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Verma M, Saboo N. Use of antioxidants to retard aging of bitumen: A review. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2024:10.1007/s11356-024-34431-2. [PMID: 39060889 DOI: 10.1007/s11356-024-34431-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2024] [Accepted: 07/15/2024] [Indexed: 07/28/2024]
Abstract
Oxidative aging of bitumen is an inevitable and irreversible phenomenon. Exposure to detrimental factors such as sunlight, oxygen, and UV radiations accelerates the aging of bitumen and bituminous pavement. The aging process induces hardening and embrittlement in bitumen, leading to premature pavement failure. Therefore, for constructing sustainable long-lasting pavements anti-aging additives are used. Among the available additives, the use of antioxidants has emerged as a promising solution to mitigate the aging of bitumen. The current review aims to summarise the existing literature for a comprehensive understanding of the effectiveness of these additives as aging inhibitors. It provides an overview of the chemical pathway involved during bitumen oxidation and various quantification techniques to measure the effect of aging. This review also highlights the potential use of antioxidants in bitumen and elaborates on the working mechanism of different types of antioxidants to prevent bitumen aging. Further, the effect of modification in bitumen at micro, macro, and mixture levels are discussed. Additionally, cost analysis and future prospects on the use of antioxidants for bitumen are presented.
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Affiliation(s)
- Muskan Verma
- Department of Civil Engineering, Indian Institute of Technology, Roorkee, India
| | - Nikhil Saboo
- Department of Civil Engineering, Indian Institute of Technology, Roorkee, India.
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2
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Amorati R, Guo Y, Budhlall BM, Barry CF, Cao D, Challa SSRK. Tandem Hydroperoxyl-Alkylperoxyl Radical Quenching by an Engineered Nanoporous Cerium Oxide Nanoparticle Macrostructure (NCeONP): Toward Efficient Solid-State Autoxidation Inhibitors. ACS OMEGA 2023; 8:40174-40183. [PMID: 37929124 PMCID: PMC10620910 DOI: 10.1021/acsomega.3c03654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/24/2023] [Accepted: 10/05/2023] [Indexed: 11/07/2023]
Abstract
The use of nanomaterials as inhibitors of the autoxidation of organic materials is attracting tremendous interest in petrochemistry, food storage, and biomedical applications. Metal oxide materials and CeO2 in particular represent one of the most investigated inorganic materials with promising radical trapping and antioxidant abilities. However, despite the importance, examples of the CeO2 material's ability to retard the autoxidation of organic substrates are still lacking, together with a plausible chemical mechanism for radical trapping. Herein, we report the synthesis of a new CeO2-derived nanoporous material (NCeONP) with excellent autoxidation inhibiting properties due to its ability to catalyze the cross-dismutation of alkyl peroxyl (ROO•) and hydroperoxyl (HOO•) radicals, generated in the system by the addition of the pro-aromatic hydrocarbon γ-terpinene. The antioxidant ability of NCeONP is superior to that of other nanosized metal oxides, including TiO2, ZnO, ZrO2, and pristine CeO2 nanoparticles. Studies of the reaction with a sacrificial reductant allowed us to propose a mechanism of inhibition consisting of H atom transfer from HOO• to the metal oxides (MOx + HOO• → MOx-H• + O2), followed by the release of the H atom to an ROO• radical (MOx-H• + ROO• → MOx + ROOH). Besides identifying NCeONP as a promising material for developing effective antioxidants, our study provides the first evidence of a radical mechanism that can be exploited to develop novel solid-state autoxidation inhibitors.
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Affiliation(s)
- Riccardo Amorati
- Department
of Chemistry “G. Ciamician”, University of Bologna, Via Gobetti 83, 40129 Bologna, Italy
| | - Yafang Guo
- Department
of Chemistry “G. Ciamician”, University of Bologna, Via Gobetti 83, 40129 Bologna, Italy
| | - Bridgette Maria Budhlall
- Department
of Plastics Engineering, University of Massachusetts
Lowell, Lowell, Massachusetts 01854, United States
| | - Carol Forance Barry
- Department
of Plastics Engineering, University of Massachusetts
Lowell, Lowell, Massachusetts 01854, United States
| | - Dongmei Cao
- Shared
Instrumentation Facility, Louisiana State
University, 121 Chemistry and Material Building, 4048 Highland Rd., Baton Rouge, Louisiana 70809, United States
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3
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Valgimigli L. Lipid Peroxidation and Antioxidant Protection. Biomolecules 2023; 13:1291. [PMID: 37759691 PMCID: PMC10526874 DOI: 10.3390/biom13091291] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Revised: 08/17/2023] [Accepted: 08/21/2023] [Indexed: 09/29/2023] Open
Abstract
Lipid peroxidation (LP) is the most important type of oxidative-radical damage in biological systems, owing to its interplay with ferroptosis and to its role in secondary damage to other biomolecules, such as proteins. The chemistry of LP and its biological consequences are reviewed with focus on the kinetics of the various processes, which helps understand the mechanisms and efficacy of antioxidant strategies. The main types of antioxidants are discussed in terms of structure-activity rationalization, with focus on mechanism and kinetics, as well as on their potential role in modulating ferroptosis. Phenols, pyri(mi)dinols, antioxidants based on heavy chalcogens (Se and Te), diarylamines, ascorbate and others are addressed, along with the latest unconventional antioxidant strategies based on the double-sided role of the superoxide/hydroperoxyl radical system.
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Affiliation(s)
- Luca Valgimigli
- Department of Chemistry "G. Ciamician", University of Bologna, Via Piero Gobetti 85, 40129 Bologna, Italy
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4
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Jia X, Tian X, Zhuang D, Wan Z, Gu J, Li Z. Copper-Catalyzed Intermolecular Cross-dehydrogenative C-N Coupling at Room Temperature via Remote Activating Group Enabled Radical Relay Strategy. Org Lett 2023; 25:2012-2017. [PMID: 36944029 DOI: 10.1021/acs.orglett.3c00267] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/23/2023]
Abstract
Employing N-fluorobenzenesulfonimide (NFSI) as a nitrogen-centered radical (NCR) precursor, an intermolecular C(sp2)-N coupling on heteroarenes or substituted benzenes with remote activated aniline derivatives via copper catalyzed N-N radical relay strategy at room temperature is developed. Good to excellent yields are acquired, and no ligand or additive is required. Reaction scope investigation and preliminary mechanistic studies demonstrate that the remote activating strategy and delicate control on the reactivities of active NCR species are essential to guarantee satisfactory chemo- and site-selectivity.
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Affiliation(s)
- Xiaoqi Jia
- Department of Pharmaceutical and Biological Engineering, School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China
| | - Xiangmin Tian
- Department of Pharmaceutical and Biological Engineering, School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China
| | - Dailin Zhuang
- Department of Pharmaceutical and Biological Engineering, School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China
| | - Zhenyang Wan
- Department of Pharmaceutical and Biological Engineering, School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China
| | - Jiahao Gu
- Department of Pharmaceutical and Biological Engineering, School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China
| | - Ziyuan Li
- Department of Pharmaceutical and Biological Engineering, School of Chemical Engineering, Sichuan University, No. 24 South Section 1, Yihuan Road, Chengdu 610065, China
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5
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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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6
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Charlton NC, Mastyugin M, Török B, Török M. Structural Features of Small Molecule Antioxidants and Strategic Modifications to Improve Potential Bioactivity. Molecules 2023; 28:molecules28031057. [PMID: 36770724 PMCID: PMC9920158 DOI: 10.3390/molecules28031057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Revised: 01/16/2023] [Accepted: 01/18/2023] [Indexed: 01/21/2023] Open
Abstract
This review surveys the major structural features in various groups of small molecules that are considered to be antioxidants, including natural and synthetic compounds alike. Recent advances in the strategic modification of known small molecule antioxidants are also described. The highlight is placed on changing major physicochemical parameters, including log p, bond dissociation energy, ionization potential, and others which result in improved antioxidant activity.
