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Lockhart S, Babu D, Tran NH, Reiz B, Tonoyan L, Siraki AG. The Interaction of Myeloperoxidase with the Industrial Contaminant 6-PPD: A Potential Pathway for Reactive Metabolites. Chem Res Toxicol 2024. [PMID: 39361003 DOI: 10.1021/acs.chemrestox.4c00265] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/05/2024]
Abstract
6-PPD (N-[1,3-dimethylbutyl]-N'-phenyl-p-phenylenediamine) is an industrial antioxidant reported to be an environmental contaminant. It was found to be highly toxic to coho salmon and potentially other aquatic organisms. The toxicity of 6-PPD in humans, however, remains unknown. The neutrophil enzyme myeloperoxidase (MPO) is known to catalyze xenobiotic metabolism; therefore, its role in 6-PPD cytotoxicity was investigated using the MPO-rich HL-60 cell line. UV-visible spectroscopy and liquid chromatography-mass spectrometry (LC/MS) were performed to investigate the MPO-mediated oxidation of 6-PPD and identify possible metabolites in the absence and presence of glutathione (GSH). 6-PPD's cytotoxicity, effect on mitochondrial membrane potential (MMP), and GSH-depleting ability in HL-60 cells were assessed. Electron paramagnetic resonance (EPR) was used to determine GSH radical formation using DMPO, and mitochondrial-derived superoxide was assessed with the mito-TEMPO-H probe. Evaluation of the 6-PPD-induced cellular injury pathways was performed by preincubating an antioxidant and an MPO inhibitor with HL-60 cells. UV-vis analysis of MPO-catalyzed oxidation of 6-PPD demonstrated changes in the 6-PPD spectrum, whereas the addition of GSH altered the spectrum, indicating possible GSH conjugate formation. LC/MS showed the formation of multiple products, including GSH-6-PPD conjugates and a GSH conjugate to a 4-hydroxydiphenylamine (a known 6-PPD degradant), which could potentially induce cytotoxicity. 6-PPD demonstrated concentration-dependent cytotoxicity, and cellular GSH levels were decreased by 6-PPD. Similarly, the level of MMP decreased, suggesting mitochondrial depolarization. Furthermore, the EPR spin probe for mitochondrial superoxide showed a positive relationship with 6-PPD concentration, and EPR spin-trapping demonstrated 6-PPD concentration-dependent GSH radical signal intensity using MPO/H2O2. The GSH precursor, NAC, demonstrated partial cytoprotection against 6-PPD; however, the MPO inhibitor PF-1355 surprisingly showed no significant cytoprotective effect. Our results suggest that MPO could be a potential catalyst for 6-PPD toxicity in humans. However, MPO inhibition did not significantly affect cellular viability, suggesting an MPO-independent toxicity pathway. These findings warrant a deeper investigation to determine 6-PPD mammalian toxicity pathways.
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Affiliation(s)
- Steven Lockhart
- Faculty of Pharmacy and Pharmaceutical Sciences, College of Health Sciences, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
- Applied Pharmaceutical Innovation, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - Dinesh Babu
- Faculty of Pharmacy and Pharmaceutical Sciences, College of Health Sciences, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - Newton H Tran
- Faculty of Pharmacy and Pharmaceutical Sciences, College of Health Sciences, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - Béla Reiz
- Department of Chemistry, Faculty of Sciences, College of Natural and Applied Sciences, University of Alberta, Edmonton, Alberta T6G 2G2, Canada
| | - Lusine Tonoyan
- Faculty of Pharmacy and Pharmaceutical Sciences, College of Health Sciences, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
- Applied Pharmaceutical Innovation, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
| | - Arno G Siraki
- Faculty of Pharmacy and Pharmaceutical Sciences, College of Health Sciences, University of Alberta, Edmonton, Alberta T6G 2R3, Canada
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2
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Wang H, Meng Y, Yang J, Huang H, Zhao Y, Zhu C, Wang C, Liu FW. Design, synthesis and antitumour activity of novel 5(6)-amino-benzimidazolequinones containing a fused morpholine. Eur J Med Chem 2022; 238:114420. [PMID: 35594653 DOI: 10.1016/j.ejmech.2022.114420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/24/2021] [Revised: 04/21/2022] [Accepted: 04/26/2022] [Indexed: 11/30/2022]
Abstract
Based on the previous synthesis of tetracyclic and tricyclic benzimidazoles starting from 1,4:3,6-dianhydro-d-fructose and o-phenylenediamines, a series of 5(6)-amino substituted tetracyclic and tricyclic benzimidazolequinones were obtained through the oxidation of 4,7-dimethoxy-benzimidazole analogues with bis(trifluoroacetoxy)iodobenzene (PIFA) and subsequent substitution with various aliphatic and aromatic amines. Biological evaluations of the target benzimidazolequinones indicated that all the arylamino-substituted benzimidazolequinones possess potent antitumour activity against human gastric cancer cells (MGC-803), especially compound a21-2. Furthermore, compound a21-2 inhibits gastric cancer cells proliferation and cell colony formation. Mechanistic investigations showed that compound a21-2 induces ROS production, which subsequently causes DNA damage and activation of ATM/Chk2, leading to G2/M phase arrest. ROS activates the c-Jun N-terminal kinase (JNK) pathway to induce mitochondrial-mediated apoptosis. In vivo studies showed that compound a21-2 inhibits the growth of tumours in nude mice without significant systemic toxicity. These findings suggest that compound a21-2 represents a promising candidate antitumour drug.
