory has been fascinated by the potential for aldehyde C-H bond activation. Our approach focused on generating acyl-metal-hydrides by oxidative addition of the formyl C-H bond, which is an elementary step first validated by Tsuji in 1965. In this Account, we review our efforts to overcome limitations in hydroacylation. Initial studies resulted in new variants of hydroacylation and ultimately spurred the development of related transformations (e.g., carboacylation, cycloisomerization, and transfer hydroformylation).Sakai and co-workers demonstrated the first hydroacylation of olefins when they reported that 4-pentenals cyclized to cyclopentanones, using stoichiometric amounts of Wilkinson's catalyst. This discovery sparked significant interest in hydroacylation, especially for the enantioselective and catalytic construction of cyclopentanones. Our research focused on expanding the asymmetric variants to access medium-sized rings (e.g., seven- and eight-membered rings). In addition, we achieved selective intermolecular couplings by incorporating directing groups onto the olefin partner. Along the way, we identified Rh and Co catalysts that transform dienyl aldehydes into a variety of unique carbocycles, such as cyclopentanones, bicyclic ketones, cyclohexenyl aldehydes, and cyclobutanones. Building on the insights gained from olefin hydroacylation, we demonstrated the first highly enantioselective hydroacylation of carbonyls. For example, we demonstrated that ketoaldehydes can cyclize to form lactones with high regio- and enantioselectivity. Following these reports, we reported the first intermolecular example that occurs with high stereocontrol. Ketoamides undergo intermolecular carbonyl hydroacylation to furnish α-acyloxyamides that contain a depsipeptide linkage.Finally, we describe how the key acyl-metal-hydride species can be diverted to achieve a C-C bond-cleaving process. Transfer hydroformylation enables the preparation of olefins from aldehydes by a dehomologation mechanism. Release of ring strain in the olefin acceptor offers a driving force for the isodesmic transfer of CO and H2. Mechanistic studies suggest that the counterion serves as a proton-shuttle to enable transfer hydroformylation. Collectively, our studies showcase how transition metal catalysis can transform a common functional group, in this case aldehydes, into structurally distinct motifs. Fine-tuning the coordination sphere of an acyl-metal-hydride species can promote C-C and C-O bond-forming reactions, as well as C-C bond-cleaving processes.
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Affiliation(s)
- Ryan T. Davison
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Erin L. Kuker
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
| | - Vy M. Dong
- Department of Chemistry, University of California, Irvine, Irvine, California 92697, United States
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8
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Tassano E, Merusic K, Buljubasic I, Laggner O, Reiter T, Vogel A, Hall M. Regioselective biocatalytic self-sufficient Tishchenko-type reaction via formal intramolecular hydride transfer. Chem Commun (Camb) 2020; 56:6340-6343. [PMID: 32391538 DOI: 10.1039/d0cc02509g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A self-sufficient nicotinamide-dependent intramolecular bio-Tishchenko-type reaction was developed. The reaction is catalyzed by alcohol dehydrogenases and proceeds through formal intramolecular hydride transfer on dialdehydes to deliver lactones. Regioselectivity on [1,1'-biphenyl]-2,2'-dicarbaldehyde substrates could be controlled via the electronic properties of the substituents. Preparative scale synthesis provided access to substituted dibenzo[c,e]oxepin-5(7H)-ones.
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Affiliation(s)
- Erika Tassano
- Department of Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria.
| | - Kemal Merusic
- Department of Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria.
| | - Isa Buljubasic
- Department of Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria.
| | - Olivia Laggner
- Department of Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria.
| | - Tamara Reiter
- Department of Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria.
| | - Andreas Vogel
- c-LEcta GmbH, Perlickstrasse 5, 04103 Leipzig, Germany
| | - Mélanie Hall
- Department of Chemistry, University of Graz, Heinrichstrasse 28, 8010 Graz, Austria.
