1
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Bruna-Haupt EF, Perretti MD, Garro HA, Carrillo R, Machín F, Lorenzo-Castrillejo I, Gutiérrez L, Vega-Hissi EG, Mamberto M, Menacho-Marquez M, Fernández CO, García C, Pungitore CR. Synthesis of Structurally Related Coumarin Derivatives as Antiproliferative Agents. ACS OMEGA 2023; 8:26479-26496. [PMID: 37521653 PMCID: PMC10373209 DOI: 10.1021/acsomega.3c03181] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/08/2023] [Accepted: 06/29/2023] [Indexed: 08/01/2023]
Abstract
A library of structurally related coumarins was generated through synthesis reactions and chemical modification reactions to obtain derivatives with antiproliferative activity both in vivo and in vitro. Out of a total of 35 structurally related coumarin derivatives, seven of them showed inhibitory activity in in vitro tests against Taq DNA polymerase with IC50 values lower than 250 μM. The derivatives 4-(chloromethyl)-5,7-dihydroxy-2H-chromen-2-one (2d) and 4-((acetylthio)methyl)-2-oxo-2H-chromen-7-yl acetate (3c) showed the most promising anti-polymerase activity with IC50 values of 20.7 ± 2.10 and 48.25 ± 1.20 μM, respectively. Assays with tumor cell lines (HEK 293 and HCT-116) were carried out, and the derivative 4-(chloromethyl)-7,8-dihydroxy-2H-chromen-2-one (2c) was the most promising, with an IC50 value of 8.47 μM and a selectivity index of 1.87. In addition, the derivatives were evaluated against Saccharomyces cerevisiae strains that report about common modes of actions, including DNA damage, that are expected for agents that cause replicative stress. The coumarin derivatives 7-(2-(oxiran-2-yl)ethoxy)-2H-chromen-2-one (5b) and 7-(3-(oxiran-2-yl)propoxy)-2H-chromen-2-one (5c) caused DNA damage in S. cerevisiae. The O-alkenylepoxy group stands out as that with the most important functionality within this family of 35 derivatives, presenting a very good profile as an antiproliferative scaffold. Finally, the in vitro antiretroviral capacity was tested through RT-PCR assays. Derivative 5c showed inhibitory activity below 150 μM with an IC50 value of 134.22 ± 2.37 μM, highlighting the O-butylepoxy group as the functionalization responsible for the activity.
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Affiliation(s)
- Ezequiel F. Bruna-Haupt
- Department
of Chemistry, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, San Luis 5700, Argentina
- Chemical
Technology Research Institute-National Council for Scientific and
Technical Research (INTEQUI-CONICET), San Luis 5700, Argentina
| | - Marcelle D. Perretti
- Institute
of Bio-Organics Antonio González, Department of Organic Chemistry, University of La Laguna, Institute of Natural Products
and Agrobiology, IPNA-CSIC, La
Laguna 38206, Spain
| | - Hugo A. Garro
- Department
of Chemistry, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, San Luis 5700, Argentina
- Chemical
Technology Research Institute-National Council for Scientific and
Technical Research (INTEQUI-CONICET), San Luis 5700, Argentina
- Max
Planck Laboratory for Structural Biology, Chemistry and Molecular
Biophysics of Rosario (MPLbioR, UNR-MPIbpC), and Instituto de Investigaciones
para el Descubrimiento de Fármacos de Rosario (IIDEFAR, UNR-CONICET), Rosario 2002, Argentina
- National
University of Rosario, Rosario, Santa Fe 3100, Argentina
| | - Romen Carrillo
- Institute
of Bio-Organics Antonio González, Department of Organic Chemistry, University of La Laguna, Institute of Natural Products
and Agrobiology, IPNA-CSIC, La
Laguna 38206, Spain
| | - Félix Machín
- Research
Unit, Nuestra Señora de Candelaria University Hospital, Santa
Cruz de Tenerife 38010, Spain, Institute of Biomedical Technologies, University of La Laguna, Tenerife 38200, Spain
- Faculty
of Health Sciences, Fernando Pessoa Canarias
University, Las Palmas
de Gran Canaria 35450, Spain
| | - Isabel Lorenzo-Castrillejo
- Research
Unit, Nuestra Señora de Candelaria University Hospital, Santa
Cruz de Tenerife 38010, Spain, Institute of Biomedical Technologies, University of La Laguna, Tenerife 38200, Spain
| | - Lucas Gutiérrez
- Department
of Chemistry, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, San Luis 5700, Argentina
| | - Esteban G. Vega-Hissi
- Department
of Chemistry, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, San Luis 5700, Argentina
| | - Macarena Mamberto
- National
University of Rosario, Rosario, Santa Fe 3100, Argentina
- Institute
of Clinical and Experimental Immunology of Rosario (IDICER; CONICET-UNR),
Center for Research and Production of Biological Reagents (CIPReB;
FCM-UNR), Faculty of Medical Sciences, Rosario, Santa Fe 3100, Argentina
| | - Mauricio Menacho-Marquez
- National
University of Rosario, Rosario, Santa Fe 3100, Argentina
- Institute
of Clinical and Experimental Immunology of Rosario (IDICER; CONICET-UNR),
Center for Research and Production of Biological Reagents (CIPReB;
FCM-UNR), Faculty of Medical Sciences, Rosario, Santa Fe 3100, Argentina
| | - Claudio O. Fernández
- Max
Planck Laboratory for Structural Biology, Chemistry and Molecular
Biophysics of Rosario (MPLbioR, UNR-MPIbpC), and Instituto de Investigaciones
para el Descubrimiento de Fármacos de Rosario (IIDEFAR, UNR-CONICET), Rosario 2002, Argentina
- National
University of Rosario, Rosario, Santa Fe 3100, Argentina
| | - Celina García
- Institute
of Bio-Organics Antonio González, Department of Organic Chemistry, University of La Laguna, Institute of Natural Products
and Agrobiology, IPNA-CSIC, La
Laguna 38206, Spain
| | - Carlos R. Pungitore
- Department
of Chemistry, Faculty of Chemistry, Biochemistry and Pharmacy, National University of San Luis, San Luis 5700, Argentina
- Chemical
Technology Research Institute-National Council for Scientific and
Technical Research (INTEQUI-CONICET), San Luis 5700, Argentina
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2
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Singh A, Mason TG, Lu Z, Hill AJ, Pas SJ, Teo BM, Freeman BD, Izgorodina EI. Structural elucidation of polydopamine facilitated by ionic liquid solvation. Phys Chem Chem Phys 2023; 25:14700-14710. [PMID: 36806848 DOI: 10.1039/d2cp05439f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/13/2023]
Abstract
Minimal understanding of the formation mechanism and structure of polydopamine (pDA) and its natural analogue, eumelanin, impedes the practical application of these versatile polymers and limits our knowledge of the origin of melanoma. The lack of conclusive structural evidence stems from the insolubility of these materials, which has spawned significantly diverse suggestions of pDA's structure in the literature. We discovered that pDA is soluble in certain ionic liquids. Using these ionic liquids (ILs) as solvents, we present an experimental methodology to solvate pDA, enabling us to identify pDA's chemical structure. The resolved pDA structure consists of self-assembled supramolecular aggregates that contribute to the increasing complexity of the polymer. The underlying molecular energetics of pDA solvation and a macroscopic picture of the disruption of the aggregates using IL solvents have been investigated, along with studies of the aggregation mechanism in water.