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7
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Fu YH, Zhang Y, Wang F, Zhao L, Shen GB, Zhu XQ. Quantitative evaluation of the actual hydrogen atom donating activities of O-H bonds in phenols: structure-activity relationship. RSC Adv 2023; 13:3295-3305. [PMID: 36756400 PMCID: PMC9869660 DOI: 10.1039/d2ra06877j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2022] [Accepted: 12/31/2022] [Indexed: 01/25/2023] Open
Abstract
The H-donating activity of phenol and the H-abstraction activity of phenol radicals have been extensively studied. In this article, the second-order rate constants of 25 hydrogen atom transfer (HAT) reactions between phenols and PINO and DPPH radicals in acetonitrile at 298 K were studied. Thermo-kinetic parameters ΔG ≠o(XH) were obtained using a kinetic equation [ΔG ≠ XH/Y = ΔG ≠o(XH) + ΔG ≠o(Y)]. Bond dissociation free energies ΔG o(XH) were calculated by the iBonD HM method, whose details are available at https://pka.luoszgroup.com/bde_prediction. Intrinsic resistance energies ΔG ≠ XH/X and ΔG ≠o(X) were determined as ΔG ≠o(XH) and ΔG o(XH) were available. ΔG o(XH), ΔG ≠ XH/X, ΔG ≠o(XH) and ΔG ≠o(X) were used to assess the H-donating abilities of the studied phenols and the H-abstraction abilities of phenol radicals in thermodynamics, kinetics and actual HAT reactions. The effect of structures on these four parameters was discussed. The reliabilities of ΔG ≠o(XH) and ΔG ≠o(X) were examined. The difference between the method of determining ΔG ≠ XH/X mentioned in this study and the dynamic nuclear magnetic method mentioned in the literature was studied. Via this study, not only ΔG o(XH), ΔG ≠ XH/X, ΔG ≠o(XH) and ΔG ≠o(X) of phenols could be quantitatively evaluated, but also the structure-activity relationship of phenols is clearly demonstrated. Moreover, it lays the foundation for designing and synthesizing more antioxidants and radicals.
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Affiliation(s)
- Yan-Hua Fu
- College of Chemistry and Environmental Engineering, Anyang Institute of Technology Anyang Henan 455000 China
| | - Yanwei Zhang
- College of Chemistry and Environmental Engineering, Anyang Institute of Technology Anyang Henan 455000 China
| | - Fang Wang
- College of Chemistry and Environmental Engineering, Anyang Institute of Technology Anyang Henan 455000 China
| | - Ling Zhao
- College of Chemistry and Environmental Engineering, Anyang Institute of Technology Anyang Henan 455000 China
| | - Guang-Bin Shen
- School of Medical Engineering, Jining Medical UniversityJiningShandong272000P. R. China
| | - Xiao-Qing Zhu
- Department of Chemistry, Nankai UniversityTianjin300071China
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8
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Cariola A, El Chami M, Granatieri J, Valgimigli L. Anti-Tyrosinase and Antioxidant Activity of Meroterpene Bakuchiol from Psoralea corylifolia (L.). Food Chem 2022; 405:134953. [DOI: 10.1016/j.foodchem.2022.134953] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2022] [Revised: 11/08/2022] [Accepted: 11/10/2022] [Indexed: 11/18/2022]
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9
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Fu Y, Wang Z, Zhang Y, Shen G, Zhu X. Quantitative Evaluation of the Hydrogen‐Donating Abilities ofAmines and Amides in Acetonitrile. ChemistrySelect 2022. [DOI: 10.1002/slct.202202625] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Yan‐Hua Fu
- College of Chemistry and Environmental Engineering Anyang Institute of Technology Anyang Henan 455000 China
| | - Zhen Wang
- College of Chemistry and Environmental Engineering Anyang Institute of Technology Anyang Henan 455000 China
| | - Yanwei Zhang
- College of Chemistry and Environmental Engineering Anyang Institute of Technology Anyang Henan 455000 China
| | - Guang‐Bin Shen
- School of Medical Engineering Jining Medical University Jining Shandong 272000 P. R. China
| | - Xiao‐Qing Zhu
- Department of Chemistry Nankai University Tianjin 300071 China
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10
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Alfieri ML, Panzella L, Amorati R, Cariola A, Valgimigli L, Napolitano A. Role of Sulphur and Heavier Chalcogens on the Antioxidant Power and Bioactivity of Natural Phenolic Compounds. Biomolecules 2022; 12:90. [PMID: 35053239 PMCID: PMC8774257 DOI: 10.3390/biom12010090] [Citation(s) in RCA: 11] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/22/2021] [Revised: 01/03/2022] [Accepted: 01/04/2022] [Indexed: 02/06/2023] Open
Abstract
The activity of natural phenols is primarily associated to their antioxidant potential, but is ultimately expressed in a variety of biological effects. Molecular scaffold manipulation of this large variety of compounds is a currently pursued approach to boost or modulate their properties. Insertion of S/Se/Te containing substituents on phenols may increase/decrease their H-donor/acceptor ability by electronic and stereo-electronic effects related to the site of substitution and geometrical constrains. Oxygen to sulphur/selenium isosteric replacement in resveratrol or ferulic acid leads to an increase in the radical scavenging activity with respect to the parent phenol. Several chalcogen-substituted phenols inspired by Vitamin E and flavonoids have been prepared, which in some cases prove to be chain-breaking antioxidants, far better than the natural counterparts. Conjugation of catechols with biological thiols (cysteine, glutathione, dihydrolipoic acid) is easily achieved by addition to the corresponding ortho-quinones. Noticeable examples of compounds with potentiated antioxidant activities are the human metabolite 5-S-cysteinyldopa, with high iron-induced lipid peroxidation inhibitory activity, due to strong iron (III) binding, 5-S-glutathionylpiceatannol a most effective inhibitor of nitrosation processes, and 5-S-lipoylhydroxytyrosol, and its polysulfides that proved valuable oxidative-stress protective agents in various cellular models. Different methodologies have been used for evaluation of the antioxidant power of these compounds against the parent compounds. These include kinetics of inhibition of lipid peroxidation alkylperoxyl radicals, common chemical assays of radical scavenging, inhibition of the OH• mediated hydroxylation/oxidation of model systems, ferric- or copper-reducing power, scavenging of nitrosating species. In addition, computational methods allowed researchers to determine the Bond Dissociation Enthalpy values of the OH groups of chalcogen modified phenolics and predict the best performing derivative. Finally, the activity of Se and Te containing compounds as mimic of glutathione peroxidase has been evaluated, together with other biological activities including anticancer action and (neuro)protective effects in various cellular models. These and other achievements are discussed and rationalized to guide future development in the field.
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Affiliation(s)
- Maria Laura Alfieri
- Department of Chemical Sciences, University of Naples “Federico II”, Via Cintia 21, I-80126 Naples, Italy; (M.L.A.); (L.P.)
| | - Lucia Panzella
- Department of Chemical Sciences, University of Naples “Federico II”, Via Cintia 21, I-80126 Naples, Italy; (M.L.A.); (L.P.)
| | - Riccardo Amorati
- Department of Chemistry “Giacomo Ciamician”, University of Bologna, Via S. Giacomo 11, I-40126 Bologna, Italy; (R.A.); (A.C.)
| | - Alice Cariola
- Department of Chemistry “Giacomo Ciamician”, University of Bologna, Via S. Giacomo 11, I-40126 Bologna, Italy; (R.A.); (A.C.)
| | - Luca Valgimigli
- Department of Chemistry “Giacomo Ciamician”, University of Bologna, Via S. Giacomo 11, I-40126 Bologna, Italy; (R.A.); (A.C.)
| | - Alessandra Napolitano
- Department of Chemical Sciences, University of Naples “Federico II”, Via Cintia 21, I-80126 Naples, Italy; (M.L.A.); (L.P.)
