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Luo X, Wang X, Xia C, Peng J, Wang Y, Tang Y, Gao F. Quantitative ion character-activity relationship methods for assessing the ecotoxicity of soil metal(loid)s to lettuce. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:24521-24532. [PMID: 36336735 DOI: 10.1007/s11356-022-23914-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/28/2022] [Accepted: 10/26/2022] [Indexed: 06/16/2023]
Abstract
New pollution elements introduced by the rapid development of modern industry and agriculture may pose a serious threat to the soil ecosystem. To explore the ecotoxicity and risk of these elements, we systematically studied the acute toxicity of 18 metal(loid)s toward lettuce using hydroponic experiments and quantitative relationships between element toxicity and ionic characteristics using ion-grouping and ligand-binding theory methods, thereby establishing a quantitative ion character-activity relationship (QICAR) model for predicting the phytotoxicity threshold of data-poor elements. The toxicity of 18 ions to lettuce differed by more than four orders of magnitude (0.05-804.44 μM). Correlation and linear regression analysis showed that the ionic characteristics significantly associated with this toxicity explained only 23.8-50.3% of the toxicity variation (R2Adj = 0.238-0.503, p < 0.05). Relationships between toxicity and ionic properties significantly improved after separating metal(loid) ions into soft and hard, with R2Adj of 0.793 and 0.784 (p < 0.05), respectively. Three ligand-binding parameters showed different predictive effects on lettuce metal(loid) toxicity. Compared with the binding constant of the biotic ligand model (log K) and the hard ligand scale (HLScale) (p > 0.05), the softness consensus scale (σCon) was significantly correlated with toxicity and provided the best prediction (R2Adj = 0.844, p < 0.001). We selected QICAR equations based on soft-hard ion classification and σCon methods to predict phytotoxicity of metal(loid)s, which can be used to derive ecotoxicity for data-poor metal(loid)s, providing preliminary assessment of their ecological risks.
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Affiliation(s)
- Xiaorong Luo
- College of Resource Environment and Tourism, Capital Normal University, Beijing, 100048, China
| | - Xuedong Wang
- College of Resource Environment and Tourism, Capital Normal University, Beijing, 100048, China.
| | - Cunyan Xia
- College of Resource Environment and Tourism, Capital Normal University, Beijing, 100048, China
| | - Jing Peng
- College of Resource Environment and Tourism, Capital Normal University, Beijing, 100048, China
| | - Ying Wang
- School of Space and Environment, Beihang University, Beijing, 100191, China
| | - Yujie Tang
- College of Resource Environment and Tourism, Capital Normal University, Beijing, 100048, China
| | - Fan Gao
- College of Resource Environment and Tourism, Capital Normal University, Beijing, 100048, China
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Potential of HF and CO2 loss through dissociative electron attachment to increase radiosensitizers reactivity; case study on pentafluorobenzoic acid. Radiat Phys Chem Oxf Engl 1993 2022. [DOI: 10.1016/j.radphyschem.2022.110544] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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Dobrowolski JC, Dudek WM, Karpińska G, Baraniak A. Substituent Effect in the Cation Radicals of Monosubstituted Benzenes. Int J Mol Sci 2021; 22:6936. [PMID: 34203254 PMCID: PMC8269098 DOI: 10.3390/ijms22136936] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/17/2021] [Revised: 06/19/2021] [Accepted: 06/22/2021] [Indexed: 01/30/2023] Open
Abstract
In 30 monosubstituted benzene cation radicals, studied at the ωB97XD/aug-cc-pVTZ level, the phenyl rings usually adopt a compressed form, but a differently compressed form-equivalent to an elongated one-may coexist. The computational and literature ionization potentials are well correlated. The geometrical and magnetic aromaticity, estimated using HOMA and NICS indices, show the systems to be structurally aromatic but magnetically antiaromatic or only weakly aromatic. The partial charge is split between the substituent and ring and varies the most at C(ipso). In the ring, the spin is 70%, concentrated equally at the C(ipso) and C(p) atoms. The sEDA(D) and pEDA(D) descriptors of the substituent effect in cation radicals, respectively, were determined. In cation radicals, the substituent effect on the σ-electron system is like that in the ground state. The effect on the π-electron systems is long-range, and its propagation in the radical quinone-like ring is unlike that in the neutral molecules. The pEDA(D) descriptor correlates well with the partial spin at C(ipso) and C(p) and weakly with the HOMA(D) index. The correlation of the spin at the ring π-electron system and the pEDA(D) descriptor shows that the electron charge supplied to the ring π-electron system and the spin flow oppositely.
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Affiliation(s)
- Jan Cz. Dobrowolski
- National Medicines Institute, 00-725 Warsaw, Poland; (G.K.); (A.B.)
- Institute of Nuclear Chemistry and Technology, 03-195 Warsaw, Poland;
| | - Wojciech M. Dudek
- Institute of Nuclear Chemistry and Technology, 03-195 Warsaw, Poland;
| | | | - Anna Baraniak
- National Medicines Institute, 00-725 Warsaw, Poland; (G.K.); (A.B.)
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Tandon H, Ranjan P, Chakraborty T, Suhag V. Polarizability: a promising descriptor to study chemical-biological interactions. Mol Divers 2020; 25:249-262. [PMID: 32146657 DOI: 10.1007/s11030-020-10062-w] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2019] [Accepted: 02/26/2020] [Indexed: 11/24/2022]
Abstract
Recently, we have defined atomic polarizability, a Conceptual Density Functional Theory (CDFT)-based reactivity descriptor, through an empirical method. Though the method is empirical, it is competent enough to meet the criteria of periodic descriptors and exhibit relativistic effect. Since the atomic data are very accurate, we have applied them to determine molecular polarizability. Molecular polarizability is an electronic parameter and has an impact on chemical-biological interactions. Thus, it plays a pivotal role in explaining such interactions through Structure Activity Relationships (SAR). In the present work, we have explored the application of polarizability in the real field through investigation of chemical-biological interactions in terms of molecular polarizability. A Quantitative Structure-Activity Relationship (QSAR) model is constructed to account for electronic effects owing to polarizability in ligand-substrate interactions. The study involves the prediction of various biological activities in terms of minimum block concentration, relative biological response, inhibitory growth concentration or binding affinity. Superior results are presented for the predicted and observed activities which support the accuracy of the proposed polarizability-QSAR model. Further, the results are considered from a biological viewpoint in order to understand the mechanism of interactions. The study is performed to explore the efficacy of the computational model based on newly proposed polarizability and not to establish the finest QSAR. For future studies, it is suggested that the descriptor polarizability should be contrasted with the use of other drug-like descriptors.
