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Huszár B, Szolga R, Bősze S, Oláhné Szabó R, Simon A, Karaghiosoff K, Czugler M, Drahos L, Keglevich G. Synthesis and Anticancer Activity of Phosphinoylated and Phosphonoylated N-Heterocycles Obtained by the Microwave-Assisted Palladium Acetate-Catalyzed Hirao Reaction. Chemistry 2023; 29:e202302465. [PMID: 37711077 DOI: 10.1002/chem.202302465] [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: 07/31/2023] [Revised: 08/28/2023] [Accepted: 09/12/2023] [Indexed: 09/16/2023]
Abstract
A literature survey showed that different derivatives with the 9-phenyl-9H-carbazole or the dihydroindoline scaffold may be of biological activity including cytotoxic effect. Driven by this experience, P-functionalized derivatives of these N-heterocycles were synthesized. Three N-heterocycles, 9-(4-bromophenyl)-9H-carbazole, 3-bromo-9-phenyl-9H-carbazole and 1-(5-bromoindolin-1-yl)ethan-1-one, were coupled with dialkyl phosphites and diarylphosphine oxides using Pd(OAc)2 (10 %) as the catalyst precursor and triethylamine as the base in ethanol under microwave irradiation. The excess of the Y2 P(O)H reagent (Y=alkoxy, aryl) (30 %) served as the P-ligand in its trivalent tautomeric form (Y2 POH), hence there was no need for the usual P-ligands meaning cost and environmental burden. Hence, the presented method is a "green" approach that proved to be more efficient than the preparation by the traditional method. The products, dialkyl phosphonates and tertiary phosphine oxides obtained in 58-84 % yields were characterized, one of them also by single crystal X-ray analysis, and were subjected to in vitro biological activity evaluation. A (carbazol)yl-phenylphosphonate, an N-phenyl-(carbazol)yl-phosphonate, a (carbazol)yl-phenylphosphine oxide and an N-phenyl-(carbazol)ylphosphine oxide revealed a significant cytotoxic activity on A549 human non-small-cell lung carcinoma and MonoMac-6 acute monocytic leukemia cancer cells. The cytotoxic effect was significant as compared to that of the reference compounds.
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Affiliation(s)
- Bianka Huszár
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1521, Budapest, Hungary
| | - Renáta Szolga
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1521, Budapest, Hungary
| | - Szilvia Bősze
- Eötvös Loránd Research Network (ELKH), Research Group of Peptide Chemistry, Eötvös Loránd University, 1117, Budapest, Hungary
| | - Rita Oláhné Szabó
- Eötvös Loránd Research Network (ELKH), Research Group of Peptide Chemistry, Eötvös Loránd University, 1117, Budapest, Hungary
- Department of Genetics, Cell-and Immunobiology, Semmelweis University, 1089, Budapest, Nagyvárad tér 4, Hungary
| | - András Simon
- Department of Inorganic and Analytical Chemistry, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1521, Budapest, Hungary
| | - Konstantin Karaghiosoff
- Department Chemie, Ludwig-Maximilians-Universitat München, 81377, München, Butenandtstr. 5-13, Germany
| | - Mátyás Czugler
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1521, Budapest, Hungary
| | - László Drahos
- MS Proteomics Research Group, Research Centre for Natural Sciences, 1117, Budapest, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1521, Budapest, Hungary
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Huszár B, Mucsi Z, Keglevich G. Microwave-Assisted Palladium Acetate-Catalyzed C-P Cross-Coupling of Arylboronic Acids and >P(O)H Reagents in the Absence of the Usual Mono- and Bidentate P-Ligands: Mechanistic Insights. J Org Chem 2023; 88:11980-11991. [PMID: 37556619 PMCID: PMC10442920 DOI: 10.1021/acs.joc.3c01269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2023] [Indexed: 08/11/2023]
Abstract
A less-studied halogen-free variation of the Hirao reaction involving the coupling of arylboronic acids with >P(O)H reagents, such as diarylphosphine oxides, diethyl phosphite, and ethyl phenyl-H-phosphinate, was investigated in detail using Pd(OAc)2 as the catalyst precursor and applying some excess of the P-reagent to supply the ligand via its trivalent tautomeric (>P-OH) form. The optimum conditions (1.2 equiv of the P-reagent, 135-150 °C, and air) were explored for the synthesis of diaryl-phenylphosphine oxides, aryl-diphenylphosphine oxides, diethyl arylphosphonates, ethyl diphenylphosphinate, and two bisphosphinoyl derivatives. In the reaction of 4-chlorophenyl- or 3-chlorophenylboronic acid with Ph2P(O)H, triphenylphosphine oxide was also formed as a byproduct. Theoretical calculations suggested that the catalytic cycle of the P-C coupling of PhB(OH)2 with Ph2P(O)H is different from that of the usual cross-coupling reactions. It comprises the addition of a phenyl anion and then the tautomeric form >P-OH of the >P(O)H reagent to the Pd2+ catalyst complex. This is then followed by reductive elimination affording Ph3PO that is accompanied with the conversion of Pd2+ to Pd0. There is a need for a subsequent stoichiometric oxidation of Pd(0) by molecular oxygen. The spontaneous formation of the self-assembling ligands around the Pd2+ center from the >P(O)H reactant plays a crucial role in the mechanism and promotes the efficiency of the catalyst.