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11
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Zhao X, Yang F, Wang LL, Guo J, Xu YQ, Chen ZS, Ji K. Cu( ii)-Catalyzed C2-site functionalization of p-aminophenols: an approach for selective cross-dehydrogenative aminations. Org Chem Front 2022. [DOI: 10.1039/d1qo01675j] [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
Site selective cross dehydrogenative aminations from precursors without preactivated C–H and N–H bonds have been challenging.
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Affiliation(s)
- Xin Zhao
- College of Chemistry and Pharmacy, Northwest A&F University; Shaanxi Key Laboratory of Natural Products & Chemical Biology, 3 Taicheng Road, Yangling, 712100, Shaanxi, P. R. China
- School of Pharmacy, Baotou Medical College, Baotou 014060, Inner Mongolia, P. R. China
| | - Fang Yang
- College of Chemistry and Pharmacy, Northwest A&F University; Shaanxi Key Laboratory of Natural Products & Chemical Biology, 3 Taicheng Road, Yangling, 712100, Shaanxi, P. R. China
| | - Lin-Lin Wang
- College of Chemistry and Pharmacy, Northwest A&F University; Shaanxi Key Laboratory of Natural Products & Chemical Biology, 3 Taicheng Road, Yangling, 712100, Shaanxi, P. R. China
| | - Jing Guo
- College of Chemistry and Pharmacy, Northwest A&F University; Shaanxi Key Laboratory of Natural Products & Chemical Biology, 3 Taicheng Road, Yangling, 712100, Shaanxi, P. R. China
| | - Yu-Qin Xu
- College of Chemistry and Pharmacy, Northwest A&F University; Shaanxi Key Laboratory of Natural Products & Chemical Biology, 3 Taicheng Road, Yangling, 712100, Shaanxi, P. R. China
| | - Zi-Sheng Chen
- College of Chemistry and Pharmacy, Northwest A&F University; Shaanxi Key Laboratory of Natural Products & Chemical Biology, 3 Taicheng Road, Yangling, 712100, Shaanxi, P. R. China
| | - Kegong Ji
- College of Chemistry and Pharmacy, Northwest A&F University; Shaanxi Key Laboratory of Natural Products & Chemical Biology, 3 Taicheng Road, Yangling, 712100, Shaanxi, P. R. China
- Guangdong Provincial Key Laboratory of Catalysis, Southern University of Science and Technology, Shenzhen 518055, China
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12
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Ren Y, An Z, Zhao P, Li M, Yan R. Iron-catalyzed one-pot cyclization and amination of 2-alkynylthioanisoles using nitrosobenzenes as the amine source. Org Chem Front 2022. [DOI: 10.1039/d2qo00535b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A direct strategy for the synthesis of 3-phenylaminobenzothiophene via iron-catalyzed cyclization of 2-alkynylthioanisoles and nitrosoarenes is presented in this work.
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Affiliation(s)
- Yi Ren
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, China
| | - Zhenyu An
- College of Pharmacy, Ningxia Medical University, Yinchuan, Ningxia, China
| | - Pengbo Zhao
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, China
| | - Mengxing Li
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, China
| | - Rulong Yan
- State Key Laboratory of Applied Organic Chemistry, College of Chemistry and Chemical Engineering, Lanzhou University, Lanzhou, Gansu, China
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13
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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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14
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Rajendran T, Rajagopal S, Srinivasan C, Balakrishnan G, Sivasubramanian VK, Ganesan M. Effect of Sodium Dodecyl Sulfate on the Photoinduced Electron Transfer Reactions of Ruthenium(II)–Polypyridine Complexes with Phenolate Ions. RUSSIAN JOURNAL OF PHYSICAL CHEMISTRY A 2021. [DOI: 10.1134/s0036024421100216] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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15
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Abstract
Tremendous progress has been made in the field of ferroptosis since this regulated cell death process was first named in 2012. Ferroptosis is initiated upon redox imbalance and driven by excessive phospholipid peroxidation. Levels of multiple intracellular nutrients (iron, selenium, vitamin E and coenzyme Q10) are intimately related to the cellular antioxidant system and participate in the regulation of ferroptosis. Dietary intake of monounsaturated fatty acids (MUFA) and polyunsaturated fatty acids (PUFA) regulates ferroptosis by directly modifying the fatty acid composition in cell membranes. In addition, amino acids and glucose (energy stress) manipulate the ferroptosis pathway through the nutrient-sensitive kinases mechanistic target of rapamycin complex 1 (mTORC1) and AMP-activated protein kinase (AMPK). Understanding the molecular interaction between nutrient signals and ferroptosis sensors might help in the identification of the roles of ferroptosis in normal physiology and in the development of novel pharmacological targets for the treatment of ferroptosis-related diseases.
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Abstract
Autoxidation limits the longevity of essentially all hydrocarbons and materials made therefrom - including us. The radical chain reaction responsible often leads to complex mixtures of hydroperoxides, alkyl peroxides, alcohols, carbonyls and carboxylic acids, which change the physical properties of the material - be it a lubricating oil or biological membrane. Autoxidation is inhibited by addtitives such as radical-trapping antioxidants, which intervene directly in the chain reaction. Herein we review the most salient features of autoxidation and its inhibition, emphasizing concepts and mechanistic considerations important in understanding this chemistry across the wide range of contexts in which it is relevant.
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Affiliation(s)
- Julian Helberg
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie Pvt., Ottawa, ON K1N 6N5, Canada.
| | - Derek A Pratt
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie Pvt., Ottawa, ON K1N 6N5, Canada.
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17
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Chen Y, Huang Z, Jiang Y, Shu S, Yang S, Shi DQ, Zhao Y. Direct para-Selective C-H Amination of Iodobenzenes: Highly Efficient Approach for the Synthesis of Diarylamines. J Org Chem 2021; 86:8226-8235. [PMID: 34080879 DOI: 10.1021/acs.joc.1c00681] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
Iodine(III)-mediated synthesis of 4-iodo-N-phenylaniline from iodobenzene has been achieved, and the reaction can proceed under mild conditions. A variety of functional groups were well tolerated, providing the corresponding products in moderate to good yields. The remaining iodine group provides an effective platform for converting the products into several valuable asymmetric diphenylamines. Most importantly, this reaction can be easily scaled up to the ten-gram scale, highlighting its synthetic utility. The mechanistic study revealed that the in situ generated aryl hypervalent iodine intermediate is the key factor to realize this para-selective C-H amination reaction.
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Affiliation(s)
- Yujie Chen
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Zhibin Huang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Yaqiqi Jiang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Sai Shu
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Shan Yang
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Da-Qing Shi
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China
| | - Yingsheng Zhao
- Key Laboratory of Organic Synthesis of Jiangsu Province, College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou 215123, P. R. China.,School of Chemistry and Chemical Engineering, Henan Normal University, Henan 453007, China
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18
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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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19
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Thao PT, Tran BT, Thong NM, Quang DT, Hien NK, Nguyen MT, Nam PC. Substituent Effects on the N-H Bond Dissociation Enthalpies, Ionization Energies, Acidities, and Radical Scavenging Behavior of 3,7-Disubstituted Phenoxazines and 3,7-Disubstituted Phenothiazines. ACS OMEGA 2020; 5:27572-27581. [PMID: 33134721 PMCID: PMC7594321 DOI: 10.1021/acsomega.0c04144] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2020] [Accepted: 10/05/2020] [Indexed: 06/11/2023]
Abstract
The substituent effects on the N-H bond dissociation enthalpies (BDE), ionization energies (IE), acidities (proton affinity, PA), and radical scavenging behavior of 3,7-disubstituted phenoxazines (PhozNHs) and 3,7-disubstituted phenothiazines (PhtzNHs) were determined using density functional theory, with the M05-2X functional in conjunction with the 6-311++G(d,p) basis set. These thermochemical parameters calculated in both gas phase and benzene solution with respect to the changes in several different substituents including halogen, electron-withdrawing, and electron-donating groups at both 3 and 7 positions in both PhozNHs and PhtzNHs systems were analyzed in terms of the inherent relationships between them with some quantitative substituent effect parameters. The kinetic rate constants of hydrogen-atom exchange reactions between PhozNH and PhtzNH derivatives with the HOO• radical were also calculated, and the effects of the substituents on the kinetic behaviors of these reactions were thereby quantitatively evaluated.