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Affiliation(s)
- Abhishek Singh
- School of Chemistry, Monash University, Clayton, Melbourne, VIC 3800, Australia. .,IITB-Monash Research Academy, Bombay 400076, India
| | - Thomas G Mason
- School of Chemistry, Monash University, Clayton, Melbourne, VIC 3800, Australia.
| | - Zhenzhen Lu
- School of Chemistry, Monash University, Clayton, Melbourne, VIC 3800, Australia.
| | - Anita J Hill
- Manufacturing, CSIRO, Clayton, VIC 3168, Australia
| | - Steven J Pas
- Maritime Division, Defence Science and Technology Group, Department of Defence, 506 Lorimer St Fisherman's Bend, VIC 3207, Australia
| | - Boon Mia Teo
- School of Chemistry, Monash University, Clayton, Melbourne, VIC 3800, Australia.
| | - Benny D Freeman
- Department of Chemical Engineering, The University of Texas at Austin, Austin, TX 78712, USA
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3
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Branković J, Milovanović VM, Petrović ZD, Simijonović D, Petrović VP. Pyrazolone-type compounds (part II): in vitro and in silico evaluation of antioxidant potential; structure-activity relationship. RSC Adv 2023; 13:2884-2895. [PMID: 36756409 PMCID: PMC9846718 DOI: 10.1039/d2ra08280b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2022] [Accepted: 01/12/2023] [Indexed: 01/19/2023] Open
Abstract
The pyrazolone class comprises a variety of hybrid compounds displaying diverse biological actions. Although studied for decades, these compounds are still of interest due to their facile chemical transformations. In our previous work, we presented the synthetic route of functionalised pyrazolone derivatives. The presence of pyrazolone structural motif in many drugs, such as edaravone, prompted us to investigate the antioxidant features of the selected compounds. In this paper, we provide an extensive in vitro and in silico description of the antioxidant properties of selected pyrazolone analogues. The obtained in vitro results revealed their great antiradical potency against the DPPH radical (IC50 values in the 2.6-7.8 μM range), where the best results were obtained for analogues bearing a catechol moiety. Density functional theory (DFT) was used to assess their antioxidant capacity from the thermodynamic aspect. Here, good agreement with in vitro results was achieved. DFT was employed for the prediction of the most preferable radical scavenging pathway, also. In polar solvents, the SPLET mechanism is a favourable scavenging route, whereas in nonpolar solvents the HAT is slightly predominant. Furthermore, antioxidant mechanisms were studied in the presence of relevant reactive oxygen species. The obtained values of the reaction enthalpies with the selected radicals revealed that HAT is slightly prevailing in polar solvents, while the SPLET mechanism is dominant in nonpolar solvents. Regarding the well-known antioxidant features of the drug edaravone, these findings represent valuable data for this pyrazolone class and could be used as the basis for further investigations.
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Affiliation(s)
- Jovica Branković
- University of Kragujevac, Faculty of Science, Department of Chemistry R. Domanovića 12 34000 Kragujevac Serbia
| | - Vesna M Milovanović
- University of Kragujevac, Faculty of Agronomy, Department of Chemistry and Chemical Engineering Cara Dušana 34 32000 Čačak Serbia
| | - Zorica D Petrović
- University of Kragujevac, Faculty of Science, Department of Chemistry R. Domanovića 12 34000 Kragujevac Serbia
| | - Dušica Simijonović
- University of Kragujevac, Institute for Information Technologies, Department of Science Jovana Cvijića bb 34000 Kragujevac Serbia
| | - Vladimir P Petrović
- University of Kragujevac, Faculty of Science, Department of Chemistry R. Domanovića 12 34000 Kragujevac Serbia
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4
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Cardullo N, Monti F, Muccilli V, Amorati R, Baschieri A. Reaction with ROO• and HOO• Radicals of Honokiol-Related Neolignan Antioxidants. MOLECULES (BASEL, SWITZERLAND) 2023; 28:molecules28020735. [PMID: 36677790 PMCID: PMC9867055 DOI: 10.3390/molecules28020735] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2022] [Revised: 01/05/2023] [Accepted: 01/07/2023] [Indexed: 01/15/2023]
Abstract
Honokiol is a natural bisphenol neolignan present in the bark of Magnolia officinalis, whose extracts have been employed in oriental medicine to treat several disorders, showing a variety of biological properties, including antitumor activity, potentially related to radical scavenging. Six bisphenol neolignans with structural motifs related to the natural bioactive honokiol were synthesized. Their chain-breaking antioxidant activity was evaluated in the presence of peroxyl (ROO•) and hydroperoxyl (HOO•) radicals by both experimental and computational methods. Depending on the number and position of the hydroxyl and alkyl groups present on the molecules, these derivatives are more or less effective than the reference natural compound. The rate constant of the reaction with ROO• radicals for compound 7 is two orders of magnitude greater than that of honokiol. Moreover, for compounds displaying quinonic oxidized forms, we demonstrate that the addition of 1,4 cyclohexadiene, able to generate HOO• radicals, restores their antioxidant activity, because of the reducing capability of the HOO• radicals. The antioxidant activity of the oxidized compounds in combination with 1,4-cyclohexadiene is, in some cases, greater than that found for the starting compounds towards the peroxyl radicals. This synergy can be applied to maximize the performances of these new bisphenol neolignans.