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Haydl AM, Berthold D, Spreider PA, Breit B. Stereodivergent and Protecting-Group-Free Synthesis of the Helicascolide Family: A Rhodium-Catalyzed Atom-Economical Lactonization Strategy. Angew Chem Int Ed Engl 2016; 55:5765-9. [DOI: 10.1002/anie.201600632] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2016] [Indexed: 11/12/2022]
Affiliation(s)
- Alexander M. Haydl
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstrasse 21 79104 Freiburg im Breisgau Germany
| | - Dino Berthold
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstrasse 21 79104 Freiburg im Breisgau Germany
| | - Pierre A. Spreider
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstrasse 21 79104 Freiburg im Breisgau Germany
| | - Bernhard Breit
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstrasse 21 79104 Freiburg im Breisgau Germany
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Haydl AM, Berthold D, Spreider PA, Breit B. Stereodivergent and Protecting-Group-Free Synthesis of the Helicascolide Family: A Rhodium-Catalyzed Atom-Economical Lactonization Strategy. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201600632] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Alexander M. Haydl
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstrasse 21 79104 Freiburg im Breisgau Germany
| | - Dino Berthold
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstrasse 21 79104 Freiburg im Breisgau Germany
| | - Pierre A. Spreider
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstrasse 21 79104 Freiburg im Breisgau Germany
| | - Bernhard Breit
- Institut für Organische Chemie; Albert-Ludwigs-Universität Freiburg; Albertstrasse 21 79104 Freiburg im Breisgau Germany
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11
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Hu Y, Li Y, Zhang S, Li C, Li L, Zha Z, Wang Z. Copper Catalyzed Enantioselective Alkylation of Pyrrole with β,γ-Unsaturated α-Ketoesters: Application to One-Pot Construction of the Seven-Membered Ring by Merging a Gold Catalysis. Org Lett 2015; 17:4018-21. [PMID: 26241822 DOI: 10.1021/acs.orglett.5b01917] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
A highly enantioselective Friedel-Crafts alkylation of pyrrole to β,γ-unsaturated α-ketoesters was developed by virtue of a chiral copper complex, affording the alkylated derivatives of pyrrole with good yields and excellent enantioselectivities. Moreover, merging copper catalysis with gold catalysis realized a one-pot construction of the seven-membered ring to give annulated pyrroles with moderate to good yields and high enantiomeric excesses.
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12
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Hoshimoto Y, Ohashi M, Ogoshi S. Catalytic Transformation of Aldehydes with Nickel Complexes through η(2) Coordination and Oxidative Cyclization. Acc Chem Res 2015; 48:1746-55. [PMID: 25955708 DOI: 10.1021/acs.accounts.5b00061] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Chemists no longer doubt the importance of a methodology that could activate and utilize aldehydes in organic syntheses since many products prepared from them support our daily life. Tremendous effort has been devoted to the development of these methods using main-group elements and transition metals. Thus, many organic chemists have used an activator-(aldehyde oxygen) interaction, namely, η(1) coordination, whereby a Lewis or Brønsted acid activates an aldehyde. In the field of coordination chemistry, η(2) coordination of aldehydes to transition metals by coordination of a carbon-oxygen double bond has been well-studied; this activation mode, however, is rarely found in transition-metal catalysis. In view of the distinctive reactivity of an η(2)-aldehyde complex, unprecedented reactions via this intermediate are a distinct possibility. In this Account, we summarize our recent results dealing with nickel(0)-catalyzed transformations of aldehydes via η(2)-aldehyde nickel and oxanickelacycle intermediates. The combination of electron-rich nickel(0) and strong electron-donating N-heterocyclic carbene (NHC) ligands adequately form η(2)-aldehyde complexes in which the aldehyde is highly activated by back-bonding. With Ni(0)/NHC catalysts, processes involving intramolecular hydroacylation of alkenes and homo/cross-dimerization of aldehydes (the Tishchenko reaction) have been developed, and both proceed via the simultaneous η(2) coordination of aldehydes and other π components (alkenes or aldehydes). The results of the mechanistic studies are consistent with a reaction pathway that proceeds via an oxanickelacycle intermediate generated by the oxidative cyclization with a nickel(0) complex. In addition, we have used the η(2)-aldehyde nickel complex as an effective activator for an organosilane in order to generate a silicate reactant. These reactions show 100% atom efficiency, generate no wastes, and are conducted under mild conditions.
