1
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Keglevich G, Varga PR, Dinnyési E, Szalai Z, Bősze S, Rita OS, Drahos L, Karaghiosoff K. N-Functionalization of β-aminophosphonates: cytotoxic effects of the new derivatives. Org Biomol Chem 2024. [PMID: 38682553 DOI: 10.1039/d4ob00243a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/01/2024]
Abstract
β-Aminophosphonates obtained by the Michael addition of primary amines to the double bond of diethyl vinylphosphonate proved to be suitable starting materials (amine components) in the Kabachnik-Fields reaction with formaldehyde and dialkyl phosphites or secondary phosphine oxides to afford N-phosphonylmethyl- and N-phosphinoylmethyl-β-aminophosphonates. On the other hand, the starting aminophosphonates were modified by N-acylation using acid chlorides. The N-acyl products were found to exist in a dynamic equilibrium of two conformers as suggested by the broad NMR signals. At 26 °C, there may be rotation around the N-C axis of the acylamide function. At the same time, low-temperature NMR measurements at -5 °C revealed the presence of two distinct rotamers that could be characterized by 31P, 13C and 1H NMR data. The modified β-aminophosphonic derivatives were subjected to a comparative structure-activity analysis on MDA-MB-231, PC-3, A431 and Ebc-1 tumor cell lines, and in a few cases, significant activity was detected.
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Affiliation(s)
- György Keglevich
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary.
| | - Petra Regina Varga
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary.
| | - Emőke Dinnyési
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary.
| | - Zsuzsanna Szalai
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary.
| | - Szilvia Bősze
- HUN-REN-ELTE, Research Group of Peptide Chemistry, Hungarian Research Network, H-1117 Budapest, Hungary
| | - Oláhné Szabó Rita
- HUN-REN-ELTE, Research Group of Peptide Chemistry, Hungarian Research Network, H-1117 Budapest, Hungary
- Department of Genetics, Cell- and Immunobiology, Semmelweis University, Nagyvárad tér 4, H-1089 Budapest, Hungary
| | - László Drahos
- MS Proteomics Research Group, Research Centre for Natural Sciences, H-1117 Budapest, Hungary
| | - Konstantin Karaghiosoff
- Department Chemie, Ludwig-Maximilians-Universitat München, Butenandtstr. 5-13, D-81377 München, Germany.
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2
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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3
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Varga PR, Keglevich G. The Last Decade of Optically Active α-Aminophosphonates. Molecules 2023; 28:6150. [PMID: 37630402 PMCID: PMC10459122 DOI: 10.3390/molecules28166150] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2023] [Revised: 08/10/2023] [Accepted: 08/17/2023] [Indexed: 08/27/2023] Open
Abstract
α-Aminophosphonates and related compounds are important due to their real and potential biological activity. α-Aminophosphonates may be prepared by the Kabachnik-Fields condensation of oxo compounds, amines and dialkyl phosphites, or by the aza-Pudovik addition of the same P-reagents to imines. In this review, the methods that allow for the synthesis of α-aminophosphonates with optical activity are surveyed. On the one hand, optically active catalysts or ligands may induce enantioselectivity during the Kabachnik-Fields reaction. On the other hand, asymmetric catalysis during the aza-Pudovik reaction, or hydrogenations of iminophosphonates, may prove to be a useful tool. Lastly yet importantly, it is possible to start from optically active reagents that may be associated with diastereoselectivity. The "green" aspects of the different syntheses are also considered.
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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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4
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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5
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Szalai Z, Tóth B, Szabó RO, Bősze S, Karaghiosoff K, Czugler M, Drahos L, Keglevich G. A Study of the Bisphosphonic Derivatives from the Pudovik Reaction of Dialkyl α-Oxophosphonates and >P(O)H Reagents: X-ray Structure and Bioactivity. Molecules 2023; 28:6037. [PMID: 37630289 PMCID: PMC10459769 DOI: 10.3390/molecules28166037] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 08/07/2023] [Accepted: 08/10/2023] [Indexed: 08/27/2023] Open
Abstract
New hydroxy-methylenebisphosphonic derivatives were prepared with different P-functions. The outcome of the reaction of α-oxophosphonates (YC(O)P(O)(OR)2) and dialkyl phosphites or diarylphosphine oxides depended on the Y substituent of the oxo-compound, the nature of the P-reagent and the amount of the diethylamine catalyst. Starting from dimethyl α-oxoethylphosphonate, in the presence of 5% of diethylamine, the corresponding Pudovik adduct was the single product. While using 40% of the catalyst, the rearranged species with the >P(O)-O-CH-P(O)< skeleton was the exclusive component. A similar reaction of α-oxobenzylphosphonate followed the rearrangement protocol. X-ray crystallography revealed not only the spatial structures of the three products, but also an intricate pattern evolving from the interplay of slight chemical differences, solvent inclusion and disorder as well as H-bridge patterns, which invite further investigation. In vitro activity of the compounds was assessed on different tumor cell cultures using end-point-type cell tetrazolium-based measurements. These structure-activity studies revealed a cytostatic effect for four rearranged derivatives containing aromatic units. One of them had a pronounced effect on MDA-MB 231 and Ebc-1 cells, showing IC50 = 37.8 and 25.9 µM, respectively.
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Affiliation(s)
- Zsuzsanna Szalai
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1521 Budapest, Hungary; (Z.S.); (B.T.); (M.C.)
| | - Boldizsár Tóth
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1521 Budapest, Hungary; (Z.S.); (B.T.); (M.C.)
| | - Rita Oláhné Szabó
- Eötvös Loránd Research Network (ELKH), Research Group of Peptide Chemistry, Eötvös Loránd University, 1117 Budapest, Hungary; (R.O.S.); (S.B.)
- Department of Genetics, Cell and Immunobiology, Semmelweis University, Nagyvárad tér 4, 1089 Budapest, Hungary
| | - Szilvia Bősze
- Eötvös Loránd Research Network (ELKH), Research Group of Peptide Chemistry, Eötvös Loránd University, 1117 Budapest, Hungary; (R.O.S.); (S.B.)
| | - Konstantin Karaghiosoff
- Department Chemie, Ludwig-Maximilians-Universitat München, Butenandtstr. 5-13, D-81377 München, Germany;
| | - Mátyás Czugler
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1521 Budapest, Hungary; (Z.S.); (B.T.); (M.C.)
| | - 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; (Z.S.); (B.T.); (M.C.)