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Affiliation(s)
- Haixia Wang
- Institute of Pharmaceutical Research, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, China
| | - Yao Meng
- Institute of Pharmaceutical Research, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, China
| | - Jing Yang
- Institute of Pharmaceutical Research, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, China
| | - Hao Huang
- Institute of Pharmaceutical Research, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, China
| | - Yifan Zhao
- Institute of Pharmaceutical Research, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, China
| | - Chuantao Zhu
- Institute of Pharmaceutical Research, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, China
| | - Cong Wang
- Institute of Pharmaceutical Research, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, China; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China; State Key Laboratory of Esophageal Cancer Prevention and Treatment, Zhengzhou University, Zhengzhou, 450001, China.
| | - Feng-Wu Liu
- Institute of Pharmaceutical Research, School of Pharmaceutical Sciences, Zhengzhou University, Zhengzhou, 450001, China; Key Laboratory of Advanced Drug Preparation Technologies, Ministry of Education, Zhengzhou University, Zhengzhou, 450001, China; State Key Laboratory of Esophageal Cancer Prevention and Treatment, Zhengzhou University, Zhengzhou, 450001, China.
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3
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A Survey of Synthetic Routes and Antitumor Activities for Benzo[ g]quinoxaline-5,10-diones. Molecules 2020; 25:molecules25245922. [PMID: 33327601 PMCID: PMC7765027 DOI: 10.3390/molecules25245922] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2020] [Revised: 12/02/2020] [Accepted: 12/09/2020] [Indexed: 11/24/2022] Open
Abstract
Anthracycline antibiotics play an important role in cancer chemotherapy. The need to improve their therapeutic index has stimulated an ongoing search for anthracycline analogs with enhanced properties. This review aims to summarize the common synthetic approaches to benzo[g]quinoxaline-5,10-diones and their uses in heterocyclic chemistry. Because of the valuable biological activities of the 1,4-diazaanthraquinone compounds, a summary of the most promising heterocyclic quinones is provided together with their antitumor properties.
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4
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Conboy D, Mirallai SI, Craig A, McArdle P, Al-Kinani AA, Barton S, Aldabbagh F. Incorporating Morpholine and Oxetane into Benzimidazolequinone Antitumor Agents: The Discovery of 1,4,6,9-Tetramethoxyphenazine from Hydrogen Peroxide and Hydroiodic Acid-Mediated Oxidative Cyclizations. J Org Chem 2019; 84:9811-9818. [PMID: 31293163 DOI: 10.1021/acs.joc.9b01427] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Abstract
The reactivity of hydrogen peroxide and catalytic hydroiodic acid toward 3,6-dimethoxy-2-(cycloamino)anilines is tunable to give ring-fused benzimidazoles or 1,4,6,9-tetramethoxyphenazine in high yield. Mechanisms via a detected nitroso-intermediate are proposed for oxidative cyclization and the unexpected intermolecular displacement of the oxazine. An aqueous solution of molecular iodine is capable of the same transformations. Oxidative demethylation gave targeted benzimidazolequinones, including without cleavage of the incorporated oxetane.
