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Szántay C, Weber M, Szigetvári Á, Halmai M, Keglevich P. On the role of „mental leaps” in small-molecule structure elucidation by NMR spectroscopy. ARKIVOC 2022. [DOI: 10.24820/ark.5550190.p011.884] [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: 11/29/2022] Open
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2
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Szeleczky Z, Szakács Z, Bozó É, Baska F, Vukics K, Lévai S, Temesvári K, Vass E, Béni Z, Krámos B, Magdó I, Szántay C, Kóti J, Domány-Kovács K, Greiner I, Bata I. Synthesis and Characterization of New V 1A Antagonist Compounds: The Separation of Four Atropisomeric Stereoisomers. J Med Chem 2021; 64:10445-10468. [PMID: 34255509 DOI: 10.1021/acs.jmedchem.1c00863] [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] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
A new class of selective vasopressin receptor 1A (V1A) antagonists was identified, where "methyl-scan" was performed around the benzene ring of the 5-hydroxy-triazolobenzazepine core. This led to the synthesis of two 10-methyl derivatives, each possessing a chiral axis and a stereogenic center. The four atropisomeric stereoisomers (involving two enantiomer pairs and atropisomeric diastereomers) could be successfully isolated and spectroscopically characterized. According to the in vitro pharmacological profiles of the compounds, the human V1A receptor has a strong preference toward the isomers having an aR axial chirality, the most active isomer being the aR,5S isomer. Furthermore, the structure-activity relationships obtained for the isomers and for the newly synthesized analogues could be tentatively explained by an in silico study.
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Affiliation(s)
- Zsolt Szeleczky
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - Zoltán Szakács
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - Éva Bozó
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - Ferenc Baska
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | | | - Sándor Lévai
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | | | - Elemér Vass
- Institute of Chemistry, Eötvös Loránd University, Pázmány Péter sétány 1/A, Budapest H-1117, Hungary
| | - Zoltán Béni
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - Balázs Krámos
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - Ildikó Magdó
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - Csaba Szántay
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - János Kóti
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | | | - István Greiner
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
| | - Imre Bata
- Gedeon Richter Plc., 19-21 Gyömrői út, Budapest 1103, Hungary
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3
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Szigetvári Á, Szántay C. On the utility of nonuniformly sampled two-dimensional NMR spectra in the pharmaceutical industry. Magn Reson Chem 2021; 59:264-286. [PMID: 32754953 DOI: 10.1002/mrc.5085] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2020] [Revised: 07/14/2020] [Accepted: 08/02/2020] [Indexed: 06/11/2023]
Abstract
In this work, we discuss representative examples of the application of nonuniform sampling (NUS) in small-molecule structure determination in a pharmaceutical research and development and quality control setting. We demonstrate the advantages of NUS over traditional sampling in various industrial applications of nuclear magnetic resonance (NMR). We propose an optimal trade-off between the quality and the time efficiency of 'routine' measurements, as demonstrated via a test sample of vinpocetine analyzed on a 'work horse' NMR spectrometer. In addition, we present case studies where the application of NUS contributed significantly to the successful completion of some challenging structure determination task at hand. To that end, in some cases, we combined NUS with a method of decoupling in the indirect dimension that gives 'constant time' nuclear Overhauser effect spectroscopy (NOESY) and 'constant time' heteronuclear multiple bond correlation (HMBC) spectra. NUS proved to be superior over traditional sampling even for the analysis of trace impurities, where the need to cope with a thousand-fold or even larger dynamic range and low signal-to-noise ratio for the impurity signals is quite a challenge.
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Affiliation(s)
- Áron Szigetvári
- Spectroscopic Research Department, Gedeon Richter Plc., Budapest, Hungary
| | - Csaba Szántay
- Spectroscopic Research Department, Gedeon Richter Plc., Budapest, Hungary
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4
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Nagy S, Szigetvári Á, Ilkei V, Krámos B, Béni Z, Szántay C, Hazai L. Synthesis of aminal-type Lilium candidum alkaloids and lilaline; determination of their relative configuration by the concerted use of NMR spectroscopy and DFT conformational analysis. Tetrahedron 2021. [DOI: 10.1016/j.tet.2020.131827] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
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5
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Mayer S, Keglevich P, Ábrányi-Balogh P, Szigetvári Á, Dékány M, Szántay C, Hazai L. Synthesis and In Vitro Anticancer Evaluation of Novel Chrysin and 7-Aminochrysin Derivatives. Molecules 2020; 25:molecules25040888. [PMID: 32079315 PMCID: PMC7070641 DOI: 10.3390/molecules25040888] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [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: 01/27/2020] [Revised: 02/13/2020] [Accepted: 02/13/2020] [Indexed: 01/24/2023] Open
Abstract
Chrysin is a naturally occurring flavonoid with mild anticancer activity. In this paper we report the synthesis of new chrysin derivatives alkylated with N-phenylchloroacetamides in position 7. A novel method was developed for the preparation of 7-aminochrysin derivatives via the Smiles rearrangement, resulting in diphenylamine-type compounds. In silico studies of the Smiles rearrangement were performed. We also present the in vitro antiproliferative activity of the synthesized compounds against 60 human tumor cell lines (NCI60). The most potent derivative exhibited nanomolar antitumor activity on the MCF7 cell line of breast cancer (GI50 = 30 nM) and on the HCT-15 cell line of colon cancer (GI50 = 60 nM).
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Affiliation(s)
- Szabolcs Mayer
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Gellért tér 4, H-1111 Budapest, Hungary; (S.M.); (L.H.)
| | - Péter Keglevich
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Gellért tér 4, H-1111 Budapest, Hungary; (S.M.); (L.H.)