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Affiliation(s)
- Hiteshi Tandon
- Department of Chemistry, Manipal University Jaipur, Jaipur, 300307, Rajasthan, India
| | - Prabhat Ranjan
- Department of Mechatronics Engineering, Manipal University Jaipur, Jaipur, 300307, Rajasthan, India
| | - Tanmoy Chakraborty
- Department of Chemistry, School of Engineering, Presidency University, Bengaluru, 560064, Karnataka, India.
| | - Vandana Suhag
- Department of Applied Sciences, BML Munjal University, Gurugram, 122413, Haryana, India
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Molecular Insights into Potential Contributions of Natural Polyphenols to Lung Cancer Treatment. Cancers (Basel) 2019; 11:cancers11101565. [PMID: 31618955 PMCID: PMC6826534 DOI: 10.3390/cancers11101565] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2019] [Revised: 10/13/2019] [Accepted: 10/13/2019] [Indexed: 12/12/2022] Open
Abstract
Naturally occurring polyphenols are believed to have beneficial effects in the prevention and treatment of a myriad of disorders due to their anti-inflammatory, antioxidant, antineoplastic, cytotoxic, and immunomodulatory activities documented in a large body of literature. In the era of molecular medicine and targeted therapy, there is a growing interest in characterizing the molecular mechanisms by which polyphenol compounds interact with multiple protein targets and signaling pathways that regulate key cellular processes under both normal and pathological conditions. Numerous studies suggest that natural polyphenols have chemopreventive and/or chemotherapeutic properties against different types of cancer by acting through different molecular mechanisms. The present review summarizes recent preclinical studies on the applications of bioactive polyphenols in lung cancer therapy, with an emphasis on the molecular mechanisms that underlie the therapeutic effects of major polyphenols on lung cancer. We also discuss the potential of the polyphenol-based combination therapy as an attractive therapeutic strategy against lung cancer.
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Mártire DO, Gonzalez MC. Aqueous Phase Kinetic Studies Involving Intermediates of Environmental Interest: Phosphate Radicals and Their Reactions with Substituted Benzenes. PROGRESS IN REACTION KINETICS AND MECHANISM 2019. [DOI: 10.3184/007967401103165253] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
This manuscript describes our research work devoted to the understanding of the aqueous phase reactions of phosphate and polyphosphate radicals. Inorganic phosphate and polyphosphate radicals were generated after photolysis of peroxo-diphosphate, tripolyphosphate and pyrophosphate ions. The reactions of SO4•-radicals with P2O74- and P3O105- are also discussed. The logarithm of the bimolecular rate constants for the reactions of the three phosphate radicals (H2PO4• HPO4•- PO4•2-) with substituted benzenes are discussed in terms of Hammett correlations and a reaction mechanism is proposed. Phenoxyl type radical formation from the reactions of H2PO4• and HPO4•- radicals with phenol, chlorobenzene, and α, α, α-trifluorotoluene (TFT) supports the contribution of an addition pathway yielding a phosphate adduct with the substituted benzene. Additional information on the absorption spectra and decay kinetics of the hydroxycyclohexadienyl radicals of chlorobenzene and TFT is also given.
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Affiliation(s)
- Daniel O. Mártire
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, (1900) La Plata, Argentina
| | - Mónica C. Gonzalez
- Instituto de Investigaciones Fisicoquímicas Teóricas y Aplicadas (INIFTA), Facultad de Ciencias Exactas, Universidad Nacional de La Plata, Casilla de Correo 16, Sucursal 4, (1900) La Plata, Argentina
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Flores JA, Andino JG, Lord RL, Wolfe RJ, Park H, Pink M, Telser J, Caulton KG. Probing Redox Noninnocence of Copper and Zinc Bis‐pyridylpyrrolides. Eur J Inorg Chem 2018. [DOI: 10.1002/ejic.201800935] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Jaime A. Flores
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 USA Bloomington Indiana47405 USA
| | - José G. Andino
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 USA Bloomington Indiana47405 USA
| | - Richard L. Lord
- Department of Chemistry Grand Valley State University 49401 Allendale Michigan USA
| | - Robert J. Wolfe
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 USA Bloomington Indiana47405 USA
| | - Hyunsoo Park
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 USA Bloomington Indiana47405 USA
| | - Maren Pink
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 USA Bloomington Indiana47405 USA
| | - Joshua Telser
- Department of Biological Physical and Health Sciences Roosevelt University 430 South Michigan Avenue 60605 Chicago Illinois USA
| | - Kenneth G. Caulton
- Department of Chemistry Indiana University 800 East Kirkwood Avenue 47405 USA Bloomington Indiana47405 USA
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Dutta I, Yadav S, Sarbajna A, De S, Hölscher M, Leitner W, Bera JK. Double Dehydrogenation of Primary Amines to Nitriles by a Ruthenium Complex Featuring Pyrazole Functionality. J Am Chem Soc 2018; 140:8662-8666. [DOI: 10.1021/jacs.8b05009] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
Affiliation(s)
- Indranil Dutta
- Department of Chemistry and Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Sudhir Yadav
- Department of Chemistry and Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Abir Sarbajna
- Department of Chemistry and Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Subhabrata De
- Department of Chemistry and Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
| | - Markus Hölscher
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Worringerweg 2, 52074 Aachen, Germany
| | - Walter Leitner
- Institut für Technische und Makromolekulare Chemie, RWTH Aachen University, Worringerweg 2, 52074 Aachen, Germany
- Max Planck Institute for Chemical Energy Conversion, Stiftstraße 34-36, 45470 Mülheim an der Ruhr, Germany
| | - Jitendra K. Bera
- Department of Chemistry and Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016, India
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Maier GP, Bernt CM, Butler A. Catechol oxidation: considerations in the design of wet adhesive materials. Biomater Sci 2018; 6:332-339. [DOI: 10.1039/c7bm00884h] [Citation(s) in RCA: 49] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electron-withdrawing substituents slow the rate of oxidation of substituted catechols by O2: a Hammett analysis.