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Affiliation(s)
- Pham Thi
Thu Thao
- Department
of Chemistry, The University of Da Nang-University
of Science and Technology, Da Nang 550000, Vietnam
- Department
of Chemistry, University of Sciences, Hue
University, Hue 530000, Vietnam
- Le
Quy Don Gifted High School Quang Tri, Dong Ha, Quang Tri 520000, Vietnam
| | - Binh Thuc Tran
- Department
of Chemistry, University of Sciences, Hue
University, Hue 530000, Vietnam
| | | | | | - Nguyen Khoa Hien
- Mientrung
Institute for Scientific Research, Vietnam
Academy of Science and Technology, Hue 530000, Vietnam
| | - Minh Tho Nguyen
- Institute
for Computational Science and Technology (ICST), Ho Chi Minh City 700000, Vietnam
- Department
of Chemistry, KU Leuven, Leuven 3001, Belgium
| | - Pham Cam Nam
- Department
of Chemistry, The University of Da Nang-University
of Science and Technology, Da Nang 550000, Vietnam
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20
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Schröder A, Laguerre M, Sprakel J, Schroën K, Berton-Carabin CC. Pickering particles as interfacial reservoirs of antioxidants. J Colloid Interface Sci 2020; 575:489-498. [DOI: 10.1016/j.jcis.2020.04.069] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/24/2020] [Revised: 04/17/2020] [Accepted: 04/17/2020] [Indexed: 11/26/2022]
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21
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Higgins CL, Filip SV, Afsar A, Hayes W. Increasing the antioxidant capability via the synergistic effect of coupling diphenylamine with sterically hindered phenol. Tetrahedron 2019. [DOI: 10.1016/j.tet.2019.130759] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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22
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Wang S, Yu S, Feng J, Liu S. A highly efficient antioxidant based on boron and a Schiff base bridged phenolic diphenylamine: synthesis, crystal structure and thermal and antioxidant properties. ACTA CRYSTALLOGRAPHICA SECTION C-STRUCTURAL CHEMISTRY 2019; 75:1274-1279. [PMID: 31484816 DOI: 10.1107/s2053229619011331] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Accepted: 08/13/2019] [Indexed: 11/10/2022]
Abstract
Antioxidants can effectively protect vegetable-oil-based lubricants against oxidative degradation and prolong their service life. A novel compound, (E)-4-({3,5-di-tert-butyl-2-[(diphenylboranyl)oxy]benzylidene}amino)-N-phenylaniline (BSPD) or {2-[(4-anilinophenyl)iminomethyl-κN]-4,6-di-tert-butylphenolato-κO}diphenylboron, C39H41BN2O, was synthesized by a one-pot reaction of the Schiff base bridged phenolic diphenylamine 2,4-di-tert-butyl-6-{N-[4-(phenylamino)phenyl]carboximidoyl}phenol (SPD) with phenylboronic acid. The corresponding single-crystal X-ray study revealed that the B atom in BSPD has a typical tetrahedral geometry, and the N,O-chelated six-membered ring adopts a chair conformation. According to thermogravimetric analysis, the 5% weight-loss temperature of BSPD increases to 328 °C and the 95% weight-loss temperature is up to 414 °C. More importantly, the antioxidant capability of BSPD in vegetable oil is much better than that of commercial antioxidants [diphenylamine (DPA) and 2,6-di-tert-butyl-4-methylphenol (BHT)] and unmodified SPD.
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Affiliation(s)
- Shengpei Wang
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, No. 1219 Zhongguan West Road, Ningbo City, Zhejiang Province 315201, People's Republic of China
| | - Shasha Yu
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, No. 1219 Zhongguan West Road, Ningbo City, Zhejiang Province 315201, People's Republic of China
| | - Jianxiang Feng
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, No. 1219 Zhongguan West Road, Ningbo City, Zhejiang Province 315201, People's Republic of China
| | - Shenggao Liu
- Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, No. 1219 Zhongguan West Road, Ningbo City, Zhejiang Province 315201, People's Republic of China
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23
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Abstract
The rationale and scope of the main issues of antioxidant measurement are presented, with basic definitions and terms in antioxidant research (such as reactive species and related antioxidative defenses, oxidative stress, and antioxidant activity and capacity) in a historical background. An overview of technical problems and expectations is given in terms of interpretation of results, precision and comparability of methods, capability of simulating physical reality, and analytical performance (sensitivity, selectivity, etc.). Current analytical methods for measuring antioxidant and antiradical activity are classified from various viewpoints. Reaction kinetics and thermodynamics of current analytical methods are discussed, describing physicochemical aspects of antioxidant action and measurement. Controversies and limitations of the widely used antioxidant assays are elaborated in detail. Emerging techniques in antioxidant testing (e.g., nanotechnology, sensors, electrochemistry, chemometry, and hyphenated methods) are broadly introduced. Finally, hints for the selection of suitable assays (i.e., preferable for a specific purpose) and future prospects are given.
