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Chhillar B, Kadian R, Kumar M, Yadav M, Sodhi N, Xavier da Silva TN, Friedmann Angeli JP, Singh VP. Aminic Organoselenium Compounds as Glutathione Peroxidase Mimics and Inhibitors of Ferroptosis. Chembiochem 2024; 25:e202400074. [PMID: 38293899 DOI: 10.1002/cbic.202400074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 12/03/2023] [Accepted: 01/29/2024] [Indexed: 02/01/2024]
Abstract
The synthesis of diarylamine-based organoselenium compounds via the nucleophilic substitution reactions has been described. Symmetrical monoselenides and diselenides were conveniently synthesized by the reduction of their corresponding selenocyanates using sodium borohydride. Selenocyanates were obtained from 2-chloro acetamides by the nucleophilic displacement with potassium selenocyanate. Selenides were synthesized by treating the 2-chloro acetamides with in situ generated sodium butyl selenolate as nucleophile. Further, the newly synthesized organoselenium compounds were evaluated for their glutathione peroxidase (GPx)-like activity in thiophenol assay. This study revealed that the methoxy-substituted organoselenium compounds showed significant effect on the GPx-like activity. The catalytic parameters for the most efficient catalysts were also determined. The anti-ferroptotic activity for all GPx-mimics evaluated in a 4-OH-tamoxifen (TAM) inducible GPx4 knockout cell line using liproxstatin as standard.
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Affiliation(s)
- Babli Chhillar
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Sector-14, Chandigarh, 160 014, India
| | - Rajni Kadian
- 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
| | - Manisha Yadav
- 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
| | - Thamara Nishida Xavier da Silva
- Rudolf Virchow Zentrum, Centre for Integrative and Translational Bioimaging, Julius-Maximillian, University of Wurzburg, 97080, Wurzburg, Germany
| | - Jose Pedro Friedmann Angeli
- Rudolf Virchow Zentrum, Centre for Integrative and Translational Bioimaging, Julius-Maximillian, University of Wurzburg, 97080, Wurzburg, Germany
| | - 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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Kumar M, Sharma D, Singh VP. Modulation of the chain-breaking antioxidant activity of phenolic organochalcogens with various co-antioxidants at various pH values. Org Biomol Chem 2023; 21:1316-1327. [PMID: 36648399 DOI: 10.1039/d2ob01988d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Phenolic organochalcogen chain-breaking antioxidants, i.e. 6-bromo-8 (hexadecyltellanyl)-3,3-dimethyl-1,5-dihydro-[1,3]dioxepino[5,6-c]pyridin-9-ol and 2-methyl-2,3-dihydrobenzo[b]selenophene-5-ol, have been investigated in a two-phase (chlorobenzene/water) lipid peroxidation model system as potent inhibitors of lipid peroxyl radicals with various co-antioxidants at various pH values. The pH has a significant effect on the chain-breaking antioxidant activities of phenolic organochalcogens. The key chain-breaking mechanism profile was attributed to the first oxygen atom transfer from the lipid peroxyl radicals to the Se/Te atom, followed by hydrogen atom transfer in a solvent cage from the nearby phenolic group to the resulting alkoxyl radical. Finally, regeneration of organochalcogen antioxidants could take place in the presence of aqueous-soluble co-antioxidants. Also, in the presence of aqueous soluble N-acetylcysteine at pH 1-7, both antioxidants behaved as very good inhibitors of lipid peroxyl radicals. The role of aqueous soluble mild co-antioxidants in the regeneration studies of organochalcogen antioxidants has been investigated in a two-phase lipid peroxidation model system. The importance of the phase transfer catalyst has been explored in the inhibition studies of selenium containing antioxidants using an Fe(II) source. The overall pH-dependent antioxidant activities of organochalcogens depend on their hydrogen atom transfer ability, relative stability, and distribution in the aqueous/lipid phase.
