1
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Oeser P, Tobrman T. Organophosphates as Versatile Substrates in Organic Synthesis. Molecules 2024; 29:1593. [PMID: 38611872 PMCID: PMC11154425 DOI: 10.3390/molecules29071593] [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: 02/01/2024] [Revised: 03/25/2024] [Accepted: 03/26/2024] [Indexed: 04/14/2024] Open
Abstract
This review summarizes the applications of organophosphates in organic synthesis. After a brief introduction, it discusses cross-coupling reactions, including both transition-metal-catalyzed and transition-metal-free substitution reactions. Subsequently, oxidation and reduction reactions are described. In addition, this review highlights the applications of organophosphates in the synthesis of natural compounds, demonstrating their versatility and importance in modern synthetic chemistry.
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Affiliation(s)
| | - Tomáš Tobrman
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic;
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2
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Konowalchuk DJ, Hall DG. Divergent Synthesis of 1,2,3,4-Tetrasubstituted Cyclobutenes from a Common Scaffold: Enantioselective Desymmetrization by Dual-Catalyzed Photoredox Cross-Coupling. Angew Chem Int Ed Engl 2023; 62:e202313503. [PMID: 37852934 DOI: 10.1002/anie.202313503] [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: 09/12/2023] [Revised: 10/12/2023] [Accepted: 10/17/2023] [Indexed: 10/20/2023]
Abstract
Four-membered carbocycles are important structural motifs found in several natural products and drugs. Amongst those, cyclobutenes are attractive intermediates because the residual olefin can be manipulated selectively into various saturated and unsaturated analogs. Few methods exist to access chiral tri- and tetra-C-substituted cyclobutenes and they are generally limited in terms of diversification. Herein, a divergent synthetic strategy was developed where a single optically enriched scaffold is diversified into a variety of derivatives with different substitution patterns. To this end, the enantioselective desymmetrization of prochiral 1,2-dibromocyclobutene imides was enabled by a dual Ir/Ni-catalyzed photoredox C(sp2 )-C(sp3 ) cross-coupling with an alkyltrifluoroborate salt to install a convertible carbon fragment in good yields and >90 % enantiomeric excess. Exceptional mono-coupling selectivity is observed and the resulting chiral bromocyclobutene serves as a common scaffold that can be transformed in a divergent manner into several valuable 1,2,3,4-tetra-C-substituted cyclobutane products while maintaining optical purity.
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Affiliation(s)
- Dawson J Konowalchuk
- Department of Chemistry, 4-010 Centennial Centre for Interdisciplinary Science, University of Alberta, 11335 Saskatchewan Dr NW, T6G 2G2, Edmonton, AB, Canada
| | - Dennis G Hall
- Department of Chemistry, 4-010 Centennial Centre for Interdisciplinary Science, University of Alberta, 11335 Saskatchewan Dr NW, T6G 2G2, Edmonton, AB, Canada
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3
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Qian YS, Zhao JB, Xu YH. Synthesis and Transformation of Bis(silyl)-Substituted Conjugated Vinylallene Compounds. Org Lett 2023; 25:7332-7337. [PMID: 37782771 DOI: 10.1021/acs.orglett.3c02738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/04/2023]
Abstract
We develop a copper-catalyzed disilylation of polysubstituted pent-1-en-4-yn-3-yl acetate derivatives, which in one pot furnishes the bis(silyl)-substituted vinylallenes in moderate yields under mild reaction conditions. The reaction shows broad substrate scope and single stereoselectivity. Besides, we develop a method to decrease the electrocyclization temperature of vinylallenes for the synthesis of methylenecyclobutenes by installing bis(silyl) substituents. And the effect of a silyl substituent on electrocyclization of vinylallenes was studied via DFT computation. The synthetic method features broad substrate scope and excellent stereoselectivity.