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Affiliation(s)
- Reşat Apak
- Department of Chemistry, Faculty of Engineering , Istanbul University-Cerrahpasa , Avcilar, 34320 Istanbul , Turkey
- Turkish Academy of Sciences (TUBA) , Piyade Street 27 , Cankaya, 06690 Ankara , Turkey
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24
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Pradhan S, Roy S, Ghosh S, Chatterjee I. Regiodivergent Aromatic Electrophilic Substitution Using Nitrosoarenes in Hexafluoroisopropanol: A Gateway for Diarylamines and
p
‐Iminoquinones Synthesis. Adv Synth Catal 2019. [DOI: 10.1002/adsc.201900788] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Suman Pradhan
- Department of ChemistryIndian Institute of Technology Ropar Nangal Road Rupnagar Punjab-140001 India
| | - Sourav Roy
- Department of ChemistryIndian Institute of Technology Ropar Nangal Road Rupnagar Punjab-140001 India
| | - Soumen Ghosh
- Department of ChemistryIndian Institute of Technology Ropar Nangal Road Rupnagar Punjab-140001 India
| | - Indranil Chatterjee
- Department of ChemistryIndian Institute of Technology Ropar Nangal Road Rupnagar Punjab-140001 India
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25
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Bietti M, Cucinotta E, DiLabio GA, Lanzalunga O, Lapi A, Mazzonna M, Romero-Montalvo E, Salamone M. Evaluation of Polar Effects in Hydrogen Atom Transfer Reactions from Activated Phenols. J Org Chem 2019; 84:1778-1786. [DOI: 10.1021/acs.joc.8b02571] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Massimo Bietti
- Dipartimento di Scienze e Tecnologie Chimiche, Università “Tor Vergata”, Via della Ricerca Scientifica, 1 I-00133 Rome, Italy
| | - Erica Cucinotta
- Dipartimento di Chimica, Sapienza Università di Roma and Sezione Meccanismi di Reazione, Istituto CNR per i Sistemi Biologici (ISB-CNR), Sapienza Università di Roma, P.le A. Moro, 5 I-00185 Rome, Italy
| | - Gino A. DiLabio
- Department of Chemistry, University of British Columbia, 3247 University Way, Kelowna, British Columbia V1V 1V7, Canada
- Faculty of Management, University of British Columbia, 1137 Alumni Avenue Kelowna, British Columbia V1V 1V7, Canada
| | - Osvaldo Lanzalunga
- Dipartimento di Chimica, Sapienza Università di Roma and Sezione Meccanismi di Reazione, Istituto CNR per i Sistemi Biologici (ISB-CNR), Sapienza Università di Roma, P.le A. Moro, 5 I-00185 Rome, Italy
| | - Andrea Lapi
- Dipartimento di Chimica, Sapienza Università di Roma and Sezione Meccanismi di Reazione, Istituto CNR per i Sistemi Biologici (ISB-CNR), Sapienza Università di Roma, P.le A. Moro, 5 I-00185 Rome, Italy
| | - Marco Mazzonna
- Dipartimento di Chimica, Sapienza Università di Roma and Sezione Meccanismi di Reazione, Istituto CNR per i Sistemi Biologici (ISB-CNR), Sapienza Università di Roma, P.le A. Moro, 5 I-00185 Rome, Italy
| | - Eduardo Romero-Montalvo
- Department of Chemistry, University of British Columbia, 3247 University Way, Kelowna, British Columbia V1V 1V7, Canada
| | - Michela Salamone
- Dipartimento di Scienze e Tecnologie Chimiche, Università “Tor Vergata”, Via della Ricerca Scientifica, 1 I-00133 Rome, Italy
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26
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Theoretical and experimental analysis of the antioxidant features of substituted phenol and aniline model compounds. Struct Chem 2018. [DOI: 10.1007/s11224-018-1183-4] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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27
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Poon JF, Pratt DA. Recent Insights on Hydrogen Atom Transfer in the Inhibition of Hydrocarbon Autoxidation. Acc Chem Res 2018; 51:1996-2005. [PMID: 30035527 DOI: 10.1021/acs.accounts.8b00251] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Autoxidation, the free radical chain reaction that nominally inserts O2 into hydrocarbons to give peroxides, is primarily responsible for the degradation of all organic materials. Peroxyl radicals propagate autoxidation mainly by abstraction of labile H-atoms from the hydrocarbons, whereas radical-trapping antioxidants (RTAs) inhibit autoxidation by donating an H-atom to the peroxyl radical to give a nonpropagating radical. As such, a detailed understanding of the kinetics and thermodynamics of H-atom transfer (HAT) reactions to peroxyl radicals, and the effects of sterics, electronics, and medium thereupon, is key to understanding the mechanisms and products of autoxidation and the ability of RTAs to inhibit it. Due to their relatively weak O-H and N-H bonds, phenols and aromatic amines have long been utilized as RTAs, but only phenols have been extensively optimized to maximize their reactivity. Amines offer greater structural variability owing to their trivalent central nitrogen atom. Simply linking the two aromatic rings of a diarylamine to afford a phenoxazine offers profound differences in HAT reactivity: 1000-times greater than diphenylamine and 10-fold more reactive than α-tocopherol, Nature's optimized phenolic RTA. Thus, phenoxazines are an exciting scaffold for RTA development. Indeed, we have recently shown that ring substitution of phenoxazine or 2,4-diazaphenoxazine can yield compounds that undergo barrierless HAT reactions with peroxyl radicals. Amines also have the distinct advantage that they can react with peroxyl radicals to yield nitroxides, which can inhibit autoxidation in a catalytic manner utilizing the substrate itself as the stoichiometric reductant. Herein we provide an account of our recent efforts to understand how they manage this feat, which have revealed at least four mechanisms depending on the specific reaction conditions (i.e., saturated hydrocarbons at elevated temperatures, unsaturated hydrocarbons, acidic media, aqueous media/lipid dispersions). We also reiterate how their impressive RTA activity translates from solution to mammalian cell culture, wherein we have demonstrated that diarylamines and their derived nitroxides are potent inhibitors of ferroptosis, a recently characterized form of cell death associated with lipid peroxidation (autoxidation). In addition to phenols and amines, organosulfur compounds have long been used as antioxidants. The prevailing view has been that they undergo ionic reactions with product peroxides, preventing the initiation of further chain reactions. In recent years, we have found that many organosulfur compounds exhibit very good RTA activity. In particular, sulfenic acids (RSOH) and hydropersulfides (RSSH) are found to be among the best HAT agents known, particularly to peroxyl radicals where secondary orbital interactions are found to play a significant role. Consequently, oxidation of the sulfenic acid to a sulfinic acid greatly diminishes its HAT reactivity to peroxyls. Polysulfides and their oxides also undergo direct reactions with peroxyl radicals, thereby inhibiting autoxidation, but do so by homolytic substitution reactions. These insights suggest that the RTA activity of organosulfur compounds may be as important to the inhibition of hydrocarbon autoxidation, if not more so, than their ionic reactions.
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Affiliation(s)
- Jia-Fei Poon
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie Pvt. Ottawa, ON K1N 6N5, Canada
| | - Derek A. Pratt
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie Curie Pvt. Ottawa, ON K1N 6N5, Canada
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28
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Roscales S, Csákÿ AG. Synthesis of Di(hetero)arylamines from Nitrosoarenes and Boronic Acids: A General, Mild, and Transition-Metal-Free Coupling. Org Lett 2018; 20:1667-1671. [DOI: 10.1021/acs.orglett.8b00473] [Citation(s) in RCA: 38] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/16/2023]
Affiliation(s)
- Silvia Roscales
- Instituto Pluridisciplinar, Universidad Complutense, Campus de Excelencia Internacional Moncloa, Paseo de Juan XXIII, 1, 28040 Madrid, Spain
| | - Aurelio G. Csákÿ
- Instituto Pluridisciplinar, Universidad Complutense, Campus de Excelencia Internacional Moncloa, Paseo de Juan XXIII, 1, 28040 Madrid, Spain
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29
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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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30
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Roy SK, Tiwari A, Saleem M, Jana CK. Metal free direct C(sp2)–H arylaminations using nitrosoarenes to 2-hydroxy-di(het)aryl amines as multifunctional Aβ-aggregation modulators. Chem Commun (Camb) 2018; 54:14081-14084. [DOI: 10.1039/c8cc08470j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
Abstract
A direct C(sp2)–H arylamination of 2-hydroxyarenes using nitrosoarenes was achieved under metal free conditions without the aid of additional reagents/steps for N–O bond cleavage.
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Affiliation(s)
- Subhra Kanti Roy
- Department of Chemistry
- Indian Institute of Technology Guwahati
- India
| | - Anuj Tiwari
- Department of Life Sciences
- National Institute of Technology
- Rourkela
- India
| | - Mohammed Saleem
- Department of Life Sciences
- National Institute of Technology
- Rourkela
- India
| | - Chandan K. Jana
- Department of Chemistry
- Indian Institute of Technology Guwahati
- India
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31
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Joly JF, Miller RE. Density Functional Theory Rate Calculation of Hydrogen Abstraction Reactions of N-Phenyl-α-naphthylamine Antioxidants. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b04073] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jean-François Joly
- Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, K1S 5B6 Ontario, Canada
| | - Ronald E. Miller
- Department of Mechanical and Aerospace Engineering, Carleton University, 1125 Colonel By Drive, Ottawa, K1S 5B6 Ontario, Canada
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32
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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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33
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De Simone A, Bartolini M, Baschieri A, Apperley KYP, Chen HH, Guardigni M, Montanari S, Kobrlova T, Soukup O, Valgimigli L, Andrisano V, Keillor JW, Basso M, Milelli A. Hydroxy-substituted trans-cinnamoyl derivatives as multifunctional tools in the context of Alzheimer's disease. Eur J Med Chem 2017; 139:378-389. [PMID: 28810189 DOI: 10.1016/j.ejmech.2017.07.058] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/15/2017] [Revised: 05/29/2017] [Accepted: 07/24/2017] [Indexed: 11/25/2022]
Abstract
Alzheimer's disease (AD) is a multifactorial pathology that requires multifaceted agents able to address its peculiar nature. In recent years, a plethora of proteins and biochemical pathways has been proposed as possible targets to counteract neurotoxicity. Although the complex scenario is not completely elucidated, close relationships are emerging among some of these actors. In particular, increasing evidence has shown that aggregation of amyloid beta (Aβ), glycogen synthase kinase 3β (GSK-3β) and oxidative stress are strictly interconnected and their concomitant modulation may have a positive and synergic effect in contrasting AD-related impairments. We designed compound 3 which demonstrated the ability to inhibit both GSK-3β (IC50 = 24.36 ± 0.01 μM) and Aβ42 self-aggregation (IC50 = 9.0 ± 1.4 μM), to chelate copper (II) and to act as exceptionally strong radical scavenger (kinh = 6.8 ± 0.5 · 105 M-1s-1) even in phosphate buffer at pH 7.4 (kinh = 3.2 ± 0.5 · 105 M-1s-1). Importantly, compound 3 showed high-predicted blood-brain barrier permeability, did not exert any significant cytotoxic effects in immature cortical neurons up to 50 μM and showed neuroprotective properties at micromolar concentration against toxic insult induced by glutamate.