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6
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Kocsis D, Varga PR, Keshwan R, Nader M, Lengyel M, Szabó P, Antal I, Kánai K, Keglevich G, Erdő F. Transdermal Delivery of α-Aminophosphonates as Semisolid Formulations-An In Vitro-Ex Vivo Study. Pharmaceutics 2023; 15:pharmaceutics15051464. [PMID: 37242706 DOI: 10.3390/pharmaceutics15051464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Revised: 05/05/2023] [Accepted: 05/09/2023] [Indexed: 05/28/2023] Open
Abstract
α-Aminophosphonates are organophosphorus compounds with an obvious similarity with α-amino acids. Owing to their biological and pharmacological characteristics, they have attracted the attention of many medicinal chemists. α-Aminophosphonates are known to exhibit antiviral, antitumor, antimicrobial, antioxidant and antibacterial activities, which can all be important in pathological dermatological conditions. However, their ADMET properties are not well studied. The aim of the current study was to provide preliminary information about the skin penetration of three preselected α-aminophosphonates when applying them as topical cream formulations in static and dynamic diffusion chambers. The results indicate that aminophosphonate 1a, without any substituent in the para position, shows the best release from the formulation and the highest absorption through the excised skin. However, based on our previous study, the in vitro pharmacological potency was higher in the case of para-substituted molecules 1b and 1c. The particle size and rheological studies revealed that the 2% cream of aminophosphonate 1a was the most homogenous formulation. In conclusion, the most promising molecule was 1a, but further experiments are proposed to uncover the possible transporter interactions in the skin, optimize the topical formulations and improve PK/PD profiles in case of transdermal delivery.
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Affiliation(s)
- Dorottya Kocsis
- Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Práter u. 50a, H-1083 Budapest, Hungary
| | - Petra Regina Varga
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
| | - Rusul Keshwan
- Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Práter u. 50a, H-1083 Budapest, Hungary
| | - Mina Nader
- Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Práter u. 50a, H-1083 Budapest, Hungary
| | - Miléna Lengyel
- Department of Pharmaceutics, Semmelweis University, H-1092 Budapest, Hungary
| | - Pál Szabó
- Centre for Structural Study, Research Centre for Natural Sciences, H-1117 Budapest, Hungary
| | - István Antal
- Department of Pharmaceutics, Semmelweis University, H-1092 Budapest, Hungary
| | - Károly Kánai
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
| | - Franciska Erdő
- Faculty of Information Technology and Bionics, Pázmány Péter Catholic University, Práter u. 50a, H-1083 Budapest, Hungary
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7
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Varga PR, Szabó RO, Dormán G, Bősze S, Keglevich G. Cytotoxic Activity of α-Aminophosphonic Derivatives Coming from the Tandem Kabachnik–Fields Reaction and Acylation. Pharmaceuticals (Basel) 2023; 16:ph16040506. [PMID: 37111263 PMCID: PMC10144033 DOI: 10.3390/ph16040506] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2023] [Revised: 03/17/2023] [Accepted: 03/27/2023] [Indexed: 03/31/2023] Open
Abstract
Encouraged by the significant cytotoxic activity of simple α-aminophosphonates, a molecular library comprising phosphonoylmethyl- and phosphinoylmethyl-α-aminophosphonates, a tris derivative, and N-acylated species was established. The promising aminophosphonate derivatives were subjected to a comparative structure–activity analysis. We evaluated 12 new aminophosphonate derivatives on tumor cell cultures of different tissue origins (skin, lung, breast, and prostate). Several derivatives showed pronounced, even selective cytostatic effects. According to IC50 values, phosphinoylmethyl-aminophosphonate derivative 2e elicited a significant cytostatic effect on breast adenocarcinoma cells, but it was even more effective against prostatic carcinoma cells. Based on our data, these new compounds exhibited promising antitumor activity on different tumor types, and they might represent a new group of alternative chemotherapeutic agents.
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Affiliation(s)
- Petra R. Varga
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - Rita Oláhné Szabó
- ELKH-ELTE Research Group of Peptide Chemistry, Eötvös Loránd Research Network (ELKH), Eötvös Loránd University (ELTE), 1117 Budapest, Hungary
- Department of Genetics, Cell and Immunobiology, Semmelweis University, 1089 Budapest, Hungary
| | - György Dormán
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
- TargetEx Biosciences, Ltd., 2120 Dunakeszi, Hungary
| | - Szilvia Bősze
- ELKH-ELTE Research Group of Peptide Chemistry, Eötvös Loránd Research Network (ELKH), Eötvös Loránd University (ELTE), 1117 Budapest, Hungary
- Correspondence: (S.B.); (G.K.); Tel.: +36-1-463-1111 (ext. 5883) (G.K.)
| | - György Keglevich
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
- Correspondence: (S.B.); (G.K.); Tel.: +36-1-463-1111 (ext. 5883) (G.K.)
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8
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Varga PR, Karaghiosoff K, Sári ÉV, Simon A, Hegedűs L, Drahos L, Keglevich G. New N-acyl- as well as N-phosphonoylmethyl- and N-phosphinoylmethyl-α-amino-benzylphosphonates by acylation and a tandem Kabachnik-Fields protocol. Org Biomol Chem 2023; 21:1709-1718. [PMID: 36723166 DOI: 10.1039/d3ob00010a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Diethyl α-benzylamino- and α-amino-benzylphosphonates obtained by the Kabachnik-Fields reaction were useful intermediates in the synthesis of other derivatives. Acylation of α-aminophosphonates with acyl chlorides led to the corresponding N-acyl species existing under a dynamic equilibrium of two conformers. Judging from the broad NMR signals, the sterically most crowded N-benzoyl-N-benzyl derivative suffered a hindered rotation around the N-C axis to the acyl carbon atom at 26 °C. Low temperature NMR measurements at -10 °C showed the presence of two distinct rotamers that were characterized. The other acylated α-amino-benzylphosphonates prepared revealed a less hindered rotation. Single crystal X-ray diffraction of the NH-propionyl species showed a dimer, in which the two molecules were held together by rare intermolecular PO⋯HN bonds. On the other hand, substituted α-benzylamino-benzylphosphonates prepared by phospha-Mannich reactions were employed, as a new approach, in a second Kabachnik-Fields condensation by reaction with formaldehyde and dialkyl phosphites or secondary phosphine oxides to afford novel N-phosphonoylmethyl- and N-phosphinoylmethyl-α-amino-benzylphosphonates. The structure of the new products was confirmed by two-dimensional NMR spectroscopy. A symmetrical bis derivative was prepared in a diastereoselective manner. A related tris(phosphonoylmethyl)amine species was also synthesized.