- Correspondence: (P.K.); (P.Á.-B.)
| | - Péter Ábrányi-Balogh
- Medicinal Chemistry Research Group, Institute of Organic Chemistry, Research Centre for Natural Sciences, Magyar tudósok krt. 2, H-1117 Budapest, Hungary
- Correspondence: (P.K.); (P.Á.-B.)
| | - Áron Szigetvári
- Spectroscopic Research Department, Gedeon Richter Plc., P.O. Box 27, H-1475 Budapest, Hungary; (Á.S.); (M.D.)
| | - Miklós Dékány
- Spectroscopic Research Department, Gedeon Richter Plc., P.O. Box 27, H-1475 Budapest, Hungary; (Á.S.); (M.D.)
| | - Csaba Szántay
- Spectroscopic Research Department, Gedeon Richter Plc., P.O. Box 27, H-1475 Budapest, Hungary; (Á.S.); (M.D.)
| | - László Hazai
- Department of Organic Chemistry and Technology, Faculty of Chemical Technology and Biotechnology, Budapest University of Technology and Economics, Gellért tér 4, H-1111 Budapest, Hungary; (S.M.); (L.H.)
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6
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Szabó-Szentjóbi H, Márton A, Pál D, Dargó G, Szigetvári Á, Szántay C, Balogh GT, Tóth T, Huszthy P. Synthesis, Fluorescence and NMR Spectroscopic Studies of a Novel Phosphinoxido-18-crown-6 Ether Containing an Anthracene Fluorophore Unit. Period Polytech Chem Eng 2019. [DOI: 10.3311/ppch.14646] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/04/2022]
Abstract
The synthesis of the (R,R) and (S,S) enantiomers of a new enantiopure monophospha-18-crown-6 ether (1), which contains an anthracene fluorophore unit and methyl groups at its stereogenic centers, was accomplished. The structure of one enantiomer ((S,S)-1) was studied using one-dimensional (1H, 13C{1H}, and 31P{1H}) and two-dimensional NMR spectra. Because (R,R)-1 and (S,S)-1 can act as new fluorescent chemosensors, we examined their enantiomeric differentiation abilities toward the enantiomers of protonated chiral primary amines and amino acid esters (PEA, 1-NEA, PGME, PAME) using UV-Vis and fluorescence spectroscopies. These monophospha-crown ethers showed moderate enantiomeric discrimination abilities.
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8
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Keglevich A, Zsiros V, Keglevich P, Szigetvári Á, Dékány M, Szántay C, Mernyák E, Wölfling J, Hazai L. Synthesis and In Vitro Antitumor Effect of New Vindoline-steroid Hybrids. CURR ORG CHEM 2019. [DOI: 10.2174/1385272823666190614113218] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
10-Aminovindoline and 17-desacetylvindoline were coupled with 5α-
dihydrotestosterone hemisuccinate and 19-nortestosterone hemisuccinate. As a result,
four vindoline-steroid hybrids were synthesized via a succinate linker. One of the new
hybrid compounds showed significant anticancer effect in vitro in the case of colon cancer
and melanoma cell lines.
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Affiliation(s)
- András Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1111 Budapest, Gellert ter 4, Hungary
| | - Vivian Zsiros
- Quality Process Development Department, Egis Pharmaceuticals Plc., H-1106 Budapest, Kereszturi ut 30-38, Hungary
| | - Péter Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1111 Budapest, Gellert ter 4, Hungary
| | - Áron Szigetvári
- Spectroscopic Research Department, Gedeon Richter Plc., H-1475 Budapest, 10, P. O. Box 27, Hungary
| | - Miklós Dékány
- Spectroscopic Research Department, Gedeon Richter Plc., H-1475 Budapest, 10, P. O. Box 27, Hungary
| | - Csaba Szántay
- Spectroscopic Research Department, Gedeon Richter Plc., H-1475 Budapest, 10, P. O. Box 27, Hungary
| | - Erzsébet Mernyák
- Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Dom ter 8, Hungary
| | - János Wölfling
- Department of Organic Chemistry, University of Szeged, H-6720 Szeged, Dom ter 8, Hungary
| | - László Hazai
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1111 Budapest, Gellert ter 4, Hungary
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9
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Keglevich A, Szigetvári Á, Dékány M, Szántay C, Keglevich P, Hazai L. Synthesis and in vitro Antitumor Effect of New Vindoline Derivatives Coupled with Triphenylphosphine. CURR ORG CHEM 2019. [DOI: 10.2174/1385272823666190524083236] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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
An important approach to the development of new antitumor agents is the synthesis of conjugates containing two or more structural units. Taking this into consideration, vindoline derivatives were coupled with triphenylphosphine, to afford the expected phosphonium salts. The new hybrid entities were characterized by NMR spectroscopy, and their anticancer activity was also evaluated.
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Affiliation(s)
- András Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1111 Budapest, Gellert ter 4, Hungary
| | - Áron Szigetvári
- Spectroscopic Research Department, Gedeon Richter Plc., H-1475 Budapest, 10, P. O. Box 27, Hungary
| | - Miklós Dékány
- Spectroscopic Research Department, Gedeon Richter Plc., H-1475 Budapest, 10, P. O. Box 27, Hungary
| | - Csaba Szántay
- Spectroscopic Research Department, Gedeon Richter Plc., H-1475 Budapest, 10, P. O. Box 27, Hungary
| | - Péter Keglevich
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1111 Budapest, Gellert ter 4, Hungary
| | - László Hazai
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, H-1111 Budapest, Gellert ter 4, Hungary
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10
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Keglevich A, Mayer S, Pápai R, Szigetvári Á, Sánta Z, Dékány M, Szántay C, Keglevich P, Hazai L. Attempted Synthesis of Vinca Alkaloids Condensed with Three-Membered Rings. Molecules 2018; 23:molecules23102574. [PMID: 30304796 PMCID: PMC6222653 DOI: 10.3390/molecules23102574] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [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: 08/30/2018] [Revised: 09/17/2018] [Accepted: 10/02/2018] [Indexed: 11/16/2022] Open
Abstract
Our successful work for the synthesis of cyclopropanated vinblastine and its derivatives by the Simmons⁻Smith reaction was followed to build up further three-membered rings into the 14,15-position of the vindoline part of the dimer alkaloid. Halogenated 14,15-cyclopropanovindoline was prepared by reactions with iodoform and bromoform, respectively, in the presence of diethylzinc. Reactions of dichlorocarbene with vindoline resulted in the 10-formyl derivative. Unexpectedly, in the case of the dimer alkaloids vinblastine and vincristine, the rearranged products containing an oxirane ring in the catharanthine part were isolated from the reactions. The attempted epoxidation of vindoline and catharanthine also led to anomalous rearranged products. In the epoxidation reaction of vindoline, an o-quinonoid derivative was obtained, in the course of the epoxidation of catharanthine, a hydroxyindolenine type product and a spiro derivative formed by ring contraction reaction, were isolated. The coupling reaction of vindoline and the spiro derivative obtained in the epoxidation of catharanthine did not result in a bisindole alkaloid. Instead, two surprising vindoline trimers were discovered and characterized by NMR spectroscopy and mass spectrometry.