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Affiliation(s)
- Yi-Sen Qian
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. C
| | - Jin-Bo Zhao
- Faculty of Chemistry and Life Science, Changchun University of Technology, Changchun 130012, P. R. C
| | - Yun-He Xu
- Department of Chemistry, University of Science and Technology of China, Hefei 230026, P. R. C
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4
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Liashuk OS, Grygorenko OO, Volovenko YM, Waser J. Photochemical [2+2] Cycloaddition of Alkynyl Boronates. Chemistry 2023; 29:e202301650. [PMID: 37394686 DOI: 10.1002/chem.202301650] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/04/2023] [Revised: 06/30/2023] [Accepted: 06/30/2023] [Indexed: 07/04/2023]
Abstract
A photochemical [2+2] cycloaddition of alkynyl boronates and maleimides is reported. The developed protocol provided 35-70 % yield of maleimide-derived cyclobutenyl boronates and demonstrated wide compatibility with various functional groups. The synthetic utility of the prepared building blocks was demonstrated for a range of transformations, including Suzuki cross-coupling, catalytic or metal-hydride reduction, oxidation, and cycloaddition reactions. With aryl-substituted alkynyl boronates, the products of double [2+2] cycloaddition were obtained predominantly. Using the developed protocol, a cyclobutene-derived analogue of Thalidomide was prepared in one step. Mechanistic studies supported the participation of the triplet-excited state maleimides and ground state alkynyl boronates in the key step of the process.
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Affiliation(s)
- Oleksandr S Liashuk
- Chemical Faculty, Taras Shevchenko National University of Kyїv, Kyiv, Volodymyrska Street 60, 01601, Kyїv, Ukraine
- Laboratory of Catalysis and Organic Synthesis, Institut des Sciences et Ingénierie Chimique, Ecole Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
- Enamine Ltd., Kyiv, Winston Churchill Street 78, 02094, Kyїv, Ukraine
| | - Oleksandr O Grygorenko
- Chemical Faculty, Taras Shevchenko National University of Kyїv, Kyiv, Volodymyrska Street 60, 01601, Kyїv, Ukraine
- Enamine Ltd., Kyiv, Winston Churchill Street 78, 02094, Kyїv, Ukraine
| | - Yulian M Volovenko
- Chemical Faculty, Taras Shevchenko National University of Kyїv, Kyiv, Volodymyrska Street 60, 01601, Kyїv, Ukraine
| | - Jérôme Waser
- Laboratory of Catalysis and Organic Synthesis, Institut des Sciences et Ingénierie Chimique, Ecole Polytechnique Fédérale de Lausanne, 1015, Lausanne, Switzerland
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5
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Chernykh AV, Kudryk OV, Olifir OS, Dobrydnev AV, Rusanov E, Moskvina VS, Volochnyuk DM, Grygorenko OO. Expanding the Chemical Space of 1,2-Difunctionalized Cyclobutanes. J Org Chem 2023. [PMID: 36780233 DOI: 10.1021/acs.joc.2c02892] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
Abstract
An efficient approach to the synthesis of previously unavailable or hardly accessible 1,2-difunctionalized cyclobutanes (mostly with NH2/NHBoc, OH, SH, or SO2F groups attached to the carbocycle either directly or via a CH2 unit) relying on the divergent strategy is described. This class of compounds provides sp3-enriched and conformationally restricted building blocks that are of special demand for medicinal chemistry. The target compounds were prepared not only as pure racemic (±)-cis- and (±)-trans-diastereomers but in some cases also as single enantiomers. The developed procedures are readily scaled up and allow obtaining the target compounds on an up to hundred-gram scale. On the basis of the results of 20 X-ray diffraction experiments, structural characterization of the 1,2-difunctionalized cyclobutane core was performed using the extended Cremer-Pople puckering parameters and exit vector (EVP) plots.