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Affiliation(s)
- Bianka Huszár
- Department
of Organic Chemistry and Technology, Faculty of Chemical Technology
and Biotechnology, Budapest University of
Technology and Economics, 1521 Budapest, Hungary
| | - Zoltán Mucsi
- Department
of Organic Chemistry and Technology, Faculty of Chemical Technology
and Biotechnology, Budapest University of
Technology and Economics, 1521 Budapest, Hungary
- Faculty
of Materials and Chemical Sciences, University
of Miskolc, 3515 Miskolc, Hungary
| | - György Keglevich
- Department
of Organic Chemistry and Technology, Faculty of Chemical Technology
and Biotechnology, Budapest University of
Technology and Economics, 1521 Budapest, Hungary
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3
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Pd-Catalyzed Hirao P–C Coupling Reactions with Dihalogenobenzenes without the Usual P-Ligands under MW Conditions. Catalysts 2022. [DOI: 10.3390/catal12101080] [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
A literature survey of the P–C coupling reactions of 1,4-and 1,2-bromo-iodobenzenes with diphenylphosphine oxide or diethyl phosphite under different conditions comprising Pd-, Ni-, or Cu-catalysis revealed that, depending on the experimental details, the yields of the corresponding >P(O)-bromobenzenes were rather diverse and occasionally contradicting. Therefore, the reactivity of a series of 1,4-, 1,3- and 1,2-dibromo- and bromo-iodobenzenes with the above mentioned P-reagents was evaluated under the “P-ligand-free” microwave (MW)-assisted conditions elaborated by us. Starting from dibromobenzenes and iodo-bromoarenes, practical and competent syntheses were developed for phosphonoyl- and phosphinoyl-bromoarenes, and, in a few instances, for arenes with two P-functions. The cheaper dibromobenzenes may be substituted for the bromo-iodo derivatives. In all, 12 products were prepared in yields of 45–82%. They were fully characterized. The method described does not require the use of traditional P-ligands.
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Huszár B, Mucsi Z, Szolga R, Keglevich G. New data on the Hirao reaction; The use of Cu(II) salts as the catalyst precursor under microwave irradiation in the absence of added P-ligands. J Organomet Chem 2022. [DOI: 10.1016/j.jorganchem.2022.122526] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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5
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Huszár B, Henyecz R, Mucsi Z, Keglevich G. Microwave assisted P–C coupling reactions without directly added P-ligands. PHOSPHORUS SULFUR 2022. [DOI: 10.1080/10426507.2021.2011884] [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]
Affiliation(s)
- Bianka Huszár
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Réka Henyecz
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Zoltán Mucsi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
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Liu H, Sun K, Li X, Zhang J, Lu W, Luo X, Luo H. Palladium-catalyzed phosphorylation of arylsulfonium salts with P(O)H compounds via C–S bond cleavage. RSC Adv 2022; 12:25280-25283. [PMID: 36199296 PMCID: PMC9450109 DOI: 10.1039/d2ra04297e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Accepted: 08/31/2022] [Indexed: 11/21/2022] Open
Abstract
Herein we report a novel palladium-catalyzed phosphorylation of arylsulfonium salts with P(O)H compounds via C–S bond cleavage under mild conditions.
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Affiliation(s)
- Huijin Liu
- Department of Chemistry & Chemical Engineering, Gannan Normal University, Ganzhou 341000, China
| | - Kai Sun
- Department of Chemistry & Chemical Engineering, Gannan Normal University, Ganzhou 341000, China
| | - Xiaolan Li
- Department of Chemistry & Chemical Engineering, Gannan Normal University, Ganzhou 341000, China
| | - Jie Zhang
- Department of Chemistry & Chemical Engineering, Gannan Normal University, Ganzhou 341000, China
| | - Wei Lu
- Department of Chemistry & Chemical Engineering, Gannan Normal University, Ganzhou 341000, China
| | - Xuzhong Luo
- Department of Chemistry & Chemical Engineering, Gannan Normal University, Ganzhou 341000, China
| | - Haiqing Luo
- Department of Chemistry & Chemical Engineering, Gannan Normal University, Ganzhou 341000, China
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McErlain H, Riley LM, Sutherland A. Palladium-Catalyzed C-P Bond-Forming Reactions of Aryl Nonaflates Accelerated by Iodide. J Org Chem 2021; 86:17036-17049. [PMID: 34726917 PMCID: PMC8650017 DOI: 10.1021/acs.joc.1c02172] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2021] [Indexed: 11/28/2022]
Abstract
An iodide-accelerated, palladium-catalyzed C-P bond-forming reaction of aryl nonaflates is described. The protocol was optimized for the synthesis of aryl phosphine oxides and was found to be tolerant of a wide range of aryl nonaflates. The general nature of this transformation was established with coupling to other P(O)H compounds for the synthesis of aryl phosphonates and an aryl phosphinate. The straightforward synthesis of stable, isolable aryl nonaflates, in combination with the rapid C-P bond-forming reaction allows facile preparation of aryl phosphorus target compounds from readily available phenol starting materials. The synthetic utility of this general strategy was demonstrated with the efficient preparation of an organic light-emitting diode (OLED) material and a phosphonophenylalanine mimic.