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Affiliation(s)
- Nunzio Cardullo
- Dipartimento di Scienze Chimiche, Università di Catania, V.le A. Doria 6, 95125 Catania, Italy
| | - Filippo Monti
- Istituto per la Sintesi Organica e la Fotoreattività (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129 Bologna, Italy
| | - Vera Muccilli
- Dipartimento di Scienze Chimiche, Università di Catania, V.le A. Doria 6, 95125 Catania, Italy
| | - Riccardo Amorati
- Dipartimento di Chimica “G. Ciamician”, Università di Bologna, Via S. Giacomo 11, 40126 Bologna, Italy
- Correspondence: (R.A.); (A.B.)
| | - Andrea Baschieri
- Istituto per la Sintesi Organica e la Fotoreattività (ISOF), Consiglio Nazionale delle Ricerche (CNR), Via Gobetti 101, 40129 Bologna, Italy
- Correspondence: (R.A.); (A.B.)
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5
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Emelyanova IA, Yagunov SE, Kholshin SV, Kandalintseva NV, Prosenko OI. Synthesis and antioxidant properties of (dodecylsulfanyl)methyl derivatives of hydroquinone. Russ Chem Bull 2022. [DOI: 10.1007/s11172-022-3646-4] [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]
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6
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Branković J, Milivojević N, Milovanović V, Simijonović D, Petrović ZD, Marković Z, Šeklić DS, Živanović MN, Vukić MD, Petrović VP. Evaluation of antioxidant and cytotoxic properties of phenolic N-acylhydrazones: structure-activity relationship. ROYAL SOCIETY OPEN SCIENCE 2022; 9:211853. [PMID: 35706666 PMCID: PMC9174720 DOI: 10.1098/rsos.211853] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/26/2021] [Accepted: 05/06/2022] [Indexed: 05/03/2023]
Abstract
Cancer is still a relentless public health issue. Particularly, colorectal cancer is the third most prevalent cancer in men and the second in women. Moreover, cancer development and growth are associated with various cell disorders, such as oxidative stress and inflammation. The quest for efficient therapeutics is a challenging task, especially when it comes to achieving both cytotoxicity and selectivity. Herein, five series of phenolic N-acylhydrazones were synthesized and evaluated for their antioxidant potency, as well as their influence on HCT-116 and MRC-5 cells viability. Among 40 examined analogues, 20 of them expressed antioxidant activity against the DPPH radical. Furthermore, density functional theory was employed to estimate the antioxidant potency of the selected analogues from the thermodynamical aspect, as well as the preferable free-radical scavenging pathway. Cytotoxicity assay exposed enhanced selectivity of a number of analogues toward cancer cells. The structure-activity analysis revealed the impact of the type and position of the functional groups on both cell viability and selectivity toward cancer cells.
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Affiliation(s)
- Jovica Branković
- University of Kragujevac, Faculty of Science, Department of Chemistry, R. Domanovića 12, 34000 Kragujevac, Serbia
| | - Nevena Milivojević
- University of Kragujevac, Institute for Information Technologies, Kragujevac, Department of Science, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Vesna Milovanović
- University of Kragujevac, Faculty of Agronomy in Čačak, Ljubićska 30, Čačak, Serbia
| | - Dušica Simijonović
- University of Kragujevac, Institute for Information Technologies, Kragujevac, Department of Science, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Zorica D. Petrović
- University of Kragujevac, Faculty of Science, Department of Chemistry, R. Domanovića 12, 34000 Kragujevac, Serbia
| | - Zoran Marković
- University of Kragujevac, Institute for Information Technologies, Kragujevac, Department of Science, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Dragana S. Šeklić
- University of Kragujevac, Institute for Information Technologies, Kragujevac, Department of Science, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Marko N. Živanović
- University of Kragujevac, Institute for Information Technologies, Kragujevac, Department of Science, Jovana Cvijića bb, 34000 Kragujevac, Serbia
| | - Milena D. Vukić
- University of Kragujevac, Faculty of Science, Department of Chemistry, R. Domanovića 12, 34000 Kragujevac, Serbia
| | - Vladimir P. Petrović
- University of Kragujevac, Faculty of Science, Department of Chemistry, R. Domanovića 12, 34000 Kragujevac, Serbia
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7
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Mollica F, Lucernati R, Amorati R. Expanding the spectrum of polydopamine antioxidant activity by nitroxide conjugation. J Mater Chem B 2021; 9:9980-9988. [PMID: 34873604 DOI: 10.1039/d1tb02154k] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Polydopamine (PDA) materials are important due to their unique physicochemical properties and their potential as chemopreventive agents for diseases connected with oxidative stress. Although PDA has been suggested to display antioxidant activity, its efficacy is controversial and its mechanism of action is still unclear. Herein, we report that accurately purified PDA nanoparticles in water at pH 7.4 are unable to quench alkylperoxyls (ROO˙), which are the radicals responsible for the propagation of lipid peroxidation, despite PDA reacting with the model DPPH˙ and ABTS˙+ radicals. PDA nanoparticles prepared by copolymerization of dopamine with the dialkyl nitroxide 4-NH2TEMPO show instead good antioxidant activity, thanks to the ROO˙ trapping ability of the nitroxide. Theoretical calculations performed on a quinone-catechol dimer, reproducing the structural motive of PDA, indicate a reactivity with ROO˙ similar to catechol. These results suggest that PDA nanoparticles have an "onion-like" structure, with a catechol-rich core, which can be reached only by DPPH˙ and ABTS˙+, and a surface mainly represented by quinones. The importance of assessing the antioxidant activity by inhibited autoxidation studies is also discussed.
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Affiliation(s)
- Fabio Mollica
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy.
| | - Rosa Lucernati
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy.
| | - Riccardo Amorati
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126, Bologna, Italy.
