1
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Yadav M, Singh VP. Glutathione Peroxidase-like Antioxidant Activity of 1,3-Benzoselenazoles: Synthesis and In Silico Molecular Docking Studies as Pancreatic Lipase Inhibitors. J Org Chem 2023; 88:16934-16948. [PMID: 38008916 DOI: 10.1021/acs.joc.3c01762] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2023]
Abstract
The synthesis of 1,3-benzoselenazoles was achieved by the reaction of corresponding bis[3-amino-N-(p-tolyl)benzamide-2-yl] diselenide, bis[3-amino-N-(4-methoxyphenyl)benzamide-2-yl] diselenide, and bis[3-amino-N-(4-(dimethylamino)phenyl) benzamide-2-yl] diselenide with aryl aldehydes. The 1,3-benzoselenazoles continued to exist as planar molecules due to the presence of secondary Se···O interactions as revealed by the single-crystal X-ray analysis. The presence of secondary Se···O interactions in 1,3-benzoselenazoles was confirmed using natural bond orbital (NBO) and atoms in molecules (AIM) calculations. Nucleus-independent chemical shift (NICS) values suggested the presence of aromatic character in a five-membered benzoselenazole heterocyclic ring. The glutathione peroxidase (GPx)-like antioxidant activity of all 1,3-benzoselenazoles was assessed using a thiophenol assay, exhibiting greater antioxidant activity than Ph2Se2 used as a reference. The most active catalyst carrying a strong electron-donating group (-NMe2) at the ortho-position to the benzoselenazole ring was further investigated at different concentrations of thiophenol, H2O2, and 1,3-benzoselenazoles as catalyst for determining their catalytic parameters. Moreover, the potential applications of all 1,3-benzoselenazoles against pancreatic lipase (PL) have been identified using in silico interactions between the active sites of the 1LPB protein as evaluated using a molecular docking study.
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Affiliation(s)
- Manisha Yadav
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Sector-14, Chandigarh 160 014, India
| | - Vijay P Singh
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Sector-14, Chandigarh 160 014, India
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2
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Hejda M, Doležal L, Blahut J, Hupf E, Tydlitát J, Jambor R, Růžička A, Beckmann J, Dostál L. N-Coordinated tellurenium(II) and telluronium(IV) cations: synthesis, structure and hydrolysis. Dalton Trans 2023; 52:16235-16248. [PMID: 37853810 DOI: 10.1039/d3dt02404k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2023]
Abstract
A set of N-coordinated tellurium(II) compounds containing either C,N-chelating ligands CNR (where CN = 2-(RNCH)C6H4, R = tBu or Dipp; Dipp = 2,6-iPr2C6H3) or N,C,N pincer ligands NCNR (where NCN = 2,6-(RNCH)2C6H4, R = tBu or Dipp) were synthesized. In the case of C,N-chelated compounds, the reaction of CNDippLi with Te(dtc)2 (where dtc = Et2NCS2) in a 1 : 1 molar ratio smoothly provided the carbamate CNDippTe(dtc) which upon treatment with 2 eq. of HCl provided the chloride CNDippTeCl. In contrast, the analogous conversion of NCNRLi with Te(dtc)2 surprisingly furnished ionic bromides [NCNRTe]Br as a result of the exchange of dtc by Br coming from nBuBr present in the reaction mixture. Furthermore, the reaction of CNDippTeCl or [NCNRTe]Br with silver salts AgX (X = OTf or SbF6) provided the expected tellurenium cations [CNDippTe]SbF6 and [NCNRTe]X. To further increase the Lewis acidity of the central atom, the oxidation of selected compounds with 1 eq. of SO2Cl2 was examined yielding stable compounds [CNtBuTeCl2]X and [NCNtBuTeCl2]X. The oxidation of the Dipp substituted compounds proved to be more challenging and an excess of SO2Cl2 was necessary to obtain the oxidized products [CNDippTeCl2]SbF6 and [NCNDippTeCl2]SbF6, which could solely be characterized in solution. Compounds [CNtBuTeCl2]OTf and [NCNtBuTeCl2]OTf were shown to undergo a controlled hydrolysis to the corresponding telluroxanes. All compounds were studied by multinuclear NMR spectroscopy in solution and for selected compounds solid state 125Te NMR spectroscopy and single-crystal X-ray diffraction analysis were performed. The Lewis acidity of the studied cations was examined by the Gutmann-Beckett method using Et3PO as the probing agent. The Te-N chalcogen bonding situation of selected compounds has also been examined computationally by a set of real-space bonding indicators.
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Affiliation(s)
- Martin Hejda
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic.
| | - Lukáš Doležal
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic.
| | - Jan Blahut
- Institute of Organic Chemistry and Biochemistry, Czech Academy of Science, Flemingovo nám. 2, 16610, Prague, Czech Republic
| | - Emanuel Hupf
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Straße 7, 28359 Bremen, Germany.
| | - Jiří Tydlitát
- Institute of Organic Chemistry and Technology, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic
| | - Roman Jambor
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic.
| | - Aleš Růžička
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic.
| | - Jens Beckmann
- Institut für Anorganische Chemie und Kristallographie, Universität Bremen, Leobener Straße 7, 28359 Bremen, Germany.
| | - Libor Dostál
- Department of General and Inorganic Chemistry, Faculty of Chemical Technology, University of Pardubice, Studentská 573, CZ-532 10 Pardubice, Czech Republic.
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3
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Sonego JM, de Diego SI, Szajnman SH, Gallo-Rodriguez C, Rodriguez JB. Organoselenium Compounds: Chemistry and Applications in Organic Synthesis. Chemistry 2023; 29:e202300030. [PMID: 37378970 DOI: 10.1002/chem.202300030] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/04/2023] [Revised: 06/18/2023] [Accepted: 06/28/2023] [Indexed: 06/29/2023]
Abstract
Selenium, originally described as a toxin, turns out to be a crucial trace element for life that appears as selenocysteine and its dimer, selenocystine. From the point of view of drug developments, selenium-containing drugs are isosteres of sulfur and oxygen with the advantage that the presence of the selenium atom confers antioxidant properties and high lipophilicity, which would increase cell membrane permeation leading to better oral bioavailability. In this article, we have focused on the relevant features of the selenium atom, above all, the corresponding synthetic approaches to access a variety of organoselenium molecules along with the proposed reaction mechanisms. The preparation and biological properties of selenosugars, including selenoglycosides, selenonucleosides, selenopeptides, and other selenium-containing compounds will be treated. We have attempted to condense the most important aspects and interesting examples of the chemistry of selenium into a single article.