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Affiliation(s)
- András Keglevich
- Department of Organic Chemistry and Technology, University of Technology and Economics, Budapest, Hungary, H-1111 Budapest, Gellért tér 4., Hungary.
| | - Szabolcs Mayer
- Department of Organic Chemistry and Technology, University of Technology and Economics, Budapest, Hungary, H-1111 Budapest, Gellért tér 4., Hungary.
| | - Réka Pápai
- ComInnex, Inc., Graphisoft Park (Building D), H-1031 Budapest, Záhony u. 7., Hungary.
| | - Áron Szigetvári
- Spectroscopic Research Department, Gedeon Richter Plc., H-1475 Budapest 10, P. O. Box 27, Hungary.
| | - Zsuzsanna Sánta
- Spectroscopic Research Department, Gedeon Richter Plc., H-1475 Budapest 10, P. O. Box 27, Hungary.
| | - Miklós Dékány
- Spectroscopic Research Department, Gedeon Richter Plc., H-1475 Budapest 10, P. O. Box 27, Hungary.
| | - Csaba Szántay
- Spectroscopic Research Department, Gedeon Richter Plc., H-1475 Budapest 10, P. O. Box 27, Hungary.
| | - Péter Keglevich
- Department of Organic Chemistry and Technology, University of Technology and Economics, Budapest, Hungary, H-1111 Budapest, Gellért tér 4., Hungary.
| | - László Hazai
- Department of Organic Chemistry and Technology, University of Technology and Economics, Budapest, Hungary, H-1111 Budapest, Gellért tér 4., Hungary.
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Háda V, Bagdi A, Bihari Z, Timári SB, Fizil Á, Szántay C. Recent advancements, challenges, and practical considerations in the mass spectrometry-based analytics of protein biotherapeutics: A viewpoint from the biosimilar industry. J Pharm Biomed Anal 2018; 161:214-238. [PMID: 30205300 DOI: 10.1016/j.jpba.2018.08.024] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/07/2018] [Revised: 08/08/2018] [Accepted: 08/10/2018] [Indexed: 01/22/2023]
Abstract
The extensive analytical characterization of protein biotherapeutics, especially of biosimilars, is a critical part of the product development and registration. High-resolution mass spectrometry became the primary analytical tool used for the structural characterization of biotherapeutics. Its high instrumental sensitivity and methodological versatility made it possible to use this technique to characterize both the primary and higher-order structure of these proteins. However, even by using high-end instrumentation, analysts face several challenges with regard to how to cope with industrial and regulatory requirements, that is, how to obtain accurate and reliable analytical data in a time- and cost-efficient way. New sample preparation approaches, measurement techniques and data evaluation strategies are available to meet those requirements. The practical considerations of these methods are discussed in the present review article focusing on hot topics, such as reliable and efficient sequencing strategies, minimization of artefact formation during sample preparation, quantitative peptide mapping, the potential of multi-attribute methodology, the increasing role of mass spectrometry in higher-order structure characterization and the challenges of MS-based identification of host cell proteins. On the basis of the opportunities in new instrumental techniques, methodological advancements and software-driven data evaluation approaches, for the future one can envision an even wider application area for mass spectrometry in the biopharmaceutical industry.
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Affiliation(s)
- Viktor Háda
- Analytical Department of Biotechnology, Gedeon Richter Plc, Hungary.
| | - Attila Bagdi
- Analytical Department of Biotechnology, Gedeon Richter Plc, Hungary
| | - Zsolt Bihari
- Analytical Department of Biotechnology, Gedeon Richter Plc, Hungary
| | | | - Ádám Fizil
- Analytical Department of Biotechnology, Gedeon Richter Plc, Hungary
| | - Csaba Szántay
- Spectroscopic Research Department, Gedeon Richter Plc, Hungary.
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12
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Bánóczi Z, Keglevich A, Szabó I, Ranđelović I, Hegedüs Z, Regenbach FL, Keglevich P, Lengyel Z, Gorka-Kereskényi Á, Dubrovay Z, Háda V, Szigetvári Á, Szántay C, Hazai L, Tóvári J, Hudecz F. The effect of conjugation on antitumor activity of vindoline derivatives with octaarginine, a cell-penetrating peptide. J Pept Sci 2018; 24:e3118. [PMID: 30084214 DOI: 10.1002/psc.3118] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [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: 05/09/2018] [Revised: 07/05/2018] [Accepted: 07/06/2018] [Indexed: 12/19/2022]
Abstract
Some Vinca alkaloids (eg, vinblastine, vincristine) have been widely used as antitumor drugs for a long time. Unfortunately, vindoline, a main alkaloid component of Catharanthus roseus (L.) G. Don, itself, has no antitumor activity. In our novel research program, we have prepared and identified new vindoline derivatives with moderate cytostatic activity. Here, we describe the effect of conjugation of vindoline derivative with oligoarginine (tetra-, hexa-, or octapeptides) cell-penetrating peptides on the cytostatic activity in vitro and in vivo. Br-Vindoline-(l)-Trp-OH attached to the N-terminus of octaarginine was the most effective compound in vitro on HL-60 cell line. Analysis of the in vitro activity of two isomer conjugates (Br-vindoline-(l)-Trp-Arg8 and Br-vindoline-(d)-Trp-Arg8 suggests the covalent attachment of the vindoline derivatives to octaarginine increased the antitumor activity significantly against P388 and C26 tumour cells in vitro. The cytostatic effect was dependent on the presence and configuration of Trp in the conjugate as well as on the cell line studied. The configuration of Trp notably influenced the activity on C26 and P388 cells: conjugate with (l)-Trp was more active than conjugate with the (d)-isomer. In contrast, conjugates had very similar effect on both the HL-60 and MDA-MB-231 cells. In preliminary experiments, conjugate Br-vindoline-(l)-Trp-Arg8 exhibited some inhibitory effect on the tumor growth in P388 mouse leukemia tumor-bearing mice. Our results indicate that the conjugation of modified vindoline could result in an effective compound even with in vivo antitumor activity.