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8
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Nanoparticle-driven self-assembling injectable hydrogels provide a multi-factorial approach for chronic wound treatment. Acta Biomater 2021; 134:131-143. [PMID: 34271166 DOI: 10.1016/j.actbio.2021.07.020] [Citation(s) in RCA: 33] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2021] [Revised: 07/06/2021] [Accepted: 07/08/2021] [Indexed: 12/20/2022]
Abstract
Chronic wounds represent a major health burden and drain on medical system. Efficient wound repair is only possible if the dressing materials target simultaneously multiple factors involved in wound chronicity, such as deleterious proteolytic and oxidative enzymes and high bacterial load. Here we develop multifunctional hydrogels for chronic wound management through self-assembling of thiolated hyaluronic acid (HA-SH) and bioactive silver-lignin nanoparticles (Ag@Lig NPs). Dynamic and reversible interactions between the polymer and Ag@Lig NPs yield hybrid nanocomposite hydrogels with shear-thinning and self-healing properties, coupled to zero-order kinetics release of antimicrobial silver in response to infection-related hyalurodinase. The hydrogels inhibit the major enzymes myeloperoxidase and matrix metalloproteinases responsible for wound chronicity in a patient's wound exudate. Furthermore, the lignin-capped AgNPs provide the hydrogel with antioxidant properties and strong antibacterial activity against Staphylococcus aureus and Pseudomonas aeruginosa. The nanocomposite hydrogels are not toxic to human keratinocytes after 7 days of direct contact. Complete tissue remodeling and restoration of skin integrity is demonstrated in vivo in a diabetic mouse model. Hematological analysis reveals lack of wound inflammation due to bacterial infection or toxicity, confirming the potential of HA-SH/Ag@Lig NPs hydrogels for chronic wound management. STATEMENT OF SIGNIFICANCE: Multifunctional hydrogels are promising materials to promote healing of complex wounds. Herein, we report simple and versatile route to prepare biocompatible and multifunctional self-assembled hydrogels for efficient chronic wound treatment utilizing polymer-nanoparticle interactions. Hybrid silver-lignin nanoparticles (Ag@Lig NPs) played both: i) structural role, acting as crosslinking nodes in the hydrogel and endowing it with shear-thinning (ability to flow under applied shear stress) and self-healing properties, and ii) functional role, imparting strong antibacterial and antioxidant activity. Remarkably, the in situ self-assembling of thiolated hyaluronic acid and Ag@Lig NPs yields nanocomposite hydrogels able to simultaneously inhibits the major factors involved in wound chronicity, namely the overexpressed deleterious proteolytic and oxidative enzymes, and high bacterial load.
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9
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Guo Y, Baschieri A, Mollica F, Valgimigli L, Cedrowski J, Litwinienko G, Amorati R. Hydrogen Atom Transfer from HOO . to ortho-Quinones Explains the Antioxidant Activity of Polydopamine. Angew Chem Int Ed Engl 2021; 60:15220-15224. [PMID: 33876878 PMCID: PMC8362028 DOI: 10.1002/anie.202101033] [Citation(s) in RCA: 34] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2021] [Revised: 04/09/2021] [Indexed: 12/24/2022]
Abstract
Melanins are stable and non-toxic biomaterials with a great potential as chemopreventive agents for diseases connected with oxidative stress, but the mechanism of their antioxidant action is unclear. Herein, we show that polydopamine (PDA), a well-known synthetic melanin, becomes an excellent trap for alkylperoxyl radicals (ROO. , typically formed during autoxidation of lipid substrates) in the presence of hydroperoxyl radicals (HOO. ). The key reaction explaining this peculiar antioxidant activity is the reduction of the ortho-quinone moieties present in PDA by the reaction with HOO. . This reaction occurs via a H-atom transfer mechanism, as demonstrated by the large kinetic solvent effect of the reaction of a model quinone (3,5-di-tert-butyl-1,2-benzoquinone) with HOO. (k=1.5×107 and 1.1×105 M-1 s-1 in PhCl and MeCN). The chemistry disclosed herein is an important step to rationalize the redox-mediated bioactivity of melanins and of quinones.
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Affiliation(s)
- Yafang Guo
- Department of Chemistry “G. Ciamician”University of BolognaVia S. Giacomo 1140126BolognaItaly
| | - Andrea Baschieri
- Department of Chemistry “G. Ciamician”University of BolognaVia S. Giacomo 1140126BolognaItaly
| | - Fabio Mollica
- Department of Chemistry “G. Ciamician”University of BolognaVia S. Giacomo 1140126BolognaItaly
| | - Luca Valgimigli
- Department of Chemistry “G. Ciamician”University of BolognaVia S. Giacomo 1140126BolognaItaly
| | - Jakub Cedrowski
- Faculty of ChemistryUniversity of WarsawPasteura 102-093WarsawPoland
| | | | - Riccardo Amorati
- Department of Chemistry “G. Ciamician”University of BolognaVia S. Giacomo 1140126BolognaItaly
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10
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Guo Y, Baschieri A, Mollica F, Valgimigli L, Cedrowski J, Litwinienko G, Amorati R. Hydrogen Atom Transfer from HOO
.
to
ortho
‐Quinones Explains the Antioxidant Activity of Polydopamine. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202101033] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2023]
Affiliation(s)
- Yafang Guo
- Department of Chemistry “G. Ciamician” University of Bologna Via S. Giacomo 11 40126 Bologna Italy
| | - Andrea Baschieri
- Department of Chemistry “G. Ciamician” University of Bologna Via S. Giacomo 11 40126 Bologna Italy
| | - Fabio Mollica
- Department of Chemistry “G. Ciamician” University of Bologna Via S. Giacomo 11 40126 Bologna Italy
| | - Luca Valgimigli
- Department of Chemistry “G. Ciamician” University of Bologna Via S. Giacomo 11 40126 Bologna Italy
| | - Jakub Cedrowski
- Faculty of Chemistry University of Warsaw Pasteura 1 02-093 Warsaw Poland
| | | | - Riccardo Amorati
- Department of Chemistry “G. Ciamician” University of Bologna Via S. Giacomo 11 40126 Bologna Italy
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11
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I-Ting T, Montero-Campillo MM, Alkorta I, Elguero J, Yáñez M. Large Stabilization Effects by Intramolecular Beryllium Bonds in Ortho-Benzene Derivatives. Molecules 2021; 26:molecules26113401. [PMID: 34199746 PMCID: PMC8199991 DOI: 10.3390/molecules26113401] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/13/2021] [Revised: 05/31/2021] [Accepted: 06/01/2021] [Indexed: 11/16/2022] Open
Abstract
Intramolecular interactions are shown to be key for favoring a given structure in systems with a variety of conformers. In ortho-substituted benzene derivatives including a beryllium moiety, beryllium bonds provide very large stabilizations with respect to non-bound conformers and enthalpy differences above one hundred kJ·mol−1 are found in the most favorable cases, especially if the newly formed rings are five or six-membered heterocycles. These values are in general significantly larger than hydrogen bonds in 1,2-dihidroxybenzene. Conformers stabilized by a beryllium bond exhibit the typical features of this non-covalent interaction, such as the presence of a bond critical point according to the topology of the electron density, positive Laplacian values, significant geometrical distortions and strong interaction energies between the donor and acceptor quantified by using the Natural Bond Orbital approach. An isodesmic reaction scheme is used as a tool to measure the strength of the beryllium bond in these systems in terms of isodesmic energies (analogous to binding energies), interaction energies and deformation energies. This approach shows that a huge amount of energy is spent on deforming the donor–acceptor pairs to form the new rings.