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Affiliation(s)
- Juan M Sonego
- Departamento de Química Orgánica Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA, Buenos Aires, Argentina
- CONICET-Universidad de Buenos Aires, Unidad de Microanálisis y Métodos Físicos en Química Orgánica (UMYMFOR), C1428EHA, Buenos Aires, Argentina
| | - Sheila I de Diego
- Departamento de Química Orgánica Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA, Buenos Aires, Argentina
- CONICET-Universidad de Buenos Aires, Unidad de Microanálisis y Métodos Físicos en Química Orgánica (UMYMFOR), C1428EHA, Buenos Aires, Argentina
| | - Sergio H Szajnman
- Departamento de Química Orgánica Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA, Buenos Aires, Argentina
- CONICET-Universidad de Buenos Aires, Unidad de Microanálisis y Métodos Físicos en Química Orgánica (UMYMFOR), C1428EHA, Buenos Aires, Argentina
| | - Carola Gallo-Rodriguez
- Departamento de Química Orgánica Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA, Buenos Aires, Argentina
- CONICET-Universidad de Buenos Aires, Centro de Investigaciones en Hidratos de Carbono (CIHIDECAR), C1428EHA, Buenos Aires, Argentina
| | - Juan B Rodriguez
- Departamento de Química Orgánica Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Pabellón 2, C1428EHA, Buenos Aires, Argentina
- CONICET-Universidad de Buenos Aires, Unidad de Microanálisis y Métodos Físicos en Química Orgánica (UMYMFOR), C1428EHA, Buenos Aires, Argentina
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4
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Yadav M, Kumar M, Chahal A, Sodhi N, Chhillar B, Alajangi HK, Barnwal RP, Singh VP. Synthesis, Reactions, and Antioxidant Properties of Bis(3-amino-1-hydroxybenzyl)diselenide. J Org Chem 2023; 88:3509-3522. [PMID: 36847416 DOI: 10.1021/acs.joc.2c02739] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/01/2023]
Abstract
Bis(3-amino-1-hydroxybenzyl)diselenide containing two ortho groups was synthesized from 7-nitro-3H-2,1-benzoxaselenole and in situ generated sodium benzene tellurolate (PhTeNa). One-pot synthesis of 1,3-benzoselenazoles was achieved from bis(3-amino-1-hydroxybenzyl)diselenide and aryl aldehydes using acetic acid as a catalyst. The X-ray crystal structure of chloro-substituted benzoselenazole revealed a planar structure with T-shaped geometry around the Se atom. Both natural bond orbital and atoms in molecules calculations confirmed the presence of secondary Se···H interactions in bis(3-amino-1-hydroxybenzyl)diselenide and Se···O interactions in benzoselenazoles, respectively. The glutathione peroxidase (GPx)-like antioxidant activities of all compounds were evaluated using a thiophenol assay. Bis(3-amino-1-hydroxybenzyl)diselenide and benzoselenazoles showed better GPx-like activity compared to that of the diphenyl diselenide and ebselen, used as references, respectively. Based on 77Se{1H} NMR spectroscopy, a catalytic cycle for bis(3-amino-1-hydroxybenzyl)diselenide using thiophenol and hydrogen peroxide was proposed involving selenol, selenosulfide, and selenenic acid as intermediates. The potency of all GPx mimics was confirmed by their in vitro antibacterial properties against the biofilm formation of Bacillus subtilis and Pseudomonas aeruginosa. Additionally, molecular docking studies were used to evaluate the in silico interactions between the active sites of the TsaA and LasR-based proteins found in Bacillus subtilis and Pseudomonas aeruginosa.
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Affiliation(s)
- Manisha Yadav
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Sector-14, Chandigarh 160 014, India
| | - Manish Kumar
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Sector-14, Chandigarh 160 014, India
| | - Alka Chahal
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Sector-14, Chandigarh 160 014, India
| | - Nikhil Sodhi
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Sector-14, Chandigarh 160 014, India
| | - Babli Chhillar
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Sector-14, Chandigarh 160 014, India
| | - Hema Kumari Alajangi
- Department of Biophysics, Panjab University, Sector-25, Chandigarh 160 014, India
| | - Ravi Pratap Barnwal
- Department of Biophysics, Panjab University, Sector-25, Chandigarh 160 014, India
| | - Vijay P Singh
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Sector-14, Chandigarh 160 014, India
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5
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Kumar M, Singh VP. Synthesis and antioxidant activities of N-thiophenyl ebselenamines: a 77Se{ 1H} NMR mechanistic study. NEW J CHEM 2022. [DOI: 10.1039/d2nj01225a] [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
Synthesis of N-thiophenyl ebselenamines and selenenyl sulphides as efficient radical-trapping and hydroperoxide-decomposing antioxidants, respectively has been described.
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Affiliation(s)
- Manish Kumar
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Sector-14, Chandigarh 160 014, India
| | - Vijay P. Singh
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Sector-14, Chandigarh 160 014, India
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6
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Tripathi A, Daolio A, Pizzi A, Guo Z, Turner DR, Baggioli A, Famulari A, Deacon GB, Resnati G, Singh HB. Chalcogen Bonds in Selenocysteine Seleninic Acid, a Functional GPx Constituent, and in Other Seleninic or Sulfinic Acid Derivatives. Chem Asian J 2021; 16:2351-2360. [PMID: 34214252 PMCID: PMC8456948 DOI: 10.1002/asia.202100545] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2021] [Revised: 07/01/2021] [Indexed: 11/24/2022]
Abstract
The controlled oxidation reaction of L-selenocystine under neutral pH conditions affords selenocysteine seleninic acid (3-selenino-L-alanine) which is characterized also by means of single-crystal X-ray diffraction. This technique shows that selenium forms three chalcogen bonds (ChBs), one of them being outstandingly short. A survey of seleninic acid derivatives in the Cambridge Structural Database (CSD) confirms that the C-Se(=O)O- functionality tends to act as a ChB donor robust enough to systematically influence the interactional landscape in the solid. Quantum Theory of Atom in Molecules (QTAIM) analysis proves the attractive nature of the short contacts observed in crystals containing the seleninic functionality and calculation of surface molecular electrostatic potential (MEP) reveals that remarkably positive σ-holes can frequently be found opposite to the covalent bonds at selenium. Both CSD searches and QTAIM and MEP approaches show that also the sulfinic acid moiety can function as a ChB donor, albeit less frequently than the seleninic acid one. These findings may contribute to a better understanding, at the atomic level, of the mechanism of action of the enzymes that control oxidative stress and ROS deactivation and that contain selenocysteine seleninic acid and cysteine sulfinic acid in the active site.
