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Synthesis and characterization of violurate - based Mn(II) and Cu(II) complexes nano-crystallites as DNA-binders and therapeutics agents against SARS-CoV-2 virus. JOURNAL OF SAUDI CHEMICAL SOCIETY 2022. [PMCID: PMC9354444 DOI: 10.1016/j.jscs.2022.101528] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
Synthesis and structural characterization of nano crystallites of bis-violurate-based manganese(II) and copper(II) chelates is the subject of the present study. Analytical data and mass spectra as well as thermal analysis determined the molecular formulas of the present metal chelates. Spectroscopic and magnetic measurements assigned the structural formula of the present violurate metal complexes. The spectroscopic and magnetic investigations along with structural analysis results indicated the square planar geometry of both the Mn(II) and Cu(II) complexes. The structural analysis of the synthesized metal complexes was achieved by processing the PXRD data using specialized software Expo 2014. Spectrophotometeric and viscosity measurements showed that violuric acid and its Mn(II) and Cu(II) complexes successfully bind to DNA with intrinsic binding constants Kb from 38.2 × 105 to 26.4 × 106 M−1. The antiviral activity study displayed that the inhibitory concentrations (IC50) of SARS-CoV-2 by violuric acid and its Mn(II) and Cu(II) complexes are 84.01, 39.58 and 44.86 μM respectively. Molecular docking calculations were performed on the SARS-CoV-2 virus protein and the computed binding energy values are −0.8, −3.860 −5.187 and −4.790, kcal/mol for the native ligand, violuric acid and its Mn(II) and Cu(II) complexes respectively. Insights into the relationship between structures of the current compounds and their degree of reactivity are discussed.
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Orlandin A, Guryanov I, Ferrazzano L, Biondi B, Biscaglia F, Storti C, Rancan M, Formaggio F, Ricci A, Cabri W. Carbodiimide-Mediated Beckmann Rearrangement of Oxyma-B as a Side Reaction in Peptide Synthesis. Molecules 2022; 27:molecules27134235. [PMID: 35807480 PMCID: PMC9268172 DOI: 10.3390/molecules27134235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Revised: 06/27/2022] [Accepted: 06/28/2022] [Indexed: 12/10/2022] Open
Abstract
The suppression of side reactions is one of the most important objectives in peptide synthesis, where highly reactive compounds are involved. Recently, the violuric acid derivative Oxyma-B was introduced into peptide synthesis protocols as a promising additive to efficiently control the optical purity of the amino acids prone to racemization. However, we discovered a side reaction involving the Beckmann rearrangement of Oxyma-B during the coupling reaction, which compromises the yield and purity of the target peptides. Here, we present the investigation of the mechanism of this rearrangement and the optimization of the coupling reaction conditions to control it. These results can be taken into account for the design of novel efficient oxime-based coupling reagents.
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Affiliation(s)
- Andrea Orlandin
- Fresenius Kabi iPSUM Srl, Via San Leonardo 23, 45010 Villadose, Italy; (A.O.); (W.C.)
| | - Ivan Guryanov
- Fresenius Kabi iPSUM Srl, Via San Leonardo 23, 45010 Villadose, Italy; (A.O.); (W.C.)
- Institute of Chemistry, St. Petersburg State University, Peterhof, Universitetskij pr. 26, 198504 St. Petersburg, Russia
- Correspondence: (I.G.); (A.R.)
| | - Lucia Ferrazzano
- Department of Chemistry “Giacomo Ciamician”, University of Bologna, Via Selmi 2, 40126 Bologna, Italy;
| | - Barbara Biondi
- ICB, Padova Unit, CNR, Department of Chemistry, University of Padova, Via Marzolo 1, 35131 Padova, Italy; (B.B.); (F.B.); (C.S.); (F.F.)
| | - Francesca Biscaglia
- ICB, Padova Unit, CNR, Department of Chemistry, University of Padova, Via Marzolo 1, 35131 Padova, Italy; (B.B.); (F.B.); (C.S.); (F.F.)
| | - Claudia Storti
- ICB, Padova Unit, CNR, Department of Chemistry, University of Padova, Via Marzolo 1, 35131 Padova, Italy; (B.B.); (F.B.); (C.S.); (F.F.)
| | - Marzio Rancan
- ICMATE, CNR, Department of Chemistry, University of Padova, Via Marzolo 1, 35131 Padova, Italy;
| | - Fernando Formaggio
- ICB, Padova Unit, CNR, Department of Chemistry, University of Padova, Via Marzolo 1, 35131 Padova, Italy; (B.B.); (F.B.); (C.S.); (F.F.)
| | - Antonio Ricci
- Fresenius Kabi iPSUM Srl, Via San Leonardo 23, 45010 Villadose, Italy; (A.O.); (W.C.)