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Affiliation(s)
- Greg P. Maier
- Department of Chemistry and Biochemistry
- University of California
- Santa Barbara
- USA
| | - Christopher M. Bernt
- Department of Chemistry and Biochemistry
- University of California
- Santa Barbara
- USA
| | - Alison Butler
- Department of Chemistry and Biochemistry
- University of California
- Santa Barbara
- USA
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10
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Negritto MC, Valdez C, Sharma J, Rosenberg C, Selassie CR. Growth Inhibition and DNA Damage Induced by X-Phenols in Yeast: A Quantitative Structure-Activity Relationship Study. ACS OMEGA 2017; 2:8568-8579. [PMID: 29302629 PMCID: PMC5748281 DOI: 10.1021/acsomega.7b01200] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/17/2017] [Accepted: 11/14/2017] [Indexed: 05/07/2023]
Abstract
Phenolic compounds and their derivatives are ubiquitous constituents of numerous synthetic and natural chemicals that exist in the environment. Their toxicity is mostly attributed to their hydrophobicity and/or the formation of free radicals. In a continuation of the study of phenolic toxicity in a systematic manner, we have examined the biological responses of Saccharomyces cerevisiae to a series of mostly monosubstituted phenols utilizing a quantitative structure-activity relationship (QSAR) approach. The biological end points included a growth assay that determines the levels of growth inhibition induced by the phenols as well as a yeast deletion (DEL) assay that assesses the ability of X-phenols to induce DNA damage or DNA breaks. The QSAR analysis of cell growth patterns determined by IC50 and IC80 values indicates that toxicity is delineated by a hydrophobic, parabolic model. The DEL assay was then utilized to detect genomic deletions in yeast. The increase in the genotoxicity was enhanced by the electrophilicity of the phenolic substituents that were strong electron donors as well as by minimal hydrophobicity. The electrophilicities are represented by Brown's sigma plus values that are a variant of the Hammett sigma constants. A few mutant strains of genes involved in DNA repair were separately exposed to 2,6-di-tert-butyl-4-methyl-phenol (BHT) and butylated hydroxy anisole (BHA). They were subsequently screened for growth phenotypes. BHA-induced growth defects in most of the DNA repair null mutant strains, whereas BHT was unresponsive.
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Affiliation(s)
- M. Cristina Negritto
- Molecular
Biology Program, Department of Biology/Department of Chemistry, Pomona College, 175 West 6th Street, Claremont, California 91711, United States
| | - Clarissa Valdez
- Molecular
Biology Program, Department of Biology/Department of Chemistry, Pomona College, 175 West 6th Street, Claremont, California 91711, United States
| | - Jasmine Sharma
- Molecular
Biology Program, Department of Biology/Department of Chemistry, Pomona College, 175 West 6th Street, Claremont, California 91711, United States
| | - Christa Rosenberg
- Chemistry
Department, Pomona College, 645 North College Avenue, Claremont, California 91711, United States
| | - Cynthia R. Selassie
- Chemistry
Department, Pomona College, 645 North College Avenue, Claremont, California 91711, United States
- E-mail: (C.R.S.)
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Farmer LA, Haidasz EA, Griesser M, Pratt DA. Phenoxazine: A Privileged Scaffold for Radical-Trapping Antioxidants. J Org Chem 2017; 82:10523-10536. [PMID: 28885854 DOI: 10.1021/acs.joc.7b02025] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Diphenylamines are widely used to protect petroleum-derived products from autoxidation. Their efficacy as radical-trapping antioxidants (RTAs) relies on a balance of fast H-atom transfer kinetics and stability to one-electron oxidation by peroxidic species. Both H-atom transfer and one-electron oxidation are enhanced by substitution with electron-donating substituents, such as the S-atom in phenothiazines, another important class of RTA. Herein we report the results of our investigations of the RTA activity of the structurally related, but essentially ignored, phenoxazines. We find that the H-atom transfer reactivity of substituted phenoxazines follows an excellent Evans-Polanyi correlation spanning kinh = 4.5 × 106 M-1 s-1 and N-H BDE = 77.4 kcal mol-1 for 3-CN,7-NO2-phenoxazine to kinh = 6.6 × 108 M-1 s-1 and N-H BDE = 71.8 kcal mol-1 for 3,7-(OMe)2-phenoxazine (37 °C). The reactivity of the latter compound is the greatest of any RTA ever reported and is likely to represent a reaction without an enthalpic barrier since log A for this reaction is likely ∼8.5. The very high reactivity of most of the phenoxazines studied required the determination of their kinetic parameters by inhibited autoxidations in the presence of a very strong H-bonding cosolvent (DMSO), which slowed the observed rates by up to 2 orders of magnitude by dynamically reducing the equilibrium concentration of (free) phenoxazine as an H-atom donor. Despite their remarkably high reactivity toward peroxyl radicals, the phenoxazines were found to be comparatively stable to one-electron oxidation relative to diphenylamines and phenothiazines (E° ranging from 0.59 to 1.38 V vs NHE). Thus, phenoxazines with comparable oxidative stability to commonly used diphenylamine and phenothiazine RTAs had significantly greater reactivity (by up to 2 orders of magnitude). Computations suggest that this remarkable balance in H-atom transfer kinetics and stability to one-electron oxidation results from the ability of the bridging oxygen atom in phenoxazine to serve as both a π-electron donor to stabilize the aminyl radical and σ-electron acceptor to destabilize the aminyl radical cation. Perhaps most excitingly, phenoxazines have "non-classical" RTA activity, where they trap >2 peroxyl radicals each, at ambient temperatures.
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Affiliation(s)
- Luke A Farmer
- Department of Chemistry and Biomolecular Sciences, University of Ottawa , 10 Marie Curie Pvt., Ottawa, Canada
| | - Evan A Haidasz
- Department of Chemistry and Biomolecular Sciences, University of Ottawa , 10 Marie Curie Pvt., Ottawa, Canada
| | - Markus Griesser
- Department of Chemistry and Biomolecular Sciences, University of Ottawa , 10 Marie Curie Pvt., Ottawa, Canada
| | - Derek A Pratt
- Department of Chemistry and Biomolecular Sciences, University of Ottawa , 10 Marie Curie Pvt., Ottawa, Canada
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Varaksin KS, Szatylowicz H, Krygowski TM. Towards a physical interpretation of substituent effect: Quantum chemical interpretation of Hammett substituent constants. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.02.074] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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Singh K, Sarbajna A, Dutta I, Pandey P, Bera JK. Hemilability-Driven Water Activation: A Ni II Catalyst for Base-Free Hydration of Nitriles to Amides. Chemistry 2017; 23:7761-7771. [PMID: 28388810 DOI: 10.1002/chem.201700816] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2017] [Indexed: 11/06/2022]
Abstract
The NiII complex 1 containing pyridyl- and hydroxy-functionalized N-heterocyclic carbenes (NHCs) is synthesized and its catalytic utility for the selective nitrile hydration to the corresponding amide under base-free conditions is evaluated. The title compound exploits a hemilabile pyridyl unit to interact with a catalytically relevant water molecule through hydrogen-bonding and promotes a nucleophilic water attack to the nitrile. A wide variety of nitriles is hydrated to the corresponding amides including the pharmaceutical drugs rufinamide, Rifater, and piracetam. Synthetically challenging α-hydroxyamides are accessed from cyanohydrins under neutral conditions. Related catalysts that lack the pyridyl unit (i.e., compounds 2 and 4) are not active whereas those containing both the pyridyl and the hydroxy or only the pyridyl pendant (i.e., compounds 1 and 3) show substantial activity. The linkage isomer 1' where the hydroxy group is bound to the metal instead of the pyridyl group was isolated under different crystallization conditions insinuating a ligand hemilabile behavior. Additional pKa measurements reveal an accessible pyridyl unit under the catalytic conditions. Kinetic studies support a ligand-promoted nucleophilic water addition to a metal-bound nitrile group. This work reports a Ni-based catalyst that exhibits functional hemilability for hydration chemistry.