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Affiliation(s)
- Abhishek Tripathi
- Department of ChemistryIndian Institute of Technology BombayMumbai400076India
- School of ChemistryMonash UniversityClaytonVictoria3800Australia
- IITB-Monash Research AcademyMonash UniversityPowai, Mumbai400076India
| | - Andrea Daolio
- Department of Chemistry, Materials and Chemical Engineering“Giulio Natta”Politecnico di MilanoVia Luigi Mancinelli 720131MilanoItaly
| | - Andrea Pizzi
- Department of Chemistry, Materials and Chemical Engineering“Giulio Natta”Politecnico di MilanoVia Luigi Mancinelli 720131MilanoItaly
| | - Zhifang Guo
- School of ChemistryMonash UniversityClaytonVictoria3800Australia
| | - David R. Turner
- School of ChemistryMonash UniversityClaytonVictoria3800Australia
- IITB-Monash Research AcademyMonash UniversityPowai, Mumbai400076India
| | - Alberto Baggioli
- Department of Chemistry, Materials and Chemical Engineering“Giulio Natta”Politecnico di MilanoVia Luigi Mancinelli 720131MilanoItaly
| | - Antonino Famulari
- Department of Chemistry, Materials and Chemical Engineering“Giulio Natta”Politecnico di MilanoVia Luigi Mancinelli 720131MilanoItaly
| | - Glen B. Deacon
- School of ChemistryMonash UniversityClaytonVictoria3800Australia
- IITB-Monash Research AcademyMonash UniversityPowai, Mumbai400076India
| | - Giuseppe Resnati
- Department of Chemistry, Materials and Chemical Engineering“Giulio Natta”Politecnico di MilanoVia Luigi Mancinelli 720131MilanoItaly
| | - Harkesh B. Singh
- Department of ChemistryIndian Institute of Technology BombayMumbai400076India
- IITB-Monash Research AcademyMonash UniversityPowai, Mumbai400076India
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7
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Saravanan R, Singh HB, Butcher RJ. Bis(2-nitrophenyl) selenide, bis(2-aminophenyl) selenide and bis(2-aminophenyl) telluride: structural and theoretical analysis. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2021; 77:271-280. [PMID: 34089250 DOI: 10.1107/s2053229621005015] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 05/11/2021] [Indexed: 11/10/2022]
Abstract
Three organoselenium and organotellurium compounds containing ortho substitutents, namely, bis(2-nitrophenyl) selenide, C12H8N2O4Se, 2, bis(2-aminophenyl) selenide, C12H12N2Se, 3, and bis(2-aminophenyl) telluride, C12H12N2Te, 7, have been investigated by both structural and theoretical methods. In the structures of all three compounds, there are intramolecular contacts between both Se and Te with the ortho substituents. In the case of 2, this is achieved by rotation of the nitro group from the arene plane. For 3, both amino groups exhibit pyramidal geometry and are involved in intramolecular N-H...Se interactions, with one also participating in intermolecular N-H...N hydrogen bonding. While 3 and 7 are structurally similar, there are some significant differences. In addition to both intramolecular N-H...Te interactions and intermolecular N-H...N hydrogen bonding, 7 also exhibits intramolecular N-H...N hydrogen bonding. In the packing of these molecules, for 2, there are weak intermolecular C-H...O contacts and these, along with the O...N interactions mentioned above, link the molecules into a three-dimensional array. For 3, in addition to the N-H...N and N-H...Se interactions, there are also weak intermolecular C-H...Se interactions, which also link the molecules into a three-dimensional array. On the other hand, 7 shows intermolecular N-H...N interactions linking the molecules into R22(16) centrosymmetric dimers. In the theoretical studies, for compound 2, AIM (atoms in molecules) analysis revealed critical points in the Se...O interactions with values of 0.017 and 0.026 a.u. These values are suggestive of weak interactions present between Se and O atoms. For 3 and 7, the molecular structures displayed intramolecular, as well as intermolecular, hydrogen-bond interactions of the N-H...N type. The strength of this hydrogen-bond interaction was calculated by AIM analysis. Here, the intermolecular (N-H...N) hydrogen bond is stronger than the intramolecular hydrogen bond. This was confirmed by the electron densities for 3 and 7 [ρ(r) = 0.015 and 0.011, respectively].
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Affiliation(s)
- Raju Saravanan
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Harkesh B Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Ray J Butcher
- Department of Chemistry, Howard University, 525 College Street NW, Washington, DC 20059, USA
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9
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Krivdin LB. Recent advances in computational liquid-phase 77Se NMR. RUSSIAN CHEMICAL REVIEWS 2021. [DOI: 10.1070/rcr4960] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
This review aims to highlight significant progress in the calculation of 77Se NMR chemical shifts and spin – spin coupling constants involving selenium substantiated with a vast amount of experimental data. The material is arranged in two basic sections: the first one dealing with the calculation of 77Se NMR chemical shifts and the second one dealing with the computation of spin – spin coupling constants involving 77Se nucleus, namely 77Se–1H, 77Se–13C and 77Se–77Se together with some more exotic types of couplings, 77Se – 15N, 77Se–19F, 77Se–29Si and 77Se–31P. A special attention is focused on the stereoelectronic effects involving selenium atom and their manifestation in the 77Se NMR spectra of organoselenium compounds studied with the aid of the modern calculation of 77Se NMR parametres in combination with experimental results.
The bibliography includes 114 references.
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10
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Tiekink ERT. Zero-, one-, two- and three-dimensional supramolecular architectures sustained by Se …O chalcogen bonding: A crystallographic survey. Coord Chem Rev 2021; 427:213586. [PMID: 33100367 PMCID: PMC7568495 DOI: 10.1016/j.ccr.2020.213586] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/15/2020] [Accepted: 09/02/2020] [Indexed: 12/20/2022]
Abstract
The Cambridge Structural Database was evaluated for crystals containing Se…O chalcogen bonding interactions. These secondary bonding interactions are found to operate independently of complementary intermolecular interactions in about 13% of the structures they can potentially form. This number rises significantly when more specific interactions are considered, e.g. Se…O(carbonyl) interactions occur in 50% of cases where they can potentially form. In about 55% of cases, the supramolecular assemblies sustained by Se…O(oxygen) interactions are one-dimensional architectures, with the next most prominent being zero-dimensional assemblies, at 30%.