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Affiliation(s)
- Holly McErlain
- School of Chemistry, The
Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Leanne M. Riley
- School of Chemistry, The
Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, United Kingdom
| | - Andrew Sutherland
- School of Chemistry, The
Joseph Black Building, University of Glasgow, Glasgow G12 8QQ, United Kingdom
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Chen Y, Zhang S, Xue Y, Mo L, Zhang Z. Palladium anchored on a covalent organic framework as a heterogeneous catalyst for phosphorylation of aryl bromides. Appl Organomet Chem 2021. [DOI: 10.1002/aoc.6480] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Yu‐Xuan Chen
- Hebei Key Laboratory of Organic Functional Molecules, National Experimental Chemistry Teaching Center, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
| | - Shuo Zhang
- Hebei Key Laboratory of Organic Functional Molecules, National Experimental Chemistry Teaching Center, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
| | - Yu‐Jie Xue
- Hebei Key Laboratory of Organic Functional Molecules, National Experimental Chemistry Teaching Center, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
| | - Li‐Ping Mo
- Hebei Key Laboratory of Organic Functional Molecules, National Experimental Chemistry Teaching Center, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
| | - Zhan‐Hui Zhang
- Hebei Key Laboratory of Organic Functional Molecules, National Experimental Chemistry Teaching Center, College of Chemistry and Materials Science Hebei Normal University Shijiazhuang China
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10
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MW-Promoted Cu(I)-Catalyzed P–C Coupling Reactions without the Addition of Conventional Ligands; an Experimental and a Theoretical Study. Catalysts 2021. [DOI: 10.3390/catal11080933] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
An experimental and a theoretical study on the so far less investigated Cu(I) salt-catalyzed Hirao reaction of iodobenzene and diarylphosphine oxides (DAPOs) revealed that Cu(I)Br or Cu(I)Cl is the most efficient catalyst under microwave irradiation. The optimum conditions included 165 °C and a 1:2 molar ratio for DAPOs and triethylamine. The possible ligations of Cu(I) were studied in detail. Bisligated P---Cu(I)---P (A), P---Cu(I)---N (B) and N---Cu(I)---N (C) complexes were considered as the catalysts. Calculations on the mechanism suggested that complexes A and B may catalyze the P–C coupling, but the latter one is more advantageous both according to experiments and calculations pointing out the Cu(I) → Cu(III) conversion in the oxidative addition step. The P–C coupling cannot take place with PhBr, as in this case, the catalyst complex cannot be regenerated.
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11
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Chen C, Liu L, Sun W, Zhu B. Palladium‐Catalyzed Aryl‐Carbamoylation of Alkene‐Tethered Carbamoyl Chlorides: Access to Diverse Aryl‐Functionalized Oxindoles. ChemistrySelect 2021. [DOI: 10.1002/slct.202101985] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Chen Chen
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry Tianjin Normal University Tianjin 300387 P. R. China
| | - Liying Liu
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry Tianjin Normal University Tianjin 300387 P. R. China
| | - Wan Sun
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry Tianjin Normal University Tianjin 300387 P. R. China
| | - Bolin Zhu
- Tianjin Key Laboratory of Structure and Performance for Functional Molecules, College of Chemistry Tianjin Normal University Tianjin 300387 P. R. China
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12
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Jójárt R, Tahaei SAS, Trungel-Nagy P, Kele Z, Minorics R, Paragi G, Zupkó I, Mernyák E. Synthesis and evaluation of anticancer activities of 2- or 4-substituted 3-( N-benzyltriazolylmethyl)-13α-oestrone derivatives. J Enzyme Inhib Med Chem 2021; 36:58-67. [PMID: 33121276 PMCID: PMC7598997 DOI: 10.1080/14756366.2020.1838500] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022] Open
Abstract
2- or 4-Substituted 3-N-benzyltriazolylmethyl-13α-oestrone derivatives were synthesised via bromination of ring A and subsequent microwave-assisted, Pd-catalysed C(sp2)–P couplings. The antiproliferative activities of the newly synthesised brominated and phosphonated compounds against a panel of human cancer cell lines (A2780, MCF-7, MDA-MB 231) were investigated by means of MTT assays. The most potent compound, the 3-N-benzyltriazolylmethyl-4-bromo-13α-oestrone derivative exerted substantial selective cell growth-inhibitory activity against A2780 cell line with a submicromolar IC50 value. Computational calculations reveal strong interactions of the 4-bromo derivative with both colchicine and taxoid binding sites of tubulin. Disturbance of tubulin function has been confirmed by photometric polymerisation assay.
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Affiliation(s)
- Rebeka Jójárt
- Department of Organic Chemistry, University of Szeged, Szeged, Hungary
| | | | | | - Zoltán Kele
- Department of Medicinal Chemistry, University of Szeged, Szeged, Hungary
| | - Renáta Minorics
- Department of Pharmacodynamics and Biopharmacy, University of Szeged, Szeged, Hungary
| | - Gábor Paragi
- MTA-SZTE Biomimetic Systems Research Group, University of Szeged, Szeged, Hungary
| | - István Zupkó
- Department of Pharmacodynamics and Biopharmacy, University of Szeged, Szeged, Hungary
| | - Erzsébet Mernyák
- Department of Organic Chemistry, University of Szeged, Szeged, Hungary
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13
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Zhang Y, Chen W, Tan T, Gu Y, Zhang S, Li J, Wang Y, Hou W, Yang G, Ma P, Xu H. Palladium-catalyzed one-pot phosphorylation of phenols mediated by sulfuryl fluoride. Chem Commun (Camb) 2021; 57:4588-4591. [PMID: 33956028 DOI: 10.1039/d1cc00769f] [Citation(s) in RCA: 16] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
We report a general palladium-catalyzed one-pot procedure for the synthesis of phosphonates, phosphinates and phosphine oxides from phenols mediated by sulfuryl fluoride. It features mild conditions, broad substrate scope, high functionality tolerance and water insensitivity. The utility of this procedure has been well demonstrated by gram-scale synthesis, sequential synthesis of click chemistry building blocks, late-stage decoration of drugs and natural products and on-DNA synthesis of phosphine oxide for a DNA-encoded library (DEL).