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Affiliation(s)
- Angela De Simone
- Department for Life Quality Studies, Alma Mater Studiorum-University of Bologna, Corso d'Augusto 237, 47921 Rimini, Italy
| | - Manuela Bartolini
- Department of Pharmacy and Biotechnology, Alma Mater Studiorum-University of Bologna, Via Belmeloro 6, 40126 Bologna, Italy
| | - Andrea Baschieri
- Department of Chemistry "G. Ciamician", Alma Mater Studiorum-University of Bologna, Via S. Giacomo 11, 40126 Bologna, Italy
| | - Kim Y P Apperley
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie, Ottawa, ON, K1N 6N5, Canada
| | - Huan Huan Chen
- Department for Life Quality Studies, Alma Mater Studiorum-University of Bologna, Corso d'Augusto 237, 47921 Rimini, Italy
| | - Melissa Guardigni
- Department for Life Quality Studies, Alma Mater Studiorum-University of Bologna, Corso d'Augusto 237, 47921 Rimini, Italy
| | - Serena Montanari
- Department for Life Quality Studies, Alma Mater Studiorum-University of Bologna, Corso d'Augusto 237, 47921 Rimini, Italy
| | - Tereza Kobrlova
- Biomedical Research Center, University Hospital, Sokolska 581, 500 05 Hradec Kralove, Czech Republic
| | - Ondrej Soukup
- Biomedical Research Center, University Hospital, Sokolska 581, 500 05 Hradec Kralove, Czech Republic
| | - Luca Valgimigli
- Department of Chemistry "G. Ciamician", Alma Mater Studiorum-University of Bologna, Via S. Giacomo 11, 40126 Bologna, Italy
| | - Vincenza Andrisano
- Department for Life Quality Studies, Alma Mater Studiorum-University of Bologna, Corso d'Augusto 237, 47921 Rimini, Italy
| | - Jeffrey W Keillor
- Department of Chemistry and Biomolecular Sciences, University of Ottawa, 10 Marie-Curie, Ottawa, ON, K1N 6N5, Canada
| | - Manuela Basso
- Laboratory of Transcriptional Neurobiology, Centre for Integrative Biology, University of Trento, Via Sommarive 9, 38123 Trento, Italy
| | - Andrea Milelli
- Department for Life Quality Studies, Alma Mater Studiorum-University of Bologna, Corso d'Augusto 237, 47921 Rimini, Italy.
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34
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Chauvin JPR, Griesser M, Pratt DA. Hydropersulfides: H-Atom Transfer Agents Par Excellence. J Am Chem Soc 2017; 139:6484-6493. [DOI: 10.1021/jacs.7b02571] [Citation(s) in RCA: 60] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Jean-Philippe R. Chauvin
- Department of Chemistry and
Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Markus Griesser
- Department of Chemistry and
Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Derek A. Pratt
- Department of Chemistry and
Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
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35
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Yu S, Feng J, Cai T, Liu S. Schiff Base Bridged Phenolic Diphenylamines for Highly Efficient and Superior Thermostable Lubricant Antioxidants. Ind Eng Chem Res 2017. [DOI: 10.1021/acs.iecr.7b00313] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [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, No. 1219 Zhongguan West Road, Ningbo 315201, China
| | - Jianxiang Feng
- Polymers and Composites
Division,
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, No. 1219 Zhongguan West Road, Ningbo 315201, China
| | - Tao Cai
- Polymers and Composites
Division,
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, No. 1219 Zhongguan West Road, Ningbo 315201, China
| | - Shenggao Liu
- Polymers and Composites
Division,
Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, No. 1219 Zhongguan West Road, Ningbo 315201, China
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36
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Ferroptosis Inhibition: Mechanisms and Opportunities. Trends Pharmacol Sci 2017; 38:489-498. [PMID: 28363764 DOI: 10.1016/j.tips.2017.02.005] [Citation(s) in RCA: 370] [Impact Index Per Article: 52.9] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2017] [Revised: 02/21/2017] [Accepted: 02/27/2017] [Indexed: 02/06/2023]
Abstract
The past decade has yielded tremendous insights into how cells die. This has come with our understanding that several distinct forms of cell death are encompassed under the umbrella term necrosis. Among these distinct forms of regulated necrotic cell death, ferroptosis has attracted considerable attention owing to its putative involvement in diverse pathophysiological processes. A key feature of the ferroptosis process is the requirement of phospholipid peroxidation, a process that has been linked with several human pathologies. Now with the establishment of a connection between lipid peroxidation and a distinctive cell death pathway, the search for new small molecules able to suppress lipid peroxidation has gained momentum and may yield novel cytoprotective strategies. We review here advances in our understanding of the ferroptotic process and summarize the development of lipid peroxidation inhibitors with the ultimate goal of suppressing ferroptosis-relevant cell death and related pathologies.
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37
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Zilka O, Shah R, Li B, Friedmann Angeli JP, Griesser M, Conrad M, Pratt DA. On the Mechanism of Cytoprotection by Ferrostatin-1 and Liproxstatin-1 and the Role of Lipid Peroxidation in Ferroptotic Cell Death. ACS CENTRAL SCIENCE 2017; 3:232-243. [PMID: 28386601 PMCID: PMC5364454 DOI: 10.1021/acscentsci.7b00028] [Citation(s) in RCA: 561] [Impact Index Per Article: 80.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2017] [Indexed: 05/19/2023]
Abstract
Ferroptosis is a form of regulated necrosis associated with the iron-dependent accumulation of lipid hydroperoxides that may play a key role in the pathogenesis of degenerative diseases in which lipid peroxidation has been implicated. High-throughput screening efforts have identified ferrostatin-1 (Fer-1) and liproxstatin-1 (Lip-1) as potent inhibitors of ferroptosis - an activity that has been ascribed to their ability to slow the accumulation of lipid hydroperoxides. Herein we demonstrate that this activity likely derives from their reactivity as radical-trapping antioxidants (RTAs) rather than their potency as inhibitors of lipoxygenases. Although inhibited autoxidations of styrene revealed that Fer-1 and Lip-1 react roughly 10-fold more slowly with peroxyl radicals than reactions of α-tocopherol (α-TOH), they were significantly more reactive than α-TOH in phosphatidylcholine lipid bilayers - consistent with the greater potency of Fer-1 and Lip-1 relative to α-TOH as inhibitors of ferroptosis. None of Fer-1, Lip-1, and α-TOH inhibited human 15-lipoxygenase-1 (15-LOX-1) overexpressed in HEK-293 cells when assayed at concentrations where they inhibited ferroptosis. These results stand in stark contrast to those obtained with a known 15-LOX-1 inhibitor (PD146176), which was able to inhibit the enzyme at concentrations where it was effective in inhibiting ferroptosis. Given the likelihood that Fer-1 and Lip-1 subvert ferroptosis by inhibiting lipid peroxidation as RTAs, we evaluated the antiferroptotic potential of 1,8-tetrahydronaphthyridinols (hereafter THNs): rationally designed radical-trapping antioxidants of unparalleled reactivity. We show for the first time that the inherent reactivity of the THNs translates to cell culture, where lipophilic THNs were similarly effective to Fer-1 and Lip-1 at subverting ferroptosis induced by either pharmacological or genetic inhibition of the hydroperoxide-detoxifying enzyme Gpx4 in mouse fibroblasts, and glutamate-induced death of mouse hippocampal cells. These results demonstrate that potent RTAs subvert ferroptosis and suggest that lipid peroxidation (autoxidation) may play a central role in the process.