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Affiliation(s)
- Zoltán Bánóczi
- Department of Organic Chemistry, Eötvös Loránd University, Budapest, Hungary
| | - András Keglevich
- Department of Organic Chemistry and Technology, University of Technology and Economics, H-1111, Budapest, Gellért tér 4, Hungary
| | - Ildikó Szabó
- MTA-ELTE Research Group of Peptide Chemistry, Eötvös Loránd University, Budapest, Hungary
| | - Ivan Ranđelović
- Department of Experimental Pharmacology, National Institute of Oncology, Budapest, Hungary
| | - Zita Hegedüs
- Department of Experimental Pharmacology, National Institute of Oncology, Budapest, Hungary
| | - Fruzsina L Regenbach
- MTA-ELTE Research Group of Peptide Chemistry, Eötvös Loránd University, Budapest, Hungary
| | - Péter Keglevich
- Department of Organic Chemistry and Technology, University of Technology and Economics, H-1111, Budapest, Gellért tér 4, Hungary
| | - Zsófia Lengyel
- Department of Organic Chemistry and Technology, University of Technology and Economics, H-1111, Budapest, Gellért tér 4, Hungary
| | - Álmos Gorka-Kereskényi
- Department of Organic Chemistry and Technology, University of Technology and Economics, H-1111, Budapest, Gellért tér 4, Hungary
| | - Zsófia Dubrovay
- Spectroscopic Research Department, Gedeon Richter Plc, 10, PO Box 27, H-1475, Budapest, Hungary
| | - Viktor Háda
- Spectroscopic Research Department, Gedeon Richter Plc, 10, PO Box 27, H-1475, Budapest, Hungary
| | - Áron Szigetvári
- Spectroscopic Research Department, Gedeon Richter Plc, 10, PO Box 27, H-1475, Budapest, Hungary
| | - Csaba Szántay
- Spectroscopic Research Department, Gedeon Richter Plc, 10, PO Box 27, H-1475, Budapest, Hungary
| | - László Hazai
- Department of Organic Chemistry and Technology, University of Technology and Economics, H-1111, Budapest, Gellért tér 4, Hungary
| | - József Tóvári
- Department of Experimental Pharmacology, National Institute of Oncology, Budapest, Hungary
| | - Ferenc Hudecz
- Department of Organic Chemistry, Eötvös Loránd University, Budapest, Hungary.,MTA-ELTE Research Group of Peptide Chemistry, Eötvös Loránd University, Budapest, Hungary
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Abstract
Nuclear magnetic resonance (NMR) spectroscopy has a unique capability to probe the primary and higher order molecular structure and the structural dynamics of biomolecules at an atomic resolution, and this capability has been greatly fortified over the last five decades by an astonishing NMR instrumental and methodological development. Because of these factors, NMR has become a primary tool for the structure investigation of biomolecules, spawning a whole scientific subfield dedicated to the subject. This role of NMR is by now well established and broadly appreciated, especially in the context of academic research dealing with proteins that are purified and isotope-labeled in order to facilitate the necessary sophisticated multidimensional NMR measurements. However, the more recent industrial development, manufacturing, and quality control of biopharmaceuticals provide a different framework for NMR. For example, protein drug substances are not isotope-labeled and are present in a medium of excipients, which make structural NMR measurements much more difficult. On the other hand, biotechnology involves many other analytical requirements that can be efficiently addressed by NMR. In this respect the scope and limitations of NMR are less well understood. Having the non-expert reader in mind, herein we wish to highlight the ways in which modern NMR can effectively support biotechnological developments. Our focus will be on biosimilar proteins, pointing out certain cases where its use is probably essential. Based partly on literature data, and partly on our own hands-on experience, this paper is intended to be a guide for choosing the proper NMR approach for analytical questions concerning the structural comparability of therapeutic proteins, monitoring technology-related impurities, protein quantification, analysis of spent media, identification of extractable and leachable components, etc. Also, we focus on critical considerations, particularly those coming from drug authority guidelines, which limit the use of the well-established NMR tools in everyday practice.
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Affiliation(s)
- Róbert Kiss
- Gedeon Richter Plc, Hungary; Spectroscopic Research Department, Hungary
| | - Ádám Fizil
- Gedeon Richter Plc, Hungary; Analytical Department of Biotechnology, Hungary
| | - Csaba Szántay
- Gedeon Richter Plc, Hungary; Spectroscopic Research Department, Hungary.
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14
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Ilkei V, Spaits A, Prechl A, Müller J, Könczöl Á, Lévai S, Riethmüller E, Szigetvári Á, Béni Z, Dékány M, Martins A, Hunyadi A, Antus S, Szántay C, Balogh GT, Kalaus G, Bölcskei H, Hazai L. C8-selective biomimetic transformation of 5,7-dihydroxylated flavonoids by an acid-catalysed phenolic Mannich reaction: Synthesis of flavonoid alkaloids with quercetin and (–)-epicatechin skeletons. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.01.068] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Ilkei V, Spaits A, Prechl A, Szigetvári Á, Béni Z, Dékány M, Szántay C, Müller J, Könczöl Á, Szappanos Á, Mándi A, Antus S, Martins A, Hunyadi A, Balogh GT, Kalaus G, Bölcskei H, Hazai L, Kurtán T. Biomimetic synthesis and HPLC-ECD analysis of the isomers of dracocephins A and B. Beilstein J Org Chem 2016; 12:2523-2534. [PMID: 28144321 PMCID: PMC5238559 DOI: 10.3762/bjoc.12.247] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [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: 07/26/2016] [Accepted: 11/02/2016] [Indexed: 11/23/2022] Open
Abstract
Starting from racemic naringenin ((±)-1), a mixture of dracocephin A stereoisomers 6-(2”-pyrrolidinone-5”-yl)naringenin (±)-2a–d and its regioisomer, dracocephin B 8-(2”-pyrrolidinone-5”-yl)naringenin (±)-3a–d originally isolated from Dracocephalum rupestre, have been synthesized in a one-pot reaction. The separation of 2a–d and 3a–d was achieved by preparative HPLC. The four stereoisomers of each natural product were separated by analytical chiral HPLC and their absolute configuration was studied by the combination of HPLC–ECD measurements and TDDFT–ECD calculations. The synthesized flavonoid alkaloids were further characterized by physicochemical and in vitro pharmacological studies.