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Affiliation(s)
- Kuldeep Singh
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Abir Sarbajna
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Indranil Dutta
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Pragati Pandey
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
| | - Jitendra K Bera
- Department of Chemistry and Center for Environmental Sciences and Engineering, Indian Institute of Technology Kanpur, Kanpur, 208016, India
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Shoombuatong W, Prathipati P, Owasirikul W, Worachartcheewan A, Simeon S, Anuwongcharoen N, Wikberg JES, Nantasenamat C. Towards the Revival of Interpretable QSAR Models. CHALLENGES AND ADVANCES IN COMPUTATIONAL CHEMISTRY AND PHYSICS 2017. [DOI: 10.1007/978-3-319-56850-8_1] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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15
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Pan S, Gupta AK, Subramanian V, Chattaraj PK. Quantitative Structure-Activity/Property/Toxicity Relationships through Conceptual Density Functional Theory-Based Reactivity Descriptors. PHARMACEUTICAL SCIENCES 2017. [DOI: 10.4018/978-1-5225-1762-7.ch058] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022] Open
Abstract
Developing effective structure-activity/property/toxicity relationships (QSAR/QSPR/QSTR) is very helpful in predicting biological activity, property, and toxicity of a given set of molecules. Regular change in these properties with the structural alteration is the main reason to obtain QSAR/QSPR/QSTR models. The advancement in making different QSAR/QSPR/QSTR models to describe activity, property, and toxicity of various groups of molecules is reviewed in this chapter. The successful implementation of Conceptual Density Functional Theory (CDFT)-based global as well as local reactivity descriptors in modeling effective QSAR/QSPR/QSTR is highlighted.
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Affiliation(s)
- Sudip Pan
- Indian Institute of Technology Kharagpur, India
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Larsen DB, Petersen AR, Dethlefsen JR, Teshome A, Fristrup P. Mechanistic Investigation of Molybdate-Catalysed Transfer Hydrodeoxygenation. Chemistry 2016; 22:16621-16631. [DOI: 10.1002/chem.201603028] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Indexed: 01/02/2023]
Affiliation(s)
- Daniel B. Larsen
- Department of Chemistry; Technical University of Denmark; Kemitorvet 207 2800 Kgs. Lyngby Denmark
| | - Allan R. Petersen
- Department of Chemistry; Technical University of Denmark; Kemitorvet 207 2800 Kgs. Lyngby Denmark
| | - Johannes R. Dethlefsen
- Department of Chemistry; Technical University of Denmark; Kemitorvet 207 2800 Kgs. Lyngby Denmark
| | - Ayele Teshome
- Department of Chemistry; Technical University of Denmark; Kemitorvet 207 2800 Kgs. Lyngby Denmark
| | - Peter Fristrup
- Department of Chemistry; Technical University of Denmark; Kemitorvet 207 2800 Kgs. Lyngby Denmark
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Mamy L, Patureau D, Barriuso E, Bedos C, Bessac F, Louchart X, Martin-laurent F, Miege C, Benoit P. Prediction of the Fate of Organic Compounds in the Environment From Their Molecular Properties: A Review. CRITICAL REVIEWS IN ENVIRONMENTAL SCIENCE AND TECHNOLOGY 2015; 45:1277-1377. [PMID: 25866458 PMCID: PMC4376206 DOI: 10.1080/10643389.2014.955627] [Citation(s) in RCA: 76] [Impact Index Per Article: 8.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
A comprehensive review of quantitative structure-activity relationships (QSAR) allowing the prediction of the fate of organic compounds in the environment from their molecular properties was done. The considered processes were water dissolution, dissociation, volatilization, retention on soils and sediments (mainly adsorption and desorption), degradation (biotic and abiotic), and absorption by plants. A total of 790 equations involving 686 structural molecular descriptors are reported to estimate 90 environmental parameters related to these processes. A significant number of equations was found for dissociation process (pKa), water dissolution or hydrophobic behavior (especially through the KOW parameter), adsorption to soils and biodegradation. A lack of QSAR was observed to estimate desorption or potential of transfer to water. Among the 686 molecular descriptors, five were found to be dominant in the 790 collected equations and the most generic ones: four quantum-chemical descriptors, the energy of the highest occupied molecular orbital (EHOMO) and the energy of the lowest unoccupied molecular orbital (ELUMO), polarizability (α) and dipole moment (μ), and one constitutional descriptor, the molecular weight. Keeping in mind that the combination of descriptors belonging to different categories (constitutional, topological, quantum-chemical) led to improve QSAR performances, these descriptors should be considered for the development of new QSAR, for further predictions of environmental parameters. This review also allows finding of the relevant QSAR equations to predict the fate of a wide diversity of compounds in the environment.
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Affiliation(s)
- Laure Mamy
- INRA-AgroParisTech, UMR 1402 ECOSYS (Ecologie Fonctionnelle et Ecotoxicologie des Agroécosystèmes), Versailles, France
| | - Dominique Patureau
- INRA, UR 0050 LBE (Laboratoire de Biotechnologie de l’Environnement), Narbonne, France
| | - Enrique Barriuso
- INRA-AgroParisTech, UMR 1402 ECOSYS (Ecologie Fonctionnelle et Ecotoxicologie des Aroécosystèmes), Thiverval-Grignon, France
| | - Carole Bedos
- INRA-AgroParisTech, UMR 1402 ECOSYS (Ecologie Fonctionnelle et Ecotoxicologie des Aroécosystèmes), Thiverval-Grignon, France
| | - Fabienne Bessac
- Université de Toulouse – INPT, Ecole d’Ingénieurs de Purpan – UPS, IRSAMCLaboratoire de Chimie et Physique Quantiques – CNRS, UMR 5626, Toulouse, France
| | - Xavier Louchart
- INRA, UMR 1221 LISAH (Laboratoire d’étude des Interactions Sol - Agrosystème – Hydrosystème), Montpellier, France
| | | | | | - Pierre Benoit
- INRA-AgroParisTech, UMR 1402 ECOSYS (Ecologie Fonctionnelle et Ecotoxicologie des Aroécosystèmes), Thiverval-Grignon, France
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18
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Saha B, Sengupta G, Sarbajna A, Dutta I, Bera JK. Amide synthesis from alcohols and amines catalyzed by a RuII–N-heterocyclic carbene (NHC)–carbonyl complex. J Organomet Chem 2014. [DOI: 10.1016/j.jorganchem.2013.12.051] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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19
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Quantitative structure–activity relationship (QSAR) studies as strategic approach in drug discovery. Med Chem Res 2014. [DOI: 10.1007/s00044-014-1072-3] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
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20
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Saha B, Wahidur Rahaman SM, Daw P, Sengupta G, Bera JK. Metal–Ligand Cooperation on a Diruthenium Platform: Selective Imine Formation through Acceptorless Dehydrogenative Coupling of Alcohols with Amines. Chemistry 2014; 20:6542-51. [DOI: 10.1002/chem.201304403] [Citation(s) in RCA: 89] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2013] [Indexed: 12/31/2022]
Affiliation(s)
- Biswajit Saha
- Department of Chemistry, Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016 (India), Fax: (+91) 512‐2597436
| | - S. M. Wahidur Rahaman
- Department of Chemistry, Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016 (India), Fax: (+91) 512‐2597436
| | - Prosenjit Daw
- Department of Chemistry, Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016 (India), Fax: (+91) 512‐2597436
| | - Gargi Sengupta
- Department of Chemistry, Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016 (India), Fax: (+91) 512‐2597436
| | - Jitendra K. Bera
- Department of Chemistry, Center for Environmental Science and Engineering, Indian Institute of Technology Kanpur, Kanpur 208016 (India), Fax: (+91) 512‐2597436
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21
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Brennan MR, Kim D, Fout AR. A synthetic and mechanistic investigation into the cobalt(i) catalyzed amination of aryl halides. Chem Sci 2014. [DOI: 10.1039/c4sc01257g] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The Co(i) catalyzed amination of aryl halides with lithium hexamethyldisilazide is reported.