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Affiliation(s)
- Omkar Zilka
- Department
of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Ron Shah
- Department
of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Bo Li
- Department
of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - José Pedro Friedmann Angeli
- Institute
of Developmental Genetics, Helmholtz Zentrum München, Deutsches Forschungszentrum für Gesundheit
und Umwelt (GmbH), 85764 Neuherberg, München, Germany
| | - Markus Griesser
- Department
of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Marcus Conrad
- Institute
of Developmental Genetics, Helmholtz Zentrum München, Deutsches Forschungszentrum für Gesundheit
und Umwelt (GmbH), 85764 Neuherberg, München, Germany
| | - Derek A. Pratt
- Department
of Chemistry and Biomolecular Sciences, University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
- E-mail:
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38
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Abstract
Recent advances in our understanding of lipid peroxidation, a degenerative process that is believed to play a key role in the pathogenesis of many diseases, are highlighted. In particular, the factors that control the kinetics and regio-/stereochemical outcomes of the autoxidation of both polyunsaturated fatty acids and sterols and the subsequent decomposition of the hydroperoxide products to cytotoxic derivatives are discussed. These advances promise to help clarify the role of lipid peroxidation in cell death and human disease.
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Affiliation(s)
- Zosia A M Zielinski
- Department of Chemistry and Biomolecular Sciences, University of Ottawa , Ottawa, Ontario, Canada K1N 6N5
| | - Derek A Pratt
- Department of Chemistry and Biomolecular Sciences, University of Ottawa , Ottawa, Ontario, Canada K1N 6N5
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39
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Inami K, Okayama Y, Harada M, Morita M, Mochizuki M. Synthesis and Radical Scavenging Activity of Substituted Benzo[h]chromanols. HETEROCYCLES 2017. [DOI: 10.3987/com-17-13671] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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40
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Chauvin JPR, Haidasz EA, Griesser M, Pratt DA. Polysulfide-1-oxides react with peroxyl radicals as quickly as hindered phenolic antioxidants and do so by a surprising concerted homolytic substitution. Chem Sci 2016; 7:6347-6356. [PMID: 28567247 PMCID: PMC5450444 DOI: 10.1039/c6sc01434h] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2016] [Accepted: 06/22/2016] [Indexed: 11/21/2022] Open
Abstract
Polysulfides are important additives to a wide variety of industrial and consumer products and figure prominently in the chemistry and biology of garlic and related medicinal plants. Although their antioxidant activity in biological contexts has received only recent attention, they have long been ascribed 'secondary antioxidant' activity in the chemical industry, where they are believed to react with the hydroperoxide products of autoxidation to slow the auto-initiation of new autoxidative chain reactions. Herein we demonstrate that the initial products of trisulfide oxidation, trisulfide-1-oxides, are surprisingly reactive 'primary antioxidants', which slow autoxidation by trapping chain-carrying peroxyl radicals. In fact, they do so with rate constants (k = 1-2 × 104 M-1 s-1 at 37 °C) that are indistinguishable from those of the most common primary antioxidants, i.e. hindered phenols, such as BHT. Experimental and computational studies demonstrate that the reaction occurs by a concerted bimolecular homolytic substitution (SH2), liberating a perthiyl radical - which is ca. 16 kcal mol-1 more stable than a peroxyl radical. Interestingly, the (electrophilic) peroxyl radical nominally reacts as a nucleophile - attacking the of the trisulfide-1-oxide - a role hitherto suspected only for its reactions at metal atoms. The analogous reactions of trisulfides are readily reversible and not kinetically competent to inhibit hydrocarbon autoxidation, consistent with the longstanding view that organosulfur compounds must be oxidized to afford significant antioxidant activity. The reactivity of trisulfides and their oxides are contrasted with what is known of their shorter cousins and predictions are made and tested with regards to the reactivity of higher polysulfides and their 1-oxides - the insights from which may be exploited in the design of future antioxidants.
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Affiliation(s)
- Jean-Philippe R Chauvin
- Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie Curie Pvt. , Ottawa , Ontario , Canada . ; ; Tel: +1-613-562-5800 ext. 2119
| | - Evan A Haidasz
- Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie Curie Pvt. , Ottawa , Ontario , Canada . ; ; Tel: +1-613-562-5800 ext. 2119
| | - Markus Griesser
- Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie Curie Pvt. , Ottawa , Ontario , Canada . ; ; Tel: +1-613-562-5800 ext. 2119
| | - Derek A Pratt
- Department of Chemistry and Biomolecular Sciences , University of Ottawa , 10 Marie Curie Pvt. , Ottawa , Ontario , Canada . ; ; Tel: +1-613-562-5800 ext. 2119
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41
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Poon JF, Yan J, Singh VP, Gates PJ, Engman L. Alkyltelluro Substitution Improves the Radical-Trapping Capacity of Aromatic Amines. Chemistry 2016; 22:12891-903. [DOI: 10.1002/chem.201602377] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2016] [Indexed: 01/14/2023]
Affiliation(s)
- Jia-fei Poon
- 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
| | - Vijay P. Singh
- Department of Chemistry-BMC; Uppsala University, Box-576; 751 23 Uppsala Sweden
| | - Paul J. Gates
- University of Bristol; School of Chemistry; Bristol BS8 1TS UK
| | - Lars Engman
- Department of Chemistry-BMC; Uppsala University, Box-576; 751 23 Uppsala Sweden
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42
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Shah R, Pratt DA. Determination of Key Hydrocarbon Autoxidation Products by Fluorescence. J Org Chem 2016; 81:6649-56. [DOI: 10.1021/acs.joc.6b01032] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Affiliation(s)
- Ron Shah
- Department of Chemistry and
Biomolecular Sciences University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
| | - Derek A. Pratt
- Department of Chemistry and
Biomolecular Sciences University of Ottawa, Ottawa, Ontario K1N 6N5, Canada
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43
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Anstöter CS, West CW, Bull JN, Verlet JRR. The Vitamin E Radical Probed by Anion Photoelectron Imaging. J Phys Chem B 2016; 120:7108-13. [DOI: 10.1021/acs.jpcb.6b05271] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Cate S. Anstöter
- Department
of Chemistry, Durham University, Durham DH1 3LE, United Kingdom
| | | | - James N. Bull
- Department
of Chemistry, Durham University, Durham DH1 3LE, United Kingdom
| | - Jan R. R. Verlet
- Department
of Chemistry, Durham University, Durham DH1 3LE, United Kingdom
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44
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Amorati R, Baschieri A, Morroni G, Gambino R, Valgimigli L. Peroxyl Radical Reactions in Water Solution: A Gym for Proton-Coupled Electron-Transfer Theories. Chemistry 2016; 22:7924-34. [DOI: 10.1002/chem.201504492] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Indexed: 12/14/2022]
Affiliation(s)
- Riccardo Amorati
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
| | - Andrea Baschieri
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
| | - Gloria Morroni
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
| | - Rossana Gambino
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
| | - Luca Valgimigli
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
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45
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Kumar S, Yan J, Poon JF, Singh VP, Lu X, Karlsson Ott M, Engman L, Kumar S. Multifunctional Antioxidants: Regenerable Radical-Trapping and Hydroperoxide-Decomposing Ebselenols. Angew Chem Int Ed Engl 2016; 55:3729-33. [DOI: 10.1002/anie.201510947] [Citation(s) in RCA: 77] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2015] [Revised: 01/11/2016] [Indexed: 11/10/2022]