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Affiliation(s)
- Anton V Chernykh
- Enamine Ltd. (www.enamine.net), Chervonotkatska Street 78, Kyïv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyïv 01601, Ukraine
| | - Oleksandr V Kudryk
- Enamine Ltd. (www.enamine.net), Chervonotkatska Street 78, Kyïv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyïv 01601, Ukraine
| | - Oleksandr S Olifir
- Enamine Ltd. (www.enamine.net), Chervonotkatska Street 78, Kyïv 02094, Ukraine.,V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry at National Academy of Sciences of Ukraine, Akademik Kukhar Street 1, Kyïv 02094, Ukraine
| | - Alexey V Dobrydnev
- Enamine Ltd. (www.enamine.net), Chervonotkatska Street 78, Kyïv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyïv 01601, Ukraine
| | - Eduard Rusanov
- Institute of Organic Chemistry at National Academy of Sciences of Ukraine, Akademik Kukhar Street 5, Kyïv 02094, Ukraine.,Department of Chemistry and Applied Biosciences, ETH Zurich, Vladimir-Prelog-Weg 1-5/10, Zürich 8093, Switzerland
| | - Viktoriia S Moskvina
- Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyïv 01601, Ukraine.,V.P. Kukhar Institute of Bioorganic Chemistry and Petrochemistry at National Academy of Sciences of Ukraine, Akademik Kukhar Street 1, Kyïv 02094, Ukraine
| | - Dmitriy M Volochnyuk
- Enamine Ltd. (www.enamine.net), Chervonotkatska Street 78, Kyïv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyïv 01601, Ukraine.,Institute of Organic Chemistry at National Academy of Sciences of Ukraine, Akademik Kukhar Street 5, Kyïv 02094, Ukraine
| | - Oleksandr O Grygorenko
- Enamine Ltd. (www.enamine.net), Chervonotkatska Street 78, Kyïv 02094, Ukraine.,Taras Shevchenko National University of Kyiv, Volodymyrska Street 60, Kyïv 01601, Ukraine
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6
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Čubiňák M, Varma N, Oeser P, Pokluda A, Pavlovska T, Cibulka R, Sikorski M, Tobrman T. Tuning the Photophysical Properties of Flavins by Attaching an Aryl Moiety via Direct C-C Bond Coupling. J Org Chem 2023; 88:218-229. [PMID: 36525315 DOI: 10.1021/acs.joc.2c02168] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
Palladium-catalyzed Suzuki reactions of brominated flavin derivatives (5-deazaflavins, alloxazines, and isoalloxazines) with boronic acids or boronic acid esters that occur readily under mild conditions were shown to be an effective tool for the synthesis of a broad range of 7/8-arylflavins. In general, the introduction of an aryl/heteroaryl group by means of a direct C-C bond has been shown to be a promising approach to tuning the photophysical properties of flavin derivatives. The aryl substituents caused a bathochromic shift in the absorption spectra of up to 52 nm and prolonged the fluorescence lifetime by up to 1 order of magnitude. Moreover, arylation of flavin derivatives decreased their ability to generate singlet oxygen.
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Affiliation(s)
- Marek Čubiňák
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28Prague 6, Czech Republic
| | - Naisargi Varma
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614Poznań, Poland
| | - Petr Oeser
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28Prague 6, Czech Republic
| | - Adam Pokluda
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28Prague 6, Czech Republic
| | - Tetiana Pavlovska
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28Prague 6, Czech Republic
| | - Radek Cibulka
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28Prague 6, Czech Republic
| | - Marek Sikorski
- Faculty of Chemistry, Adam Mickiewicz University, Uniwersytetu Poznańskiego 8, 61-614Poznań, Poland
| | - Tomáš Tobrman
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28Prague 6, Czech Republic
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7
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Andrés JL, Suárez E, Martín M, Sola E. Mechanistic Versatility at Ir(PSiP) Pincer Catalysts: Triflate Proton Shuttling from 2-Butyne to Diene and [3]Dendralene Motifs. Organometallics 2022; 41:2622-2630. [PMID: 36185395 PMCID: PMC9518705 DOI: 10.1021/acs.organomet.2c00375] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2022] [Indexed: 11/28/2022]
Abstract
![]()
The five-coordinate
hydrido complex [IrH(OTf)(PSiP)]
(1) catalytically transforms 2-butyne into a mixture
of its isomer
1,3-butadiene, and [3]dendralene and linear hexatriene dimerization
products: (E)-4-methyl-3-methylene-1,4-hexadiene
and (3Z)-3,4-dimethyl-1,3,5-hexatriene, respectively.
Under the conditions of the catalytic reaction, benzene, and 363 K,
the hexatriene further undergoes thermal electrocyclization into 2,3-dimethyl-1,3-cyclohexadiene.