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Affiliation(s)
- Petra Regina Varga
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary.
| | - Konstantin Karaghiosoff
- Department Chemie, Ludwig-Maximilians-Universitat München, Butenandtstr. 5-13, D-81377 München, Germany
| | - Éva Viktória Sári
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary.
| | - András Simon
- Department of Inorganic and Analytical Chemistry, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - László Hegedűs
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 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, Műegyetem rkp. 3, H-1111 Budapest, Hungary.
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9
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Keglevich G, Harsági N, Drahos L, Zsuzsa Kiss N. Synthesis of Phosphonates with Identical and Different Alkyl Groups by the Microwave-Assisted Alkylation of Phosphonic Ester-Acid Derivatives. Chempluschem 2023; 88:e202200342. [PMID: 36420946 DOI: 10.1002/cplu.202200342] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/05/2022] [Revised: 10/28/2022] [Indexed: 11/25/2022]
Abstract
Monoalkyl phosphonic derivatives obtained by the microwave (MW)- and ionic liquid-promoted direct esterification of alkylphosphonic acids were converted to the corresponding dialkyl alkylphosphonates on reaction with alkyl halides in the presence of triethylamine, under solvent-free MW-assisted conditions. Derivatives with different alkoxy groups were also synthesized. A minor "disproportionation" side reaction was identified during the preparation of dialkyl alkylphosphonates with different alkoxy groups. All together 12 alkylphosphonates were prepared by the efficient method developed.
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Affiliation(s)
- György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521, Budapest, Hungary
| | - Nikoletta Harsági
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521, Budapest, Hungary
| | - László Drahos
- MS Proteomics Research Group, Research Centre for Natural Sciences, 1117, Budapest, Hungary
| | - Nóra Zsuzsa Kiss
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521, Budapest, Hungary
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10
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Keglevich G. Organophosphorus chemistry: from model to application. Beilstein J Org Chem 2023; 19:89-90. [PMID: 36761475 PMCID: PMC9887740 DOI: 10.3762/bjoc.19.8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 01/20/2023] [Indexed: 01/26/2023] Open
Affiliation(s)
- György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
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11
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Keglevich G. The Application of Microwaves in the Esterification of P-acids. CMIC 2023. [DOI: 10.2174/2213335610666230105162405] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
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12
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Keglevich G. Organophosphorus Chemistry 2021. Molecules 2023; 28:molecules28010394. [PMID: 36615588 PMCID: PMC9823501 DOI: 10.3390/molecules28010394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 12/29/2022] [Indexed: 01/04/2023] Open
Abstract
Forty years have passed since a real "phosphabenzene" (a phosphinine) was prepared for the first time applying steric protection methodology with the sterically demanding 2,4,6-tri-tertiary-butylphenyl ("supermesityl") group [...].
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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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13
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Bölcskei H, Andrea NH, Keglevich G. Synthesis of 5-membered Heteroaryl-substituted Benzyloxy-benzaldehydes by the Suzuki-Miyaura Coupling Reaction. CURR ORG CHEM 2022. [DOI: 10.2174/1385272827666221219114255] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Abstract:
In medicinal chemistry, benzyloxy-benzaldehyde is a valuable intermediate, to which the attachment of a five membered heterocycle may be advantageous from the point of view of drug design. The starting iodo-benzyloxy-benzaldehydes were synthesized by the O-benzylation of o-, m- and p-hydroxybenzaldehydes with 2-, 3- and 4-iodobenzylbromides in refluxing acetone or acetonitrile in the presence of potassium carbonate and potassium iodide. Starting from the corresponding iodo-benzyloxy-benzaldehydes, the Suzuki-Miyaura carbon-carbon cross-coupling reaction was utilized to get five membered heteroaryl-substituted benzyloxy-benzaldehydes. Various methods for Suzuki cross-coupling were studied. The applied boronic acids were 2- and 3-thiophene-boronic acids, as well as 2- and 3-furan-boronic acids. The reactions were followed by TLC and HPLC-UV-MS analysis. The products were purified by column chromatography. The original Suzuki method comprising NaOEt/EtOH, tetrakis(triphenylphosphine)palladium, in toluene was applied only in a few cases, resulting in poor yields. In several cases, the Suzuki coupling of substituted aryl iodides with 2-furanboronic acid failed to result in the formation of the expected products using the palladium acetate/tri(o-tolyl)phosphine/aqueous tripotassium phosphate/dimethoxyethan system. But reacting 3-thiophene-boronic acids with the corresponding iodo-benzyloxybenzaldehydes, this method afforded the products in 76-99 % yields. The more powerful tetrakis(triphenylphosphine)palladium/
aqueous cesium carbonate/dimethylformamide system seemed to be more successful in cases of 2-thiophene boronic acid as well as 2- and 3-furan-boronic acids, providing the desired products in 75-93% yield. Twenty-six new compounds were synthesized.
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Affiliation(s)
- Hedvig Bölcskei
- Gedeon Richter Plc. Budapest, 10., Gyömrői út 30-32. Budapest, 10. Pf. 27. H-1475 Hungary
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics H-1521 Budapest, P.O. Box: 91., Budapest, Műegyetem rkp.3. H-1111 Hungary
| | - Német-Hanzelik Andrea
- Gedeon Richter Plc. Budapest, 10., Gyömrői út 30-32. Budapest, 10. Pf. 27. H-1475 Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics H-1521 Budapest, P.O. Box: 91., Budapest, Műegyetem rkp.3. H-1111 Hungary
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14
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Timári I, Bagi P, Keglevich G, E. Kövér K. Ultrahigh-Resolution Homo- and Heterodecoupled 1H and TOCSY NMR Experiments. ACS Omega 2022; 7:43283-43289. [PMID: 36467931 PMCID: PMC9713892 DOI: 10.1021/acsomega.2c06102] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/21/2022] [Accepted: 11/01/2022] [Indexed: 06/17/2023]
Abstract
The original homonuclear decoupled (pure shift) experiments provide ultrahigh-resolution 1H spectra of compounds containing NMR-active heteronuclei of low natural isotopic abundance (e.g., 13C or 15N). In contrast, molecules containing highly abundant heteronuclei (like 31P or 19F) give doublets or a multiple of doublets in their homonuclear decoupled spectra, depending on the number of heteronuclear coupling partners and the magnitude of the respective coupling constants. In these cases, the complex and frequently overlapping signals may hamper the unambiguous assignment of resonances. Here, we present new heteronuclear decoupled (HD) PSYCHE 1H and TOCSY experiments, which result in simplified spectra with significantly increased resolution, allowing the reliable assessment of individual resonances. The utility of the experiments has been demonstrated on a challenging stereoisomeric mixture of a platinum-phosphine complex, where ultrahigh resolution of the obtained HD PSYCHE spectra made the structure elucidation of the chiral products feasible. HD PSYCHE methods can be potentially applied to other important 31P- or 19F-containing compounds in medicinal chemistry and metabolomics.