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Affiliation(s)
- Darren Conboy
- Department of Pharmacy, School of Life Sciences, Pharmacy and Chemistry , Kingston University , Penrhyn Road , Kingston upon Thames KT1 2EE , U.K
| | - Styliana I Mirallai
- School of Chemistry , National University of Ireland Galway , University Road , Galway H91 TK33 , Ireland
| | - Austin Craig
- School of Chemistry , National University of Ireland Galway , University Road , Galway H91 TK33 , Ireland
| | - Patrick McArdle
- School of Chemistry , National University of Ireland Galway , University Road , Galway H91 TK33 , Ireland
| | - Ali A Al-Kinani
- Department of Pharmacy, School of Life Sciences, Pharmacy and Chemistry , Kingston University , Penrhyn Road , Kingston upon Thames KT1 2EE , U.K
| | - Stephen Barton
- Department of Pharmacy, School of Life Sciences, Pharmacy and Chemistry , Kingston University , Penrhyn Road , Kingston upon Thames KT1 2EE , U.K
| | - Fawaz Aldabbagh
- Department of Pharmacy, School of Life Sciences, Pharmacy and Chemistry , Kingston University , Penrhyn Road , Kingston upon Thames KT1 2EE , U.K.,School of Chemistry , National University of Ireland Galway , University Road , Galway H91 TK33 , Ireland
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5
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He M, Yi QY, Zhang WY, Bai L, Du F, Gu YY, Liu YJ, Wei P. Evaluation of anticancer activity in vitro and in vivo of iridium(iii) polypyridyl complexes. NEW J CHEM 2019. [DOI: 10.1039/c9nj01001g] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Abstract
Three new iridium(iii) polypyridyl complexes were synthesized. The cytotoxic activity in vitro and in vivo, apoptosis, cell cycle arrest, mitochondrial membrane potential, ROS and the expression of Bcl-2 family proteins were investigated.
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Affiliation(s)
- Miao He
- School of Pharmacy
- Guangdong Pharmaceutical University
- Guangzhou
- P. R. China
| | - Qiao-Yan Yi
- School of Pharmacy
- Guangdong Pharmaceutical University
- Guangzhou
- P. R. China
| | - Wen-Yao Zhang
- School of Pharmacy
- Guangdong Pharmaceutical University
- Guangzhou
- P. R. China
| | - Lan Bai
- School of Pharmacy
- Guangdong Pharmaceutical University
- Guangzhou
- P. R. China
| | - Fan Du
- School of Pharmacy
- Guangdong Pharmaceutical University
- Guangzhou
- P. R. China
| | - Yi-Ying Gu
- School of Pharmacy
- Guangdong Pharmaceutical University
- Guangzhou
- P. R. China
| | - Yun-Jun Liu
- School of Pharmacy
- Guangdong Pharmaceutical University
- Guangzhou
- P. R. China
- Guangdong Engineering Research Center for Lead Compounds & Drug Discovery
| | - Peng Wei
- School of Bioscience and Biopharmaceutics
- Guangdong Pharmaceutical University
- Guangzhou
- P. R. China
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6
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Tung J, Tew LS, Coluccini C, Lin YD, Khung YL. Grafting Behavior for the Resonating Variants of Ethynylaniline on Hydrogenated Silicon (100) Surfaces under Thermal Hydrosilylation. Chemistry 2018; 24:13270-13277. [PMID: 29932257 DOI: 10.1002/chem.201802003] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2018] [Revised: 06/20/2018] [Indexed: 11/09/2022]
Abstract
This work reports the outcome of thermal grafting of 2-ethynylaniline, 3-ethynylaniline, and 4-ethynylaniline on a hydrogenated Si(100) surface. Using high-resolution XPS and AFM, it was found that the grafting of these compounds could be attributed to resonating structures that arise from the position of an electron-donating NH2 group and an electron-withdrawing acetylene group. For the ortho- and para-positioned acetylene group, surface reactions were observed to proceed predominantly via the acetylene to form a Si-C bond, whereas the meta-positioned acetylene group was found to have undergone nucleophilic grafting through the NH2 group onto the silicon surface to form a Si-N bond. Furthermore, a tert-butoxycarbonyl-protected derivative for a meta-positioned ethynylaniline was synthesized to exclusively force the reaction to react with the acetylene group and subsequent analysis confirmed that unprotected 3-ethynylaniline had indeed reacted through the nucleophilic NH2 group as hypothesized. Thus, for the first time, the interplay between resonance structures and their effects on silicon surface modifications were systematically catalogued.
