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Sakai N, Watanabe K, Mori H, Maegawa Y, Takeuchi R, Ogiwara Y, Ishida K. Selective O-Acylation of Enol Silyl Ethers with Acyl Fluorides Catalyzed by Fluoride Ions Derived from Potassium Fluoride and 18-Crown-6. ChemistryOpen 2024; 13:e202300300. [PMID: 38286634 PMCID: PMC11230931 DOI: 10.1002/open.202300300] [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: 12/10/2023] [Revised: 01/12/2024] [Indexed: 01/31/2024] Open
Abstract
The fluoride ion-catalyzed selective O-acylation of enol silyl ethers with acyl fluorides using KF and 18-Crown-6 is described herein. This catalytic system facilitated the practical and facile reaction of a variety of enol silyl ethers derived from aromatic/aliphatic ketones and aldehydes with acyl fluorides to afford useful and valuable enol esters.
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Affiliation(s)
- Norio Sakai
- Department of Pure and Applied ChemistryFaculty of Science and TechnologyTokyo University of Science (RIKADAI)Noda, Chiba278-8510Japan
| | - Kota Watanabe
- Department of Pure and Applied ChemistryFaculty of Science and TechnologyTokyo University of Science (RIKADAI)Noda, Chiba278-8510Japan
| | - Haruka Mori
- Department of Pure and Applied ChemistryFaculty of Science and TechnologyTokyo University of Science (RIKADAI)Noda, Chiba278-8510Japan
| | - Yuki Maegawa
- Department of Pure and Applied ChemistryFaculty of Science and TechnologyTokyo University of Science (RIKADAI)Noda, Chiba278-8510Japan
| | - Ryuki Takeuchi
- Department of Pure and Applied ChemistryFaculty of Science and TechnologyTokyo University of Science (RIKADAI)Noda, Chiba278-8510Japan
| | - Yohei Ogiwara
- Department of Pure and Applied ChemistryFaculty of Science and TechnologyTokyo University of Science (RIKADAI)Noda, Chiba278-8510Japan
| | - Kento Ishida
- Department of Pure and Applied ChemistryFaculty of Science and TechnologyTokyo University of Science (RIKADAI)Noda, Chiba278-8510Japan
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2
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Hooker LV, Bandar JS. Synthetic Advantages of Defluorinative C-F Bond Functionalization. Angew Chem Int Ed Engl 2023; 62:e202308880. [PMID: 37607025 PMCID: PMC10843719 DOI: 10.1002/anie.202308880] [Citation(s) in RCA: 13] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2023] [Revised: 08/20/2023] [Accepted: 08/21/2023] [Indexed: 08/24/2023]
Abstract
Much progress has been made in the development of methods to both create compounds that contain C-F bonds and to functionalize C-F bonds. As such, C-F bonds are becoming common and versatile synthetic functional handles. This review summarizes the advantages of defluorinative functionalization reactions for small molecule synthesis. The coverage is organized by the type of carbon framework the fluorine is attached to for mono- and polyfluorinated motifs. The main challenges, opportunities and advances of defluorinative functionalization are discussed for each class of organofluorine. Most of the text focuses on case studies that illustrate how defluorofunctionalization can improve routes to synthetic targets or how the properties of C-F bonds enable unique mechanisms and reactions. The broader goal is to showcase the opportunities for incorporating and exploiting C-F bonds in the design of synthetic routes, improvement of specific reactions and advent of new methods.