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Affiliation(s)
- Tsai I-Ting
- Departamento de Química, Módulo 13, Facultad de Ciencias, and Institute of Advanced Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049 Madrid, Spain;
| | - M. Merced Montero-Campillo
- Departamento de Química, Módulo 13, Facultad de Ciencias, and Institute of Advanced Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049 Madrid, Spain;
- Correspondence: (M.M.M.-C.); (I.A.); (M.Y.)
| | - Ibon Alkorta
- Instituto de Química Médica, IQM-CSIC, Juan de la Cierva, 3, 28006 Madrid, Spain;
- Correspondence: (M.M.M.-C.); (I.A.); (M.Y.)
| | - José Elguero
- Instituto de Química Médica, IQM-CSIC, Juan de la Cierva, 3, 28006 Madrid, Spain;
| | - Manuel Yáñez
- Departamento de Química, Módulo 13, Facultad de Ciencias, and Institute of Advanced Chemical Sciences (IAdChem), Universidad Autónoma de Madrid, Campus de Excelencia UAM-CSIC, Cantoblanco, 28049 Madrid, Spain;
- Correspondence: (M.M.M.-C.); (I.A.); (M.Y.)
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12
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Molecular Tailoring Approach for the Estimation of Intramolecular Hydrogen Bond Energy. Molecules 2021; 26:molecules26102928. [PMID: 34069140 PMCID: PMC8155843 DOI: 10.3390/molecules26102928] [Citation(s) in RCA: 30] [Impact Index Per Article: 10.0] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2021] [Revised: 05/11/2021] [Accepted: 05/12/2021] [Indexed: 11/29/2022] Open
Abstract
Hydrogen bonds (HBs) play a crucial role in many physicochemical and biological processes. Theoretical methods can reliably estimate the intermolecular HB energies. However, the methods for the quantification of intramolecular HB (IHB) energy available in the literature are mostly empirical or indirect and limited only to evaluating the energy of a single HB. During the past decade, the authors have developed a direct procedure for the IHB energy estimation based on the molecular tailoring approach (MTA), a fragmentation method. This MTA-based method can yield a reliable estimate of individual IHB energy in a system containing multiple H-bonds. After explaining and illustrating the methodology of MTA, we present its use for the IHB energy estimation in molecules and clusters. We also discuss the use of this method by other researchers as a standard, state-of-the-art method for estimating IHB energy as well as those of other noncovalent interactions.
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13
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Mammadova F, Hamarat B, Ahmadli D, Şahin O, Bozkaya U, Türkmen YE. Polarization‐Enhanced Hydrogen Bonding in 1,8‐Dihydroxynaphthalene: Conformational Analysis, Binding Studies and Hydrogen Bonding Catalysis. ChemistrySelect 2020. [DOI: 10.1002/slct.202002960] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Flora Mammadova
- Department of Chemistry, Faculty of Science Bilkent University Ankara 06800 Turkey
| | - Büşra Hamarat
- Department of Chemistry Hacettepe University Ankara 06800 Turkey
| | - Dilgam Ahmadli
- Department of Chemistry, Faculty of Science Bilkent University Ankara 06800 Turkey
| | - Onur Şahin
- Scientific and Technological Research Application and Research Center Sinop University Sinop 57000 Turkey
| | - Uğur Bozkaya
- Department of Chemistry Hacettepe University Ankara 06800 Turkey
| | - Yunus E. Türkmen
- Department of Chemistry, Faculty of Science Bilkent University Ankara 06800 Turkey
- UNAM-National Nanotechnology Research Center, Institute of Materials Science and Nanotechnology Bilkent University Ankara 06800 Turkey
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14
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Jennings JJ, Milic M, Targos K, Franz AK. NMR quantification of H-bond donating ability for bioactive functional groups and isosteres. Eur J Med Chem 2020; 207:112693. [PMID: 32862126 DOI: 10.1016/j.ejmech.2020.112693] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Revised: 07/15/2020] [Accepted: 07/24/2020] [Indexed: 12/20/2022]
Abstract
The H-bond donating ability for 127 compounds including drug fragments and isosteres have been quantified using a simple and rapid method with 31P NMR spectroscopy. Functional groups important to medicinal chemistry were evaluated including carboxylic acids, alcohols, phenols, thioic acids and nitrogen group H-bond donors. 31P NMR shifts for binding to a phosphine oxide probe have a higher correlation with equilibrium constants for H-bonding (log KHA) than acidity (pKa), indicating that these binding experiments are representative of H-bonding ability and not proton transfer. Additionally, 31P NMR binding data for carboxylic acid isosteres correlates with physicochemical properties such as lipophilicity, membrane permeability and plasma protein binding. This method has been used to evaluate the H-bond donating ability of small molecule drug compounds such as NSAIDs and antimicrobials.
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Affiliation(s)
- Julia J Jennings
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA, 95616, United States
| | - Mira Milic
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA, 95616, United States
| | - Karina Targos
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA, 95616, United States
| | - Annaliese K Franz
- Department of Chemistry, University of California, One Shields Avenue, Davis, CA, 95616, United States.