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Affiliation(s)
- Yoichi Hoshimoto
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
- Frontier Research Base for Global Young Researchers, Graduate School of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Masato Ohashi
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
| | - Sensuke Ogoshi
- Department of Applied Chemistry, Faculty of Engineering, Osaka University, Suita, Osaka 565-0871, Japan
- ACT-C, Japan Science and Technology Agency (JST), Suita, Osaka 565-0871, Japan
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13
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Yoshida M, Ukigai H, Shibatomi K, Hara S. Organocatalytic asymmetric Michael addition of α-branched aldehydes to vinyl ketones: synthesis of 5-ketoaldehydes possessing a stereo-controlled all-carbon quaternary stereogenic center. Tetrahedron Lett 2015. [DOI: 10.1016/j.tetlet.2015.04.107] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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14
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Shimotori Y, Hoshi M, Seki S, Osanai T, Okabe H, Ikeda Y, Miyakoshi T. Preparation of optically pure δ-lactones using diastereomeric resolution with amino acid as resolving agent. J Oleo Sci 2015; 64:75-90. [PMID: 25742924 DOI: 10.5650/jos.ess14124] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
Abstract
Synthesis of optically pure δ-lactones by diastereomeric resolution was investigated. Amino acid derivatives, which can be obtained at a relatively low cost, were used as resolving agents. Six optically pure δ-lactones were efficiently synthesized using Cbz-L-alanine without other expensive resolving agents. Both enantiomers of δ-lactone obtained had over 98% enantiomeric excesses. This diastereomeric resolution is very efficient for the preparation of optically pure δ-lactones.
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Affiliation(s)
- Yasutaka Shimotori
- Department of Biotechnology and Environmental Chemistry, Kitami Institute of Technology
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15
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Yu HZ, Tian XJ, Lin X, Hu GH, Dang ZM. Mechanistic origin of chemoselectivity in thiolate-catalyzed Tishchenko reactions. Chem Asian J 2014; 9:3472-81. [PMID: 25213329 DOI: 10.1002/asia.201402746] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Indexed: 11/06/2022]
Abstract
The thiolate-catalyzed Tishchenko reaction has shown high chemoselectivity for the formation of double aromatic-substituted esters. In the present study, the detailed reaction mechanism and, in particular, the origin of the observed high chemoselectivity, have been studied with DFT calculations. The catalytic cycle mainly consisted of three steps: 1,2-addition, hydride transfer, and acyl transfer steps. The calculation results reproduce the experimental observations that 4-chlorobenzaldehyde acts as the hydrogen donor (carbonyl part in the ester product), while 2-methoxybenzaldehyde acts as the hydrogen acceptor (alcohol part in the product). The two main factors are responsible for such chemoselectivity: 1) in the rate-determining hydride transfer step, the para-chloride substituent facilitates the hydride-donating process by weakening the steric hindrance, and 2) the ortho-methoxy substituent facilitates the hydride-accepting process by stabilizing the magnesium center (by compensating for the electron deficiency).