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Affiliation(s)
- Joline Tung
- College of Arts and Sciences, University of North Carolina at Chapel Hill (UNC), Chapel Hill, NC, 27514, USA
| | - Lih Shin Tew
- Advanced Medical and Dental Institute (AMDI), Universiti Sains Malaysia, 13200, Kepala Batas Pulau Pinang, Malaysia
| | - Carmine Coluccini
- Institute of New Drug Development, China Medical University, No.91 Hsueh-Shih Road, Taichung, Taiwan
| | - Yue-Der Lin
- Department of Automatic Control Engineering, Feng Chia University, No. 100, Wenhwa Rd., Seatwen, Taichung, Taiwan
| | - Yit Lung Khung
- Department of Biological Science and Technology, China Medical University, No.91 Hsueh-Shih Road, Taichung, Taiwan
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7
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Raja Lakshmi P, Manivannan R, Jayasudha P, Elango KP. Multispectroscopic and theoretical studies on rapid, selective and sensitive visual sensing of cyanide ion in aqueous solution by receptors possessing varying HBD property. RESEARCH ON CHEMICAL INTERMEDIATES 2018. [DOI: 10.1007/s11164-018-3262-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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8
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1-Fluoro-2,5-dimethoxy-4-nitrobenzene. MOLBANK 2018. [DOI: 10.3390/m984] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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9
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Quiñonero D. Sigma-hole carbon-bonding interactions in carbon-carbon double bonds: an unnoticed contact. Phys Chem Chem Phys 2018; 19:15530-15540. [PMID: 28581553 DOI: 10.1039/c7cp01780d] [Citation(s) in RCA: 24] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this manuscript, we combine high-level ab initio calculations on some small complexes and a CSD survey to analyze the existence of unprecedented noncovalent carbon bonds in X2C[double bond, length as m-dash]CH2Y systems (Y = electron-rich atom or group). The methylene group is usually seen as a weak hydrogen bond donor when interacting with an electron-rich atom. However, we demonstrate that when the electron-rich atom is located equidistant from the two H atoms and along the C[double bond, length as m-dash]C bond a σ-hole noncovalent carbon-bonding interaction is established, instead of a bifurcated hydrogen bond, as derived from Atoms-in-Molecules (AIM) and Natural bond orbital (NBO) analyses. The physical nature of the interaction has been analyzed using the Symmetry Adapted Perturbation Theory (SAPT) method. The results indicate that electrostatics is very important followed by either the induction or dispersion terms in anionic and neutral complexes, respectively. In addition the CSD analysis reveals the existence of such interactions, giving reliability to our calculations, which are much more numerous for neutral than for anionic Y systems.
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Affiliation(s)
- D Quiñonero
- Department de Química, Universitat de les Illes Balears, Crta. Valldemossa km 7.5, 07122 Palma de Mallorca, Spain.
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10
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Godde B, Ritaine D, Jouaiti A, Mauro M, Hosseini MW. A pyridyl-benzimidazole based molecular luminescent turnstile. NEW J CHEM 2018. [DOI: 10.1039/c8nj00890f] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
A molecular turnstile based on a luminescent pyridyl-benzimidazole stator and a rotor containing a pyridyl coordinating site may be reversibily switched between its open and closed states upon binding/unbinding of silver cations.