- Correspondence: (I.G.); (A.R.)
| | - Walter Cabri
- Fresenius Kabi iPSUM Srl, Via San Leonardo 23, 45010 Villadose, Italy; (A.O.); (W.C.)
- Department of Chemistry “Giacomo Ciamician”, University of Bologna, Via Selmi 2, 40126 Bologna, Italy;
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Lorenz V, Liebing P, Müller M, Hilfert L, Feneberg M, Kluth E, Kühling M, Buchner MR, Goldhahn R, Edelmann FT. Small compound - big colors: synthesis and structural investigation of brightly colored alkaline earth metal 1,3-dimethylviolurates. Dalton Trans 2022; 51:7975-7985. [PMID: 35546049 DOI: 10.1039/d2dt00606e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A series of brightly colored alkaline earth metal 1,3-dimethylviolurates M(Me2Vio)2 have been prepared and fully characterized. The title compounds AE(Me2Vio)2·nH2O (AE = Mg, n = 6 (3); AE = Ca, n = 8 (4), AE = Sr, n = 6 (5); AE = Ba, n = 4 (6)) were obtained by neutralizing 1,3-dimethylvioluric acid monohydrate (=H(Me2Vio)·H2O; 2) with 0.5 equiv. of the corresponding metal dihydroxides AE(OH)2. The hair-like appearance of the Sr derivative 5 prevented the growth of single-crystals. This problem could be solved by crystallizing the crown ether derivative Sr(Me2Vio)2(18-crown-6) (5a). The isolated salts exhibit intense colors ranging from red to purple. Various attempts to prepare the beryllium derivative Be(Me2Vio)2 failed. Instead, work-up of the reaction mixtures provided pink crystals of a new modification of 2 formulated as [H3O][Me2Vio] (2b) as shown by an X-ray diffraction study. An unexpected oxidation reaction of the barium salt Ba(Me2Vio)2 led to formation of the novel mixed-anion salt Ba(Me2Vio)(Me2NO2Barb)·2H2O (8, Me2NO2Barb- = 1,3-dimethyl-5-nitrobarbiturate anion). Compound 8 could also be synthesized deliberately by treatment of Ba(OH)2 with a 1 : 1 mixture of 2 and 1,3-dimethyl-5-nitrobarbituric acid (7, =H(Me2NO2Barb)·H2O). All new compounds were fully characterized by their IR, Raman, NMR (1H, 13C{1H}) and UV-vis spectra as well as elemental analyses. Single-crystal X-ray diffraction studies revealed that the solid-state structures of compounds 3, 4, 5a and 6 are governed by the typical coordination behavior of the alkaline-earth metals, i.e. increasing coordination numbers and a decreasing degree of hydration when going from Mg to Ba. The dimensions of the structures range from hydrogen-bonded ions (3) over monomeric, neutral complex molecules (4, 5a), to polymeric networks (6). The successful isolation of the mixed-anion barium salt 8 adds a new facet to the coordination chemistry of violurate and related ligands.
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Affiliation(s)
- Volker Lorenz
- Chemisches Institut, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
| | - Phil Liebing
- Chemisches Institut, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany.,Institut für Anorganische und Analytische Chemie, Humboldtstr. 8, 07743 Jena, Germany
| | - Matthias Müller
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany
| | - Liane Hilfert
- Chemisches Institut, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
| | - Martin Feneberg
- Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany.
| | - Elias Kluth
- Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany.
| | - Marcel Kühling
- Chemisches Institut, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany
| | - Magnus R Buchner
- Fachbereich Chemie, Philipps-Universität Marburg, Hans-Meerwein-Straße 4, 35032 Marburg, Germany
| | - Rüdiger Goldhahn
- Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany.
| | - Frank T Edelmann
- Institut für Physik, Otto-von-Guericke-Universität Magdeburg, Universitätsplatz 2, 39106 Magdeburg, Germany.
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Jia X, Zhang W, Guo D, Wang T, Xu Z, Wang T, Guo H, Kong W, Zhang J, Wang J. Construction of targeted drug-loaded composite polysaccharide hydrogels and verification of anti-tumor effect in vitro. NEW J CHEM 2022. [DOI: 10.1039/d2nj03331c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A targeted composite polysaccharide drug-loaded gel was obtained and characterized. It displayed potent anti-tumor activity via specific binding between the folate in the gel and the folate receptors in the cell membrane.