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Affiliation(s)
- Viktor Ilkei
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szt. Gellért tér 4, H-1111 Budapest, Hungary
| | - András Spaits
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szt. Gellért tér 4, H-1111 Budapest, Hungary
| | - Anita Prechl
- Gedeon Richter Plc., Gyömrői út 19-21, H-1103 Budapest, Hungary
| | - Áron Szigetvári
- Gedeon Richter Plc., Gyömrői út 19-21, H-1103 Budapest, Hungary
| | - Zoltán Béni
- Gedeon Richter Plc., Gyömrői út 19-21, H-1103 Budapest, Hungary
| | - Miklós Dékány
- Gedeon Richter Plc., Gyömrői út 19-21, H-1103 Budapest, Hungary
| | - Csaba Szántay
- Gedeon Richter Plc., Gyömrői út 19-21, H-1103 Budapest, Hungary
| | - Judit Müller
- Gedeon Richter Plc., Gyömrői út 19-21, H-1103 Budapest, Hungary
| | - Árpád Könczöl
- Gedeon Richter Plc., Gyömrői út 19-21, H-1103 Budapest, Hungary
| | - Ádám Szappanos
- Department of Organic Chemistry, University of Debrecen, P. O. Box 400, H-4002 Debrecen, Hungary
| | - Attila Mándi
- Department of Organic Chemistry, University of Debrecen, P. O. Box 400, H-4002 Debrecen, Hungary
| | - Sándor Antus
- Department of Organic Chemistry, University of Debrecen, P. O. Box 400, H-4002 Debrecen, Hungary
| | - Ana Martins
- Department of Medical Microbiology and Immunobiology, University of Szeged, Dóm tér 9, H-6720 Szeged, Hungary; Permanent address: Synthetic Systems Biology Unit, Institute of Biochemistry, Biological Research Centre, Temesvári krt. 62, H-6726 Szeged, Hungary
| | - Attila Hunyadi
- Institute of Pharmacognosy, Faculty of Pharmacy, University of Szeged, Eötvös utca 6, H-6720 Szeged, Hungary
| | | | - György Kalaus
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szt. Gellért tér 4, H-1111 Budapest, Hungary
| | - Hedvig Bölcskei
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szt. Gellért tér 4, H-1111 Budapest, Hungary
| | - László Hazai
- Department of Organic Chemistry and Technology, Budapest University of Technology and Economics, Szt. Gellért tér 4, H-1111 Budapest, Hungary
| | - Tibor Kurtán
- Department of Organic Chemistry, University of Debrecen, P. O. Box 400, H-4002 Debrecen, Hungary
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Keglevich P, Szántay C, Hazai L. The Chemistry of Galanthamine. Classical Synthetic Methods and Comprehensive Study on its Analogues. Mini Rev Med Chem 2016; 16:1450-1461. [DOI: 10.2174/1389557516666160321114556] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/22/2015] [Revised: 01/07/2016] [Accepted: 03/01/2016] [Indexed: 11/22/2022]
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Keglevich A, Hegedus L, Péter L, Gyenese J, Szántay C, Dubrovay Z, Dékány M, Szigetvári Á, Martins A, Molnár J, Hunyadi A, Keglevich P, Hazai L. Anomalous Products in the Halogenation Reactions of Vinca Alkaloids. CURR ORG CHEM 2016. [DOI: 10.2174/1385272820666160617080202] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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Keglevich P, Ábrányi-Balogh P, Szigetvári Á, Szántay C, Szántay C, Hazai L. Studies on the mechanism of quaternization of the catharanthine part of vinblastine and vincristine. Tetrahedron Lett 2016. [DOI: 10.1016/j.tetlet.2016.03.004] [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: 10/22/2022]
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Éliás O, Nógrádi K, Domány G, Szakács Z, Kóti J, Szántay C, Tarcsay Á, Keserű GM, Gere A, Kiss B, Kurkó D, Kolok S, Némethy Z, Kapui Z, Hellinger É, Vastag M, Sághy K, Kedves R, Gyertyán I. The influence of 5-HT(2A) activity on a 5-HT(2C) specific in vivo assay used for early identification of multiple acting SERT and 5-HT(2C) receptor ligands. Bioorg Med Chem Lett 2016; 26:914-920. [PMID: 26748694 DOI: 10.1016/j.bmcl.2015.12.071] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [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: 11/02/2015] [Revised: 12/18/2015] [Accepted: 12/19/2015] [Indexed: 11/16/2022]
Abstract
As a result of our exploratory programme aimed at elaborating dually acting compounds towards the serotonin (5-HT) transporter (SERT) and the 5-HT2C receptor a novel series of 3-amino-1-phenylpropoxy substituted diphenylureas was identified. From that collection two promising compounds (2 and 3) exhibiting highest 5-HT2C receptor affinity strongly inhibited the 5-HT2C receptor agonist 1-(3-chlorophenyl)piperazine (mCPP) induced hypomotility in mice. In further pursuance of that objective (2-aminoethyl)(benzyl)sulfamoyl diphenylureas and diphenylpiperazines have also been elaborated. Herein we report the synthesis of potent multiple-acting compounds from this new class. However, when two optimized representatives (6 and 14) possessing the desired in vitro profile were tested neither reduced the motor activity of mCPP treated animals. Comparative albeit limited in vitro structure-activity relationship (SAR) analysis and detailed in vivo studies are discussed and explanation for their intricate behaviour is proposed.