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Affiliation(s)
- Hai-Zhu Yu
- Department of Polymer Science and Engineering, University of Science and Technology Beijing, Beijing, 100083 (P.R. China)
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16
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Guevara-Pulido JO, Andrés JM, Pedrosa R. One-Pot Sequential Organocatalytic Michael–Tishchenko–Lactonization Reactions. Synthesis of Enantioenriched 4,5,6-Trisubstituted δ-Lactones. J Org Chem 2014; 79:8638-44. [DOI: 10.1021/jo5013724] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Affiliation(s)
- James O. Guevara-Pulido
- Instituto CINQUIMA and Departamento
de Química Orgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén 7, 47011 Valladolid, Spain
| | - José M. Andrés
- Instituto CINQUIMA and Departamento
de Química Orgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén 7, 47011 Valladolid, Spain
| | - Rafael Pedrosa
- Instituto CINQUIMA and Departamento
de Química Orgánica, Facultad de Ciencias, Universidad de Valladolid, Paseo de Belén 7, 47011 Valladolid, Spain
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17
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Žáček P, Kaluža L, Karban J, Storch J, Sýkora J. The rearrangement of 1-methylcyclohex-1-ene during the hydrodesulfurization of FCC gasoline over supported Co(Ni)Mo/Al2O3 sulfide catalysts: the isolation and identification of branched cyclic C7 olefins. REACTION KINETICS MECHANISMS AND CATALYSIS 2014. [DOI: 10.1007/s11144-014-0709-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Murphy SK, Dong VM. Enantioselective Ketone Hydroacylation Using Noyori’s Transfer Hydrogenation Catalyst. J Am Chem Soc 2013; 135:5553-6. [DOI: 10.1021/ja4021974] [Citation(s) in RCA: 73] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Stephen K. Murphy
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States,
and Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Vy M. Dong
- Department of Chemistry, University of California, Irvine, California 92697-2025, United States,
and Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
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19
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Rajesh K, Berke H. Alkali Metaltert-Butoxides, Hydrides and Bis(trimethylsilyl)amides as Efficient Homogeneous Catalysts for Claisen-Tishchenko Reaction. Adv Synth Catal 2013. [DOI: 10.1002/adsc.201200970] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Yu H, Fu Y. Mechanistic origin of cross-coupling selectivity in Ni-catalysed Tishchenko reactions. Chemistry 2012; 18:16765-73. [PMID: 23112051 DOI: 10.1002/chem.201202623] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2012] [Revised: 09/20/2012] [Indexed: 11/11/2022]
Abstract
Mechanistic studies have been performed for the recently developed, Ni-catalysed selective cross-coupling reaction between aryl and alkyl aldehydes. A mono-carbonyl activation (MCA) mechanism (in which one of the carbonyl groups is activated by oxidative addition) was found to be the most favourable pathway, and the rate-determining step is oxidative addition. Analysing the origin of the observed cross-coupling selectivity, we found the most favourable carbonyl activation step requires both coordination of the aryl aldehyde and oxidative addition of the alkyl aldehyde. Therefore, the stronger π-accepting ability of the aryl aldehyde (relative to alkyl aldehyde) and the ease of oxidative addition of the alkyl aldehyde (relative to aryl aldehyde) are responsible for the cross-coupling selectivity.
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Affiliation(s)
- Haizhu Yu
- Department of Chemistry, University of Science and Technology of China, Hefei, PR China
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21
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Curran SP, Connon SJ. The Thiolate-Catalyzed Intermolecular Crossed Tishchenko Reaction: Highly Chemoselective Coupling of Two Different Aromatic Aldehydes. Angew Chem Int Ed Engl 2012. [DOI: 10.1002/ange.201206343] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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22
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Curran SP, Connon SJ. The Thiolate-Catalyzed Intermolecular Crossed Tishchenko Reaction: Highly Chemoselective Coupling of Two Different Aromatic Aldehydes. Angew Chem Int Ed Engl 2012; 51:10866-70. [DOI: 10.1002/anie.201206343] [Citation(s) in RCA: 37] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2012] [Indexed: 11/09/2022]
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23
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Mercey G, Reboul V, Gulea M, Levillain J, Gaumont AC. Synthetic Methodologies for the Preparation of β-Amino Thiols. European J Org Chem 2012. [DOI: 10.1002/ejoc.201200347] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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24
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Curran SP, Connon SJ. Selenide Ions as Catalysts for Homo- and Crossed-Tishchenko Reactions of Expanded Scope. Org Lett 2012; 14:1074-7. [DOI: 10.1021/ol203439g] [Citation(s) in RCA: 51] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Simon P. Curran