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Affiliation(s)
- Edward R T Tiekink
- Research Centre for Crystalline Materials, School of Science and Technology, 5 Jalan Universiti, Sunway University, Bandar Sunway, Selangor Darul Ehsan 47500, Malaysia
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11
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Kumar M, Chhillar B, Yadav M, Sagar P, Singhal NK, Gates PJ, Butcher RJ, Singh VP. Catalytic and highly regenerable aminic organoselenium antioxidants with cytoprotective effects. Org Biomol Chem 2021; 19:2015-2022. [DOI: 10.1039/d0ob02368j] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
N-Methyl ebselenamines carrying an aminic group in very close proximity to selenium as excellent chain-breaking and glutathione peroxidase-like antioxidants could reduce the production of ROS in C6 astroglial cell lines with minimal toxic effects.
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Affiliation(s)
- Manish Kumar
- Department of Chemistry & Centre of Advanced Studies in Chemistry
- Panjab University
- Chandigarh-160 014
- India
| | - Babli Chhillar
- Department of Chemistry & Centre of Advanced Studies in Chemistry
- Panjab University
- Chandigarh-160 014
- India
| | - Manisha Yadav
- Department of Chemistry & Centre of Advanced Studies in Chemistry
- Panjab University
- Chandigarh-160 014
- India
| | - Poonam Sagar
- Department of Biotechnology
- National Agri-Food Biotechnology Institute
- Mohali 160071
- India
| | - Nitin K. Singhal
- Department of Biotechnology
- National Agri-Food Biotechnology Institute
- Mohali 160071
- India
| | | | | | - Vijay P. Singh
- Department of Chemistry & Centre of Advanced Studies in Chemistry
- Panjab University
- Chandigarh-160 014
- India
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12
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Wehrle RJ, Ste Marie EJ, Hondal RJ, Masterson DS. Synthesis of alpha-methyl selenocysteine and its utilization as a glutathione peroxidase mimic. J Pept Sci 2019; 25:e3173. [PMID: 31074180 DOI: 10.1002/psc.3173] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 03/15/2019] [Accepted: 03/22/2019] [Indexed: 12/22/2022]
Abstract
Selenocysteine (Sec) is the 21st amino acid in the genetic code where this amino acid is primarily involved in redox reactions in enzymes because of its high reactivity toward oxygen and related reactive oxygen species. Sec has found wide utility in synthetic peptides, especially as a replacement for cysteine. One limitation of using Sec in synthetic peptides is that it can undergo β-syn elimination reactions after oxidation, rendering the peptide inactive due to loss of selenium. This limitation can be overcome by substituting Cα-H with a methyl group. The resulting Sec derivative is α-methylselenocysteine ((αMe)Sec). Here, we present a new strategy for the synthesis of (αMe)Sec by alkylation of an achiral methyl malonate through the use of a selenium-containing alkylating agent synthesized in the presence of dichloromethane. The seleno-malonate was then subjected to an enzymatic hydrolysis utilizing pig liver esterase followed by a Curtius rearrangement producing a protected derivative of (αMe)Sec that could be used in solid-phase peptide synthesis. We then synthesized two peptides: one containing Sec and the other containing (αMe)Sec, based on the sequence of glutathione peroxidase. This is the first reported incorporation of (αMe)Sec into a peptide as well as the first reported biochemical application of this unique amino acid. The (αMe)Sec-containing peptide had superior stability as it could not undergo β-syn elimination and it also avoided cleavage of the peptide backbone, which we surprisingly found to be the case for the Sec-containing peptide when it was incubated for 96 hours in oxygenated buffer at pH 8.0.
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Affiliation(s)
- Robert J Wehrle
- School of Mathematics and Natural Sciences, Chemistry and Biochemistry, University of Southern Mississippi, Hattiesburg, MS
| | - Emma J Ste Marie
- Department of Biochemistry, University of Vermont, Burlington, VT
| | - Robert J Hondal
- Department of Biochemistry, University of Vermont, Burlington, VT
| | - Douglas S Masterson
- School of Mathematics and Natural Sciences, Chemistry and Biochemistry, University of Southern Mississippi, Hattiesburg, MS
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13
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Venkateshwaran K, Deka R, Raju S, Singh HB, Butcher RJ. Hypervalent organoselenium compounds stabilized by intramolecular coordination: synthesis and crystal structures. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2019; 75:70-76. [PMID: 30601134 DOI: 10.1107/s2053229618014833] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/15/2018] [Accepted: 10/19/2018] [Indexed: 11/10/2022]
Abstract
Two novel hypervalent selenium(IV) compounds stabilized by intramolecular interactions, namely 6-phenyl-6,7-dihydro-5H-2,3-dioxa-2aλ4-selenacyclopenta[hi]indene, C14H12O2Se, 14, and 5-phenyl-5,6-dihydro-4H-benzo[c][1,2]oxaselenole-7-carbaldehyde, C14H12OSe2, 15, have been synthesized by the reaction of 2-chloro-1-formyl-3-(hydroxymethylene)cyclohexene with in-situ-generated disodium diselenide (Na2Se2). The title compounds were characterized by FT-IR spectroscopy, ESI-MS, and single-crystal X-ray diffraction studies. For 14, there is whole-molecule disorder, with occupancies of 0.605 (10) and 0.395 (10), a double bond between C and Se, and the five-membered selenopentalene rings are coplanar. The packing is stabilized by π-π stacking interactions involving one of the five-membered Se/C/C/C/O rings [centroid-centroid (Cg...Cg) distance = 3.6472 (18) Å and slippage = 1.361 Å], as well as C-H...π interactions involving a C-H group and the phenyl ring. In addition, there are bifurcated C-H...Se,O interactions which link the molecules into ribbons in the c direction. For 15, the C-Se bond lengths are longer than those of 14. The two five-membered rings are coplanar. There are no π-π or C-H...π interactions; however, molecules are linked by C-H...O interactions into centrosymmetric dimers, with graph-set notation R22(16).