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Affiliation(s)
- István Timári
- Department
of Organic Chemistry, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
| | - Péter Bagi
- Department
of Organic Chemistry and Technology, Budapest
University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
| | - György Keglevich
- Department
of Organic Chemistry and Technology, Budapest
University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
| | - Katalin E. Kövér
- Department
of Inorganic and Analytical Chemistry, University
of Debrecen, Egyetem
tér 1, H-4032 Debrecen, Hungary
- ELKH-DE
Molecular Recognition and Interaction Research Group, University of Debrecen, Egyetem tér 1, H-4032 Debrecen, Hungary
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15
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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] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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16
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Keglevich G, Harsági N, Kiss NZ, Drahos L. Synthesis of Cyclic Phosphinates by Microwave-Assisted Ionic-Liquid-Promoted Alcoholysis. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1504-8924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AbstractA series of 1-alkoxy-3-methyl- and 3,4-dimethyl-3-phospholene 1-oxides, as well as 1-alkoxy-3-methylphospholane 1-oxides were prepared in good yields by the microwave (MW)-assisted [bmim][PF6]-catalyzed transesterification of the corresponding methyl or ethyl esters. The alcoholyses studied represent another case, where MW irradiation has had a crucial role on the course of the reaction. The method developed is an alternative possibility to other esterifications starting from the corresponding phosphinic chlorides and acids.
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Affiliation(s)
- György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics
| | - Nikoletta Harsági
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics
| | - Nóra Zsuzsa Kiss
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics
| | - László Drahos
- Research Centre for Natural Sciences, MS Proteomics Research Group
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Ábrányi-Balogh P, Harsági N, Drahos L, Keglevich G. A Study on the Direct Esterification of Monoalkylphosphates and Dialkylphosphates; The Conversion of the Latter Species to Trialkylphosphates by Alkylating Esterification. Molecules 2022; 27:molecules27154674. [PMID: 35897850 PMCID: PMC9331942 DOI: 10.3390/molecules27154674] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/06/2022] [Revised: 07/19/2022] [Accepted: 07/20/2022] [Indexed: 12/04/2022] Open
Abstract
The microwave (MW)-assisted direct esterification of certain P-acids is a green method. Quantum chemical calculations revealed that the activation enthalpy (ΔH#) for the exothermic monoalkylphosphate → dialkylphosphate transformation was on the average 156.6 kJ mol−1, while ΔH# for the dialkylphosphate → trialkylphosphate conversion was somewhat higher, 171.2 kJ mol−1, and the energetics of the elemental steps of this esterification was less favorable. The direct monoesterification may be performed on MW irradiation in the presence of a suitable ionic liquid additive. However, the second step, with the less favorable energetics as a whole, could not be promoted by MWs. Hence, dialkylphosphates had to be converted to triesters by another method that was alkylation. In this way, it was also possible to synthesize triesters with different alkyl groups. Eventually a green, P-chloride free MW-promoted two-step method was elaborated for the synthesis of phosphate triesters.
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Affiliation(s)
- Péter Ábrányi-Balogh
- Medicinal Chemistry Research Group, Research Centre for Natural Sciences, 1117 Budapest, Hungary;
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary;
| | - Nikoletta Harsági
- Department of Organic Chemistry and Technology, 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, Budapest University of Technology and Economics, 1521 Budapest, Hungary;
- Correspondence: ; Tel.: +36-1-463-1111 (ext. 5883)
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18
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Varga PR, Dinnyési E, Tóth S, Szakács G, Keglevich G. Optimized Synthesis and Cytotoxic Activity of Aminophosphonates against a Multidrug Resistant Uterine Sarcoma Cell Line. LETT DRUG DES DISCOV 2022. [DOI: 10.2174/1570180819666220609104427] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
Aminophosphonates are potentially biologically active species.
Objective:
We wished to compare the synthetic methods, and evaluate the effect of the -aminophosphonates on sarcoma cell lines.
Methods:
We investigated microwave-assisted Kabachnik–Fields and Pudovik reactions, as well as substitutions, and applied in vitro cytotoxicity screening.
Results:
The Kabachnik–Fields condensation and the Pudovik reaction were found to be the most suitable regarding efficiency. Surprisingly, the multidrug resistant (MDR) uterine sarcoma (Mes-Sa/Dx5) cell line was the most susceptible to the aminophosphonates tested.
Conclusions:
Aminophosphonates may indeed display anticancer effect. Substituents in the para position of the phenyl ring have an impact on the activity: the 4-Me and 4-Cl derivatives were more toxic to all cell lines as compared to the 4-H and 4-MeO species.