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Affiliation(s)
- Yiyuan Zhang
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai, 201210, China. and School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China and Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200031, China and University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Wanting Chen
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai, 201210, China. and School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China and Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200031, China and University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Tingting Tan
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai, 201210, China. and School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China and Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200031, China and University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Yuang Gu
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai, 201210, China. and School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China and Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200031, China and University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Shuning Zhang
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai, 201210, China. and School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China and Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200031, China and University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Jie Li
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai, 201210, China.
| | - Yan Wang
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai, 201210, China. and School of Life Science and Technology, ShanghaiTech University, Shanghai, 201210, China and Institute of Biochemistry and Cell Biology, Shanghai Institutes for Biological Sciences, Chinese Academy of Sciences, Shanghai, 200031, China and University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Wei Hou
- College of Pharmaceutical Science, and Institute of Drug Development & Chemical Biology, Zhejiang University of Technology, Hangzhou, 310014, China
| | - Guang Yang
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai, 201210, China.
| | - Peixiang Ma
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai, 201210, China.
| | - Hongtao Xu
- Shanghai Institute for Advanced Immunochemical Studies, ShanghaiTech University, Shanghai, 201210, China.
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Bajohr J, Diallo AG, Whyte A, Gaillard S, Renaud JL, Lautens M. Palladium-Catalyzed Domino Heck/Sulfination: Synthesis of Sulfonylated Hetero- and Carbocyclic Scaffolds Using DABCO-Bis(sulfur dioxide). Org Lett 2021; 23:2797-2801. [PMID: 33719466 DOI: 10.1021/acs.orglett.1c00716] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The synthesis of a broad variety of hetero- and carbocyclic scaffolds via a Pd-catalyzed domino Heck/SO2 insertion reaction is reported. This reaction utilizes DABSO, a safe and easy-to-handle alternative to SO2 gas. The reaction proceeds through a sulfinate intermediate, which can act as a lynchpin for the in situ generation of sulfones, sulfonamides, and sulfonyl fluorides. Good yields and scalability are demonstrated.
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Affiliation(s)
- Jonathan Bajohr
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Abdoul G Diallo
- Normandie Univ., LCMT, ENSICAEN, UNICAEN, CNRS, 14000 Caen, France
| | - Andrew Whyte
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
| | - Sylvain Gaillard
- Normandie Univ., LCMT, ENSICAEN, UNICAEN, CNRS, 14000 Caen, France
| | - Jean-Luc Renaud
- Normandie Univ., LCMT, ENSICAEN, UNICAEN, CNRS, 14000 Caen, France
| | - Mark Lautens
- Davenport Research Laboratories, Department of Chemistry, University of Toronto, 80 St. George Street, Toronto, Ontario M5S 3H6, Canada
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Keglevich G. Microwaves as "Co-Catalysts" or as Substitute for Catalysts in Organophosphorus Chemistry. Molecules 2021; 26:1196. [PMID: 33672361 PMCID: PMC7926777 DOI: 10.3390/molecules26041196] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2021] [Revised: 02/18/2021] [Accepted: 02/19/2021] [Indexed: 11/16/2022] Open
Abstract
The purpose of this review is to summarize the importance of microwave (MW) irradiation as a kind of catalyst in organophosphorus chemistry. Slow or reluctant reactions, such as the Diels-Alder cycloaddition or an inverse-Wittig type reaction, may be performed efficiently under MW irradiation. The direct esterification of phosphinic and phosphonic acids, which is practically impossible on conventional heating, may be realized under MW conditions. Ionic liquid additives may promote further esterifications. The opposite reaction, the hydrolysis of P-esters, has also relevance among the MW-assisted transformations. A typical case is when the catalysts are substituted by MWs, which is exemplified by the reduction of phosphine oxides, and by the Kabachnik-Fields condensation affording α-aminophosphonic derivatives. Finally, the Hirao P-C coupling reaction may serve as an example, when the catalyst may be simplified under MW conditions. All of the examples discussed fulfill the expectations of green chemistry.
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Affiliation(s)
- György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
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16
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Luo H, Sun K, Xie Q, Li X, Zhang X, Luo X. Copper‐Mediated Phosphorylation of Arylsilanes with H‐Phosphonate Diesters. ASIAN J ORG CHEM 2020. [DOI: 10.1002/ajoc.202000529] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Haiqing Luo
- Department of Chemistry & Chemical Engineering Gannan Normal University South Road of Normal University, Rongjiang New District Ganzhou Jiangxi 341000 P. R. China
| | - Kai Sun
- Department of Chemistry & Chemical Engineering Gannan Normal University South Road of Normal University, Rongjiang New District Ganzhou Jiangxi 341000 P. R. China
| | - Qi Xie
- Department of Chemistry & Chemical Engineering Gannan Normal University South Road of Normal University, Rongjiang New District Ganzhou Jiangxi 341000 P. R. China
| | - Xiaolan Li
- Department of Chemistry & Chemical Engineering Gannan Normal University South Road of Normal University, Rongjiang New District Ganzhou Jiangxi 341000 P. R. China
| | - Xiuqi Zhang
- Department of Chemistry & Chemical Engineering Gannan Normal University South Road of Normal University, Rongjiang New District Ganzhou Jiangxi 341000 P. R. China
| | - Xuzhong Luo
- Department of Chemistry & Chemical Engineering Gannan Normal University South Road of Normal University, Rongjiang New District Ganzhou Jiangxi 341000 P. R. China
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17
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Focusing on the Catal. of the Pd- and Ni-Catalyzed Hirao Reactions. Molecules 2020; 25:molecules25173897. [PMID: 32859095 PMCID: PMC7503744 DOI: 10.3390/molecules25173897] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 08/24/2020] [Accepted: 08/25/2020] [Indexed: 12/17/2022] Open
Abstract
The Hirao reaction involving the phosphinoylation or phosphonation of aryl halides by >P(O)H reagents is a P–C bond forming transformation belonging to the recently very hot topic of cross-couplings. The Pd- or Ni-catalyzed variations take place via the usual cycle including oxidative addition, ligand exchange, and reductive elimination. However, according to the literature, the nature of the transition metal catalysts is not unambiguous. In this feature article, the catalysts described for the Pd(OAc)2-promoted cases are summarized, and it is concluded that the “(HOY2P)2Pd(0)” species (Y = aryl, alkoxy) is the real catalyst. In our model, the excess of the >P(O)H reagent served as the P-ligand. During the less studied Ni(II)-catalyzed instances the “(HOY2P)(−OY2P)Ni(II)Cl−” form was found to enter the catalytic cycle. The newest conclusions involving the exact structure of the catalysts, and the mechanism for their formation explored by us were supported by our earlier experimental data and theoretical calculations.