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Affiliation(s)
- Marshall R. Brennan
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana, USA
| | - Dongyoung Kim
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana, USA
| | - Alison R. Fout
- School of Chemical Sciences
- University of Illinois at Urbana-Champaign
- Urbana, USA
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22
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Tsvetkov NP, Chen CH, Andino JG, Lord RL, Pink M, Buell RW, Caulton KG. Synthesis and Oxidative Reactivity of 2,2′-Pyridylpyrrolide Complexes of Ni(II). Inorg Chem 2013; 52:9511-21. [DOI: 10.1021/ic4011746] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
Affiliation(s)
- Nikolay P. Tsvetkov
- Department of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405-7102, United
States
| | - Chun-Hsing Chen
- Department of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405-7102, United
States
| | - José G. Andino
- Department of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405-7102, United
States
| | - Richard L. Lord
- Department of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405-7102, United
States
| | - Maren Pink
- Department of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405-7102, United
States
| | - René W. Buell
- Department of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405-7102, United
States
| | - Kenneth G. Caulton
- Department of Chemistry, Indiana University, 800 E. Kirkwood Avenue, Bloomington, Indiana 47405-7102, United
States
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Mielby J, Riisager A, Fristrup P, Kegnæs S. Mechanistic investigation of the one-pot formation of amides by oxidative coupling of alcohols with amines in methanol. Catal Today 2013. [DOI: 10.1016/j.cattod.2012.04.026] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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25
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Wu F, Mu Y, Chang H, Zhao X, Giesy JP, Wu KB. Predicting water quality criteria for protecting aquatic life from physicochemical properties of metals or metalloids. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013. [PMID: 23199259 DOI: 10.1021/es303309h] [Citation(s) in RCA: 70] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Metals are widely distributed pollutants in water and can have detrimental effects on some aquatic life and humans. Over the past few decades, the United States Environmental Protection Agency (U.S. EPA) has published a series of criteria guidelines, which contain specific criteria maximum concentrations (CMCs) for 10 metals. However, CMCs for other metals are still lacking because of financial, practical, or ethical restrictions on toxicity testing. Herein, a quantitative structure activity relationship (QSAR) method was used to develop a set of predictive relationships, based on physical and chemical characteristics of metals, and predict acute toxicities of each species for five phyla and eight families of organisms for 25 metals or metalloids. In addition, species sensitivity distributions (SSDs) were developed as independent methods for determining predictive CMCs. The quantitative ion character-activity relationships (QICAR) analysis showed that the softness index (σp), maximum complex stability constants (log -β(n)), electrochemical potential (ΔE(0)), and covalent index (X(m)(2)r) were the minimum set of structure parameters required to predict toxicity of metals to eight families of representative organisms. Predicted CMCs for 10 metals are in reasonable agreement with those recommended previously by U.S. EPA within a difference of 1.5 orders of magnitude. CMCs were significantly related to σp (r(2) = 0.76, P = 7.02 × 10(-9)) and log -β(n) (r(2) = 0.73, P = 3.88 × 10(-8)). The novel QICAR-SSD model reported here is a rapid, cost-effective, and reasonably accurate method, which can provide a beneficial supplement to existing methodologies for developing preliminarily screen level toxicities or criteria for metals, for which little or no relevant information on the toxicity to particular classes of aquatic organisms exists.
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Affiliation(s)
- Fengchang Wu
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
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26
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Manganese Compounds as Versatile Catalysts for the Oxidative Degradation of Organic Dyes. ADVANCES IN INORGANIC CHEMISTRY 2013. [DOI: 10.1016/b978-0-12-404582-8.00005-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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27
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Chakraborty A, Pan S, Chattaraj PK. Biological Activity and Toxicity: A Conceptual DFT Approach. STRUCTURE AND BONDING 2013. [DOI: 10.1007/978-3-642-32750-6_5] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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28
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Makarov IS, Fristrup P, Madsen R. Mechanistic Investigation of the Ruthenium-N-Heterocyclic-Carbene-Catalyzed Amidation of Amines with Alcohols. Chemistry 2012; 18:15683-92. [DOI: 10.1002/chem.201202400] [Citation(s) in RCA: 63] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2012] [Indexed: 01/20/2023]
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29
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Substrate and inhibitor spectra of ethylbenzene dehydrogenase: perspectives on application potential and catalytic mechanism. Appl Environ Microbiol 2012; 78:6475-82. [PMID: 22773630 DOI: 10.1128/aem.01551-12] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
Abstract
Ethylbenzene dehydrogenase (EbDH) catalyzes the initial step in anaerobic degradation of ethylbenzene in denitrifying bacteria, namely, the oxygen-independent hydroxylation of ethylbenzene to (S)-1-phenylethanol. In our study we investigate the kinetic properties of 46 substrate analogs acting as substrates or inhibitors of the enzyme. The apparent kinetic parameters of these compounds give important insights into the function of the enzyme and are consistent with the predicted catalytic mechanism based on a quantum chemical calculation model. In particular, the existence of the proposed substrate-derived radical and carbocation intermediates is substantiated by the formation of alternative dehydrogenated and hydroxylated products from some substrates, which can be regarded as mechanistic models. In addition, these results also show the surprisingly high diversity of EbDH in hydroxylating different kinds of alkylaromatic and heterocyclic compounds to the respective alcohols. This may lead to attractive industrial applications of ethylbenzene dehydrogenase for a new process of producing alcohols via hydroxylation of the corresponding aromatic hydrocarbons rather than the customary procedure of reducing the corresponding ketones.