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Affiliation(s)
- Petra Regina Varga
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
| | - Emőke Dinnyési
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
| | - Szilárd Tóth
- Institute of Enzymology, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Magyar Tudósok körútja 2, H-1117 Budapest, Hungary
| | - Gergely Szakács
- Institute of Enzymology, Research Centre for Natural Sciences, Eötvös Loránd Research Network, Magyar Tudósok körútja 2, H-1117 Budapest, Hungary
- Institute of Cancer Research, Medical University of Vienna, Borschkegasse 8a, A-1090 Vienna, Austria
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
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Keglevich G, Szalai Z, Gulyás KV, Zahár R, Grün A, Für CS. The synthesis of hydroxymethylenebisphosphonic- (dronic-) and acyl-ethoxycarbonyl-methylphosphonate derivatives. PHOSPHORUS SULFUR 2022. [DOI: 10.1080/10426507.2021.2011873] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Zsuzsanna Szalai
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Kinga V. Gulyás
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Róbert Zahár
- 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
| | - Csilla Sepsey Für
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
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Harsági N, Szőllősi B, Varga PR, Keglevich G. Hydrolysis and alcoholysis of phosphinates and phosphonates. PHOSPHORUS SULFUR 2022. [DOI: 10.1080/10426507.2021.1991345] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Nikoletta Harsági
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Betti Szőllősi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Petra Regina Varga
- 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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21
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Harsági N, Kiss NZ, Ábrányi-Balogh P, Keglevich G. Microwave-assisted esterification of P-acids. PHOSPHORUS SULFUR 2022. [DOI: 10.1080/10426507.2021.1990925] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Nikoletta Harsági
- 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
| | - Péter Ábrányi-Balogh
- Research Centre for Natural Sciences, Medicinal Chemistry Research Group, Budapest, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
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22
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Kiss NZ, Harsági N, Keglevich G. Ionic liquid-promoted synthesis of phosphinates and other derivatives. PHOSPHORUS SULFUR 2022. [DOI: 10.1080/10426507.2021.2011878] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Nóra Zsuzsa Kiss
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Nikoletta Harsági
- 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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23
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Keglevich G, Harsági N, Varga PR, Huszár B, Henyecz R, Kiss NZ, Mucsi Z, Bagi P. Newer developments in the green synthesis of tertiary phosphine oxides, phosphinates, phosphonates and their derivatives. PHOSPHORUS SULFUR 2022. [DOI: 10.1080/10426507.2021.1990924] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Nikoletta Harsági
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Petra R. Varga
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - 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
| | - Nóra Z. Kiss
- 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
| | - Péter Bagi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
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24
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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25
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Varga PR, Belovics A, Hägele G, Keglevich G. Synthesis of novel α-hydroxyphosphonates along with α-aminophosphonates as intermediates. PHOSPHORUS SULFUR 2022. [DOI: 10.1080/10426507.2021.2008927] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- Petra R. Varga
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Alexandra Belovics
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
| | - Gerhard Hägele
- Institute of Inorganic Chemistry and Structural Chemistry, Heinrich-Heine-University Düsseldorf, Düsseldorf, Germany
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Budapest, Hungary
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26
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Keglevich G, Harsági N, Kiss NZ. P-Chloride-Free Synthesis of Phosphoric Esters: Microwave-Assisted Esterification of Alkyl- and Dialkyl Phosphoric Ester-Acids Obtained from Phosphorus Pentoxide. SYNTHESIS-STUTTGART 2022. [DOI: 10.1055/a-1811-8586] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
AbstractIt is a reasonable endeavour to replace P-chloride starting materials (e.g., POCl3) with greener and cheaper reagents. Our purpose was to start from phosphorus pentoxide, i.e. to utilize its reaction with alcohols in the preparation of (HO)2P(O)(OR) and HOP(O)(OR)2, and to convert the mixtures of the corresponding monoester and diester, so obtained, into the target trialkyl esters. Separate experiments showed that the monobutylphosphate undergo microwave (MW)-assisted esterification with butanol in the presence of [bmim][BF4] catalyst at 200 °C to afford dibutylphosphate in a selective manner (ca. 95%) that, in turn, may be converted into tributylphosphate by alkylation under MW irradiation. In this way, the mixtures of (HO)2P(O)(OR) and HOP(O)(OR)2 obtained by the practical reaction of phosphorus pentoxide and alcohol (ROH) could also be converted in two additional steps into the corresponding trialkyl esters. The three-step synthesis of trialkylphosphates starting from phosphorus pentoxide was also transformed in a one-pot (step 1: preparation of the monoester diester mixture, step 2: diesterification) and telescoping (step 3: triesterification) variation, avoiding the isolation and purification of the intermediates, and affording the triesters in 86–93% yields. The three- and two-step P-chloride-free methods developed are ‘green’ and of more general value.
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Varga PR, Belovics A, Bagi P, Tóth S, Szakács G, Bősze S, Szabó R, Drahos L, Keglevich G. Efficient Synthesis of Acylated, Dialkyl α-Hydroxy-Benzylphosphonates and Their Anticancer Activity. Molecules 2022; 27:molecules27072067. [PMID: 35408466 PMCID: PMC9000670 DOI: 10.3390/molecules27072067] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Revised: 03/17/2022] [Accepted: 03/21/2022] [Indexed: 11/25/2022] Open
Abstract
An efficient method applying acyl chlorides as reagents was developed for the acylation of the hindered hydroxy group of dialkyl α-hydroxy-benzylphosphonates. The procedure did not require any catalyst. A few acylations were also performed with the SC-enantiomer of dimethyl α-hydroxy-benzylphosphonate, and the optical purity was retained. A part of the acyloxyphosphonates was tested against eight tumor cell lines of different tissue origin at c = 50 μM concentration. The compounds elicited moderate cytostatic effect against breast, skin, prostate, colon, and lung carcinomas; a melanoma cell line; and against Kaposi’s sarcoma cell lines. Then, dose-dependent cytotoxicity was assayed, and benzoylation of the α-hydroxy group was identified as a moiety that increases anticancer cytotoxicity across all cell lines. Surprisingly, a few analogues were more toxic to multidrug resistant cancer cell lines, thus evading P-glycoprotein mediated drug extrusion.
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Affiliation(s)
- Petra R. Varga
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary; (P.R.V.); (A.B.); (P.B.)
| | - Alexandra Belovics
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary; (P.R.V.); (A.B.); (P.B.)
| | - Péter Bagi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary; (P.R.V.); (A.B.); (P.B.)
| | - Szilárd Tóth
- Research Centre for Natural Sciences, Institute of Enzymology, 1117 Budapest, Hungary; (S.T.); (G.S.)
| | - Gergely Szakács
- Research Centre for Natural Sciences, Institute of Enzymology, 1117 Budapest, Hungary; (S.T.); (G.S.)
- Institute of Cancer Research, Medical University of Vienna, Borschkegasse 8a, A-1090 Vienna, Austria
| | - Szilvia Bősze
- Eötvös Loránd Research Network (ELKH), Research Group of Peptide Chemistry, Eötvös Loránd University, 1117 Budapest, Hungary; (S.B.); (R.S.)
| | - Rita Szabó
- Eötvös Loránd Research Network (ELKH), Research Group of Peptide Chemistry, Eötvös Loránd University, 1117 Budapest, Hungary; (S.B.); (R.S.)
| | - László Drahos
- Research Centre for Natural Sciences, MS Proteomics Research Group, 1117 Budapest, Hungary;
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary; (P.R.V.); (A.B.); (P.B.)