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Affiliation(s)
- Olivér Éliás
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | | | - György Domány
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - Zoltán Szakács
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - János Kóti
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - Csaba Szántay
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - Ákos Tarcsay
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - György M Keserű
- Research Centre for Natural Sciences, Hungarian Academy of Sciences, Budapest, PO Box 286, H-1519, Hungary
| | - Anikó Gere
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - Béla Kiss
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - Dalma Kurkó
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - Sándor Kolok
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - Zsolt Némethy
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - Zoltán Kapui
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - Éva Hellinger
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - Mónika Vastag
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - Katalin Sághy
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - Rita Kedves
- Gedeon Richter Plc, Budapest 10, PO Box 27, H-1475, Hungary
| | - István Gyertyán
- Department of Pharmacology and Pharmacotherapy, Semmelweis University, Budapest, Nagyvárad tér 4, H-1089, Hungary
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Ilkei V, Bana P, Tóth F, Palló A, Holczbauer T, Czugler M, Sánta Z, Dékány M, Szigetvári Á, Hazai L, Szántay C, Szántay C, Kalaus G. A simple synthesis of bannucine and 5′-epibannucine from (−)-vindoline. Tetrahedron 2015. [DOI: 10.1016/j.tet.2015.10.020] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Szántay C, Keglevich P, Hazai L, Dubrovay Z, Sánta Z, Dékány M, Szántay C, Kalaus G. Bisindole Alkaloids Condensed with a Cyclopropane Ring, Part 2. Cyclopropano-vinorelbine and Its Derivatives. HETEROCYCLES 2015. [DOI: 10.3987/com-14-s(k)20] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Béni Z, Orgoványi J, Kóti J, Sánta C, Horváth J, Mahó S, Szántay C. Detection by HPLC and structural characterization by NMR and MS of a natural deuterium isotopologue of ulipristal acetate. J Pharm Biomed Anal 2014; 98:279-86. [DOI: 10.1016/j.jpba.2014.06.003] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 05/27/2014] [Accepted: 06/02/2014] [Indexed: 11/29/2022]
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Szántay C, Keglevich P, Hazai L, Dubrovay Z, Szántay C, Kalaus G. Bisindole Alkaloids Condensed with a Cyclopropane Ring, Part 1. 14,15-Cyclopropanovinblastine and -vincristine. HETEROCYCLES 2014. [DOI: 10.3987/com-13-12918] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Szántay C, Keglevich P, Hazai L, Gorka-Kereskényi Á, Péter L, Gyenese J, Lengyel Z, Dubrovay Z, Kalaus G, Dékány M, Orbán E, Szabó I, Bánóczi Z, Szántay C. Synthesis and in vitro Antitumor Effect of New Vindoline Derivatives Coupled with Amino Acid Esters. HETEROCYCLES 2013. [DOI: 10.3987/com-13-12827] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Dubrovay Z, Háda V, Béni Z, Szántay C. NMR and mass spectrometric characterization of vinblastine, vincristine and some new related impurities - part I. J Pharm Biomed Anal 2012; 84:293-308. [PMID: 22985529 DOI: 10.1016/j.jpba.2012.08.019] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [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: 07/16/2012] [Revised: 08/07/2012] [Accepted: 08/14/2012] [Indexed: 10/28/2022]
Abstract
In the course of exploring the possibilities of developing a new, improved process at Gedeon Richter for the production of the "bisindole" alkaloids vinblastine (VLB) and vincristine (VCR), some novel VLB/VCR-related trace impurities were detected by analytical HPLC. Following isolation by preparative HPLC, a combination of 1D and 2D ultra high-field NMR and high-resolution (HR) (LC-)MS/MS studies allowed the structural identification and complete spectral characterization of several hitherto unpublished VLB/VCR-analogue impurities. Since the impurities could not be isolated in entirely pure forms and were available only in minute, mass-limited quantities, accessing the spectral information needed for their ab initio structure determination was met with various practical difficulties. Successful structure determination therefore relied heavily on the availability and use of detailed and definitive spectral data for both VLB and VCR. In particular, the utilization of detailed (1)H, (13)C, and (15)N NMR assignments as well as (1)H-(1)H, (1)H-(13)C and (1)H-(15)N spin-spin connectivities pertaining to different solvents for VLB/VCR base and sulphate salt was required. Although NMR studies on VLB base and other bisindoles were reported earlier in the literature, an NMR characterization of VLB and VCR under the above-mentioned circumstances and using ultra-high field instrumentation is either scarcely available or entirely lacking, therefore the necessary data had to be obtained in-house. Likewise, a modern tandem HR-ESI-MS/MS(n) fragmentation study of VLB and VCR has not been published yet. In the present paper we therefore give a thorough NMR and MS characterization of VLB and VCR specifically with a view to filling this void and to provide sufficiently extensive and solid reference data for the structural investigation of the aforementioned VLB/VCR impurities. Besides being scientifically relevant in its own right, the disclosed data should be useful for anyone interested in VLB/VCR-related molecules at a structural level.
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Affiliation(s)
- Zsófia Dubrovay
- Chemical Works of Gedeon Richter Plc., API Research and Development - Spectroscopic Research, Budapest, Hungary
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Keglevich P, Hazai L, Kalaus G, Szántay C. Modifications on the basic skeletons of vinblastine and vincristine. Molecules 2012; 17:5893-914. [PMID: 22609781 PMCID: PMC6268133 DOI: 10.3390/molecules17055893] [Citation(s) in RCA: 47] [Impact Index Per Article: 3.9] [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: 03/30/2012] [Revised: 05/09/2012] [Accepted: 05/10/2012] [Indexed: 11/18/2022] Open
Abstract
The synthetic investigation of biologically active natural compounds serves two main purposes: (i) the total synthesis of alkaloids and their analogues; (ii) modification of the structures for producing more selective, more effective, or less toxic derivatives. In the chemistry of dimeric Vinca alkaloids enormous efforts have been directed towards synthesizing new derivatives of the antitumor agents vinblastine and vincristine so as to obtain novel compounds with improved therapeutic properties.