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30
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Everson DA, Jones BA, Weix DJ. Replacing conventional carbon nucleophiles with electrophiles: nickel-catalyzed reductive alkylation of aryl bromides and chlorides. J Am Chem Soc 2012; 134:6146-59. [PMID: 22463689 PMCID: PMC3324882 DOI: 10.1021/ja301769r] [Citation(s) in RCA: 283] [Impact Index Per Article: 23.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
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A general method is presented for the synthesis of alkylated
arenes by the chemoselective combination of two electrophilic carbons.
Under the optimized conditions, a variety of aryl and vinyl bromides
are reductively coupled with alkyl bromides in high yields. Under
similar conditions, activated aryl chlorides can also be coupled with
bromoalkanes. The protocols are highly functional-group tolerant (−OH,
−NHTs, −OAc, −OTs, −OTf, −COMe,
−NHBoc, −NHCbz, −CN, −SO2Me),
and the reactions are assembled on the benchtop with no special precautions
to exclude air or moisture. The reaction displays different chemoselectivity
than conventional cross-coupling reactions, such as the Suzuki–Miyaura,
Stille, and Hiyama–Denmark reactions. Substrates bearing both
an electrophilic and nucleophilic carbon result in selective coupling
at the electrophilic carbon (R–X) and no reaction at the nucleophilic
carbon (R–[M]) for organoboron (−Bpin), organotin (−SnMe3), and organosilicon (−SiMe2OH) containing
organic halides (X–R–[M]). A Hammett study showed a
linear correlation of σ and σ(−) parameters with
the relative rate of reaction of substituted aryl bromides with bromoalkanes.
The small ρ values for these correlations (1.2–1.7) indicate
that oxidative addition of the bromoarene is not the turnover-frequency
determining step. The rate of reaction has a positive dependence on
the concentration of alkyl bromide and catalyst, no dependence upon
the amount of zinc (reducing agent), and an inverse dependence upon
aryl halide concentration. These results and studies with an organic
reductant (TDAE) argue against the intermediacy of organozinc reagents.
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Affiliation(s)
- Daniel A Everson
- Department of Chemistry, University of Rochester, Rochester, New York 14627-0216, USA
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31
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Mindich AL, Bokach NA, Dolgushin FM, Haukka M, Lisitsyn LA, Zhdanov AP, Zhizhin KY, Miltsov SA, Kuznetsov NT, Kukushkin VY. 1,3-Dipolar Cycloaddition of Nitrones to a Nitrile Functionality in closo-Decaborate Clusters: A Novel Reactivity Mode for the Borylated C≡N Group. Organometallics 2012. [DOI: 10.1021/om200993f] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Affiliation(s)
- Aleksey L. Mindich
- Department of Chemistry, Saint-Petersburg State University, Universitetsky Pr. 26, 198504 Stary
Petergof, Russian Federation
| | - Nadezhda A. Bokach
- Department of Chemistry, Saint-Petersburg State University, Universitetsky Pr. 26, 198504 Stary
Petergof, Russian Federation
| | - Fedor M. Dolgushin
- A. N. Nesmeyanov Institute of Organoelement Compounds, Russian Academy of Sciences, Vavilova str. 28, 119991 Moscow, Russian Federation
| | - Matti Haukka
- Department of Chemistry, University of Eastern Finland, P.O. Box 111, FI-80101 Joensuu, Finland
| | - Leonid A. Lisitsyn
- Department of Chemistry, Saint-Petersburg State University, Universitetsky Pr. 26, 198504 Stary
Petergof, Russian Federation
| | - Andrey P. Zhdanov
- N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 31 Leninsky Pr., 119991 Moscow, Russian Federation
| | - Konstantin Yu. Zhizhin
- N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 31 Leninsky Pr., 119991 Moscow, Russian Federation
| | - Serguei A. Miltsov
- Department of Chemistry, Saint-Petersburg State University, Universitetsky Pr. 26, 198504 Stary
Petergof, Russian Federation
| | - Nikolay T. Kuznetsov
- N. S. Kurnakov Institute of General and Inorganic Chemistry, Russian Academy of Sciences, 31 Leninsky Pr., 119991 Moscow, Russian Federation
| | - Vadim Yu. Kukushkin
- Department of Chemistry, Saint-Petersburg State University, Universitetsky Pr. 26, 198504 Stary
Petergof, Russian Federation
- Institute of Macromolecular Compounds, Russian Academy of Sciences, V.O. Bolshoi
Pr. 31, 199004 Saint-Petersburg, Russian Federation
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Gutiérrez-Moreno NJ, Medrano F, Yatsimirsky AK. Schiff base formation and recognition of amino sugars, aminoglycosides and biological polyamines by 2-formyl phenylboronic acid in aqueous solution. Org Biomol Chem 2012; 10:6960-72. [DOI: 10.1039/c2ob26290h] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/02/2023]
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33
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Yoshida T, Shimizu M, Harada M, Hitaoka S, Chuman H. Reassessment of Hammett σ as an effective parameter representing intermolecular interaction energy-links between traditional and modern QSAR approaches. Bioorg Med Chem Lett 2011; 22:124-8. [PMID: 22172696 DOI: 10.1016/j.bmcl.2011.11.047] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/15/2011] [Revised: 11/11/2011] [Accepted: 11/14/2011] [Indexed: 11/29/2022]
Abstract
The Hammett σ constant has for a long time been known to be one of most important linear free-energy related parameters that correlate with biological activity. It is a conventionally used electronic parameter in studies of enzymatic quantitative structure-activity relationships (QSAR). However, it is not necessarily obvious why σ represents variations in the free-energy change associated with the complex formation between a congeneric series of ligands with their target protein. So far, several powerful molecular calculations, such as the ab initio fragment molecular orbital (FMO) one, that are directly applicable to ligand-protein complexes have emerged. In this study, we comprehensively reevaluate experimentally derived parameter σ confirming it represents intermolecular interaction energy terms, by applying molecular orbital (MO) calculations to a simple ligand-protein complex model. The current results provide a rational and quantitative basis for bridging the gap between the traditional QSAR approach and 'the modern QSAR one', which involves the molecular calculations to evaluate the overall free-energy change for complex formation.