- Correspondence: ; Tel.: +36-1-463-1111 (ext. 5883)
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29
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Varga B, Vincze D, Pető H, Buna L, Pauló J, Holczbauer T, Mátravölgyi B, Hegedűs L, Fogassy E, Keglevich G, Bagi P. Resolution of aryl- H-phosphinates applied in the synthesis of P-stereogenic compounds including a Brønsted acid NMR solvating agent. Org Chem Front 2022. [DOI: 10.1039/d2qo00241h] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
An enantioseparation method for the preparation of P-stereogenic H-phosphinates was elaborated. In stereoselective reactions, various chiral P-stereogenic compounds were prepared and their applications as chiral NMR solvating agents were assessed.
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Affiliation(s)
- Bence Varga
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Daniella Vincze
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Hajnalka Pető
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Levente Buna
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - János Pauló
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Tamás Holczbauer
- Center for Structural Science, Chemical Crystallography Research Laboratory and Institute for Organic Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1519 Budapest, Hungary
| | - Béla Mátravölgyi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - László Hegedűs
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Elemér Fogassy
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
| | - Péter Bagi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3., H-1111 Budapest, Hungary
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30
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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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31
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Keglevich G. The Potential of Microwaves in Organophosphorus Syntheses. CURR ORG CHEM 2021. [DOI: 10.2174/1385272825666211102103523] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
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Ábrányi-Balogh P, Greiner I, Keglevich G. A Mechanistic Study on the Formation of Dronic Acids. Molecules 2021; 26:molecules26247587. [PMID: 34946669 PMCID: PMC8708247 DOI: 10.3390/molecules26247587] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 12/09/2021] [Accepted: 12/09/2021] [Indexed: 11/20/2022] Open
Abstract
Dronic acid derivatives, important drugs against bone diseases, may be synthesized from the corresponding substituted acetic acid either by reaction with phosphorus trichloride in methanesulfonic acid as the solvent or by using also phosphorous acid as the P-reactant if sulfolane is applied as the medium. The energetics of the two protocols were evaluated by high-level quantum chemical calculations on the formation of fenidronic acid and benzidronic acid. The second option, involving (HO)2P-O-PCl2 as the nucleophile, was found to be more favorable over the first variation, comprising Cl2P-O-SO2Me as the real reagent, especially for the case of benzidronate.
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Affiliation(s)
- Péter Ábrányi-Balogh
- Research Centre for Natural Sciences, Medicinal Chemistry Research Group, 1117 Budapest, Hungary
- Correspondence: (P.Á.-B.); (G.K.); Tel.: +36-1-463-1111 (ext. 5883) (G.K.)
| | | | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
- Correspondence: (P.Á.-B.); (G.K.); Tel.: +36-1-463-1111 (ext. 5883) (G.K.)
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33
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Keglevich G. Trends and Possibilities to Turn Industrial Organic Chemistry Greener. CGC 2021. [DOI: 10.2174/2213346108666211021161235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest,
Hungary
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34
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Varga B, Szemesi P, Nagy P, Herbay R, Holczbauer T, Fogassy E, Keglevich G, Bagi P. Enantioseparation of P-Stereogenic Secondary Phosphine Oxides and Their Stereospecific Transformation to Various Tertiary Phosphine Oxides and a Thiophosphinate. J Org Chem 2021; 86:14493-14507. [PMID: 34633814 PMCID: PMC8576816 DOI: 10.1021/acs.joc.1c01364] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
![]()
Secondary phosphine
oxides incorporating various aryl and alkyl
groups were synthesized in racemic form, and these products formed
the library reported in this study. TADDOL derivatives were used to
obtain the optical resolution of these P-stereogenic
secondary phosphine oxides. The developed resolution method showed
a good scope under the optimized reaction conditions, as 9 out of
14 derivatives could be prepared with an enantiomeric excess (ee)
≥ 79% and 5 of these derivatives were practically enantiopure
>P(O)H compounds (ee ≥ 98%). The scalability of this resolution
method was also demonstrated. Noncovalent interactions responsible
for the formation of diasteromeric complexes were elucidated by single-crystal
XRD measurements. (S)-(2-Methylphenyl)phenylphosphine
oxide was transformed to a variety of P-stereogenic
tertiary phosphine oxides and a thiophosphinate in stereospecific
Michaelis–Becker, Hirao, or Pudovik reactions.
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Affiliation(s)
- Bence Varga
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
| | - Péter Szemesi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary.,Gedeon Richter Plc., H-1475 Budapest, Hungary
| | - Petra Nagy
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
| | - Réka Herbay
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
| | - Tamás Holczbauer
- Center for Structural Science, Chemical Crystallography Research Laboratory and Institute for Organic Chemistry, Research Centre for Natural Sciences, Magyar tudósok körútja 2, H-1519 Budapest, Hungary
| | - Elemér Fogassy
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
| | - Péter Bagi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Műegyetem rkp. 3, H-1111 Budapest, Hungary
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35
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Henyecz R, Keglevich G. Synthesis of Phosphonates, Phosphinates and Tertiary Phosphine Oxides by Pd- or Ni-Catalyzed Microwave-Assisted P–C Coupling Reactions without the Addition of Conventional Ligands. CURR ORG CHEM 2021. [DOI: 10.2174/1385272825999210101234850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Microwave (MW)-assistance may be a powerful tool in the Hirao P–C coupling
reactions of vinyl/aryl halides with dialkyl phosphites in the presence of Pd-catalysts/Pligands
elaborated forty years ago. This review surveys the development of this reaction by
showing the expansion of the reagents and catalysts, as well as the information accumulated.
The stress was laid on the “green” aspects, the simplification of the catalyst systems, and the
reliable mechanistic details in order to be able to establish the optimum conditions. The best
protocol involves the use of some excess of the >P(O)H reagent to ensure the PdII→Pd0 reduction
and, via its trivalent tautomeric form (>POH), also the P-ligand. The overall rate is
the result of two factors, the activity of the catalyst complex formed, and the reactivity of the
reactants in the P–C coupling reactions. The nature of the aryl substituents in Ar2P(O)H influences both components.
NiII salts may also be used as the catalyst precursor, however, despite the PdII→Pd0→PdII route, in this case, a
NiII→NiIV→NiII sequence was proved.