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Affiliation(s)
| | | | | | - Csaba Szántay
- Author to whom correspondence should be addressed; ; Tel: +36-1-463-1195; Fax: +36-1-463-3297
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Szántay C, Keglevich P, Kovács P, Hazai L, Sánta Z, Dubrovay Z, Háda V, Szántay C, Kalaus G. A New Derivative of Galanthamine: Methylene Insertion into the Aromatic Ring in Place of Cyclopropanation. HETEROCYCLES 2012. [DOI: 10.3987/com-11-s(p)98] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Könczöl A, Béni Z, Sipos MM, Rill A, Háda V, Hohmann J, Máthé I, Szántay C, Keseru GM, Balogh GT. Antioxidant activity-guided phytochemical investigation of Artemisia gmelinii Webb. ex Stechm.: isolation and spectroscopic challenges of 3,5-O-dicaffeoyl (epi?) quinic acid and its ethyl ester. J Pharm Biomed Anal 2011; 59:83-9. [PMID: 22079045 DOI: 10.1016/j.jpba.2011.10.012] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/23/2011] [Revised: 10/13/2011] [Accepted: 10/14/2011] [Indexed: 01/12/2023]
Abstract
Although Artemisia gmelinii Webb. ex Stechm. has long been used in south and south-east Asia to treat many kinds of inflammatory diseases, up until now its bioactivity-coupled phytochemical characterization has not been reported. We identified one fraction of the methanolic extract of A. gmelinii as a hit in our antioxidant screening (DPPH) campaign. In order to identify the active radical scavenger components of the extract, a DPPH-HPLC spiking assay was carried out. Out of six detected known compounds caffeic acid and scopoletin had already been identified in the plant, but four of them, namely chlorogenic acid, 4-O-caffeoylquinic acid, luteolin-7-O-glucoside, and apigenin-7-O-glucoside are first described here. Moreover, the two most active compounds of the mixture, 3,5-O-dicaffeoylquinic acid (7) and its ethyl ester derivative (8) were isolated with preparative HPLC. The spectroscopic identification of 7 and 8 presented a surprising challenge due to literature ambiguities. These questions are discussed in detail.
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Affiliation(s)
- Arpád Könczöl
- Compound Profiling Laboratory, Gedeon Richter Plc., H-1475 Budapest, Hungary
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Sánta Z, Kóti J, Szoke K, Vukics K, Szántay C. Structure of the major degradant of ezetimibe. J Pharm Biomed Anal 2011; 58:125-9. [PMID: 21978828 DOI: 10.1016/j.jpba.2011.08.041] [Citation(s) in RCA: 9] [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] [Received: 08/04/2011] [Revised: 08/25/2011] [Accepted: 08/26/2011] [Indexed: 10/17/2022]
Abstract
In a recent contribution to this Journal Gajjar and Shah described the isolation and structure elucidation of the major alkaline degradant of ezetimibe, a lipid lowering agent [A.K. Gajjar, V.D. Shah, J. Pharm. Biomed. Anal. 55 (2011) 225-229]. Based on (1)H NMR, (13)C NMR and mass spectrometric studies the authors concluded that the structure of the degradant is 5-(4-fluorophenyl)-2-[(4-fluorophenylamino)-(4-hydroxyphenyl) methyl]-pent-4-enoic acid. In a subsequent "Letter to the Editor" submitted to the Journal, Barhate and Mohanra pointed out that the aforementioned structure is inconsistent with the spectroscopic data reported by Gajjar and Shah, consequently it must be wrong [Ch.R. Barhate, K. Mohanra, J. Pharm. Biomed. Anal. 55 (2011) 1237-1238]. However, Barhate and Mohanra did not offer a correct structure in their critical letter. Based on the cited NMR data we realised that previously we had had the same degradant in hand and had unambiguously determined its structure from detailed (1)H, (13)C, COSY, H-C HSQC, H-C HMBC and 1D-NOESY NMR investigations. Herein we report the correct structure to be (2R,3R,6S)-N,6-bis(4-fluorophenyl)-2-(4-hydroxyphenyl)-3,4,5,6-tetrahydro-2H-pyran-3-carboxamide. However, the structure is not new and was described earlier [G.Y.S.K. Swamy et al., Acta Cryst. E 61 (2005) o3608-o3610; K. Filip et al., J. Mol. Struct. 991 (2011) 162-170]. The aim of our present communication is to bring together the various threads of analytical effort involving this degradant into a compact and hopefully instructive conclusion on the pages of this Journal. For the sake of completeness and clarity we also list the correct NMR spectral assignments for ezetimibe which was also given partly erroneously in the earlier literature, and we propose a mechanism for the formation of the degradant.
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Affiliation(s)
- Zsuzsanna Sánta
- Gedeon Richter Plc, 1103 Budapest Gyömrői út 19-21, Hungary.
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Herke K, Hazai L, Sánta Z, Dubrovay Z, Háda V, Szántay C, Kalaus G, Szántay C. An unexpected rearrangement of the benzofurobenzazepine skeleton of galanthamine-type alkaloids. Tetrahedron Lett 2010. [DOI: 10.1016/j.tetlet.2010.10.158] [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: 10/18/2022]
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Bánóczi Z, Gorka-Kereskényi Á, Reményi J, Orbán E, Hazai L, Tökési N, Oláh J, Ovádi J, Béni Z, Háda V, Szántay C, Hudecz F, Kalaus G, Szántay C. Synthesis and in vitro antitumor effect of vinblastine derivative-oligoarginine conjugates. Bioconjug Chem 2010; 21:1948-55. [PMID: 20973492 DOI: 10.1021/bc100028z] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Vinblastine is a widely used anticancer drug with undesired side effects. Its conjugation with carrier molecules could be an efficient strategy to reduce these side effects. Besides this, the conjugate could exhibit increased efficiency against resistant cells, e.g., due to the altered internalization pathway. Oligoarginines, as cell-penetrating peptides, can transport covalently attached compounds into different kinds of cells and enhance the efficiency of those compounds. We report here the coupling of vinblastine through its carboxyl group at position 16 with the N-terminal amino function of L-Trp methyl ester. After hydrolysis of the ester group, 17-desacetylvinblastineTrp was conjugated to the N-terminal amino group of oligoarginine via the C-terminal carboxyl group of the Trp moiety in solution. The antitumor effect of conjugates was studied on sensitive and resistant human leukemia (HL-60) cells in vitro. Our data suggest that all conjugates investigated possess an antiproliferative effect against the studied cells. However, the effect was dependent on the number of Arg residues in the conjugates: Arg₈ > Arg₆ ≫ Arg₄. The conjugate with Arg₈ exhibited similar efficicacy as compared with free 17-desacetylvinblastineTrp. The in vitro studies also showed that the tubulin binding ability of vinblastine was essentially preserved even in the octaarginine conjugate. We also observed that two isomers were formed during conjugation. These isomers showed different levels of activity against tubulin polymerization in vitro and in vivo. The 17-desacetylvinblastineTrp-Arg₈-1 isomer conjugate possessed high selectivity against the mitotic spindles. HRMS and NMR data suggest that 17-desacetylvinblastineTrp-Arg₈-1 and 17-desacetylvinblastineTrp-Arg₈-2 are epimers at the tryptophan α carbon atom.