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Affiliation(s)
- Bérangère Godde
- Molecular Tectonics Laboratory
- UMR UdS-CNRS 7140
- University of Strasbourg
- Institut Le Bel
- F-67000 Strasbourg
| | - Dialia Ritaine
- Molecular Tectonics Laboratory
- UMR UdS-CNRS 7140
- University of Strasbourg
- Institut Le Bel
- F-67000 Strasbourg
| | - Abdelaziz Jouaiti
- Molecular Tectonics Laboratory
- UMR UdS-CNRS 7140
- University of Strasbourg
- Institut Le Bel
- F-67000 Strasbourg
| | - Matteo Mauro
- Molecular Tectonics Laboratory
- UMR UdS-CNRS 7140
- University of Strasbourg
- Institut Le Bel
- F-67000 Strasbourg
| | - Mir Wais Hosseini
- Molecular Tectonics Laboratory
- UMR UdS-CNRS 7140
- University of Strasbourg
- Institut Le Bel
- F-67000 Strasbourg
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11
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A comparative study of the electronic spectra, fluorescence quantum yields, cyclic voltammograms and theoretical calculations of phenanthrene-type benzodifurans. Tetrahedron 2016. [DOI: 10.1016/j.tet.2016.05.019] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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12
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Kolmer-Anderl N, Kolmer A, Thiele CM, Rehahn M. Exploration of the Photodegradation of Naphtho[2,3-g
] quinoxalines and Pyrazino[2,3-b
]phenazines. Chemistry 2016; 22:5277-87. [PMID: 26918505 DOI: 10.1002/chem.201504453] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/05/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Nicole Kolmer-Anderl
- Ernst-Berl-Institut für Technische und Makromolekulare Chemie; Technische Universität Darmstadt; Alarich-Weiss-Straße 4 64287 Darmstadt Germany
| | - Andreas Kolmer
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie; Technische Universität Darmstadt; Alarich-Weiss-Straße 4 64287 Darmstadt Germany
| | - Christina M. Thiele
- Clemens-Schöpf-Institut für Organische Chemie und Biochemie; Technische Universität Darmstadt; Alarich-Weiss-Straße 4 64287 Darmstadt Germany
| | - Matthias Rehahn
- Ernst-Berl-Institut für Technische und Makromolekulare Chemie; Technische Universität Darmstadt; Alarich-Weiss-Straße 4 64287 Darmstadt Germany
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13
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Ruthenium(II) polypyridyl complexes induce BEL-7402 cell apoptosis by ROS-mediated mitochondrial pathway. J Inorg Biochem 2014; 141:170-179. [DOI: 10.1016/j.jinorgbio.2014.09.001] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/24/2014] [Revised: 09/03/2014] [Accepted: 09/03/2014] [Indexed: 12/17/2022]
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14
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Funel JA, Brodbeck S, Guggisberg Y, Litjens R, Seidel T, Struijk M, Abele S. Diastereospecific Enolate Addition and Atom-Efficient Benzimidazole Synthesis for the Production of L/T Calcium Channel Blocker ACT-280778. Org Process Res Dev 2014. [DOI: 10.1021/op400269b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Jacques-Alexis Funel
- Process
Research Chemistry, Actelion Pharmaceuticals Ltd., Gewerbestrasse
16, CH-4123 Allschwil, Switzerland
| | - Stephan Brodbeck
- Technical
Operations, Drug Substance, Actelion Pharmaceuticals Ltd., Gewerbestrasse 16, CH−4123 Allschwil, Switzerland
| | | | - Remy Litjens
- CML Europe BV, Vliesvenweg
1, P.O. Box 8, Weert, The Netherlands
| | - Thomas Seidel
- Valsynthese SA, Fabrikstrasse 48, CH-3900 Brig, Switzerland
| | - Martin Struijk
- CML Europe BV, Vliesvenweg
1, P.O. Box 8, Weert, The Netherlands
| | - Stefan Abele
- Process
Research Chemistry, Actelion Pharmaceuticals Ltd., Gewerbestrasse
16, CH-4123 Allschwil, Switzerland
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15
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Bauzá A, Deyà PM, Frontera A, Quiñonero D. Substituent effects in cation–π interactions revisited: a general approach based on intrinsic properties of the arenes. Phys Chem Chem Phys 2014; 16:1322-6. [DOI: 10.1039/c3cp54147a] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
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16
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Wu W, Lu Y, Liu Y, Li H, Peng C, Liu H, Zhu W. Weak energetic effects between X–π and X–N halogen bonds: CSD search and theoretical study. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.07.048] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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17
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Bauzá A, Quiñonero D, Deyà PM, Frontera A. Quadrupole moment versus Molecular Electrostatic Potential: Strange behavior of ethynyl-substituted benzenes. Chem Phys Lett 2013. [DOI: 10.1016/j.cplett.2013.02.064] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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18
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Frontera A, Quiñonero D, Deyà PM. Cation-π and anion-π interactions. WILEY INTERDISCIPLINARY REVIEWS-COMPUTATIONAL MOLECULAR SCIENCE 2011. [DOI: 10.1002/wcms.14] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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19
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20
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Blackburn OA, Coe BJ, Futhey R, Helliwell M. 1,4-Di- n-heptyloxy-2,5-dinitrobenzene. Acta Crystallogr Sect E Struct Rep Online 2010; 66:o36. [PMID: 21580141 PMCID: PMC2980120 DOI: 10.1107/s160053680905123x] [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: 11/20/2009] [Accepted: 11/27/2009] [Indexed: 11/17/2022]
Abstract
The complete molecule of the title compound, C20H32N2O6, is generated by crystallographic inversion symmetry. The two mutually trans nitro substituents are hence in fully eclipsed conformation and also twisted by 43.2 (2)° with respect to the phenyl ring plane. The benzene-connected portions of the alkoxy substituents lie almost coplanar with the ring [C—O—C—C torsion angle = 2.0 (2)°]. In the crystal, weak C—H⋯O interactions link the molecules.