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Affiliation(s)
- Réka Henyecz
- 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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36
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Harsági N, Henyecz R, Ábrányi-Balogh P, Drahos L, Keglevich G. Microwave-Assisted Ionic Liquid-Catalyzed Selective Monoesterification of Alkylphosphonic Acids-An Experimental and a Theoretical Study. Molecules 2021; 26:5303. [PMID: 34500735 PMCID: PMC8434145 DOI: 10.3390/molecules26175303] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2021] [Revised: 08/16/2021] [Accepted: 08/25/2021] [Indexed: 11/16/2022] Open
Abstract
It is well-known that the P-acids including phosphonic acids resist undergoing direct esterification. However, it was found that a series of alkylphoshonic acids could be involved in monoesterification with C2-C4 alcohols under microwave (MW) irradiation in the presence of [bmim][BF4] as an additive. The selectivity amounted to 80-98%, while the isolated yields fell in the range of 61-79%. The method developed is a green method for P-acid esterification. DFT calculations at the M062X/6-311+G (d,p) level of theory (performed considering the solvent effect of the corresponding alcohol) explored the three-step mechanism, and justified a higher enthalpy of activation (160.6-194.1 kJ·mol-1) that may be overcome only by MW irradiation. The major role of the [bmim][BF4] additive is to increase the absorption of MW energy. The specific chemical role of the [BF4] anion of the ionic liquid in an alternative mechanism was also raised by the computations.
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Affiliation(s)
- Nikoletta Harsági
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary; (N.H.); (R.H.)
| | - Réka Henyecz
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary; (N.H.); (R.H.)
| | - Péter Ábrányi-Balogh
- Medicinal Chemistry Research Group, Research Centre for Natural Sciences, 1117 Budapest, Hungary;
| | - László Drahos
- MS Proteomics Research Group, Research Centre for Natural Sciences, 1117 Budapest, Hungary;
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary; (N.H.); (R.H.)
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37
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Holczbauer T, Varga B, Herbay R, Székely G, Madarász J, Mátravölgyi B, Fogassy E, Keglevich G, Bagi P. Resolving P-stereogenic enantiomers at nonambient conditions. Acta Crystallogr A Found Adv 2021. [DOI: 10.1107/s0108767321086815] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022] Open
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38
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Harsági N, Keglevich G. The Hydrolysis of Phosphinates and Phosphonates: A Review. Molecules 2021; 26:molecules26102840. [PMID: 34064764 PMCID: PMC8150351 DOI: 10.3390/molecules26102840] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2021] [Revised: 05/04/2021] [Accepted: 05/06/2021] [Indexed: 11/21/2022] Open
Abstract
Phosphinic and phosphonic acids are useful intermediates and biologically active compounds which may be prepared from their esters, phosphinates and phosphonates, respectively, by hydrolysis or dealkylation. The hydrolysis may take place both under acidic and basic conditions, but the C-O bond may also be cleaved by trimethylsilyl halides. The hydrolysis of P-esters is a challenging task because, in most cases, the optimized reaction conditions have not yet been explored. Despite the importance of the hydrolysis of P-esters, this field has not yet been fully surveyed. In order to fill this gap, examples of acidic and alkaline hydrolysis, as well as the dealkylation of phosphinates and phosphonates, are summarized in this review.
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39
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Für CS, Horváth EJ, Szigetvári Á, Dékány M, Hazai L, Keglevich G, Bölcskei H. Synthesis of Spiro[cycloalkane-pyridazinones] with High Fsp3 Character Part 2*. LETT ORG CHEM 2021. [DOI: 10.2174/1570178617999200728214211] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Abstract:
An extended compound library of spiro[cycloalkane-pyridazinones] with a high Fsp3 character
is targeted. There are two possibilities to improve the physicochemical parameters of a drug candidate
molecules or building blocks, either to replace the aromatic systems with bioisoster heteroaromatic
moieties, e.g. with one or two nitrogen containing ring systems (pyridines, pyridazines, pyrimidines,
etc.), or to increase the Fsp3 character of the compounds. Using a new synthetic approach,
the Grignard reaction of 2-oxaspiro[4.5]decane-1,3-dione and 2-oxaspiro[4.4]nonane-1,3-dione with
p-halophenyl- or p-alkylphenyl-magnesium bromide resulted in the formation of the corresponding
2-oxoethyl-cycloalkanecarboxylic acids, which served as starting materials for the pyridazinones by
reaction with hydrazine or phenylhydrazine. The pyridazinones obtained were alkylated with methyliodide
or benzylbromide. 16 Novel 4-tolyl- or 4-halophenyl-2,3-diazaspiro[5.5]undec-3-en-1-one and
4-tolyl- or 4-halopyhenyl-7,8-diazaspiro[4.5]dec-8-en-6-one, and their N-methyl, N-benzyl, and
N-phenyl derivatives were synthetized. The physicochemical parameters and the Fsp3 character of the
novel compounds obtained were studied. A few of them showed excellent logP and clogP values, but
the introduction of a further phenyl group seemed to be disadvantageous.
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Affiliation(s)
- Csilla Sepsey Für
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest,Hungary
| | - Eszter Judit Horváth
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest,Hungary
| | - Áron Szigetvári
- Gedeon Richter Plc. Budapest X., Gyömrői út 19-21, Budapest 10. Pf.27. H-1475,Hungary
| | - Miklós Dékány
- Gedeon Richter Plc. Budapest X., Gyömrői út 19-21, Budapest 10. Pf.27. H-1475,Hungary
| | - László Hazai
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest,Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest,Hungary
| | - Hedvig Bölcskei
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest,Hungary
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40
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Varga PR, Keglevich G. Synthesis of α-Aminophosphonates and Related Derivatives; the Last Decade of the Kabachnik-Fields Reaction. Molecules 2021; 26:2511. [PMID: 33923090 PMCID: PMC8123346 DOI: 10.3390/molecules26092511] [Citation(s) in RCA: 19] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2021] [Revised: 04/07/2021] [Accepted: 04/17/2021] [Indexed: 11/21/2022] Open
Abstract
The Kabachnik-Fields reaction, comprising the condensation of an amine, oxo compound and a P-reagent (generally a >P(O)H species or trialkyl phosphite), still attracts interest due to the challenging synthetic procedures and the potential biological activity of the resulting α-aminophosphonic derivatives. Following the success of the first part (Molecules 2012, 17, 12821), here we summarize the synthetic developments in this field accumulated in the last decade. The procedures compiled include catalytic accomplishments as well as catalyst-free and/or solvent-free "greener" protocols. The products embrace α-aminophosphonates, α-aminophosphinates, and α-aminophosphine oxides along with different bis derivatives from the double phospha-Mannich approach. The newer developments of the aza-Pudovik reactions are also included.