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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.
| | - Deepika Sharma
- 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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3
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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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4
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Upadhyay A, Kumar Jha R, Batabyal M, Dutta T, Koner AL, Kumar S. Janus -faced oxidant and antioxidant profiles of organo diselenides. Dalton Trans 2021; 50:14576-14594. [PMID: 34590653 DOI: 10.1039/d1dt01565f] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
To date, organoseleniums are pre-eminent for peroxide decomposition and radical quenching antioxidant activities. On the contrary, here, a series of Janus-faced aminophenolic diselenides have been prepared from substituted 2-iodoaniline and selenium powder using copper-catalyzed methodology. Subsequently, condensation with substituted salicylaldehyde afforded the Schiff base, which on reduction, yielded the desired substituted aminophenolic diselenides in 72%-88% yields. The generation of reactive oxygen species (ROS) from oxygen gas by the synthesized aminophenolic diselenides was studied by analyzing the oxidation of dichlorofluorescein diacetate (DCFDA) dye and para-nitro-thiophenol by fluorescence and UV-Visible spectroscopic methods. Furthermore, density functional theory calculations and crystal structure analysis revealed the role of functional amine and hydroxyl sites present in the Janus-faced organoselenium catalyst for the activation of molecular oxygen, where NH and phenolic groups bring the oxygen molecule close to the catalyst by N-H⋯O and O-H⋯O intermolecular interactions. Additionally, these functionalities stabilize the selenium-centered radical in the formed transition states. Antioxidant activities of the synthesized diselenides have been explored as the catalyst for the decomposition of hydrogen peroxide using benzenethiol sacrificial co-reductant by a well-established thiol assay. Radical quenching antioxidant activity was studied by the quenching of DPPH radicals at 516 nm by UV-Visible spectroscopy. The structure activity correlation suggests that the electron-rich phenol and electron-rich and sterically hindered selenium center enhance the oxidizing property of the aminophenolic diselenides. Janus-faced diselenides were also evaluated for their cytotoxic effect on HeLa cancer cells via MTT assay, which suggests that the compounds are effective at 15-18 μM concentration against cancer cells. Moreover, the combination with therapeutic anticancer drugs Erlotinib and Doxorubicin showed promising cytotoxicity at the nanomolar concentration (8-28 nM), which is sufficient to suppress the growth of the cancer cells.
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Affiliation(s)
- Aditya Upadhyay
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal Bhauri By-pass Road, Bhopal 462066, Madhya Pradesh, India.
| | - Raushan Kumar Jha
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal Bhauri By-pass Road, Bhopal 462066, Madhya Pradesh, India.
| | - Monojit Batabyal
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal Bhauri By-pass Road, Bhopal 462066, Madhya Pradesh, India.
| | - Tanoy Dutta
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal Bhauri By-pass Road, Bhopal 462066, Madhya Pradesh, India.
| | - Apurba Lal Koner
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal Bhauri By-pass Road, Bhopal 462066, Madhya Pradesh, India.
| | - Sangit Kumar
- Department of Chemistry, Indian Institute of Science Education and Research, Bhopal Bhauri By-pass Road, Bhopal 462066, Madhya Pradesh, India.
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5
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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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6
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Yu S, Wang Y, Wang S, Zhu J, Liu S. The Antioxidant Activity and Catalytic Mechanism of Schiff Base Diphenylamines at Elevated Temperatures. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.9b05321] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Shasha Yu
- Polymers and composites division, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
| | - Yishan Wang
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, China
| | - Shengpei Wang
- Polymers and composites division, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jia Zhu
- College of Chemistry, Key Laboratory of Theoretical & Computational Photochemistry of Ministry of Education, Beijing Normal University, Beijing 100875, China
| | - Shenggao Liu
- Polymers and composites division, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo 315201, China
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7
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Sattar M, Patidar K, Thorat RA, Kumar S. Copper-Mediated Selective Mono- and Sequential Organochalcogenation of C–H Bonds: Synthesis of Hybrid Unsymmetrical Aryl Ferrocene Chalcogenides. J Org Chem 2019; 84:6669-6678. [DOI: 10.1021/acs.joc.9b00311] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Moh. Sattar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, Madhya Pradesh 462066, India
| | - Krishna Patidar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, Madhya Pradesh 462066, India
| | - Raviraj Ananda Thorat
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, Madhya Pradesh 462066, India
| | - Sangit Kumar
- Department of Chemistry, Indian Institute of Science Education and Research Bhopal, Bhopal Bypass Road, Bhauri, Bhopal, Madhya Pradesh 462066, India
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8
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Kadu R, Batabyal M, Kadyan H, Koner AL, Kumar S. An efficient copper-catalyzed synthesis of symmetrical bis(N-arylbenzamide) selenides and their conversion to hypervalent spirodiazaselenuranes and hydroxy congeners. Dalton Trans 2019; 48:7249-7260. [PMID: 30747185 DOI: 10.1039/c8dt04832k] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
A copper catalyzed efficient synthetic method has been developed to access bis(N-arylbenzamide) selenides from 2-halo-N-arylbenzamide substrates and disodium selenide in HMPA at 110 °C. The developed protocol tolerates substituents in both N-aryl and benzamide rings of the 2-halobenzamide substrates and provides an array of bis(N-arylbenzamide) selenides in practical yields. The resulting selenides were transformed into hypervalent spirodiazaselenuranes by oxidation using aqueous hydrogen peroxide. (N-(1-Naphthyl)) spirodiazaselenurane is also structurally characterized by a single crystal X-ray study. Hydroxy-substituted spiroselenuranes have been prepared by careful demethylation of methoxy-substituted selenides followed by oxidation by hydrogen peroxide. Antioxidant properties for the decomposition of hydrogen peroxide and for the deactivation of radicals of hydroxy-substituted spiroselenuranes have been studied by the thiol assay and 2,2-diphenyl-1-picrylhydrazyl (DPPH) assay. Both hydroxy-substituted spiroselenuranes exhibit dual mimic functions of glutathione peroxidase (GPx) selenoenzyme and α-tocopherol for decomposition of hydrogen peroxide and deactivation of radicals, respectively.