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Affiliation(s)
- Tatsusada Yoshida
- Institute of Health Biosciences, The University of Tokushima Graduate School, 1-78 Shomachi, Tokushima 770-8505, Japan
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Flores JA, Andino JG, Tsvetkov NP, Pink M, Wolfe RJ, Head AR, Lichtenberger DL, Massa J, Caulton KG. Assessment of the Electronic Structure of 2,2′-Pyridylpyrrolides as Ligands. Inorg Chem 2011; 50:8121-31. [DOI: 10.1021/ic2005503] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Jaime A. Flores
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - José G. Andino
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Nikolay P. Tsvetkov
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Maren Pink
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Robert J. Wolfe
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Ashley R. Head
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721, United States
| | - Dennis L. Lichtenberger
- Department of Chemistry and Biochemistry, The University of Arizona, Tucson, Arizona 85721, United States
| | - Joseph Massa
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
| | - Kenneth G. Caulton
- Department of Chemistry, Indiana University, Bloomington, Indiana 47405, United States
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35
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Yoshida T, Hirozumi K, Harada M, Hitaoka S, Chuman H. Density Functional Theory Study of Hydrogen Atom Abstraction from a Series of para-Substituted Phenols: Why is the Hammett σp+ Constant Able to Represent Radical Reaction Rates? J Org Chem 2011; 76:4564-70. [DOI: 10.1021/jo200450p] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Tatsusada Yoshida
- Institute of Health Biosciences, The University of Tokushima Graduate School, 1-78 Shomachi, Tokushima 770-8505, Japan
| | - Koji Hirozumi
- Institute of Health Biosciences, The University of Tokushima Graduate School, 1-78 Shomachi, Tokushima 770-8505, Japan
| | - Masataka Harada
- Institute of Health Biosciences, The University of Tokushima Graduate School, 1-78 Shomachi, Tokushima 770-8505, Japan
| | - Seiji Hitaoka
- Institute of Health Biosciences, The University of Tokushima Graduate School, 1-78 Shomachi, Tokushima 770-8505, Japan
| | - Hiroshi Chuman
- Institute of Health Biosciences, The University of Tokushima Graduate School, 1-78 Shomachi, Tokushima 770-8505, Japan
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36
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Kleimark J, Hedström A, Larsson PF, Johansson C, Norrby PO. Mechanistic Investigation of Iron-Catalyzed Coupling Reactions. ChemCatChem 2009. [DOI: 10.1002/cctc.200900061] [Citation(s) in RCA: 111] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
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37
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Abasq ML, Saidi M, Burgot JL, Darchen A. Substituent effects of 1,2-dithiole groups on the electrochemical oxidation of some ferrocenyl-1,2-dithiole compounds. J Organomet Chem 2009. [DOI: 10.1016/j.jorganchem.2008.10.002] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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38
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Zhang J, Melton LD, Adaim A, Skinner MA. Cytoprotective effects of polyphenolics on H2O2-induced cell death in SH-SY5Y cells in relation to their antioxidant activities. Eur Food Res Technol 2008. [DOI: 10.1007/s00217-008-0915-x] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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39
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Szaleniec M, Witko M, Heider J. Quantum chemical modelling of the C–H cleavage mechanism in oxidation of ethylbenzene and its derivates by ethylbenzene dehydrogenase. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.molcata.2008.02.016] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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40
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Deeb O, Youssef K, Hemmateenejad B. QSAR of Novel Hydroxyphenylureas as Antioxidant Agents. ACTA ACUST UNITED AC 2008. [DOI: 10.1002/qsar.200730023] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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41
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Nandi S, Vracko M, Bagchi MC. Anticancer activity of selected phenolic compounds: QSAR studies using ridge regression and neural networks. Chem Biol Drug Des 2008; 70:424-36. [PMID: 17949360 DOI: 10.1111/j.1747-0285.2007.00575.x] [Citation(s) in RCA: 43] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Phenol and its congeners are known to induce caspase-mediated apoptosis activity and cytotoxicity on various cancer cell lines. Apoptosis, scavenging of radicals, antioxidant, and pro-oxidant characteristics are primarily responsible for the antitumor activities of phenolic compounds. Quantitative structure-activity relationship studies on the cellular apoptosis and cytotoxicity of phenolic compounds have been investigated recently by Selassie and colleagues (J Med Chem; 48:7234, 2005) wherein models were developed for various carcinogenic cell lines. These quantitative structure-activity relationship models are based on few experimentally obtained physicochemical parameters such as Verloop's sterimol descriptor, hydrophobicity, Hammett electronic parameter, and octanol/water partition coefficient. The paper deals with structure-activity relationships of phenols and its derivatives for the development of predictive models from the standpoint of theoretical structural parameters and ridge regression methodology. The quantitative structure-activity relationship studies developed here for the caspase-mediated apoptosis activity and cytotoxicity on murine leukemia cell line (L1210), human promylolytic cell line (HL-60), human breast cancer cell line (MCF-7), parenteral human acute lymphoblastic cells (CCRF-CEM), and multidrug-resistant subline of CCRF-resistant to vinblastine (CEM/VLB) cells utilize physicochemical molecular descriptors calculated solely from the structure of phenolic compounds under investigation along with the descriptors used by Selassie and group. It is seen that such quantitative structure-activity relationships can provide a better quality predictive model for the phenolic compounds. The biological activities of the nine sets of phenolic compounds have been calculated based on ridge regression analysis that clearly gives a better significant correlation compared to the activities predicted by Selassie and co-workers. Counter-propagation artificial neural network studies have been introduced in the present investigation for a better understanding of multidimensional rational patterns in more complex data sets. The counter-propagation artificial neural network studies were performed on the same data set and with the same descriptors as have been carried out in developing ridge regression models and the result of counter-propagation neural network models produces very interesting findings in terms of leave-one-out test. Finally, an attempt has been made for a comparative study of the relative effectiveness of linear statistical methods versus nonlinear techniques, such as counter-propagation neural networks in modeling structure-activity studies of the phenolic compounds.
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Affiliation(s)
- Sisir Nandi
- Structural Biology and Bioinformatics Division, Indian Institute of Chemical Biology, 4 Raja S.C. Mullick Road, Jadavpur, Calcutta, India
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42
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Fristrup P, Johansen LB, Christensen CH. Mechanistic Investigation of the Gold-catalyzed Aerobic Oxidation of Alcohols. Catal Letters 2007. [DOI: 10.1007/s10562-007-9301-8] [Citation(s) in RCA: 68] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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43
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Cherkasov AR, Jonsson M, Galkin VI, Cherkasov RA. Correlation analysis in the chemistry of free radicals. RUSSIAN CHEMICAL REVIEWS 2007. [DOI: 10.1070/rc2001v070n01abeh000574] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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Szaleniec M, Hagel C, Menke M, Nowak P, Witko M, Heider J. Kinetics and mechanism of oxygen-independent hydrocarbon hydroxylation by ethylbenzene dehydrogenase. Biochemistry 2007; 46:7637-46. [PMID: 17542621 DOI: 10.1021/bi700633c] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Ethylbenzene dehydrogenase (EBDH) from the denitrifying bacterium Azoarcus sp. strain EbN1 (to be renamed Aromatoleum aromaticum) catalyzes the oxygen-independent, stereospecific hydroxylation of ethylbenzene to (S)-1-phenylethanol, the first known example of direct anaerobic oxidation of a nonactivated hydrocarbon. The enzyme is a trimeric molybdenum/iron-sulfur/heme protein of 155 kDa that is quickly inactivated in air in its reduced state. Enzyme activity can be coupled to ferricenium tetrafluoroborate, providing a convenient way for kinetic measurements. EBDH exhibits activity with a wide range of ethylbenzene analogues, which were analyzed for their kinetic parameters, stoichiometry, and formed products. The reactivity was correlated to the chemical structures by a quantitative structure-activity relationship (QSAR) model. On the basis of these results, quantum chemical calculations of DeltaG298 for formation of carbocations of the respective substrates were performed and used in reactivity analysis. A putative reaction mechanism is proposed on the basis of the experimental results and theoretical considerations. Finally, the enzyme reaction has been established in an electrochemical reactor, allowing sustained enzymatic reaction and potential technical applications of the enzyme.