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Henyecz R, Huszár B, Grenitzer V, Keglevich G. A Study on the Reactivity of Monosubstituted Benzenes in the MW-Assisted Pd(OAc)2-catalyzed Hirao Reaction with Ph2P(O)H and (EtO)2P(O)H Reagents. CURR ORG CHEM 2020. [DOI: 10.2174/1385272824999200403170827] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Abstract
The reactivity order of “iodobenzene > bromobenzene > phenyl trifluoromethanesulfonate”
was established in microwave (MW)-assisted Pd(OAc)2-catalyzed P–C
coupling reactions with diphenylphosphine oxide and diethyl phosphite, where the excess
of the these >P(O)H reagents served as the reducing agent, and, via its tautomeric >P-OH
form, also as the P-ligand. The P–C coupling of Ph2P(O)H with PhBr at 120 °C took place
via an induction period, during which the active “P-Pd-P” catalyst was formed from the
Pd(II) salt and the >P(O)H species. The lower reactivity of PhBr towards Ph2P(O)H could
be promoted by the addition of 20% of KI to the reaction mixture at 120 °C, or utilizing 1
equivalent of KI after a pre-reaction with PhBr at 120-150 °C followed by the P–C coupling
at 100 °C. The reactivity of PhOTf and a bromo analogue was compared in competitive couplings with
Ph2P(O)H. Beyond this, the reactivity of Ph2P(O)H and (EtO)2P(O)H towards PhOTf was evaluated in another
competitive experiment. Increasing the scale of the P–C coupling reaction of (EtO)2P(O)H with PhBr, the
quantity for the components of the catalyst could be decreased.
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Affiliation(s)
- Réka Henyecz
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - Bianka Huszár
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - Viktória Grenitzer
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
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19
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Keglevich G, Henyecz R, Mucsi Z. Experimental and Theoretical Study on the "2,2'-Bipiridyl-Ni-Catalyzed" Hirao Reaction of >P(O)H Reagents and Halobenzenes: A Ni(0) → Ni(II) or a Ni(II) → Ni(IV) Mechanism? J Org Chem 2020; 85:14486-14495. [PMID: 32407093 PMCID: PMC7684577 DOI: 10.1021/acs.joc.0c00804] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
![]()
It was found by us that the P–C
coupling reaction of >P(O)H
reagents with PhX (X = I and Br) in the presence of NiCl2/Zn as the precursors for the assumed Ni(0) complexant together with
2,2′-bipyridine as the ligand took place only with PhI at 50/70
°C. M06-2X/6-31G(d,p)//PCM(MeCN) calculations
for the reaction of Ph2P(O)H and PhX revealed a favorable
energetics only for the loss of iodide following the oxidative addition
of PhI on the Ni(0) atom. However, the assumed transition states with
Ni(II) formed after P-ligand uptake and deprotonation could not undergo
reductive elimination meaning a “dead-end route”. Hence,
it was assumed that the initial complexation of the remaining Ni2+ ions with 2,2′-bipyridine may move the P–C
coupling forward via a Ni(II) → Ni(IV) transition. This route
was also confirmed by calculations, and this mechanism was justified
by preparative experiments carried out using NiCl2/bipyridine
in the absence of Zn. Hence, the generally accepted Ni(0) →
Ni(II) route was refuted by us, confirming the generality of the Ni(II)
→ N(IV) protocol, either in the presence of bipyridine, or
using the excess of the >P(O)H reagent as the P-ligand.
The results of the calculations on the complex forming ability of
Ni(0) and Ni(II) with 2,2′-bipyridine or the P-reagents were in accord with our mechanistic proposition.
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Affiliation(s)
- György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - Réka Henyecz
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - Zoltán Mucsi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
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20
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Henyecz R, Mucsi Z, Keglevich G. A surprising mechanism lacking the Ni(0) state during the Ni(II)-catalyzed P–C cross-coupling reaction performed in the absence of a reducing agent – An experimental and a theoretical study. PURE APPL CHEM 2019. [DOI: 10.1515/pac-2019-1004] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The Hirao reaction, i.e. the P–C coupling between a bromoarene and a >P(O)H reagent performed in most cases in the presence of a Pd(0) complex incorporating a P-ligand may also be carried out applying a Ni(II) catalyst precursor with or without Zn or Mg as the reducing agent. The Ni catalysts may include P- or N-ligands. B3LYP/6-31G(d,p)//PCM(MeCN) quantum chemical calculations suggested that the mechanism of the NiX2 catalyzed (X=Cl or Br) P–C couplings performed in the absence of a reducing agent, and in the excess of the >P(O)H reagent serving as the P-ligand (via its tautomeric >POH form) is completely different from that of the Pd(OAc)2 promoted version, as no reduction of the Ni(II) occurs. In the two variations mentioned, the active catalyst is the dehydrobrominated species derived from primary complex [(HO)Y2P]2Ni(II)Br2, and the [(HO)Y2P]2Pd(0) complex itself, respectively. Both species undergo temporary oxidation (to “Ni(IV)” and “Pd(II)”, respectively) in the catalytic cycle. During the catalysis with “P2Ni(II)X2”, one of the P-ligands serves the >P(O)H function of the ArP(O)H < product. The consequence of this difference is that in the Ni(II)-catalyzed case, somewhat less >P(O)H-species is needed than in the Pd(0)-promoted instance. Applying 10 % of the Pd(OAc)2 or NiX2 precursor, the optimum quantity of the P-reagent is 1.3 equivalent and, in the first approach, 1.1 equivalent, respectively. Preparative experiments justified the new mechanism explored. The ligation of Ni(II) was also investigated by theoretical calculations. It was proved that the bis-complexation is the most favorable energetically as compared to the mono-, tri- and tetra-ligation.