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Affiliation(s)
- Rahul Kadu
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Bhopal, Bhopal By-pass Road, Bhauri, Bhopal-462066, India.
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9
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Electrochemical transformations and antiradical activity of asymmetrical RS-substituted pyrocatechols. Russ Chem Bull 2018. [DOI: 10.1007/s11172-018-2299-9] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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10
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Angeli A, Trallori E, Carta F, Di Cesare Mannelli L, Ghelardini C, Supuran CT. Heterocoumarins Are Selective Carbonic Anhydrase IX and XII Inhibitors with Cytotoxic Effects against Cancer Cells Lines. ACS Med Chem Lett 2018; 9:947-951. [PMID: 30258546 DOI: 10.1021/acsmedchemlett.8b00362] [Citation(s) in RCA: 34] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2018] [Accepted: 08/29/2018] [Indexed: 12/19/2022] Open
Abstract
We have synthesized a new series of coumarin-based compounds demonstrating high selectivity and potent effects with low nanomolar affinity against the tumor associated carbonic anhydrase (CA, EC 4.2.1.1) isoforms hCA IX and XII. A number of these compounds were evaluated ex vivo against human prostate (PC3) and breast (MDA-MB-231) cancer cell lines. Compounds 4b and 15 revealed effective cytotoxic effects after 48 h of incubation in both normoxic and hypoxic conditions with PC3 cancer cell line. However, compound 3 showed selective cytotoxic effects against MDA-MB-231 in hypoxic condition. These results may be of particular importance for the choice of future drug candidates targeting hypoxic tumors and metastases, considering the fact that a selective carbonic anhydrase CA IX inhibitor (SLC-0111) is presently in phase II clinical trials.
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Affiliation(s)
- Andrea Angeli
- University of Florence, NEUROFARBA Dept., Sezione di Scienze Farmaceutiche, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Florence, Italy
| | - Elena Trallori
- NEUROFARBA Department, Section of Pharmacology and Toxicology, Università degli Studi di Firenze, Viale Pieraccini 6, 50139 Florence, Italy
| | - Fabrizio Carta
- University of Florence, NEUROFARBA Dept., Sezione di Scienze Farmaceutiche, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Florence, Italy
| | - Lorenzo Di Cesare Mannelli
- NEUROFARBA Department, Section of Pharmacology and Toxicology, Università degli Studi di Firenze, Viale Pieraccini 6, 50139 Florence, Italy
| | - Carla Ghelardini
- NEUROFARBA Department, Section of Pharmacology and Toxicology, Università degli Studi di Firenze, Viale Pieraccini 6, 50139 Florence, Italy
| | - Claudiu T. Supuran
- University of Florence, NEUROFARBA Dept., Sezione di Scienze Farmaceutiche, Via Ugo Schiff 6, 50019 Sesto Fiorentino, Florence, Italy
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11
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Bao X, Yao J, Zhou H, Xu G. Nucleophilic Functionalizations of Aniline Derivatives: Aromatic Pummerer Reaction for Umpolung Halogenation and Hydroxylation on Benzene Ring. Org Lett 2018; 19:5780-5782. [PMID: 29064251 DOI: 10.1021/acs.orglett.7b02720] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
In this paper, a metal-free protocol of nucleophilic ortho-halogenation and hydroxylation of anilines via an aromatic Pummerer process is reported.