Affiliation(s)
- Shailesh Kumar
- Department of Chemistry; Indian Institute of Science Education and Research (IISER); Bhopal- 462066 India
| | - Jiajie Yan
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Jia-fei Poon
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Vijay P. Singh
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Xi Lu
- Division of Applied Materials Science; Department of Engineering Sciences; Uppsala University; Sweden
| | - Marjam Karlsson Ott
- Division of Applied Materials Science; Department of Engineering Sciences; Uppsala University; Sweden
| | - Lars Engman
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Sangit Kumar
- Department of Chemistry; Indian Institute of Science Education and Research (IISER); Bhopal- 462066 India
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46
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Kumar S, Yan J, Poon JF, Singh VP, Lu X, Karlsson Ott M, Engman L, Kumar S. Multifunctional Antioxidants: Regenerable Radical-Trapping and Hydroperoxide-Decomposing Ebselenols. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201510947] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Shailesh Kumar
- Department of Chemistry; Indian Institute of Science Education and Research (IISER); Bhopal- 462066 India
| | - Jiajie Yan
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Jia-fei Poon
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Vijay P. Singh
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Xi Lu
- Division of Applied Materials Science; Department of Engineering Sciences; Uppsala University; Sweden
| | - Marjam Karlsson Ott
- Division of Applied Materials Science; Department of Engineering Sciences; Uppsala University; Sweden
| | - Lars Engman
- Department of Chemistry-BMC; Uppsala University; Box-576 75123 Uppsala Sweden
| | - Sangit Kumar
- Department of Chemistry; Indian Institute of Science Education and Research (IISER); Bhopal- 462066 India
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47
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Mochizuki M, Nomura S, Inami K. Antioxidant Activity of Ascorbic Acid Analogs Containing a Nitrogen Atom in the Ring. HETEROCYCLES 2016. [DOI: 10.3987/com-16-13410] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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48
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Massaro M, Riela S, Guernelli S, Parisi F, Lazzara G, Baschieri A, Valgimigli L, Amorati R. A synergic nanoantioxidant based on covalently modified halloysite–trolox nanotubes with intra-lumen loaded quercetin. J Mater Chem B 2016; 4:2229-2241. [DOI: 10.1039/c6tb00126b] [Citation(s) in RCA: 62] [Impact Index Per Article: 7.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Synergic antioxidant activity was achieved by grafting α-tocopherol derivatives on halloysite nanotubes, and by loading quercetin in the inner lumen.
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Affiliation(s)
- Marina Massaro
- University of Palermo
- Department STEBICEF
- section Chemistry
- I-90128 Palermo
- Italy
| | - Serena Riela
- University of Palermo
- Department STEBICEF
- section Chemistry
- I-90128 Palermo
- Italy
| | - Susanna Guernelli
- University of Bologna
- Department of Chemistry “G. Ciamician”
- I-40126 Bologna
- Italy
| | - Filippo Parisi
- University of Palermo
- Department of Physic and Chemistry
- 90128 Palermo
- Italy
| | - Giuseppe Lazzara
- University of Palermo
- Department of Physic and Chemistry
- 90128 Palermo
- Italy
| | - Andrea Baschieri
- University of Bologna
- Department of Chemistry “G. Ciamician”
- I-40126 Bologna
- Italy
| | - Luca Valgimigli
- University of Bologna
- Department of Chemistry “G. Ciamician”
- I-40126 Bologna
- Italy
| | - Riccardo Amorati
- University of Bologna
- Department of Chemistry “G. Ciamician”
- I-40126 Bologna
- Italy
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49
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Mochizuki M, Nomura S, Inami K. Radical Scavenging Activity of Ascorbic Acid Analogs Containing a Carbonyl Conjugated Ene-Diol Structure. HETEROCYCLES 2016. [DOI: 10.3987/com-15-13366] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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50
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Salamone M, Bietti M. Tuning reactivity and selectivity in hydrogen atom transfer from aliphatic C-H bonds to alkoxyl radicals: role of structural and medium effects. Acc Chem Res 2015; 48:2895-903. [PMID: 26545103 DOI: 10.1021/acs.accounts.5b00348] [Citation(s) in RCA: 157] [Impact Index Per Article: 17.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Hydrogen atom transfer (HAT) is a fundamental reaction that takes part in a wide variety of chemical and biological processes, with relevant examples that include the action of antioxidants, damage to biomolecules and polymers, and enzymatic and biomimetic reactions. Moreover, great attention is currently devoted to the selective functionalization of unactivated aliphatic C-H bonds, where HAT based procedures have been shown to play an important role. In this Account, we describe the results of our recent studies on the role of structural and medium effects on HAT from aliphatic C-H bonds to the cumyloxyl radical (CumO(•)). Quantitative information on the reactivity and selectivity patterns observed in these reactions has been obtained by time-resolved kinetic studies, providing a deeper understanding of the factors that govern HAT from carbon and leading to the definition of useful guidelines for the activation or deactivation of aliphatic C-H bonds toward HAT. In keeping with the electrophilic character of alkoxyl radicals, polar effects can play an important role in the reactions of CumO(•). Electron-rich C-H bonds are activated whereas those that are α to electron withdrawing groups are deactivated toward HAT, with these effects being able to override the thermodynamic preference for HAT from the weakest C-H bond. Stereoelectronic effects can also influence the reactivity of the C-H bonds of ethers, amines, and amides. HAT is most rapid when these bonds can be eclipsed with a lone pair on an adjacent heteroatom or with the π-system of an amide functionality, thus allowing for optimal orbital overlap. In HAT from cyclohexane derivatives, tertiary axial C-H bond deactivation and tertiary equatorial C-H bond activation have been observed. These effects have been explained on the basis of an increase in torsional strain or a release in 1,3-diaxial strain in the HAT transition states, with kH(eq)/kH(ax) ratios that have been shown to exceed one order of magnitude. Medium effects on HAT from aliphatic C-H bonds to CumO(•) have been also investigated. With basic substrates, from large to very large decreases in kH have been measured with increasing solvent hydrogen bond donor (HBD) ability or after addition of protic acids or alkali and alkaline earth metal ions, with kinetic effects that exceed 2 orders of magnitude in the reactions of tertiary alkylamines and alkanamides. Solvent hydrogen bonding, protonation, and metal ion binding increase the electron deficiency and the strength of the C-H bonds of these substrates deactivating these bonds toward HAT, with the extent of this deactivation being modulated by varying the nature of the substrate, solvent, protic acid, and metal ion. These results indicate that through these interactions careful control over the HAT reactivity of basic substrates toward CumO(•) and other electrophilic radicals can be achieved, suggesting moreover that these effects can be exploited in an orthogonal fashion for selective C-H bond functionalization of substrates bearing different basic functionalities.
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Affiliation(s)
- Michela Salamone
- Dipartimento
di Scienze e
Tecnologie Chimiche, Università “Tor Vergata”, Via
della Ricerca Scientifica, 1, I-00133 Rome, Italy
| | - Massimo Bietti
- Dipartimento
di Scienze e
Tecnologie Chimiche, Università “Tor Vergata”, Via
della Ricerca Scientifica, 1, I-00133 Rome, Italy
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