The reactions between 1 and the alkyne substrate allow
isolation or nuclear magnetic resonance (NMR) observation of catalyst
resting states and possible reaction intermediates, including complexes
with the former PSiP pincer ligands disassembled into PSi and PC chelates,
and species coordinating allyl or carbene fragments en route to products.
The density functional theory (DFT) calculations guided by these experimental
observations disclose competing mechanisms for C–H bond elaboration
that move H atoms either classically, as hydrides, or as protons transported
by the triflate. This latter role of triflate, previously recognized
only for more basic anions such as carboxylates, is discussed to result
from combining the unfavorable charge separation in the nonpolar solvent
and the low electronic demand from the metal to the anion at coordination
positions trans to silicon. Triflate deprotonation of methyl groups
is key to release highly coordinating diene products from stable allyl
intermediates, thus enabling catalytic cycling.
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Affiliation(s)
- José L. Andrés
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC − Universidad de Zaragoza, Facultad de Ciencias, E50009 Zaragoza, Spain
| | - Elizabeth Suárez
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC − Universidad de Zaragoza, Facultad de Ciencias, E50009 Zaragoza, Spain
| | - Marta Martín
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC − Universidad de Zaragoza, Facultad de Ciencias, E50009 Zaragoza, Spain
| | - Eduardo Sola
- Instituto de Síntesis Química y Catálisis Homogénea (ISQCH), CSIC − Universidad de Zaragoza, Facultad de Ciencias, E50009 Zaragoza, Spain
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8
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Palladium-Catalyzed Cross-Coupling Reactions of Borylated Alkenes for the Stereoselective Synthesis of Tetrasubstituted Double Bond. ORGANICS 2022. [DOI: 10.3390/org3030017] [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
The stereoselective formation of tetrasubstituted alkenes remains one of the key goals of modern organic synthesis. In addition to other methods, the stereoselective synthesis of tetrasubstituted alkenes can be achieved by means of cross-coupling reactions of electrophilic and nucleophilic alkene templates. The use of electrophilic templates for the stereoselective synthesis of tetrasubstituted alkenes has previously been described. Therefore, the present review summarizes the procedures available for the stereoselective preparation of tetrasubstituted alkenes using stable and isolable nucleophilic templates.
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9
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Electrochemical, EPR, and computational study of pyrene conjugates—precursors for novel type of organic semiconductors. J Solid State Electrochem 2021. [DOI: 10.1007/s10008-021-05094-7] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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10
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Čubiňák M, Bigeon J, Galář P, Ondič L, Tobrman T. The Synthesis of Tetrasubstituted Cycloalkenes Bearing π‐Conjugated Substituents and Their Optical Properties. ChemistrySelect 2021. [DOI: 10.1002/slct.202103122] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Marek Čubiňák
- Department of Organic Chemistry University of Chemistry and Technology, Prague Technická 5 166 28 Prague 6 Czech Republic
| | - John Bigeon
- Institute of Physics Czech Academy of Sciences Cukrovarnická 10 Prague 6 Czech Republic
| | - Pavel Galář
- Institute of Physics Czech Academy of Sciences Cukrovarnická 10 Prague 6 Czech Republic
| | - Lukáš Ondič
- Institute of Physics Czech Academy of Sciences Cukrovarnická 10 Prague 6 Czech Republic
| | - Tomáš Tobrman
- Department of Organic Chemistry University of Chemistry and Technology, Prague Technická 5 166 28 Prague 6 Czech Republic
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11
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Oeser P, Edlová T, Čubiňák M, Tobrman T. Transition‐Metal‐Free Ring‐Opening Reaction of 2‐Halocyclobutanols through Ring Contraction. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100837] [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)
- Petr Oeser
- Department of Organic Chemistry University of Chemistry and Technology Prague Technická 5 166 28 Prague 6 Czech Republic
| | - Tereza Edlová
- Department of Organic Chemistry University of Chemistry and Technology Prague Technická 5 166 28 Prague 6 Czech Republic
| | - Marek Čubiňák