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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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41
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Harsági N, Bertha C, Kiss NZ, Henyecz R, Varga PR, Ábrányi-Balogh P, Drahos L, Keglevich G. Alcoholysis Versus Fission of the Ester Group During the Reaction of Dialkyl Phenylphosphonates in the Presence of Ionic Liquids. CURR ORG CHEM 2021. [DOI: 10.2174/1385272825666210212115649] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In the microwave-assisted alcoholysis of dialkyl phenylphosphonates performed in the presence of suitable ionic liquids, such as [bmim][BF4] or [bmim][PF6], affording the phosphonate with mixed alkoxy groups and the fully transesterified product, the fission of the phosphonate function to the ester-acid or diacid moiety was inevitable. Moreover, in the presence of [emim][HSO4], the reaction could be performed to afford the phosphonic esteracid with a selectivity of 66% and the diacid with a selectivity of 97%. The ester-acids provided by the new protocol may be valuable intermediates.
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Affiliation(s)
- Nikoletta Harsági
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - Csilla Bertha
- 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
| | - Petra Regina Varga
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
| | - Péter Ábrányi-Balogh
- Research Centre for Natural Sciences, Medicinal Chemistry Research Group, 1117 Budapest, Hungary
| | - László Drahos
- Research Centre for Natural Sciences, MS Proteomics Research Group, 1117 Budapest, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest, Hungary
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42
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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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43
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Affiliation(s)
- György Keglevich
- Department of Organic Chemical Technology Budapest University of Technology and Economics, Hungary
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44
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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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45
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Grün A, Szalai Z, Keglevich G. “Greener” Synthesis of Zoledronic Acid from Imidazol-1-yl-acetic Acid and P-Reagents Using Diethyl Carbonate as the Solvent Component. LETT ORG CHEM 2021. [DOI: 10.2174/1570178617999200730203738] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
The synthesis of a third generation dronic acid, zoledronic acid by the reaction of imidazol-
1-yl-acetic acid with phosphorus trichloride/phosphorous acid in diethyl carbonate (DEC) as a “green”
solvent, and in DEC – methanesulfonic acid (MSA) solvent mixtures is described. The earlier not
“green” and expensive MSA and sulfolane solvents may be replaced by DEC.
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Affiliation(s)
- Alajos Grün
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, 1521 Budapest,Hungary
| | - Zsuzsanna Szalai
- 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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46
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Affiliation(s)
- György Keglevich
- Budapest University of Technology and Economics, Budapest, Hungary
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47
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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] [What about the content of this article? (0)] [Affiliation(s)] [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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Für CS, Riszter G, Gerencsér J, Szigetvári Á, Dékány M, Hazai L, Keglevich G, Bölcskei H. Synthesis of Spiro[cycloalkane-pyridazinones] with High Fsp3 Character. LETT DRUG DES DISCOV 2020. [DOI: 10.2174/1570180816666190710130119] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Background:
owadays, in course of the drug design and discovery much attention is
paid to the physicochemical parameters of a drug candidate, in addition to their biological activity.
Disadvantageous physicochemical parameters can hinder the success of a drug candidate.
Objective:
Lovering et al. introduced the Fsp3 character as a measure of carbon bond saturation,
which is related to the physicochemical paramethers of the drug. The pharmaceutical research focuses
on the synthesis of compounds with high Fsp3 character.
Methods:
To improve the physicochemical properties (clogP, solubility, more advantageous ADME
profile, etc.) of drug-candidate molecules one possibility is the replacement of all-carbon aromatic
systems with bioisoster heteroaromatic moieties, e.g. with one or two nitrogen atom containing systems,
such as pyridines and pyridazines, etc. The other option is to increase the Fsp3 character of the
drug candidates. Both of these aspects were considered in the design the new spiro[cycloalkanepyridazinones],
the synthesis of which is described in the present study.
Results:
Starting from 2-oxaspiro[4.5]decane-1,3-dione or 2-oxaspiro[4.4]nonane-1,3-dione, the
corresponding ketocarboxylic acids were obtained by Friedel-Crafts reaction with anisole or veratrole.
The ketocarboxylic acids were treated by hydrazine, methylhydrazine or phenylhydrazine to form
the pyridazinone ring. N-Alkylation reaction of the pyridazinones resulted in the formation of further
derivatives with high Fsp3 character.
Conclusion:
A small compound library was obtained incorporating compounds with high Fsp3 characters,
which predicts advantageous physico-chemical parameters (LogP, ClogP and TPSA) for potential
applications in medicinal chemistry.
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Affiliation(s)
- Csilla Sepsey Für
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
| | - Gergő Riszter
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
| | - János Gerencsér
- BioBlocks Hungary, Ltd. Budapest1045 Budapest, Berlini ut 47-49, Hungary
| | - Áron Szigetvári
- Gedeon Richter Plc. Budapest X., Gyomroi ut 19-21, Budapest 10. Pf.27. H-1475, Hungary
| | - Miklós Dékány
- Gedeon Richter Plc. Budapest X., Gyömrői út 19-21., Budapest 10. Pf.27. H-1475, Hungary
| | - László Hazai
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
| | - Hedvig Bölcskei
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1521 Budapest, Hungary
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Abstract
:
Many catalysts were tested in asymmetric Michael additions in order to synthesize
enantioenriched products. One of the most common reaction types among the Michael
reactions is the conjugated addition of malonates to enones making it possible to investigate
the structure–activity relationship of the catalysts. The most commonly used Michael
acceptors are chalcone, substituted chalcones, chalcone derivatives, cyclic enones,
while typical donors may be dimethyl, diethyl, dipropyl, diisopropyl, dibutyl, di-tert-butyl
and dibenzyl malonates. This review summarizes the most important enantioselective
catalysts applied in these types of reactions.
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Affiliation(s)
- Péter Bakó
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, PO Box 91, 1521 Budapest, Hungary
| | - Tamás Nemcsok
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, PO Box 91, 1521 Budapest, Hungary
| | - Zsolt Rapi
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, PO Box 91, 1521 Budapest, Hungary
| | - György Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, PO Box 91, 1521 Budapest, Hungary
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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] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
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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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