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Affiliation(s)
- Krishnan Venkateshwaran
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Rajesh Deka
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Saravanan Raju
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Harkesh B Singh
- Department of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400 076, India
| | - Ray J Butcher
- Department of Chemistry, Howard University, 525 College Street NW, Washington, DC 20059, USA
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14
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Venkateshwaran K, Rajesh Prasad P, Deka R, Raju S, Singh HB, Butcher RJ. Contrasting Reactivity of 2-chloro-1-formyl-3-hydroxymethylenecyclohexene and its Schiff Bases towards Disodium Diselenide: Isolation of Selenospirocycles versus Azapentalenes. ASIAN J ORG CHEM 2018. [DOI: 10.1002/ajoc.201800544] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
| | - Poonam Rajesh Prasad
- Department of Chemistry; Indian Institute of Technology Bombay, Powai; Mumbai 400 076 India
- Department of Chemistry Institute of Science; Banaras Hindu University; Varanasi 221005 India
| | - Rajesh Deka
- Department of Chemistry; Indian Institute of Technology Bombay, Powai; Mumbai 400 076 India
| | - Saravanan Raju
- Department of Chemistry; Indian Institute of Technology Bombay, Powai; Mumbai 400 076 India
| | - Harkesh B. Singh
- Department of Chemistry; Indian Institute of Technology Bombay, Powai; Mumbai 400 076 India
| | - Ray J. Butcher
- Department of Chemistry; Howard University; Washington, DC 20059 USA
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15
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Selvakumar K, Singh HB. Adaptive responses of sterically confined intramolecular chalcogen bonds. Chem Sci 2018; 9:7027-7042. [PMID: 30310623 PMCID: PMC6137456 DOI: 10.1039/c8sc01943f] [Citation(s) in RCA: 36] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/29/2018] [Accepted: 07/24/2018] [Indexed: 12/20/2022] Open
Abstract
The existence of intramolecular chalcogen bonds (IChBs) in 2,6-disubstituted arylchalcogen derivatives is determined by the substituents and the sigma hole donor behavior of the chalcogen atom in the molecule.
The responsive behavior of an entity towards its immediate surrounding is referred to as an adaptive response. The adaptive responses of a noncovalent interaction at the molecular scale are reflected from its structural and functional roles. Intramolecular chalcogen bonding (IChB), an attractive interaction between a heavy chalcogen E (E = Se or Te) centered sigma hole and an ortho-heteroatom Lewis base donor D (D = O or N), plays an adaptive role in defining the structure and reactivity of arylchalcogen compounds. In this perspective, we describe the adaptive roles of a chalcogen centered Lewis acid sigma hole and a proximal Lewis base (O or N) in accommodating built-in steric stress in 2,6-disubstituted arylchalcogen compounds. From our perspective, the IChB components (a sigma hole and the proximal Lewis base) act in synergism to accommodate the overwhelming steric force. The adaptive responses of the IChB components are inferred from the observed molecular structures and reactivity. These include (a) adaptation of a conformation without IChBs, (b) adaptation of a conformation with weak IChBs, (c) twisting the skeletal aryl ring while maintaining IChBs, (d) ionization of the E–X bond (e.g., X = Br) to relieve stress and (e) intramolecular cyclization to relieve steric stress. A comprehensive approach, involving X-ray data analysis, density functional theory (DFT) calculations, reaction pattern analysis and principal component analysis (PCA), has been employed to rationalize the adaptive behaviors of IChBs in arylchalcogen compounds. We believe that the perception of ChB as an adaptive/stimulus responsive interaction would profit the futuristic approaches that would utilise ChB as self-assembly and molecular recognition tools.
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Affiliation(s)
| | - Harkesh B Singh
- Department of Chemistry , Indian Institute of Technology Bombay , Powai-400076 , Mumbai , Maharashtra , India .
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16
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Yu SC, Ri DM, Kühn H. Hydrophobicity and glutathione peroxidase-like activity of substituted salicyloyl-5-seleninic acids: Re-investigations on aromatic selenium compounds based on their hydrophobicity. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2018.02.045] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
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17
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Sands KN, Tuck TA, Back TG. Cyclic Seleninate Esters, Spirodioxyselenuranes and Related Compounds: New Classes of Biological Antioxidants That Emulate Glutathione Peroxidase. Chemistry 2018. [DOI: 10.1002/chem.201800182] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Kai N. Sands
- Department of Chemistry; University of Calgary; 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - Tyler A. Tuck
- Department of Chemistry; University of Calgary; 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
| | - Thomas G. Back
- Department of Chemistry; University of Calgary; 2500 University Drive NW Calgary Alberta T2N 1N4 Canada
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18
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Wang H, Liu J, Wang W. Intermolecular and very strong intramolecular C–Se⋯O/N chalcogen bonds in nitrophenyl selenocyanate crystals. Phys Chem Chem Phys 2018; 20:5227-5234. [DOI: 10.1039/c7cp08215k] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Different bonding strengths of C–Se⋯O/N chalcogen bonds involved in polymorphic o-NSC (1a/1b) and monomorphic p-NSC (2) result in different thermal properties.
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Affiliation(s)
- Hui Wang
- Key Laboratory of Magnetic Molecules & Magnetic Information Materials, Ministry of Education, College of Chemistry & Material Science, Shanxi Normal University
- Linfen
- People's Republic of China
| | - Ju Liu
- Key Laboratory of Magnetic Molecules & Magnetic Information Materials, Ministry of Education, College of Chemistry & Material Science, Shanxi Normal University
- Linfen
- People's Republic of China
| | - Weizhou Wang
- College of Chemistry and Chemical Engineering, and Henan Key Laboratory of Function-Oriented Porous Materials, Luoyang Normal University
- Luoyang 471934
- People's Republic of China
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19
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20
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Barbosa NV, Nogueira CW, Nogara PA, de Bem AF, Aschner M, Rocha JBT. Organoselenium compounds as mimics of selenoproteins and thiol modifier agents. Metallomics 2017; 9:1703-1734. [PMID: 29168872 DOI: 10.1039/c7mt00083a] [Citation(s) in RCA: 91] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Abstract
Selenium is an essential trace element for animals and its role in the chemistry of life relies on a unique functional group: the selenol (-SeH) group. The selenol group participates in critical redox reactions. The antioxidant enzymes glutathione peroxidase (GPx) and thioredoxin reductase (TrxR) exemplify important selenoproteins. The selenol group shares several chemical properties with the thiol group (-SH), but it is much more reactive than the sulfur analogue. The substitution of S by Se has been exploited in organic synthesis for a long time, but in the last 4 decades the re-discovery of ebselen (2-phenyl-1,2-benzisoselenazol-3(2H)-one) and the demonstration that it has antioxidant and therapeutic properties has renovated interest in the field. The ability of ebselen to mimic the reaction catalyzed by GPx has been viewed as the most important molecular mechanism of action of this class of compound. The term GPx-like or thiol peroxidase-like reaction was previously coined in the field and it is now accepted as the most important chemical attribute of organoselenium compounds. Here, we will critically review the literature on the capacity of organoselenium compounds to mimic selenoproteins (particularly GPx) and discuss some of the bottlenecks in the field. Although the GPx-like activity of organoselenium compounds contributes to their pharmacological effects, the superestimation of the GPx-like activity has to be questioned. The ability of these compounds to oxidize the thiol groups of proteins (the thiol modifier effects of organoselenium compounds) and to spare selenoproteins from inactivation by soft-electrophiles (MeHg+, Hg2+, Cd2+, etc.) might be more relevant for the explanation of their pharmacological effects than their GPx-like activity. In our view, the exploitation of the thiol modifier properties of organoselenium compounds can be harnessed more rationally than the use of low mass molecular structures to mimic the activity of high mass macromolecules that have been shaped by millions to billions of years of evolution.