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Affiliation(s)
- Leidy V Hooker
- Department of Chemistry, Colorado State University, Fort Collins, CO, 80523, USA
| | - Jeffrey S Bandar
- Department of Chemistry, Colorado State University, Fort Collins, CO, 80523, USA
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3
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Ishihara R, Okamura K, Yoshimura Y, Ueno S. Diamine‐Promoted Deacylation of 2‐Alkyl‐1,3‐Diketones for the Facile Synthesis of Ketones. ChemistrySelect 2022. [DOI: 10.1002/slct.202202717] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Rei Ishihara
- Department of Applied Chemistry Graduate School of Engineering Tokyo University of Technology 1404-1 Katakura, Hachioji Tokyo 192–0982 Japan
| | - Kota Okamura
- Department of Applied Chemistry Graduate School of Engineering Tokyo University of Technology 1404-1 Katakura, Hachioji Tokyo 192–0982 Japan
| | - Yuki Yoshimura
- Department of Applied Chemistry Graduate School of Engineering Tokyo University of Technology 1404-1 Katakura, Hachioji Tokyo 192–0982 Japan
| | - Satoshi Ueno
- Department of Applied Chemistry Graduate School of Engineering Tokyo University of Technology 1404-1 Katakura, Hachioji Tokyo 192–0982 Japan
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4
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Kühlborn J, Groß J, Opatz T. Making natural products from renewable feedstocks: back to the roots? Nat Prod Rep 2020; 37:380-424. [DOI: 10.1039/c9np00040b] [Citation(s) in RCA: 35] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
This review highlights the utilization of biomass-derived building blocks in the total synthesis of natural products.
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Affiliation(s)
- Jonas Kühlborn
- Institute of Organic Chemistry
- Johannes Gutenberg University
- 55128 Mainz
- Germany
| | - Jonathan Groß
- Institute of Organic Chemistry
- Johannes Gutenberg University
- 55128 Mainz
- Germany
| | - Till Opatz
- Institute of Organic Chemistry
- Johannes Gutenberg University
- 55128 Mainz
- Germany
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Schranck J, Tlili A, Neumann H, Alsabeh PG, Stradiotto M, Beller M. A Selective Palladium-Catalyzed Carbonylative Arylation of Aryl Ketones to Give Vinylbenzoate Compounds. Chemistry 2012; 18:15592-7. [DOI: 10.1002/chem.201202895] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/13/2012] [Revised: 09/18/2012] [Indexed: 11/05/2022]
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6
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Laclef S, Exner CJ, Turks M, Videtta V, Vogel P. Synthesis of (E,Z)-1-alkoxy-3-acyloxy-2-methylpenta-1,3-dienes via Danishefsky-type dienes or O-acylation of enones. J Org Chem 2010; 74:8882-5. [PMID: 19842642 DOI: 10.1021/jo901878b] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
1-Alkoxy-2-methyl-3-acyloxy-(E,E)-penta-1,3-dienes have been prepared applying among others a modified Danishefsky's general method, including chiral, racemic, and achiral derivatives.
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Affiliation(s)
- Sylvain Laclef
- Laboratory of Glycochemistry and Asymmetric Synthesis, Swiss Federal Institute of Technology (EPFL), Batochime, CH-1015 Lausanne, Switzerland
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7
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Nguyen VTH, Appel B, Langer P. Synthesis of chromanes by sequential ‘[3+3]-cyclization/Williamson’ reactions of 1,3-bis(trimethylsilyloxy)-7-chlorohepta-1,3-dienes. Tetrahedron 2006. [DOI: 10.1016/j.tet.2006.05.076] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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8
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Szpilman AM, Korshin EE, Rozenberg H, Bachi MD. Total Syntheses of Yingzhaosu A and of Its C(14)-Epimer Including the First Evaluation of Their Antimalarial and Cytotoxic Activities. J Org Chem 2005; 70:3618-32. [PMID: 15844999 DOI: 10.1021/jo050074z] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
[reaction: see text] The molecular structure of the naturally occurring antimalarial agent yingzhaosu A (1) is characterized by a 2,3-dioxabicyclo[3.3.1]nonane system (3a), an allylic alcohol, a homoallylic alcohol, and five stereogenic centers. Herein we report on the total synthesis of yingzhaosu A (1) in eight steps and 7.3% overall yield starting from (S)-limonene (12). To maximize efficacy, the bridged bicyclic endoperoxide molecular core was constructed by a multicomponent free-radical domino reaction in which five bonds are formed in a single operation. In addition, reaction protocols that are compatible with the sensitivity of the peroxide function to strong basic and nucleophilic reagents as well as to reducing agents were employed. An intriguing step involved the selective hydrogenation of a carbon-carbon double bond in the presence of a peroxide and an aldehyde function to give aldehyde peroxide 7. The two major synthons (aldehydoperoxide 7 and its complementary five-carbon atom unit 35) were linked through a Mukaiyama aldol reaction followed by in situ dehydration under mild buffered basic conditions. The carbonyl group in the resulting peroxidic enone 39 was stereoselectively reduced with either R-CBS catalyst (42b) to give, after in situ desilylation, yingzhaosu A (1) or with S-CBS catalyst (42a) its C(14)-epimer 40. The first quantitative in vitro and in vivo data for the antimalarial activity of yingzhaosu A (1) and its C(14)-epimer 40 are reported. The C(14)-epiyingzhaosu A (40) exhibits potent cytotoxic activity against the KB nasal-pharyngeal cancer cell line in vitro.