- Department of Organic Chemistry University of Chemistry and Technology Prague Technická 5 166 28 Prague 6 Czech Republic
| | - Tomáš Tobrman
- Department of Organic Chemistry University of Chemistry and Technology Prague Technická 5 166 28 Prague 6 Czech Republic
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12
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Koudelka J, Tobrman T. Synthesis of 2‐Substituted Cyclobutanones by a Suzuki Reaction and Dephosphorylation Sequence. European J Org Chem 2021. [DOI: 10.1002/ejoc.202100464] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Affiliation(s)
- Jakub Koudelka
- Department of Organic Chemistry University of Chemistry and Technology, Prague Technická 5 166 28 Prague 6 Czech Republic
| | - Tomáš Tobrman
- Department of Organic Chemistry University of Chemistry and Technology, Prague Technická 5 166 28 Prague 6 Czech Republic
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13
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Edlová T, Dvořáková H, Eigner V, Tobrman T. Substrate-Controlled Regioselective Bromination of 1,2-Disubstituted Cyclobutenes: An Application in the Synthesis of 2,3-Disubstituted Cyclobutenones. J Org Chem 2021; 86:5820-5831. [PMID: 33819050 DOI: 10.1021/acs.joc.1c00261] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Easily available disubstituted cyclobutenes were regioselectively halogenated at the allylic position by means of a reaction with bromine. The regioselectivity of bromination is controlled by the presence of a carbocation-stabilizing group. The prepared disubstituted 3-bromocyclobutenes were converted into the corresponding disubstituted cyclobutenones. On the basis of the performed experiments, the mechanism behind the bromination reaction was also proposed.
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Affiliation(s)
- Tereza Edlová
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic
| | - Hana Dvořáková
- Laboratory of NMR Spectroscopy, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic
| | - Václav Eigner
- Department of Solid State Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic
| | - Tomáš Tobrman
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic
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14
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Zhu J, Yang W, Zhang C, Wu L. Recent Progress in the Synthesis of Dendralenes: A Decade Update. CHINESE J ORG CHEM 2021. [DOI: 10.6023/cjoc202008024] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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15
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Tobrman T, Edlová T, Čubiňák M. Cross-Coupling Reactions of Double or Triple Electrophilic Templates for Alkene Synthesis. SYNTHESIS-STUTTGART 2020. [DOI: 10.1055/s-0040-1707270] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Abstract
AbstractThis short review summarizes the latest advances in the cross-coupling reactions of double and triple electrophilic templates bearing halogen atoms and an activated C–O bond. Reactions involving the formation of a C–C bond as part of di-, tri-, and tetrasubstituted double bond systems are highlighted.1 Introduction2 Cross-Coupling Reactions of Halovinyl Tosylates3 Cross-Coupling Reactions of Halovinyl Triflates4 Cross-Coupling Reactions of Halovinyl Phosphates5 Cross-Coupling Reactions of Halovinyl Esters6 Conclusion
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16
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Oeser P, Koudelka J, Dvořáková H, Tobrman T. Formation of trisubstituted buta-1,3-dienes and α,β-unsaturated ketones via the reaction of functionalized vinyl phosphates and vinyl phosphordiamidates with organometallic reagents. RSC Adv 2020; 10:35109-35120. [PMID: 35515642 PMCID: PMC9056830 DOI: 10.1039/d0ra07472a] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2020] [Accepted: 09/15/2020] [Indexed: 01/30/2023] Open
Abstract
We studied the reactions of vinyl phosphates and vinyl phosphordiamidates containing an ester functional group with organometallic reagents. We found that the functionalized vinyl phosphates were smoothly converted into tri- and tetrasubstituted buta-1,3-dienes via the reaction with aryllithium reagents. Moreover, the vinyl phosphordiamidates were converted into α,β-unsaturated ketones using Grignard reagents. Based on the performed experiments, we proposed a reaction mechanism, which was confirmed by means of the isolation of key intermediates. We studied the reactions of vinyl phosphates and vinyl phosphordiamidates containing an ester functional group with organometallic reagents.![]()