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Affiliation(s)
- Nilda V Barbosa
- Departamento de Bioquímica e Biologia Molecular, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
| | - Cristina W Nogueira
- Departamento de Bioquímica e Biologia Molecular, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
| | - Pablo A Nogara
- Departamento de Bioquímica e Biologia Molecular, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
| | - Andreza F de Bem
- Departamento de Bioquímica, Universidade Federal de Santa Catarina, Florianópolis, SC, Brazil
| | - Michael Aschner
- Department of Molecular Pharmacology, Albert Einstein College of Medicine, Bronx, New York, USA
| | - João B T Rocha
- Departamento de Bioquímica e Biologia Molecular, Centro de Ciências Naturais e Exatas, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
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Lu X, Mestres G, Singh VP, Effati P, Poon JF, Engman L, Ott MK. Selenium- and Tellurium-Based Antioxidants for Modulating Inflammation and Effects on Osteoblastic Activity. Antioxidants (Basel) 2017; 6:antiox6010013. [PMID: 28216602 PMCID: PMC5384176 DOI: 10.3390/antiox6010013] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/11/2017] [Accepted: 02/10/2017] [Indexed: 01/04/2023] Open
Abstract
Increased oxidative stress plays a significant role in the etiology of bone diseases. Heightened levels of H2O2 disrupt bone homeostasis, leading to greater bone resorption than bone formation. Organochalcogen compounds could act as free radical trapping agents or glutathione peroxidase mimetics, reducing oxidative stress in inflammatory diseases. In this report, we synthesized and screened a library of organoselenium and organotellurium compounds for hydrogen peroxide scavenging activity, using macrophagic cell lines RAW264.7 and THP-1, as well as human mono- and poly-nuclear cells. These cells were stimulated to release H2O2, using phorbol 12-myristate 13-acetate, with and without organochalogens. Released H2O2 was then measured using a chemiluminescent assay over a period of 2 h. The screening identified an organoselenium compound which scavenged H2O2 more effectively than the vitamin E analog, Trolox. We also found that this organoselenium compound protected MC3T3 cells against H2O2-induced toxicity, whereas Trolox did not. The organoselenium compound exhibited no cytotoxicity to the cells and had no deleterious effects on cell proliferation, viability, or alkaline phosphatase activity. The rapidity of H2O2 scavenging and protection suggests that the mechanism of protection is due to the direct scavenging of extracellular H2O2. This compound is a promising modulators of inflammation and could potentially treat diseases involving high levels of oxidative stress.
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Affiliation(s)
- Xi Lu
- Department of Engineering Science, Applied Materials Science, Uppsala University, Box 534, Uppsala 751 21, Sweden.
| | - Gemma Mestres
- Department of Engineering, Microsystems Technology, Uppsala University, Box 534, Uppsala 751 21, Sweden.
| | - Vijay Pal Singh
- Department of Chemistry, BMC, Uppsala University, Box 576, Uppsala 751 23, Sweden.
| | - Pedram Effati
- Department of Engineering Science, Applied Materials Science, Uppsala University, Box 534, Uppsala 751 21, Sweden.
| | - Jia-Fei Poon
- Department of Chemistry, BMC, Uppsala University, Box 576, Uppsala 751 23, Sweden.
| | - Lars Engman
- Department of Chemistry, BMC, Uppsala University, Box 576, Uppsala 751 23, Sweden.
| | - Marjam Karlsson Ott
- Department of Engineering Science, Applied Materials Science, Uppsala University, Box 534, Uppsala 751 21, Sweden.
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22
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Singh VP, Poon JF, Yan J, Lu X, Ott MK, Butcher RJ, Gates PJ, Engman L. Nitro-, Azo-, and Amino Derivatives of Ebselen: Synthesis, Structure, and Cytoprotective Effects. J Org Chem 2016; 82:313-321. [PMID: 27997177 DOI: 10.1021/acs.joc.6b02418] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Abstract
Novel azo-bis-ebselen compounds 7 were prepared by reduction of 7-nitro-2-aryl-1,2-benzisoselenazol-3(2H)-ones 3 and 6 with sodium benzenetellurolate, NaTeC6H5, and by reaction of 2-bromo-3-nitrobenzamides with Na2Se2. The X-ray structure of 7b showed that the molecule, due to strong intramolecular secondary Se···N interactions, is completely planar. Azo-compounds 7 upon further reaction with NaTeC6H5 were reductively cleaved to provide 2 equiv of the corresponding aromatic amine. The weak Se-N bond was not stable enough to survive the reaction conditions, and diselenides 8 were isolated after workup. Whereas azo-bis-ebselens 7 were poor mimics of the glutathione peroxidase (GPx)-enzymes, nitroebselens 3, 6, and 11b and diselenides 8 were 3-6-fold more active than ebselen. Based on 77Se NMR spectroscopy, a catalytic cycle for diselenide 8b, involving aminoebselen 14, was proposed. As assessed by chemiluminescence measurements, the good GPx-mimics could reduce production of reactive oxygen species (ROS) in stimulated human mononuclear cells more efficiently than Trolox. No toxic effects of the compounds were seen in MC3T3-cells at 25 μM.