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Affiliation(s)
- Xiaoyan Jia
- College of Life Science, Northwest Normal University, Lanzhou 730070, P. R. China
| | - Wenyu Zhang
- College of Life Science, Northwest Normal University, Lanzhou 730070, P. R. China
| | - Duoduo Guo
- College of Life Science, Northwest Normal University, Lanzhou 730070, P. R. China
| | - Tingfeng Wang
- College of Life Science, Northwest Normal University, Lanzhou 730070, P. R. China
| | - Zhichao Xu
- College of Life Science, Northwest Normal University, Lanzhou 730070, P. R. China
| | - Tao Wang
- Gansu Provincial Academic Institute for Medical Research, Lanzhou 730050, P. R. China
| | - Hongyun Guo
- Gansu Provincial Academic Institute for Medical Research, Lanzhou 730050, P. R. China
| | - Weibao Kong
- College of Life Science, Northwest Normal University, Lanzhou 730070, P. R. China
| | - Ji Zhang
- College of Life Science, Northwest Normal University, Lanzhou 730070, P. R. China
- Bioactive Products Engineering Research Center for Gansu Distinctive Plants, Northwest Normal University, Lanzhou 730070, P. R. China
- Institute of New Rural Development, Northwest Normal University, Lanzhou 730070, P. R. China
| | - Junlong Wang
- College of Life Science, Northwest Normal University, Lanzhou 730070, P. R. China
- Bioactive Products Engineering Research Center for Gansu Distinctive Plants, Northwest Normal University, Lanzhou 730070, P. R. China
- Institute of New Rural Development, Northwest Normal University, Lanzhou 730070, P. R. China
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Synthesis and Structural Investigation of a Complete Series of Brightly Colored Alkali Metal 1,3‐Dimethylviolurates. Z Anorg Allg Chem 2020. [DOI: 10.1002/zaac.202000356] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Arunadevi A, Raman N. Biological response of Schiff base metal complexes incorporating amino acids – a short review. J COORD CHEM 2020. [DOI: 10.1080/00958972.2020.1824293] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
Affiliation(s)
| | - Natarajan Raman
- Research Department of Chemistry, VHNSN College, Virudhunagar, India
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A binuclear ruthenium polypyridyl complex: synthesis, characterization, pH luminescence sensor and electrochemical properties. TRANSIT METAL CHEM 2020. [DOI: 10.1007/s11243-020-00420-w] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Berg DJ, Twamley B. Crystal structure of a binuclear mixed-valence ytterbium complex containing a 2-anthracene-substituted phenoxide ligand. ACTA CRYSTALLOGRAPHICA SECTION E-CRYSTALLOGRAPHIC COMMUNICATIONS 2019; 75:1367-1371. [PMID: 31523468 PMCID: PMC6727046 DOI: 10.1107/s205698901901154x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/14/2019] [Accepted: 08/17/2019] [Indexed: 11/17/2022]
Abstract
The crystal structure of a binuclear mixed-valence ytterbium complex containing bridging and terminal 2-anthracene-substituted phenoxide ligands is described. One of the bridging ligands shows a π-interaction between an anthracene bond and the ytterbium(II) centre. Reaction of 2-(anthracen-9-yl)phenol (HOPhAn, 1) with divalent Yb[N(SiMe3)2]2·2THF in THF–toluene mixtures affords the mixed-valence YbII–YbIII dimer {[2-(anthracen-9-yl)phenolato-κO]bis(tetrahydrofuran)ytterbium(III)}-tris[μ-2-(anthracen-9-yl)phenolato]-κ4O:O;κO:1,2-η,κO-{[2-(anthracen-9-yl)phenolato-κO]ytterbium(II)} toluene trisolvate, [Yb2(C20H13O)5(C4H8O)2]·3C7H7 or [YbIII(THF)2(OPhAn)](μ-OPhAn)3[YbII(OPhAn)]·3C7H7 (2), as the major product. It crystallized as a toluene trisolvate. The Yb—O bond lengths in the crystal structure of this dimer clearly identify the YbII and YbIII centres. Interestingly, the formally four-coordinate YbII centre shows a close contact with one anthracene C—C bond of a bridging OPhAn ligand, bringing the formal coordination number to five.
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Affiliation(s)
- David J Berg
- Department of Chemistry, University of Victoria, PO Box 1700 Stn CSC, Victoria, BC, V8W 2Y2, Canada
| | - Brendan Twamley
- School of Chemistry, Trinity College Dublin, University of Dublin, Dublin 2, Ireland
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