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Affiliation(s)
- Alex M Szpilman
- Department of Organic Chemistry, The Weizmann Institute of Science, 76100 Rehovot, Israel
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9
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Turks M, Huang X, Vogel P. Expeditious Asymmetric Synthesis of a Stereoheptad Corresponding to the C(19)-C(27)-Ansa Chain of Rifamycins: Formal Total Synthesis of Rifamycin S. Chemistry 2005; 11:465-76. [PMID: 15551311 DOI: 10.1002/chem.200400825] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
In the presence of sulfur dioxide and an acid promoter, (-)-(1E,3Z)-2-methyl-1-((1S)-1-phenylethoxy)penta-1,3-dien-3-yl isobutyrate reacts with (Z)-3-(trimethylsilyloxy)pent-2-ene giving a silyl sulfinate intermediate that undergoes, in the presence of palladium catalyst, a desilylation and retro-ene elimination of SO(2) with formation of (-)-(1Z,2S,3R,4S)-1-ethylidene-2,4-dimethyl-5-oxo-3-((1S)-1-phenylethoxy)-heptyl isobutyrate as major product. This ethyl ketone undergoes cross-aldol reaction with (2S)-2-methyl-3-[(tert-butyldimethylsilyl)oxy]propanal giving an aldol that is reduced into a stereoheptad corresponding to the C(19)-C(27)-segment of Rifamycins with high diastereoselectivity and enantiomeric excess.
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Affiliation(s)
- Māris Turks
- Laboratory of Glycochemistry and Asymmetric Synthesis, Swiss Federal Institute of Technology, BCH 1015, Lausanne-Dorigny, Switzerland
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10
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Hong Nguyen VT, Langer P. Synthesis of functionalized benzopyrans by sequential [3+3]-cyclization—Williamson reactions of 1,3-bis(trimethylsilyloxy)-7-chlorohepta-1,3-dienes. Tetrahedron Lett 2005. [DOI: 10.1016/j.tetlet.2004.12.009] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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11
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Guha SK, Shibayama A, Abe D, Sakaguchi M, Ukaji Y, Inomata K. “Syn-Effect” in the Conversion of (E)-α,β-Unsaturated Esters into the Corresponding β,γ-Unsaturated Esters and Aldehydes into Silyl Enol Ethers. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2004. [DOI: 10.1246/bcsj.77.2147] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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12
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Lyapkalo IM, Högermeier J, Reissig HU. Synthesis of new tropinone derivatives by palladium-catalyzed couplings of 8-azabicyclo[3.2.1]oct-2-enyl nonaflates. Tetrahedron 2004. [DOI: 10.1016/j.tet.2004.06.036] [Citation(s) in RCA: 18] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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13
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Wiles C, Watts P, Haswell SJ, Pombo-Villar E. The regioselective preparation of 1,3-diketones. Tetrahedron Lett 2002. [DOI: 10.1016/s0040-4039(02)00432-x] [Citation(s) in RCA: 31] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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14
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Lyapkalo I, Webel M, Reißig HU. An Expedient and Stereoselective Synthesis of Alkenyl Nonaflates from Silyl Enol Ethers: Optimization, Scope and Limitations. European J Org Chem 2002. [DOI: 10.1002/1099-0690(200203)2002:6<1015::aid-ejoc1015>3.0.co;2-k] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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15
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Narkevitch V, Megevand S, Schenk K, Vogel P. Development of a new carbon-carbon bond forming reaction. new organic chemistry of sulfur dioxide. Asymmetric four-component synthesis of polyfunctional sulfones. J Org Chem 2001; 66:5080-93. [PMID: 11463260 DOI: 10.1021/jo0101712] [Citation(s) in RCA: 36] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
At low temperature 1-alkoxy-1,3-dienes add to sulfur dioxide activated by a Lewis or Brønstedt acid and generate zwitterionic intermediates that can be quenched by enoxysilanes. The resulting beta,gamma-unsaturated silyl sulfinates can be desilylated and reacted with methyl iodide to provide polyfunctional sulfones. Exploratory studies of this four-component synthesis of sulfones are reported. Enantiomerically pure derivatives containing up to three new stereogenic centers can be obtained using enantiomerically pure (E,E)-1-alkoxy-2-methylpenta-1,3-dienes derived from alpha-methyl benzyl alcohols, including the Greene's chiral auxiliary. The stereochemistry of the reactions is consistent with a mechanism involving the suprafacial hetero-Diels-Alder addition of sulfur dioxide to the 1-alkoxy-1,3-dienes that are rapidly ionized into zwitterionic intermediates.