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Affiliation(s)
- Réka Henyecz
- Department of Organic Chemistry and Technology , Budapest University of Technology and Economics , 1521 Budapest , Hungary
| | - Zoltán Mucsi
- Department of Organic Chemistry and Technology , Budapest University of Technology and Economics , 1521 Budapest , Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology , Budapest University of Technology and Economics , 1521 Budapest , Hungary
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21
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Chen L, Zhou Z, Zhang S, Li X, Ma X, Dong J. Palladium(ii)-catalyzed oxidative C(sp 3)-P bond formation via C(sp 3)-H bond activation. Chem Commun (Camb) 2019; 55:13693-13696. [PMID: 31657375 DOI: 10.1039/c9cc07637a] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Disclosed herein is a Pd(ii)-catalyzed C(sp3)-H/P-H oxidative cross-coupling reaction between 8-methylquinolines with H-phosphonates or diarylphosphine oxides via chelation-assisted C(sp3)-H bond activation. The protocol exhibits a relatively broad functional-group tolerance and exclusive chemo- and regioselectivity. Furthermore, detailed mechanistic studies support the proposed reaction pathway.
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Affiliation(s)
- Lijin Chen
- School of Chemistry and Chemical Engineering, Southwest University, No. 2 Tiansheng Road, Beibei, Chongqing 400715, People's Republic of China.
| | - Zhenfei Zhou
- School of Chemistry and Chemical Engineering, Southwest University, No. 2 Tiansheng Road, Beibei, Chongqing 400715, People's Republic of China.
| | - Saifei Zhang
- School of Chemistry and Chemical Engineering, Southwest University, No. 2 Tiansheng Road, Beibei, Chongqing 400715, People's Republic of China.
| | - Xiaoqian Li
- School of Chemistry and Chemical Engineering, Southwest University, No. 2 Tiansheng Road, Beibei, Chongqing 400715, People's Republic of China.
| | - Xuebing Ma
- School of Chemistry and Chemical Engineering, Southwest University, No. 2 Tiansheng Road, Beibei, Chongqing 400715, People's Republic of China.
| | - Jiaxing Dong
- School of Chemistry and Chemical Engineering, Southwest University, No. 2 Tiansheng Road, Beibei, Chongqing 400715, People's Republic of China.
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22
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Henyecz R, Oroszy R, Keglevich G. Microwave-Assisted Hirao Reaction of Heteroaryl Bromides and >P(O)H Reagents Using Pd(OAc)2 as the Catalyst Precursor in the Absence of Added P-Ligands. CURR ORG CHEM 2019. [DOI: 10.2174/1385272823666190621114915] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Bromopyridines, bromotiophenes and 3-bromofuran were reacted with diphenylphosphine oxide or diethyl phosphite under microwave irradiation using Pd(OAc)2 as the catalyst precursor together with some excess of the >P(O)H reagent. Hence, there was no need for the usual mono- and bidentate P-ligands. The >P(O)-functionalized heterocycles were obtained in variable (55-95%) yields. The results of our “green” protocol were in most cases better than those of the literature methods.
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Affiliation(s)
- Réka Henyecz
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - Rafaella Oroszy
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
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23
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Keglevich G, Kiss NZ, Bálint E, Henyecz R, Grün A, Mucsi Z. Microwave irradiation and catalysis in organophosphorus chemistry. PHOSPHORUS SULFUR 2019. [DOI: 10.1080/10426507.2018.1521406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Nóra Zsuzsa Kiss
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Erika Bálint
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Réka Henyecz
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Alajos Grün
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Zoltán Mucsi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
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24
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Henyecz R. Microwave-assisted synthesis of phosphonic and phosphinic esters and phosphine oxides by the Hirao reaction. PHOSPHORUS SULFUR 2019. [DOI: 10.1080/10426507.2018.1544983] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Affiliation(s)
- Réka Henyecz
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
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25
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Xiong B, Wang G, Zhou C, Liu Y, Yang CA, Zhang P, Tang K, Zhou Q. Organocatalytic, regioselective allylic- and 1,6-substitution of quinone monoketals with diaryl H-phosphine oxides. J Organomet Chem 2019. [DOI: 10.1016/j.jorganchem.2018.12.020] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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26
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Application of the Microwave Technique in Continuous Flow Processing of Organophosphorus Chemical Reactions. MATERIALS 2019; 12:ma12050788. [PMID: 30866480 PMCID: PMC6427270 DOI: 10.3390/ma12050788] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2019] [Revised: 02/28/2019] [Accepted: 03/01/2019] [Indexed: 12/22/2022]
Abstract
The microwave (MW) technique is an efficient tool in the realization of organic reactions, as well as in the analytical field and in the food industry. The continuous flow approach is of special interest as a promising way to scale-up MW-assisted syntheses. Besides summarizing the batch precedents, this review focuses on the utilization of the MW technique in the continuous-flow realization of organophosphorus transformations. The advantages of the continuous flow technique against the batch accomplishment are also shown. A few materials chemistry-related applications are also mentioned.