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Affiliation(s)
- Vijay P Singh
- Department of Chemistry-BMC, Uppsala University , Box 576, SE-751 23 Uppsala, Sweden
| | - Jia-Fei Poon
- Department of Chemistry-BMC, Uppsala University , Box 576, SE-751 23 Uppsala, Sweden
| | - Jiajie Yan
- Department of Chemistry-BMC, Uppsala University , Box 576, SE-751 23 Uppsala, Sweden
| | - Xi Lu
- Division of Applied Materials Science, Department of Engineering Sciences, Uppsala University , Uppsala, Sweden
| | - Marjam Karlsson Ott
- Division of Applied Materials Science, Department of Engineering Sciences, Uppsala University , Uppsala, Sweden
| | - Ray J Butcher
- Department of Chemistry, Howard University , Washington, D.C. 20059, United States
| | - Paul J Gates
- University of Bristol , School of Chemistry, Bristol, BS8 1TS, United Kingdom
| | - Lars Engman
- Department of Chemistry-BMC, Uppsala University , Box 576, SE-751 23 Uppsala, Sweden
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23
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McNeil NMR, Press DJ, Mayder DM, Garnica P, Doyle LM, Back TG. Enhanced Glutathione Peroxidase Activity of Water-Soluble and Polyethylene Glycol-Supported Selenides, Related Spirodioxyselenuranes, and Pincer Selenuranes. J Org Chem 2016; 81:7884-97. [DOI: 10.1021/acs.joc.6b01593] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Nicole M. R. McNeil
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - David J. Press
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - Don M. Mayder
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - Pablo Garnica
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - Lisa M. Doyle
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
| | - Thomas G. Back
- Department of Chemistry, University of Calgary, 2500 University Drive N.W., Calgary, Alberta T2N 1N4, Canada
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24
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Bhowmick D, Mugesh G. Insights into the catalytic mechanism of synthetic glutathione peroxidase mimetics. Org Biomol Chem 2016; 13:10262-72. [PMID: 26372527 DOI: 10.1039/c5ob01665g] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
Glutathione Peroxidase (GPx) is a key selenoenzyme that protects biomolecules from oxidative damage. Extensive research has been carried out to design and synthesize small organoselenium compounds as functional mimics of GPx. While the catalytic mechanism of the native enzyme itself is poorly understood, the synthetic mimics follow different catalytic pathways depending upon the structures and reactivities of various intermediates formed in the catalytic cycle. The steric as well as electronic environments around the selenium atom not only modulate the reactivity of these synthetic mimics towards peroxides and thiols, but also the catalytic mechanisms. The catalytic cycle of small GPx mimics is also dependent on the nature of peroxides and thiols used in the study. In this review, we discuss how the catalytic mechanism varies with the substituents attached to the selenium atom.
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Affiliation(s)
- Debasish Bhowmick
- Department of Inorganic and Physical Chemistry, Indian Institute of Science, Bangalore 560 012, India.
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25
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Prasad PR, Singh HB, Butcher RJ. Synthesis, structure and reactivity of β-chalcocyclohexenals: Dichalcogenides and chalcogenides. J Organomet Chem 2016. [DOI: 10.1016/j.jorganchem.2016.04.019] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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26
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Prasad PR, Selvakumar K, Singh HB, Butcher RJ. Synthesis, Structure, and Bonding of 1-Oxa-6,6aλ4- chalcogenopentalenes and Related Derivatives; The Role of Intramolecular Coordination. J Org Chem 2016; 81:3214-26. [DOI: 10.1021/acs.joc.6b00173] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Poonam Rajesh Prasad
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | | | - Harkesh B. Singh
- Department
of Chemistry, Indian Institute of Technology Bombay, Powai, Mumbai 400076, India
| | - Ray J. Butcher
- Department
of Chemistry, Howard University, Washington, DC 20059, United States
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27
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Press DJ, Back TG. The role of methoxy substituents in regulating the activity of selenides that serve as spirodioxyselenurane precursors and glutathione peroxidase mimetics. CAN J CHEM 2016. [DOI: 10.1139/cjc-2015-0329] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
A series of o-(hydroxymethyl)phenyl selenides containing single or multiple methoxy substituents was synthesized, and the rate at which each compound catalyzed the oxidation of benzyl thiol to its disulfide with excess hydrogen peroxide was measured. This assay provided the means for comparing the relative abilities of the selenides to mimic the antioxidant selenoenzyme glutathione peroxidase. The mechanism for catalytic activity involves oxidation of the selenides to their corresponding selenoxides with hydrogen peroxide, cyclization to spirodioxyselenuranes, followed by reduction with two equivalents of thiol to regenerate the original selenide with concomitant disulfide formation. A single p-methoxy group on each aryl moiety afforded the highest catalytic activity, while methoxy groups in the meta position had little effect compared to the unsubstituted selenide, and o-methoxy groups suppressed activity. The installation of multiple methoxy groups on each aryl moiety provided no improvement. These results can be rationalized on the basis of dominating mesomeric and steric effects of the p- and o-substituents, respectively.
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Affiliation(s)
- David J. Press
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
| | - Thomas G. Back
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
- Department of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, AB T2N 1N4, Canada
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28
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Caracelli I, Zukerman-Schpector J, Haiduc I, Tiekink ERT. Main group metal lone-pair⋯π(arene) interactions: a new bonding mode for supramolecular associations. CrystEngComm 2016. [DOI: 10.1039/c6ce01460g] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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29
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Singh VP, Poon JF, Butcher RJ, Lu X, Mestres G, Ott MK, Engman L. Effect of a Bromo Substituent on the Glutathione Peroxidase Activity of a Pyridoxine-like Diselenide. J Org Chem 2015; 80:7385-95. [DOI: 10.1021/acs.joc.5b00797] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Vijay P. Singh
- Department
of Chemistry−BMC, Uppsala University, Box 576, SE-751 23 Uppsala, Sweden
| | - Jia-fei Poon
- Department
of Chemistry−BMC, Uppsala University, Box 576, SE-751 23 Uppsala, Sweden
| | - Ray J. Butcher
- Department
of Chemistry, Howard University, Washington, D.C. 20059, United States
| | - Xi Lu
- Division
of Applied Materials Science, Department of Engineering Sciences, Uppsala University, SE-751 23 Uppsala, Sweden
| | - Gemma Mestres
- Division
of Applied Materials Science, Department of Engineering Sciences, Uppsala University, SE-751 23 Uppsala, Sweden
| | - Marjam Karlsson Ott
- Division
of Applied Materials Science, Department of Engineering Sciences, Uppsala University, SE-751 23 Uppsala, Sweden
| | - Lars Engman
- Department
of Chemistry−BMC, Uppsala University, Box 576, SE-751 23 Uppsala, Sweden
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30
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McNeil NMR, McDonnell C, Hambrook M, Back TG. Oxidation of Disulfides to Thiolsulfinates with Hydrogen Peroxide and a Cyclic Seleninate Ester Catalyst. Molecules 2015; 20:10748-62. [PMID: 26111166 PMCID: PMC6272456 DOI: 10.3390/molecules200610748] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/24/2015] [Revised: 06/03/2015] [Accepted: 06/04/2015] [Indexed: 11/24/2022] Open
Abstract
Cyclic seleninate esters function as mimetics of the antioxidant selenoenzyme glutathione peroxidase. They catalyze the reduction of harmful peroxides with thiols, which are converted to disulfides in the process. The possibility that the seleninate esters could also catalyze the further oxidation of disulfides to thiolsulfinates and other overoxidation products under these conditions was investigated. This has ramifications in potential medicinal applications of seleninate esters because of the possibility of catalyzing the unwanted oxidation of disulfide-containing spectator peptides and proteins. A variety of aryl and alkyl disulfides underwent facile oxidation with hydrogen peroxide in the presence of catalytic benzo-1,2-oxaselenolane Se-oxide affording the corresponding thiolsulfinates as the principal products. Unsymmetrical disulfides typically afforded mixtures of regioisomers. Lipoic acid and N,N′-dibenzoylcystine dimethyl ester were oxidized readily under similar conditions. Although isolated yields of the product thiolsulfinates were generally modest, these experiments demonstrate that the method nevertheless has preparative value because of its mild conditions. The results also confirm the possibility that cyclic seleninate esters could catalyze the further undesired oxidation of disulfides in vivo.