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21
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Singh S, de Tacconi NR, Boston D, MacDonnell FM. Photoinduced ligand transformations in a ruthenium complex of dimethoxytetrapyridotetraazapentacene. Dalton Trans 2010; 39:11180-7. [DOI: 10.1039/c0dt00982b] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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22
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Lucas X, Frontera A, Quiñonero D, Deyà PM. Substituent Effects in Ion−π Interactions: Fine-Tuning via the Ethynyl Group. J Phys Chem A 2009; 114:1926-30. [DOI: 10.1021/jp9089672] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xavier Lucas
- Departament de Química, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
| | - David Quiñonero
- Departament de Química, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
| | - Pere M. Deyà
- Departament de Química, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
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23
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Lucas X, Quiñonero D, Frontera A, Deyà PM. Counterintuitive Substituent Effect of the Ethynyl Group in Ion−π Interactions. J Phys Chem A 2009; 113:10367-75. [DOI: 10.1021/jp905701p] [Citation(s) in RCA: 41] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Xavier Lucas
- Departament de Química, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
| | - David Quiñonero
- Departament de Química, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
| | - Antonio Frontera
- Departament de Química, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
| | - Pere M. Deyà
- Departament de Química, Universitat de les Illes Balears, E-07122 Palma de Mallorca, Spain
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24
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Nasiri HR, Panisch R, Madej MG, Bats JW, Lancaster CRD, Schwalbe H. The correlation of cathodic peak potentials of vitamin K(3) derivatives and their calculated electron affinities. The role of hydrogen bonding and conformational changes. BIOCHIMICA ET BIOPHYSICA ACTA-BIOENERGETICS 2009; 1787:601-8. [PMID: 19265668 DOI: 10.1016/j.bbabio.2009.02.013] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/12/2008] [Revised: 02/16/2009] [Accepted: 02/17/2009] [Indexed: 11/25/2022]
Abstract
2-methyl-1,4-naphtoquinone 1 (vitamin K(3), menadione) derivatives with different substituents at the 3-position were synthesized to tune their electrochemical properties. The thermodynamic midpoint potential (E(1/2)) of the naphthoquinone derivatives yielding a semi radical naphthoquinone anion were measured by cyclic voltammetry in the aprotic solvent dimethoxyethane (DME). Using quantum chemical methods, a clear correlation was found between the thermodynamic midpoint potentials and the calculated electron affinities (E(A)). Comparison of calculated and experimental values allowed delineation of additional factors such as the conformational dependence of quinone substituents and hydrogen bonding which can influence the electron affinities (E(A)) of the quinone. This information can be used as a model to gain insight into enzyme-cofactor interactions, particularly for enzyme quinone binding modes and the electrochemical adjustment of the quinone motif.
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Affiliation(s)
- Hamid Reza Nasiri
- Institute of Organic Chemistry and Chemical Biology, Johann Wolfgang Goethe-University Frankfurt, Max-von-Laue-Str. 7, D-60438 Frankfurt am Main, Germany
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Morin C, Besset T, Moutet JC, Fayolle M, Brückner M, Limosin D, Becker K, Davioud-Charvet E. The aza-analogues of 1,4-naphthoquinones are potent substrates and inhibitors of plasmodial thioredoxin and glutathione reductases and of human erythrocyte glutathione reductase. Org Biomol Chem 2008; 6:2731-42. [DOI: 10.1039/b802649c] [Citation(s) in RCA: 52] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Chinchilla R, Najera C. The Sonogashira Reaction: A Booming Methodology in Synthetic Organic Chemistry. Chem Rev 2007; 107:874-922. [PMID: 17305399 DOI: 10.1021/cr050992x] [Citation(s) in RCA: 2269] [Impact Index Per Article: 133.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Rafael Chinchilla
- Departamento de Química Orgánica and Instituto de Síntesis Orgánica (ISO), Universidad de Alicante, Facultad de Ciencias, Apartado 99, 03080 Alicante, Spain.
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