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Affiliation(s)
- V Narkevitch
- Section de Chimie, Université de Lausanne, BCH, CH-1015 Lausanne-Dorigny, Switzerland
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16
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Söderberg BC, O'Neil SN, Chisnell AC, Liu J. A [3.3]Sigmatropic Rearrangement of α,β-Unsaturated Fischer Chromium Carbenes: Synthesis of Alkynol and Dienol Esters. Tetrahedron 2000. [DOI: 10.1016/s0040-4020(00)00216-7] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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17
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Abstract
The first synthesis of (+)-casuarine ((+)-6), a pentahydroxy pyrrolizidine alkaloid of the alexine/australine subclass, is described. The key step is a tandem [4 + 2]/[3 + 2] nitroalkene cycloaddition involving nitrobenzoate 13, chiral vinyl ether 16c, and vinyl silane 10, which establishes five of the six stereocenters present in this potent glycosidase inhibitor. The completion of the synthesis requires only four additional steps to deliver the final product in 20% overall yield.
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Affiliation(s)
- S E Denmark
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana, Illinois 61801, USA
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18
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Abstract
[formula: see text] The first synthesis of (+)-casuarine, a pentahydroxy pyrrolizidine alkaloid, is described. The key bond-forming events occur in a tandem [4 + 2]/[3 + 2] nitroalkene cycloaddition involving nitroalkene 6, chiral vinyl ether 7b, and vinyl silane 4. This process also creates five of the six stereocenters present in this potent glycosidase inhibitor. Completion of the synthesis required only four additional steps and delivered (+)-casuarine in 20% overall yield.
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Affiliation(s)
- S E Denmark
- Roger Adams Laboratory, Department of Chemistry, University of Illinois, Urbana 61801, USA.
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19
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Kalita DJ, Borah R, Sarma JC. A Selective Catalytic Method of Enol-acetylation under Microwave Irradiation. JOURNAL OF CHEMICAL RESEARCH 1999. [DOI: 10.1177/174751989902300630] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Six-membered cyclic ketones on treatment with acetic anhydride and a catalytic amount of iodine under microwave irradiation give the corresponding enol acetates in good yield.
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Affiliation(s)
- Dipok J. Kalita
- Natural Products Chemistry Division, Regional Research Laboratory, Jorhat 785006, Assam, India
| | - Ruli Borah
- Natural Products Chemistry Division, Regional Research Laboratory, Jorhat 785006, Assam, India
| | - Jadab C. Sarma
- Natural Products Chemistry Division, Regional Research Laboratory, Jorhat 785006, Assam, India
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20
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Le Roux C, Mandrou S, Dubac J. First Catalytic C-Acylation of Enoxysilanes: An Efficient Route to beta-Diketones(1). J Org Chem 1996; 61:3885-3887. [PMID: 11667246 DOI: 10.1021/jo960090j] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Christophe Le Roux
- Hétérochimie Fondamentale et Appliquée (UPRES(A)5069 CNRS), Université Paul Sabatier, 118 route de Narbonne, 31062 Toulouse Cédex, France
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