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Affiliation(s)
- Nicole M R McNeil
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada.
| | - Ciara McDonnell
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada.
| | - Miranda Hambrook
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada.
| | - Thomas G Back
- Department of Chemistry, University of Calgary, Calgary, AB T2N 1N4, Canada.
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31
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Press DJ, McNeil NMR, Hambrook M, Back TG. Effects of Methoxy Substituents on the Glutathione Peroxidase-like Activity of Cyclic Seleninate Esters. J Org Chem 2014; 79:9394-401. [DOI: 10.1021/jo501689h] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- David J. Press
- Department
of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
| | - Nicole M. R. McNeil
- Department
of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
| | - Miranda Hambrook
- Department
of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
| | - Thomas G. Back
- Department
of Chemistry, University of Calgary, 2500 University Drive NW, Calgary, Alberta, Canada T2N 1N4
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Singh VP, Poon JF, Butcher RJ, Engman L. Pyridoxine-Derived Organoselenium Compounds with Glutathione Peroxidase-Like and Chain-Breaking Antioxidant Activity. Chemistry 2014; 20:12563-71. [DOI: 10.1002/chem.201403229] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2014] [Indexed: 11/07/2022]
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Balkrishna SJ, Kumar S, Azad GK, Bhakuni BS, Panini P, Ahalawat N, Tomar RS, Detty MR, Kumar S. An ebselen like catalyst with enhanced GPx activity via a selenol intermediate. Org Biomol Chem 2014; 12:1215-9. [DOI: 10.1039/c4ob00027g] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Benzamide ring-substituted, quinine-derived ebselen analogue is synthesized which exists in selenol form upon addition of PhSH. It catalyses oxidation of PhSH with H2O2 faster (103-fold) than ebselen.
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Affiliation(s)
- Shah Jaimin Balkrishna
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal (IISER)
- Bhopal, India
| | - Shailesh Kumar
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal (IISER)
- Bhopal, India
| | - Gajendra Kumar Azad
- Department of Biological Sciences
- Indian Institute of Science Education and Research Bhopal (IISER)
- Bhopal, India
| | - Bhagat Singh Bhakuni
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal (IISER)
- Bhopal, India
| | - Piyush Panini
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal (IISER)
- Bhopal, India
| | - Navjeet Ahalawat
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal (IISER)
- Bhopal, India
| | - Raghuvir Singh Tomar
- Department of Biological Sciences
- Indian Institute of Science Education and Research Bhopal (IISER)
- Bhopal, India
| | - Michael R. Detty
- Department of Chemistry
- University at Buffalo
- The State University of New York
- , USA
| | - Sangit Kumar
- Department of Chemistry
- Indian Institute of Science Education and Research Bhopal (IISER)
- Bhopal, India
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McNeil NMR, Matz MC, Back TG. Fluxional Cyclic Seleninate Ester: NMR and Computational Studies, Glutathione Peroxidase-like Behavior, and Unexpected Rearrangement. J Org Chem 2013; 78:10369-82. [DOI: 10.1021/jo401757m] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Affiliation(s)
- Nicole M. R. McNeil
- Department of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4
| | - Marie C. Matz
- Department of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4
| | - Thomas G. Back
- Department of Chemistry, University of Calgary, Calgary, Alberta, Canada T2N 1N4
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Bayse CA, Ortwine KN. Modeling the Glutathione Peroxidase-Like Activity of a Cyclic Seleninate by DFT and Solvent-Assisted Proton Exchange. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201300279] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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Troff RW, Mäkelä T, Topić F, Valkonen A, Raatikainen K, Rissanen K. Alternative Motifs for Halogen Bonding. European J Org Chem 2013. [DOI: 10.1002/ejoc.201201512] [Citation(s) in RCA: 190] [Impact Index Per Article: 17.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Singh VP, Singh P, Singh HB, Butcher RJ. Intramolecular C–C coupling of 2,6-disubstituted-1-bromoaryls for dihydrophenanthridines. Tetrahedron Lett 2012. [DOI: 10.1016/j.tetlet.2012.06.087] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Selvakumar K, Singh HB, Butcher RJ. Strained dimethyl 2-(bromoselanyl)-5-tert-butylisophthalate: a reactive precursor for the synthesis of ebselen analogs. Tetrahedron Lett 2011. [DOI: 10.1016/j.tetlet.2011.10.067] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/16/2022]
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Antony S, Bayse CA. Modeling the Mechanism of the Glutathione Peroxidase Mimic Ebselen. Inorg Chem 2011; 50:12075-84. [DOI: 10.1021/ic201603v] [Citation(s) in RCA: 72] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Affiliation(s)
- Sonia Antony
- Department of Chemistry and Biochemistry, Old Dominion University, Hampton Boulevard, Norfolk, Virginia 23529, United States
| | - Craig A. Bayse
- Department of Chemistry and Biochemistry, Old Dominion University, Hampton Boulevard, Norfolk, Virginia 23529, United States
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Singh VP, Singh HB, Butcher RJ. Photoluminescent selenospirocyclic and selenotetracyclic derivatives by domino reactions of amines and imines. Chem Commun (Camb) 2011; 47:7221-3. [DOI: 10.1039/c1cc12152a] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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