- School of Chemistry, Centre for Synthesis and Chemical Biology, Trinity Biomedical Sciences Institute, University of Dublin, Trinity College, Dublin 2, Ireland
| | - Stephen J. Connon
- School of Chemistry, Centre for Synthesis and Chemical Biology, Trinity Biomedical Sciences Institute, University of Dublin, Trinity College, Dublin 2, Ireland
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25
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Boltukhina EV, Sheshenev AE, Lyapkalo IM. Convenient synthesis of non-conjugated alkynyl ketones from keto aldehydes by a chemoselective one-pot nonaflation—base catalyzed elimination sequence. Tetrahedron 2011. [DOI: 10.1016/j.tet.2011.05.095] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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26
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Xu H, Tian H, Zheng L, Liu Q, Wang L, Zhang S. One-pot and microwave-assisted synthesis of N-sulfonylaziridines. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.03.106] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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27
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Hoshimoto Y, Ohashi M, Ogoshi S. Nickel-Catalyzed Selective Conversion of Two Different Aldehydes to Cross-Coupled Esters. J Am Chem Soc 2011; 133:4668-71. [DOI: 10.1021/ja109908x] [Citation(s) in RCA: 106] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Yoichi Hoshimoto
- Department
of Applied Chemistry, Faculty of Engineering, and ‡Center for Atomic and Molecular
Technologies, Osaka University, Suita, Osaka 565-0871, Japan
| | - Masato Ohashi
- Department
of Applied Chemistry, Faculty of Engineering, and ‡Center for Atomic and Molecular
Technologies, Osaka University, Suita, Osaka 565-0871, Japan
| | - Sensuke Ogoshi
- Department
of Applied Chemistry, Faculty of Engineering, and ‡Center for Atomic and Molecular
Technologies, Osaka University, Suita, Osaka 565-0871, Japan
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28
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Banks HD. Substituent effects on the rate of formation of azomethine ylides. A computational investigation. Org Biomol Chem 2011; 9:6335-42. [DOI: 10.1039/c1ob05588g] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
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29
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O' Connor CJ, Manoni F, Curran SP, Connon SJ. Microwave-assisted efficient thiolate-catalysed homo- and crossed intermolecular Tishchenko reactions. NEW J CHEM 2011. [DOI: 10.1039/c0nj00790k] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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30
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Willis M. Katalytische intramolekulare Hydroacylierung von Ketonen: eine enantioselektive Synthese von Phthaliden. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.201000159] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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31
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Willis M. Catalytic Intramolecular Ketone Hydroacylation: Enantioselective Synthesis of Phthalides. Angew Chem Int Ed Engl 2010; 49:6026-7. [DOI: 10.1002/anie.201000159] [Citation(s) in RCA: 36] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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32
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Cronin L, Manoni F, O' Connor C, Connon S. Tunable Bromomagnesium Thiolate Tishchenko Reaction Catalysts: Intermolecular Aldehyde-Trifluoromethylketone Coupling. Angew Chem Int Ed Engl 2010. [DOI: 10.1002/ange.200907167] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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33
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Cronin L, Manoni F, O' Connor C, Connon S. Tunable Bromomagnesium Thiolate Tishchenko Reaction Catalysts: Intermolecular Aldehyde-Trifluoromethylketone Coupling. Angew Chem Int Ed Engl 2010; 49:3045-8. [DOI: 10.1002/anie.200907167] [Citation(s) in RCA: 56] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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34
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Groeper JA, Eagles JB, Hitchcock SR. A facile, one-pot synthesis of Ephedra-based aziridines. ACTA ACUST UNITED AC 2009. [DOI: 10.1016/j.tetasy.2009.07.016] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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35
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Kumar S, Helt JCP, Autschbach J, Detty MR. A New Reaction for Organoselenium Compounds: Alkyl Transfer from Diorganoselenium(IV) Dibromides to Alkenoic Acids To Give γ- and δ-Lactones. Organometallics 2009. [DOI: 10.1021/om900134p] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Affiliation(s)
- Sangit Kumar
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000
| | - Jay-Christian Paul Helt
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000
| | - Jochen Autschbach
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000
| | - Michael R. Detty
- Department of Chemistry, University at Buffalo, The State University of New York, Buffalo, New York 14260-3000