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Affiliation(s)
- Xingping Bao
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University , Changsha 410081, People's Republic of China.,College of Biological, Chemical Sciences and Engineering, Jiaxing University , Jiaxing 314001, People's Republic of China
| | - Jinzhong Yao
- College of Biological, Chemical Sciences and Engineering, Jiaxing University , Jiaxing 314001, People's Republic of China
| | - Hongwei Zhou
- College of Biological, Chemical Sciences and Engineering, Jiaxing University , Jiaxing 314001, People's Republic of China
| | - Guangyu Xu
- Key Laboratory of Chemical Biology and Traditional Chinese Medicine Research (Ministry of Education), College of Chemistry and Chemical Engineering, Hunan Normal University , Changsha 410081, People's Republic of China
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12
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Ritschel B, Poater J, Dengel H, Bickelhaupt FM, Lichtenberg C. Doppelte CH-Aktivierung eines maskierten Bismutamid-Kations. Angew Chem Int Ed Engl 2018. [DOI: 10.1002/ange.201712725] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Benedikt Ritschel
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - Jordi Poater
- ICREA; Pg. Lluís Companys 23 08010 Barcelona Spanien
- Universitat de Barcelona; Departament de Química Inorgànica i Orgànica & IQTCUB; Martí i Franquès 1-11 08028 Barcelona Katalonien Spanien
| | - Hannah Dengel
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
| | - F. Matthias Bickelhaupt
- Department of Theoretical Chemistry, Amsterdam Center for Multiscale Modelling (ACMM); Vrije Universiteit Amsterdam; De Boelelaan 1083 1081 HV Amsterdam Niederlande
- Radboud University; Institute for Molecules and Materials; Heyendaalseweg 135 6525 AJ Nijmegen Niederlande
| | - Crispin Lichtenberg
- Institut für Anorganische Chemie; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Deutschland
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13
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Ritschel B, Poater J, Dengel H, Bickelhaupt FM, Lichtenberg C. Double CH Activation of a Masked Cationic Bismuth Amide. Angew Chem Int Ed Engl 2018; 57:3825-3829. [DOI: 10.1002/anie.201712725] [Citation(s) in RCA: 45] [Impact Index Per Article: 7.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/11/2017] [Revised: 01/17/2018] [Indexed: 11/10/2022]
Affiliation(s)
- Benedikt Ritschel
- Department of Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - Jordi Poater
- ICREA; Pg. Lluís Companys 23 08010 Barcelona Spain
- Universitat de Barcelona; Departament de Química Inorgànica i Orgànica & IQTCUB; Martí i Franquès 1-11 08028 Barcelona Catalonia Spain
| | - Hannah Dengel
- Department of Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
| | - F. Matthias Bickelhaupt
- Department of Theoretical Chemistry, Amsterdam Center for Multiscale Modelling (ACMM); Vrije Universiteit Amsterdam; De Boelelaan 1083 1081 HV Amsterdam The Netherlands
- Radboud University; Institute for Molecules and Materials; Heyendaalseweg 135 6525 AJ Nijmegen The Netherlands
| | - Crispin Lichtenberg
- Department of Inorganic Chemistry; Julius-Maximilians-Universität Würzburg; Am Hubland 97074 Würzburg Germany
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14
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Poon JF, Yan J, Jorner K, Ottosson H, Donau C, Singh VP, Gates PJ, Engman L. Substituent Effects in Chain-Breaking Aryltellurophenol Antioxidants. Chemistry 2018; 24:3520-3527. [DOI: 10.1002/chem.201704811] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/11/2017] [Indexed: 12/28/2022]
Affiliation(s)
- Jia-fei Poon
- Department of Chemistry, Biomedicinskt Centrum (BMC); Uppsala University, Box-576; 751 23 Uppsala Sweden
| | - Jiajie Yan
- Department of Chemistry, Biomedicinskt Centrum (BMC); Uppsala University, Box-576; 751 23 Uppsala Sweden
| | - Kjell Jorner
- Department of Chemistry, Ångström Laboratory; Uppsala University, Box-523; 751 20 Uppsala Sweden
| | - Henrik Ottosson
- Department of Chemistry, Ångström Laboratory; Uppsala University, Box-523; 751 20 Uppsala Sweden
| | - Carsten Donau
- Department of Chemistry, Biomedicinskt Centrum (BMC); Uppsala University, Box-576; 751 23 Uppsala Sweden