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15
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Gebru H, Tianfo G, Li Z. Guanidine masked catechol initiator promoted ring-opening polymerization of sarcosineN-carboxyanhydride. INTERNATIONAL JOURNAL OF POLYMER ANALYSIS AND CHARACTERIZATION 2020. [DOI: 10.1080/1023666x.2020.1783080] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Hailemariam Gebru
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
- Technology and Innovation Institute of Ethiopia, Addis Ababa, Ethiopia
| | - Guo Tianfo
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
| | - Zhenjiang Li
- State Key Laboratory of Materials-Oriented Chemical Engineering, College of Biotechnology and Pharmaceutical Engineering, Nanjing Tech University, Nanjing, China
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16
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Singh V, Ibnusaud I, Gadre SR, Deshmukh MM. Fragmentation method reveals a wide spectrum of intramolecular hydrogen bond energies in antioxidant natural products. NEW J CHEM 2020. [DOI: 10.1039/d0nj00304b] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
Very strong and weak IHBs in curcumin.
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Affiliation(s)
- Vijay Singh
- Department of Chemistry
- Dr. Harisingh Gour Vishwavidyalaya (A Central University)
- Sagar
- India
| | - Ibrahim Ibnusaud
- Institute for Intensive Research in Basic Sciences
- Mahatma Gandhi University Campus
- P.O. Kottayam
- India
| | - Shridhar R. Gadre
- Interdisciplinary School of Scientific Computing and Department of Chemistry
- Savitribai Phule Pune University
- Pune 411 007
- India
| | - Milind M. Deshmukh
- Department of Chemistry
- Dr. Harisingh Gour Vishwavidyalaya (A Central University)
- Sagar
- India
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17
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Weirich L, Magalhães de Oliveira J, Merten C. How many solvent molecules are required to solvate chiral 1,2-diols with hydrogen bonding solvents? A VCD spectroscopic study. Phys Chem Chem Phys 2020; 22:1525-1533. [DOI: 10.1039/c9cp06030h] [Citation(s) in RCA: 18] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A VCD spectroscopic analysis of selected model systems for solute–solvent interactions of chiral diols with hydrogen bonding solvents DMSO and ACN.
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Affiliation(s)
- Luisa Weirich
- Ruhr-Universität Bochum
- Fakultät für Chemie und Biochemie
- Organische Chemie II
- 44801 Bochum
- Germany
| | | | - Christian Merten
- Ruhr-Universität Bochum
- Fakultät für Chemie und Biochemie
- Organische Chemie II
- 44801 Bochum
- Germany
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18
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Grieco C, Empey JM, Kohl FR, Kohler B. Probing eumelanin photoprotection using a catechol:quinone heterodimer model system. Faraday Discuss 2019; 216:520-537. [PMID: 31012874 DOI: 10.1039/c8fd00231b] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Eumelanin is a natural pigment with photoprotective and radical scavenging characteristics, which are vital for a multitude of living organisms. However, the molecular mechanisms behind these functions remain obscure, in part because eumelanin is a heterogeneous polymer composed of a complex assortment of structural and chemical domains. Despite uncertainty about its precise structure, the functional units of eumelanin are thought to include quinones in various oxidation states. Here, we investigate the photochemistry of a catechol : o-quinone heterodimer as a model system for uncovering the photoprotective roots of eumelanin. Ultrafast transient absorption measurements in the UV to near-IR spectral regions are used to identify the photochemical processes that follow selective excitation of the o-quinone in the heterodimer using 395 nm light. We find that both singlet and triplet o-quinone excited states induce hydrogen atom transfer from the catechol, forming semiquinone radical pairs that persist beyond 2.5 ns, which is the upper time limit accessible by our instrument. Furthermore, the hydrogen atom transfer reaction was found to occur 1000 times faster via the singlet channel. Excited state pathways such as these may be important in eumelanin, where similar hydrogen-bonded interfaces are believed to exist between catechol and o-quinone functional groups.
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Affiliation(s)
- Christopher Grieco
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, USA.
| | - Jennifer M Empey
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, USA.
| | - Forrest R Kohl
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, USA.
| | - Bern Kohler
- Department of Chemistry and Biochemistry, The Ohio State University, 100 West 18th Avenue, Columbus, Ohio 43210, USA.
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19
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Viglianisi C, Menichetti S. Chain Breaking Antioxidant Activity of Heavy (S, Se, Te) Chalcogens Substituted Polyphenols. Antioxidants (Basel) 2019; 8:antiox8100487. [PMID: 31623080 PMCID: PMC6826409 DOI: 10.3390/antiox8100487] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/30/2019] [Revised: 10/12/2019] [Accepted: 10/15/2019] [Indexed: 12/13/2022] Open
Abstract
Polyphenols are probably the most important family of natural and synthetic chain-breaking antioxidants. Since long ago, chemists have studied how structural (bioinspired) modifications can improve the antioxidant activity of these compounds in terms of reaction rate with radical reactive oxygen species (ROS), catalytic character, multi-defence action, hydrophilicity/lipophilicity, biodistribution etc. In this framework, we will discuss the effect played on the overall antioxidant profile by the insertion of heavy chalcogens (S, Se and Te) in the phenolic skeleton.
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Affiliation(s)
- Caterina Viglianisi
- Department of Chemistry "Ugo Schiff", University of Florence, Via Della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
| | - Stefano Menichetti
- Department of Chemistry "Ugo Schiff", University of Florence, Via Della Lastruccia 3-13, 50019 Sesto Fiorentino, Italy.
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20
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Ali HM, Ali IH. Structure-antioxidant activity relationships, QSAR, DFT calculation, and mechanisms of flavones and flavonols. Med Chem Res 2019. [DOI: 10.1007/s00044-019-02452-z] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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21
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Cha S, Marekha B, Wagner M, Hunger J. Hydrogen-Bond Structure and Dynamics of TADDOL Asymmetric Organocatalysts Correlate with Catalytic Activity. Chemistry 2019; 25:9984-9990. [PMID: 31090245 DOI: 10.1002/chem.201901594] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/05/2019] [Indexed: 11/07/2022]
Abstract
The catalytic efficiency of diol-based organocatalysts has been shown to strongly depend on the diols molecular structure including hydrogen-bonding, yet, the underlying molecular-level origins have remained elusive. Herein a study on the inter- and intramolecular hydrogen-bonding of two isomeric diol-based catalysts (TADDOLs) in solution is presented: 1-Naphthyl substituted TADDOL (1nTADDOL), which exhibits high catalytic efficiency, and 2-naphthyl substituted TADDOL (2nTADDOL), which is a poor catalyst. Using nuclear magnetic resonance and infrared spectroscopy, comparable hydrogen-bond strengths for both TADDOLs in solution were found, however, significantly slower bonding dynamics for 1nTADDOL. In aromatic solvents, 1nTADDOL forms less, but longer-lived, intermolecular OH⋅⋅⋅π bonds to solvent molecules, as compared to 2nTADDOL. Thus, rather than previously suggested differences in intermolecular hydrogen-bonding strengths, the results suggest that the hydrogen-bonding kinetics and entropies differ for both TADDOLs, which also explains their vastly different catalytic activities.