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Affiliation(s)
- Maciej Szaleniec
- Institute of Catalysis and Surface Chemistry, Polish Academy of Sciences, Niezapominajek 8, 30-239 Krakow, Poland
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45
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Canonica S, Hellrung B, Müller P, Wirz J. Aqueous oxidation of phenylurea herbicides by triplet aromatic ketones. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2006; 40:6636-41. [PMID: 17144289 DOI: 10.1021/es0611238] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/12/2023]
Abstract
Excited triplet states of dissolved natural organic matter (DOM) are important players for the transformation of organic chemical contaminants in sunlit natural waters. The present study focuses on kinetics and mechanistic aspects of the transformation of phenylurea herbicides induced by well-defined excited triplet states, which have been chosen to model DOM triplet states having oxidative character. The aromatic ketones benzophenone, 3'-methoxyacetophenone, and 2-acetonaphthone were used to photogenerate their triplet states and oxidize a series of eleven substituted phenylureas. Quenching of the excited triplet states by the phenylureas was measured using laser flash photolysis in the microsecond time domain, while the oxidation kinetics of the phenylureas was followed under steady-state irradiation. Second-order rate constants for quenching and oxidation were largely identical for a given pair of ketone and phenylurea. They reached the diffusion-controlled limit (approximately 4 x 10(9) M(-1) s(-1)) and decreased with increasing free energy of electron transfer from the phenylurea to the ketone triplet. These results confirm those already obtained using phenols as the substrates to be oxidized and suggest that oxidation rates are mainly determined by the bimolecular rate constant for electron transfer, a rule that can possibly be extended to various organic contaminants. A refined estimate of the effective reduction potential of DOM excited triplet states was also obtained.
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Affiliation(s)
- Silvio Canonica
- Eawag, Swiss Federal Institute of Aquatic Science and Technology, 8600 Dübendorf Switzerland.
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Loader RJ, Singh N, O'malley PJ, Popelier PLA. The cytotoxicity of ortho alkyl substituted 4-X-phenols: A QSAR based on theoretical bond lengths and electron densities. Bioorg Med Chem Lett 2006; 16:1249-54. [PMID: 16338238 DOI: 10.1016/j.bmcl.2005.11.079] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2005] [Revised: 11/18/2005] [Accepted: 11/19/2005] [Indexed: 11/24/2022]
Abstract
A new method called quantum topological molecular similarity (QTMS) was recently proposed [O'Brien, S. E.; Popelier, P. L. A. J. Chem. Inf. Comp. Sci.2001, 41, 764] and has been shown to be successful in a variety of medicinal, ecological and physical organic QSAR/QSPRs. QTMS method uses electronic descriptors drawn from ab initio wavefunctions of geometry-optimized molecules. We investigated a remarkable and unusual set of ortho alkyl-substituted phenols [Selassie, C. D.; Verma, R. P.; Kapur, S.; Shusterman, A. J.; Hansch, C. J. Chem. Soc., Perkin2002, II, 1112], recently studied by the Hansch group. Our results do not support their proposal that a steric factor is important in the determination of the cytotoxicity of this set of substituted phenols. Thus, we conclude that the cytotoxicity of these sterically encumbered phenols is dependent primarily on electronic and radical effects, and that steric issues do not appear to be a critical distinguishing factor.
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Affiliation(s)
- R J Loader
- School of Chemistry, Sackville Site, University of Manchester, Manchester M60 1QD, UK
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Hage R, Lienke A. Anwendung von Übergangsmetallkomplexen zum Bleichen von Textilien und Holzpulpe. Angew Chem Int Ed Engl 2006. [DOI: 10.1002/ange.200500525] [Citation(s) in RCA: 59] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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Hage R, Lienke A. Applications of Transition-Metal Catalysts to Textile and Wood-Pulp Bleaching. Angew Chem Int Ed Engl 2006; 45:206-22. [PMID: 16342123 DOI: 10.1002/anie.200500525] [Citation(s) in RCA: 201] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Abstract
From an economic perspective, textile and paper bleaching are amongst the most important oxidation processes. The removal of unwanted chromophores, be it stains on cloths or residual lignin in wood pulp, consumes more than 60 % of the world production of hydrogen peroxide. However, existing technologies have their limitations. At ambient temperature, hydrogen peroxide gives little stain bleaching and is used inefficiently. Hence the high product dosages and washing temperatures required limit its application to predominantly European markets, to the exclusion of the majority of the world's population. In paper manufacture, the use of chlorine-based oxidants results in the formation of chlorinated waste products, which show poor biodegradability. On the other hand, hydrogen peroxide requires higher temperatures, longer reaction times and is more expensive. Transition-metal catalysts offer an alternative. This review discusses the main classes of known bleach catalysts and their possible modes of action.
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Affiliation(s)
- Ronald Hage
- Unilever R&D Vlaardingen, Olivier van Noortlaan 120, 3133 AT Vlaardingen, The Netherlands.
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Keinicke L, Fristrup P, Norrby PO, Madsen R. Nonradical Zinc−Barbier Reaction for Diastereoselective Synthesis of Vicinal Amino Alcohols. J Am Chem Soc 2005; 127:15756-61. [PMID: 16277518 DOI: 10.1021/ja054706a] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A new protocol for the synthesis of vicinal amino alcohols is described. The method employs a Barbier-type reaction between an imine and 3-benzoyloxyallyl bromide in the presence of zinc metal. The addition products are debenzoylated to afford amino alcohols in good yields and with diastereomeric ratios greater than 85:15 in favor of the anti isomer. A Hammett study has been performed which strongly indicates that the allylation does not follow a radical mechanism, but instead an organometallic reagent is formed which subsequently reacts with the imine. A computational study based on this mechanism reproduces the observed diastereoselectivity with high accuracy, but only when a sufficiently large portion of the substrate is included.
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Affiliation(s)
- Lise Keinicke
- Center for Sustainable and Green Chemistry, Department of Chemistry, Technical University of Denmark, Building 201, Kemitorvet, DK-2800 Lyngby, Denmark
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