| | - Vijay P. Singh
- Department of Chemistry & Centre of Advanced Studies in Chemistry; Panjab University; Chandigarh 160 014 India
| | - Paul J. Gates
- School of Chemistry; University of Bristol; Bristol BS8 1TS UK
| | - Lars Engman
- Department of Chemistry, Biomedicinskt Centrum (BMC); Uppsala University, Box-576; 751 23 Uppsala Sweden
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15
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Yu S, Liu S. Multifunctional Antioxidants with High Activity at Elevated Temperatures Based on Intramolecular Synergism. European J Org Chem 2018. [DOI: 10.1002/ejoc.201701577] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Affiliation(s)
- Shasha Yu
- Polymers and Composites Division; Ningbo Institute of Materials Technology and Engineering; Chinese Academy of Sciences; No. 1219 Zhongguan West Road 315201 Ningbo China
| | - Shenggao Liu
- Polymers and Composites Division; Ningbo Institute of Materials Technology and Engineering; Chinese Academy of Sciences; No. 1219 Zhongguan West Road 315201 Ningbo China
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16
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Singh VP, Yan J, Poon JF, Gates PJ, Butcher RJ, Engman L. Chain-Breaking Phenolic 2,3-Dihydrobenzo[b]selenophene Antioxidants: Proximity Effects and Regeneration Studies. Chemistry 2017; 23:15080-15088. [PMID: 28857289 DOI: 10.1002/chem.201702350] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2017] [Indexed: 11/07/2022]
Abstract
Phenolic 2,3-dihydrobenzo[b]selenophene antioxidants bearing an OH-group ortho (9), meta (10, 11) and para (8) to the Se were prepared by seleno-Claisen rearrangement/intramolecular hydroselenation. meta-Isomer (11) was studied by X-ray crystallography. The radical-trapping activity and regenerability of compounds 8-11 were evaluated using a two-phase system in which linoleic acid was undergoing peroxidation in the lipid phase while regeneration of the antioxidant by co-antioxidants (N-acetylcysteine, glutathione, dithiothreitol, ascorbic acid, tris(carboxyethyl)phosphine hydrochloride) was ongoing in the aqueous layer. Compound 9 quenched peroxyl radicals more efficiently than α-tocopherol. It also provided the most long-lasting antioxidant protection. With thiol co-antioxidants it could inhibit peroxidation for more than five-fold longer than the natural product. Regeneration was more efficient when the aqueous phase pH was slightly acidic. Since calculated O-H bond dissociation energies for 8-11 were substantially larger than for α-tocopherol, an antioxidant mechanism involving O-atom transfer from peroxyl to selenium was proposed. The resulting phenolic selenoxide/alkoxyl radical would then exchange a hydrogen atom in a solvent cage before antioxidant regeneration at the aqueous lipid interphase.
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Affiliation(s)
- Vijay P Singh
- Department of Chemistry & Centre of Advanced Studies in Chemistry, Panjab University, Chandigarh -, 160 014, India
- Department of Chemistry-BMC, Uppsala University, Box-576, 751 23, Uppsala, Sweden
| | - Jiajie Yan
- Department of Chemistry-BMC, Uppsala University, Box-576, 751 23, Uppsala, Sweden
| | - Jia-Fei Poon
- Department of Chemistry-BMC, Uppsala University, Box-576, 751 23, Uppsala, Sweden
| | | | - Ray J Butcher
- Department of Chemistry, Howard University, Washington, DC, 20059, USA
| | - Lars Engman
- Department of Chemistry-BMC, Uppsala University, Box-576, 751 23, Uppsala, Sweden
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17
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Poon JF, Yan J, Singh VP, Gates PJ, Engman L. Regenerable Radical-Trapping Tellurobistocopherol Antioxidants. J Org Chem 2016; 81:12540-12544. [DOI: 10.1021/acs.joc.6b02450] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- 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
| | - Vijay P. Singh
- Department
of Chemistry−BMC, Uppsala University, Box 576, SE-751 23 Uppsala, Sweden
| | - Paul J. Gates
- School
of Chemistry, University of Bristol, Bristol BS8 1TS, United Kingdom
| | - Lars Engman
- Department
of Chemistry−BMC, Uppsala University, Box 576, SE-751 23 Uppsala, Sweden
| |
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