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27
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Keglevich G, Kiss NZ, Henyecz R, Mucsi Z. Microwave irradiation and catalysis in organophosphorus reactions. PURE APPL CHEM 2019. [DOI: 10.1515/pac-2018-0501] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Abstract
Abstract
The usual advantage of microwave (MW) assistance is making organic reactions faster and more efficient. In this article we present reaction types from organophosphorus chemistry, when MW-assisted transformations (e.g. the direct esterification and alkylating esterification of phosphinic acids) may be promoted by suitable catalysts, or vice versa, when a catalytic reaction is enhanced by MW irradiation (e.g. the Arbuzov reaction of aryl halides), and when catalysts may be omitted or simplified under MW irradiation as shown by the alkylation of active methylene containing P=O substrates/the Kabachnik–Fields reaction/deoxygenation of phosphine oxides, and the Hirao reaction, respectively.
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Affiliation(s)
- György Keglevich
- Department of Organic Chemistry and Technology , Budapest University of Technology and Economics , 1521 Budapest , Hungary
| | - Nóra Zsuzsa Kiss
- Department of Organic Chemistry and Technology , Budapest University of Technology and Economics , 1521 Budapest , Hungary
| | - Réka Henyecz
- Department of Organic Chemistry and Technology , Budapest University of Technology and Economics , 1521 Budapest , Hungary
| | - Zoltán Mucsi
- Department of Organic Chemistry and Technology , Budapest University of Technology and Economics , 1521 Budapest , Hungary
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28
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Ghasemzadeh MS, Akhlaghinia B. C–P bond construction catalyzed by NiII immobilized on aminated Fe3O4@TiO2 yolk–shell NPs functionalized by (3-glycidyloxypropyl)trimethoxysilane (Fe3O4@TiO2 YS-GLYMO-UNNiII) in green media. NEW J CHEM 2019. [DOI: 10.1039/c9nj00352e] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
An efficient, versatile and novel method for the C–P cross-coupling reaction with a high yield of products using Fe3O4@TiO2YS-GLYMO-UNNiII as a magnetic nanostructured catalyst in the presence of WERSA was reported.
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Affiliation(s)
- Maryam Sadat Ghasemzadeh
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad
- Mashhad 9177948974
- Iran
| | - Batool Akhlaghinia
- Department of Chemistry, Faculty of Science, Ferdowsi University of Mashhad
- Mashhad 9177948974
- Iran
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29
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Henyecz R, Keglevich G. New Developments on the Hirao Reactions, Especially from "Green" Point of View. Curr Org Synth 2019; 16:523-545. [PMID: 31984929 PMCID: PMC7432197 DOI: 10.2174/1570179416666190415110834] [Citation(s) in RCA: 23] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2019] [Revised: 02/19/2019] [Accepted: 03/12/2019] [Indexed: 01/08/2023]
Abstract
BACKGROUND The Hirao reaction discovered ca. 35 years ago is an important P-C coupling protocol between dialkyl phosphites and aryl halides in the presence of Pd(PPh3)4 as the catalyst and a base to provide aryl phosphonates. Then, the reaction was extended to other Preagents, such as secondary phosphine oxides and H-phosphinates and to other aryl and hetaryl derivatives to afford also phosphinic esters and tertiary phosphine oxides. Instead of the Pd(PPh3)4 catalyst, Pd(OAc)2 and Ni-salts were also applied as catalyst precursors together with a number of mono- and bidentate P-ligands. OBJECTIVE In our review, we undertook to summarize the target reaction with a special stress on the developments attained in the last 6 years, hence this paper is an update of our earlier reviews in a similar topic. CONCLUSIONS "Greener" syntheses aimed at utilizing phase transfer catalytic and microwave-assisted approaches, even under "P-ligand-free. or even solvent-free conditions are the up-to date versions of the classical Hirao reaction. The mechanism of the reaction is also in the focus these days.
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Affiliation(s)
- Réka Henyecz
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521Budapest, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521Budapest, Hungary
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30
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Henyecz R, Mucsi Z, Keglevich G. Palladium-catalyzed microwave-assisted Hirao reaction utilizing the excess of the diarylphosphine oxide reagent as the P-ligand; a study on the activity and formation of the “PdP2” catalyst. PURE APPL CHEM 2018. [DOI: 10.1515/pac-2018-1004] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
The microwave-assisted Hirao reaction of bromobenzene and diarylphosphine oxides was performed at 120 °C using triethylamine as the base, and 5% of palladium acetate as the catalyst in ethanol. 5% Excess of the >P(O)H reagent served as the reducing agent, while another 10% as the preligand (in the >POH tautomeric form). It was found that the P–C coupling reaction was significantly faster with (2-MeC6H4)2P(O)H (A) and (3,5-diMeC6H3)2P(O)H (B), than with Ph2P(O)H (C) and (4-MeC6H4)2P(O)H (D). Moreover, species A and B could be applied as selective P-ligands in the reaction of bromobenzene with C or D. Dependence of the effectiveness of “PdP2” catalysts with diarylphosphine oxide preligands on the methyl substituents followed a reversed order as the reactivity of the diarylphosphine oxide species in the P–C coupling itself. Formation of the “PdP2” catalyst from palladium acetate and diarylphosphine oxide has never been studied, but now it was evaluated by us at the B3LYP level of theory applying 6-31G(d,p) for C,H,P,O and SDD/MW28 for Pd including the explicit-implicit solvent model. The novel mechanism requiring three equivalents of the >P(O)H species for each of the palladium acetate molecule was in agreement with the preparative experiments. The ligation of palladium(0) with different P(III) species comprising the >POH form of the >P(O)H reagent was also studied, and the critical role of the steric hindrance on the ligation, and hence on the activity of the “PdP2” catalyst was substantiated. Last but not least, the influence of the Me substituents in the aromatic ring of the P-reagents on the energetics of the elemental steps of the Hirao reaction itself was also evaluated.