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36
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Schneiders K, Bösmann A, Schulz P, Wasserscheid P. Chirality Transfer in Imidazolium Camphorsulfonate Ionic Liquids through Ion Pairing Effects. Adv Synth Catal 2009. [DOI: 10.1002/adsc.200800569] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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37
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Shen Z, Dornan PK, Khan HA, Woo TK, Dong VM. Mechanistic Insights into the Rhodium-Catalyzed Intramolecular Ketone Hydroacylation. J Am Chem Soc 2009; 131:1077-91. [DOI: 10.1021/ja806758m] [Citation(s) in RCA: 117] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zengming Shen
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada, and Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Peter K. Dornan
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada, and Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Hasan A. Khan
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada, and Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Tom K. Woo
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada, and Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
| | - Vy M. Dong
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada, and Centre for Catalysis Research and Innovation, Department of Chemistry, University of Ottawa, Ottawa, Ontario, K1N 6N5, Canada
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38
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Shen Z, Khan HA, Dong VM. Rh-Catalyzed Carbonyl Hydroacylation: An Enantioselective Approach to Lactones. J Am Chem Soc 2008; 130:2916-7. [DOI: 10.1021/ja7109025] [Citation(s) in RCA: 121] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Zengming Shen
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
| | - Hasan A. Khan
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
| | - Vy M. Dong
- Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario, M5S 3H6, Canada
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39
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Tishchenko reactions of aldehydes promoted by diisobutylaluminum hydride and its application to the macrocyclic lactone formation. Tetrahedron 2007. [DOI: 10.1016/j.tet.2007.08.074] [Citation(s) in RCA: 33] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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40
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Hilt G, Bolze P, Heitbaum M, Hasse K, Harms K, Massa W. Synthesis of Hexahydrocyclopenta[c]furans by an Intramolecular Iron-Catalyzed Ring Expansion Reaction. Adv Synth Catal 2007. [DOI: 10.1002/adsc.200700035] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
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41
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42
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Hu L, Zhu H, Du DM, Xu J. Efficient Synthesis of Taurine and Structurally Diverse Substituted Taurines from Aziridines. J Org Chem 2007; 72:4543-6. [PMID: 17497929 DOI: 10.1021/jo070470c] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Taurine and substituted taurines were synthesized efficiently from aziridines via ring-opening reaction with thioacetic acid, oxidation with performic acid, and hydrolysis in hydrochloric acid. The current method shows more benefit in purification and efficiency in the preparation of taurine and structurally diverse 2-substituted, 2,2-disubstituted, and 1,2-, 2,2-, and 2,N-alkylene taurines.
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Affiliation(s)
- Libo Hu
- Beijing National Laboratory for Molecular Sciences (BNLMS), College of Chemistry and Molecular Engineering, Peking University, Beijing 100871, China
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43
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Tang Y, Oppenheimer J, Song Z, You L, Zhang X, Hsung RP. Strategies and approaches for constructing 1-oxadecalins. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.08.054] [Citation(s) in RCA: 93] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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44
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Samarium dienolate mediated stereoselective synthesis of anti-1,3-diol monoesters via aldol-Tishchenko reaction. Tetrahedron Lett 2006. [DOI: 10.1016/j.tetlet.2006.04.091] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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45
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Short diastereoselective synthesis of cis- and trans-hexahydropyrido[2,1-a]isoindole derivatives. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.10.045] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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46
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Tishchenko reactions and Oppenauer oxidation reactions of aldehydes promoted by diisobutylaluminum hydride. Tetrahedron Lett 2004. [DOI: 10.1016/j.tetlet.2004.02.145] [Citation(s) in RCA: 40] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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