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Moldvai I, Kálmán A, Szántay C, Tóth G, Vedres A. Synthesis of vinca alkaloids and related compounds XXXVIII: Formation of dimers under Polonovski reaction conditions. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19881070407] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Moldvai I, Gács-Baitz E, Szántay C. Chemistry of indoles carrying basic functions. I. Transformation of hydroxyindolones into indoles. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/recl.19911101102] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Herke K, Hazai L, Hudák MS, Ábrahám J, Sánta Z, Háda V, Szántay C, Szántay C. Synthesis of the tetracyclic skeleton of the galanthamine-type Amaryllidaceae alkaloids. ARKIVOC 2009. [DOI: 10.3998/ark.5550190.0010.b21] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
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Dancsó A, Kajtár-Peredy M, Szántay C. Synthesis of vinca alkaloids and related compounds. XLVI.. Formation of a new ring system. J Heterocycl Chem 2009. [DOI: 10.1002/jhet.5570260662] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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Kalaus G, Szabó L, Éles J, Szántay C, Juhász I, Greiner I, Brlik J, Kajtár-Peredy M. Synthesis of vinca alkaloids and related compounds part 94. Epimerization of compounds with aspidospermane andD-secoaspidospermane skeleton. J Heterocycl Chem 2009. [DOI: 10.1002/jhet.5570370205] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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Tóth F, Oláh J, Kalaus G, Greiner I, Szőllősy Á, Gömöry Á, Hazai L, Szántay C. Synthesis of vinca alkaloids and related compounds. Part 110: A new synthetic method for the preparation of pandoline-type alkaloid-like molecules. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.06.015] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Incze M, Dörnyei G, Moldvai I, Temesvári-Major E, Egyed O, Szántay C. New routes to clavine-type ergot alkaloids. Part 2: Synthesis of the last, so far not yet synthesized member of the clavine alkaloid family, (±)-cycloclavine. Tetrahedron 2008. [DOI: 10.1016/j.tet.2008.01.101] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Nemes A, Czibula L, Szántay, Jr. C, Gere A, Kiss B, Laszy J, Gyertyán I, Szombathelyi Z, Szántay C. Synthesis and Evaluation of 2′-Hydroxyethyl trans-Apovincaminate Derivatives as Antioxidant and Cognitive Enhancer Agents. J Med Chem 2008; 51:479-86. [DOI: 10.1021/jm070618k] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Affiliation(s)
- András Nemes
- Gedeon Richter Ltd., Budapest 10, POB 27, H-1475, Hungary, and Budapest University of Technology and Economics, Gellért tér 4,H-1521, Budapest, Hungary
| | - László Czibula
- Gedeon Richter Ltd., Budapest 10, POB 27, H-1475, Hungary, and Budapest University of Technology and Economics, Gellért tér 4,H-1521, Budapest, Hungary
| | - Csaba Szántay, Jr.
- Gedeon Richter Ltd., Budapest 10, POB 27, H-1475, Hungary, and Budapest University of Technology and Economics, Gellért tér 4,H-1521, Budapest, Hungary
| | - Anikó Gere
- Gedeon Richter Ltd., Budapest 10, POB 27, H-1475, Hungary, and Budapest University of Technology and Economics, Gellért tér 4,H-1521, Budapest, Hungary
| | - Béla Kiss
- Gedeon Richter Ltd., Budapest 10, POB 27, H-1475, Hungary, and Budapest University of Technology and Economics, Gellért tér 4,H-1521, Budapest, Hungary
| | - Judit Laszy
- Gedeon Richter Ltd., Budapest 10, POB 27, H-1475, Hungary, and Budapest University of Technology and Economics, Gellért tér 4,H-1521, Budapest, Hungary
| | - István Gyertyán
- Gedeon Richter Ltd., Budapest 10, POB 27, H-1475, Hungary, and Budapest University of Technology and Economics, Gellért tér 4,H-1521, Budapest, Hungary
| | - Zsolt Szombathelyi
- Gedeon Richter Ltd., Budapest 10, POB 27, H-1475, Hungary, and Budapest University of Technology and Economics, Gellért tér 4,H-1521, Budapest, Hungary
| | - Csaba Szántay
- Gedeon Richter Ltd., Budapest 10, POB 27, H-1475, Hungary, and Budapest University of Technology and Economics, Gellért tér 4,H-1521, Budapest, Hungary
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Moldvai I, Dömyei G, Temesvári-Major E, Szántay C. A PRACTICAL ONE-POT SYNTHESIS OF WEINREB-LIKE AMIDES OF (S)- AND (R)-N-BOC-PIPECOLIC ACIDS FROM (+)-PIPERIDINE-2-CARBOXYLIC ACID. ORG PREP PROCED INT 2007. [DOI: 10.1080/00304940709458602] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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Vinczer P, Baán G, Juvancz Z, Novák L, Szántay C. Simple and Stereocontrolled Synthesis of an Optimal Isomeric Mixture of 3,13-Octadecadien-1-YL Acetates. SYNTHETIC COMMUN 2007. [DOI: 10.1080/00397918508077274] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Moldvai I, Russo L, Rissanen K, Kardos J, Gács-Baitz E, Termesvári-Major E, Pápai I, Szárics É, Szántay C. Dimerization of (+)-Lysergic Acid Esters. HETEROCYCLES 2007. [DOI: 10.3987/com-07-11011] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Kalaus G, Tóth F, Greiner I, Kajtár-Peredy M, Gömöry Á, Hazai L, Szántay C. Synthesis of Vinca Alkaloids and Related Compounds. Part 107. An Efficient Convergent Synthetic Pathway to Build up the Ibophyllidine Skeleton III. Total Synthesis of (±)-Ibophyllidine and (±)-20-Epiibophyllidine. HETEROCYCLES 2007. [DOI: 10.3987/com-07-10991] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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