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Affiliation(s)
- Réka Henyecz
- Department of Organic Chemistry and Technology , Budapest University of Technology and Economics , Budapest 1521 , Hungary
| | - Zoltán Mucsi
- Department of Organic Chemistry and Technology , Budapest University of Technology and Economics , Budapest 1521 , Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology , Budapest University of Technology and Economics , Budapest 1521 , Hungary
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31
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Jójárt R, Pécsy S, Keglevich G, Szécsi M, Rigó R, Özvegy-Laczka C, Kecskeméti G, Mernyák E. Pd-Catalyzed microwave-assisted synthesis of phosphonated 13α-estrones as potential OATP2B1, 17β-HSD1 and/or STS inhibitors. Beilstein J Org Chem 2018; 14:2838-2845. [PMID: 30498534 PMCID: PMC6244214 DOI: 10.3762/bjoc.14.262] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2018] [Accepted: 10/30/2018] [Indexed: 01/13/2023] Open
Abstract
Novel 2- or 4-phosphonated 13α-estrone derivatives were synthesized via the Hirao reaction. Bromo regioisomers (2- or 4-) of 13α-estrone and its 3-benzyl or 3-methyl ether were reacted with diethyl phosphite or diphenylphosphine oxide using Pd(PPh3)4 as catalyst under microwave irradiation. The influence of the new compounds on the transport function of the organic anion transporting polypeptide OATP2B1 was investigated by measuring Cascade Blue uptake. Derivatives bearing a 3-benzyl ether function displayed substantial submicromolar OATP2B1 inhibitory activity. The inhibitory effects of the compounds on human placental steroid sulfatase (STS) and 17β-hydroxysteroid dehydrogenase type 1 isozyme (17β-HSD1) were investigated by in vitro radiosubstrate incubation methods. None of the test compounds inhibited the STS markedly. The structure-activity relationship evaluation revealed that 2-substituted 3-hydroxy derivatives are able to inhibit the 17β-HSD1 enzyme with submicromolar IC50 values. Dual OATP2B1 and 17β-HSD1 inhibitors have been identified.
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Affiliation(s)
- Rebeka Jójárt
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
| | - Szabolcs Pécsy
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
| | - Mihály Szécsi
- 1st Department of Medicine, University of Szeged, Korányi fasor 8-10, H-6720 Szeged, Hungary
| | - Réka Rigó
- Membrane protein research group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Csilla Özvegy-Laczka
- Membrane protein research group, Institute of Enzymology, Research Centre for Natural Sciences, Hungarian Academy of Sciences, Magyar tudósok körútja 2, H-1117 Budapest, Hungary
| | - Gábor Kecskeméti
- Department of Medicinal Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
| | - Erzsébet Mernyák
- Department of Organic Chemistry, University of Szeged, Dóm tér 8, H-6720 Szeged, Hungary
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32
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Keglevich G, Henyecz R, Mucsi Z, Kiss NZ. The Palladium Acetate-Catalyzed Microwave-Assisted Hirao Reaction without an Added Phosphorus Ligand as a "Green" Protocol: A Quantum Chemical Study on the Mechanism. Adv Synth Catal 2017; 359:4322-4331. [PMID: 29399016 PMCID: PMC5767766 DOI: 10.1002/adsc.201700895] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/18/2017] [Revised: 10/03/2017] [Indexed: 12/21/2022]
Abstract
It was proved by our experiments that on microwave irradiation, the mono‐ or bidentate phosphorus ligands generally applied in the palladium(II)‐catalyzed P–C coupling reaction of aryl bromides and dialkyl phosphites or secondary phosphine oxides may be substituted by the excess of the >P(O)H reagent that exists under a tautomeric equilibrium. Taking into account that the reduction of the palladium(II) salt and the ligation of the palladium(0) so formed requires 3 equivalents of the P‐species for the catalyst applied in a quantity of 5–10%, all together, 15–30% of the P‐reagent is necessary beyond its stoichiometric quantity. In the coupling reaction of diphenylphosphine oxide, it was possible to apply diethyl phosphite as the reducing agent and as the P‐ligand. The reactivities of the diethyl phosphite and diphenylphosphine oxide reagents were compared in a competitive reaction. The mechanism and the energetics of this new variation of the Hirao reaction of bromobenzene with Y2P(O)H reagents (Y=EtO and Ph) was explored by quantum chemical calculations. The first detailed study on simple reaction models justified our assumption that, under the conditions of the reaction, the trivalent form of the >P(O)H reagent may serve as the P‐ligand in the palladium(0) catalyst, and shed light on the fine mechanism of the reaction sequence. The existence of the earlier described bis(palladium complex) {[H(OPh2P)2PdOAc]2} was refuted by high level theoretical calculations. This kind of complex may be formed only with chloride anions instead of the acetate anion. The interaction of palladium acetate and Y2P(O)H may result in only the formation of the [(HO)Y2P]2Pd complex that is the active catalyst in the Hirao reaction. The new variation of the Hirao reaction is of a more general value, and represents the greenest protocol, as there is no need for the usual P‐ligands. Instead, the >P(O)H reagent should be used in an excess of up to 30%. Hence, the costs and environmental burdens may be decreased. ![]()
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Affiliation(s)
- György Keglevich
- Department of Organic Chemistry and Technology Budapest University of Technology and Economics 1521 Budapest Hungary
| | - Réka Henyecz
- Department of Organic Chemistry and Technology Budapest University of Technology and Economics 1521 Budapest Hungary
| | - Zoltán Mucsi
- Department of Organic Chemistry and Technology Budapest University of Technology and Economics 1521 Budapest Hungary
| | - Nóra Zs Kiss
- Department of Organic Chemistry and Technology Budapest University of Technology and Economics 1521 Budapest Hungary
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