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Affiliation(s)
- Petr Oeser
- Department of Organic Chemistry, University of Chemistry and Technology Prague, Technická 5 166 28 Prague 6 Czech Republic
| | - Jakub Koudelka
- Department of Organic Chemistry, University of Chemistry and Technology Prague, Technická 5 166 28 Prague 6 Czech Republic
| | - Hana Dvořáková
- Laboratory of NMR Spectroscopy, University of Chemistry and Technology Prague, Technická 5 166 28 Prague 6 Czech Republic
| | - Tomáš Tobrman
- Department of Organic Chemistry, University of Chemistry and Technology Prague, Technická 5 166 28 Prague 6 Czech Republic
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17
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Čubiňák M, Tobrman T. Room-Temperature Negishi Reaction of Trisubstituted Vinyl Phosphates for the Synthesis of Tetrasubstituted Alkenes. J Org Chem 2020; 85:10728-10739. [PMID: 32674569 DOI: 10.1021/acs.joc.0c01254] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
The present study investigated the ability of bromovinyl phosphates to react with organozinc reagents at room temperature during palladium-catalyzed reactions. It was determined that both the bromine atom and the phosphate group were successfully substituted by means of the reaction with the organozinc reagents, thereby allowing for the synthesis of cyclic and acyclic tetrasubstituted double bonds. The low stability of the organozinc compounds in an acidic environment was exploited to accomplish the synthesis of alkenes using a one-pot, two-step experimental setup.
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Affiliation(s)
- Marek Čubiňák
- Department of Organic Chemistry, University of Chemistry and Technology, Technická 5, 166 28 Prague 6, Czech Republic
| | - Tomáš Tobrman
- Department of Organic Chemistry, University of Chemistry and Technology, Technická 5, 166 28 Prague 6, Czech Republic
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18
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Polák P, Čejka J, Tobrman T. Formal Transition-Metal-Catalyzed Phosphole C-H Activation for the Synthesis of Pentasubstituted Phospholes. Org Lett 2020; 22:2187-2190. [PMID: 32125161 DOI: 10.1021/acs.orglett.0c00359] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Unprecedented formal transition-metal-catalyzed phosphole C-H functionalization is described in this paper. Pentasubstituted phospholes were prepared via the copper-catalyzed reaction of 1,3,4-trisubstituted phosphole with aryl iodides or bromides under distinct conditions. The developed methodology is able to accommodate a wide variety of substituents, including aryl, heteroaryl, and alkenyl.
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Affiliation(s)
- Peter Polák
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic
| | - Jan Čejka
- Department of Solid State Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic
| | - Tomáš Tobrman
- Department of Organic Chemistry, University of Chemistry and Technology, Prague, Technická 5, 166 28 Prague 6, Czech Republic
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19
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Tobrman T, Krupička M, Polák P, Dvořáková H, Čubiňák M, Babor M, Dvořák D. Diastereoselective Cyclopropanation through Michael Addition-Initiated Ring Closure between α,α-Dibromoketones and α,β-Unsaturated Fischer Carbene Complexes. European J Org Chem 2020. [DOI: 10.1002/ejoc.201901503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Tomáš Tobrman
- Department of Organic Chemistry; University of Chemistry and Technology; Technická 5, Prague 6 166 28 Prague Czech Republic
| | - Martin Krupička
- Department of Organic Chemistry; University of Chemistry and Technology; Technická 5, Prague 6 166 28 Prague Czech Republic
| | - Peter Polák
- Department of Organic Chemistry; University of Chemistry and Technology; Technická 5, Prague 6 166 28 Prague Czech Republic
| | - Hana Dvořáková
- Laboratory of NMR Spectroscopy; University of Chemistry and Technology; Technická 5, Prague 6 166 28 Prague Czech Republic
| | - Marek Čubiňák
- Department of Organic Chemistry; University of Chemistry and Technology; Technická 5, Prague 6 166 28 Prague Czech Republic
| | - Martin Babor
- Department of Solid State Chemistry; University of Chemistry and Technology; Technická 5, Prague 6 166 28 Prague Czech Republic
| | - Dalimil Dvořák
- Department of Organic Chemistry; University of Chemistry and Technology; Technická 5, Prague 6 166 28 Prague Czech Republic
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