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Affiliation(s)
- Seoncheol Cha
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Bogdan Marekha
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Manfred Wagner
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
| | - Johannes Hunger
- Max Planck Institute for Polymer Research, Ackermannweg 10, 55128, Mainz, Germany
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22
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Grieco C, Hanes AT, Blancafort L, Kohler B. Effects of Intra- and Intermolecular Hydrogen Bonding on O-H Bond Photodissociation Pathways of a Catechol Derivative. J Phys Chem A 2019; 123:5356-5366. [PMID: 31242734 DOI: 10.1021/acs.jpca.9b04573] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The catechol functional motif is thought to play both a structural and photochemical role in the ubiquitous natural pigment, eumelanin. Intramolecular and intermolecular hydrogen bonding interactions lead to a variety of geometries involving the two O-H groups in catechol, but its photophysical behavior in these situations has not been comprehensively characterized. Toward this end, we monitor the UV-induced O-H bond photodissociation reaction in an exemplar catechol derivative, 4- tert-butylcatechol, possessing different intramolecular and intermolecular hydrogen bonding geometries using femtosecond transient absorption spectroscopy measurements in the UV-visible and mid-infrared regions following 265 nm photoexcitation. Three different hydrogen bonding arrangements are obtained by tuning solution complexation equilibria of the catechol with the hydrogen bond acceptor, diethyl ether (Et2O), and are verified computationally. We find that intermolecular hydrogen bonding to the free O-H group in catechol increases its first excited singlet state (S1) lifetime by 2 orders of magnitude (i.e., ∼ 16 to 1410 ps), and that O-H bond dissociation is prevented because Et2O is a poor hydrogen atom acceptor. Complexation of both O-H groups with multiple Et2O molecules further elongates the S1 lifetime to 1670 ps due to shifting of the solution equilibria that describe complex formation. Weakening of the characteristic, intramolecular hydrogen bond of the catechol derivative by intermolecular hydrogen bonding to one or more Et2O molecules does not enhance the rate of O-H bond dissociation.
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Affiliation(s)
- Christopher Grieco
- Department of Chemistry and Biochemistry , The Ohio State University , 100 West 18th Avenue , Columbus , Ohio 43210 , United States
| | - Alex T Hanes
- Department of Chemistry and Biochemistry , The Ohio State University , 100 West 18th Avenue , Columbus , Ohio 43210 , United States
| | - Lluís Blancafort
- Institut de Química Computacional i Catàlisi and Departament de Química, Facultat de Ciències , Universitat de Girona , C/M.A. Capmany 69 , 17003 Girona , Spain
| | - Bern Kohler
- Department of Chemistry and Biochemistry , The Ohio State University , 100 West 18th Avenue , Columbus , Ohio 43210 , United States
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23
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Łukasik N, Wagner-Wysiecka E, Małachowska A. Iron(iii)-selective materials based on a catechol-bearing amide for optical sensing. Analyst 2019; 144:3119-3127. [PMID: 30924820 DOI: 10.1039/c9an00188c] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis and ion-binding properties of a new amide L derived from 3,4-dihydroxybenzoic acid are described. Due to the presence of a catechol unit, the compound interacts selectively with iron(iii) in organic solvent (dimethyl sulfoxide, DMSO) to produce a color change from pale yellow to green. The incorporation of the ligand L into polymeric matrices or its encapsulation into surfactant-based spheres enables analyte detection in aqueous solutions. The influence of the ligand environment (i.e. organic solvent, polymeric membrane or micelle) on the properties of the sensing materials is analyzed and the sensors are compared.
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Affiliation(s)
- Natalia Łukasik
- Department of Chemistry and Technology of Functional Materials, Gdansk University of Technology, 11/12 Narutowicza Street, 80-233 Gdansk, Poland.
| | - Ewa Wagner-Wysiecka
- Department of Chemistry and Technology of Functional Materials, Gdansk University of Technology, 11/12 Narutowicza Street, 80-233 Gdansk, Poland.
| | - Aleksandra Małachowska
- Department of Process Engineering and Chemical Technology, Faculty of Chemistry, Gdansk University of Technology, 11/12 Narutowicza Street, 80-233 Gdansk, Poland
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24
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Grieco C, Kohl FR, Zhang Y, Natarajan S, Blancafort L, Kohler B. Intermolecular Hydrogen Bonding Modulates O-H Photodissociation in Molecular Aggregates of a Catechol Derivative. Photochem Photobiol 2018; 95:163-175. [PMID: 30317633 DOI: 10.1111/php.13035] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2018] [Accepted: 10/01/2018] [Indexed: 01/15/2023]
Abstract
The catechol functional group plays a major role in the chemistry of a wide variety of molecules important in biology and technology. In eumelanin, intermolecular hydrogen bonding between these functional groups is thought to contribute to UV photoprotective and radical buffering properties, but the mechanisms are poorly understood. Here, aggregates of 4-t-butylcatechol are used as model systems to study how intermolecular hydrogen bonding influences photochemical pathways that may occur in eumelanin. Ultrafast UV-visible and mid-IR transient absorption measurements are used to identify the photochemical processes of 4-t-butylcatechol monomers and their hydrogen-bonded aggregates in cyclohexane solution. Monomer photoexcitation results in hydrogen atom ejection to the solvent via homolytic O-H bond dissociation with a time constant of 12 ps, producing a neutral semiquinone radical with a lifetime greater than 1 ns. In contrast, intermolecular hydrogen bonding interactions within aggregates retard O-H bond photodissociation by over an order of magnitude in time. Excited state structural relaxation is proposed to slow O-H dissociation, allowing internal conversion to the ground state to occur in hundreds of picoseconds in competition with this channel. The semiquinone radicals formed in the aggregates exhibit spectral broadening of both their electronic and vibrational transitions.
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Affiliation(s)
- Christopher Grieco
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH
| | - Forrest R Kohl
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH
| | - Yuyuan Zhang
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH
| | - Sangeetha Natarajan
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH
| | - Lluís Blancafort
- Institut de Química Computacional i Catàlisi and Departament de Química, Facultat de Ciències, Universitat de Girona, Girona, Spain
| | - Bern Kohler
- Department of Chemistry and Biochemistry, The Ohio State University, Columbus, OH
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25
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Foti MC, Amorati R, Baschieri A, Rocco C. Singlet oxygen quenching- and chain-breaking antioxidant-properties of a quercetin dimer able to prevent age-related macular degeneration. Biophys Chem 2018; 243:17-23. [PMID: 30352336 DOI: 10.1016/j.bpc.2018.10.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/26/2018] [Revised: 09/18/2018] [Accepted: 10/03/2018] [Indexed: 01/07/2023]
Abstract
A dimer of quercetin prepared through a Mannich reaction protects pyridinium bisretinoid A2E from photooxidation at 430 nm in aqueous medium at pH 7.4. In the presence of light and O2, A2E is quickly attacked by 1O2 produced in situ (by excited A2E) to give nonaoxirane and other oxygenated compounds which can be involved in diseases of the macula. Peroxyl radicals might have only a marginal role on the photooxidation of A2E. The dimer is actually a potent quencher of 1O2 with a rate constant kQ of 8.5 × 108 M-1 s-1 in methanol at room temperature. On the other hand, its antioxidant abilities against ROO· radicals are quite limited since kROO· = 7.3 × 105 M-1 s-1 (in buffer solution at pH 7.4), the value being essentially identical to that of quercetin. The quenching of 1O2 by the dimer is therefore the main reason for the A2E protection and prevention of age-related macular degeneration.
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Affiliation(s)
- Mario C Foti
- Istituto di Chimica Biomolecolare del CNR, via P. Gaifami 18, I-95126 Catania, Italy.
| | - Riccardo Amorati
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126 Bologna, Italy
| | - Andrea Baschieri
- Department of Chemistry "G. Ciamician", University of Bologna, Via S. Giacomo 11, 40126 Bologna, Italy
| | - Concetta Rocco
- Istituto di Chimica Biomolecolare del CNR, via P. Gaifami 18, I-95126 Catania, Italy
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26
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Simijonović D, Petrović ZD, Milovanović VM, Petrović VP, Bogdanović GA. A new efficient domino approach for the synthesis of pyrazolyl-phthalazine-diones. Antiradical activity of novel phenolic products. RSC Adv 2018; 8:16663-16673. [PMID: 35540516 PMCID: PMC9080326 DOI: 10.1039/c8ra02702a] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2018] [Accepted: 04/27/2018] [Indexed: 11/21/2022] Open
Abstract
Pyrazolyl-phthalazine-dione derivatives (PPDs) were synthetized in the ionic liquid catalyzed one-pot multicomponent reaction of acetylacetone, 2,3-dihydrophthalazine-1,4-dione, and different aldehydes in moderate to good yields. Six new PPDs were obtained, and the crystal structure of 2-acetyl-1-(4-fluorophenyl)-3-methyl-1H-pyrazolo[1,2-b]phthalazine-5,10-dione (PPD-4) was determined. The most interesting structural features of the novel PPD-4 is the formation of a rather short intermolecular distance between the F atom of one molecule and the midpoint of the neighbouring six-membered heterocyclic ring. This interaction arranges all molecules into parallel supramolecular chains. UV-Vis spectra of all PPDs were acquired and compared to the simulated ones obtained with TD-DFT. All synthetized compounds were subjected to evaluation of their in vitro antioxidative activity using a stable DPPH radical. It was shown that PPD-7, with a catechol motive, is the most active antioxidant, while PPD-9, with two neighbouring methoxy groups to the phenolic OH, exerted a somewhat lower, but significant antioxidative potential. The results of DFT thermodynamical study are in agreement with experimental findings that PPD-7 and PPD-9 should be considered as powerful radical scavengers. In addition, the obtained theoretical results (bond dissociation and proton abstraction energies) specify SPLET as a prevailing radical scavenging mechanism in polar solvents, and HAT in solvents with lower polarity. On the other hand, the obtained reaction enthalpies for inactivation of free radicals suggest competition between HAT and SPLET mechanisms, except in the case of the ˙OH radical in polar solvents, where HAT is labeled as prefered. An efficient one-pot method for the synthesis of pyrazolyl-phthalazine-diones was developed. New phenolic compounds exerted good to excellent antioxidative activity.![]()
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Affiliation(s)
- Dušica Simijonović
- University of Kragujevac
- Faculty of Science
- Department of Chemistry
- 34000 Kragujevac
- Serbia
| | - Zorica D. Petrović
- University of Kragujevac
- Faculty of Science
- Department of Chemistry
- 34000 Kragujevac
- Serbia
| | - Vesna M. Milovanović
- University of Kragujevac
- Faculty of Science
- Department of Chemistry
- 34000 Kragujevac
- Serbia
| | - Vladimir P. Petrović
- University of Kragujevac
- Faculty of Science
- Department of Chemistry
- 34000 Kragujevac
- Serbia
| | - Goran A. Bogdanović
- Vinča Institute of Nuclear Sciences
- University of Belgrade
- 11001 Belgrade
- Serbia
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27
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Energetic and electronic computation of the two-hydrogen atom donation process in catecholic and non-catecholic anthocyanidins. Food Chem 2017; 243:145-150. [PMID: 29146321 DOI: 10.1016/j.foodchem.2017.09.120] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2017] [Revised: 09/02/2017] [Accepted: 09/25/2017] [Indexed: 11/23/2022]
Abstract
Antioxidant activity of anthocyanidins is greatly affected by the 3-hydroxyl group and/or a catecholic moiety. The two-hydrogen atom donation process is frequently used to explain the high antioxidant activity of polyphenolic compounds leading to the formation of stable diketones e.g. 1,2-quinones. Thermodynamic parameters, HOMO and spin density were computed to identify the favoured path, either through the 3-hydroxyl group or through the catecholic moiety in a series of catecholic and non-catecholic 3-oxy- (and deoxy)-anthocyanidins. DFT calculations showed that the donation process in non-catecholic anthocyanidins depended on the substituents on ring B. Anthocyanidins with 3',5'-diOMe groups showed donation through 3,4'-OH or, otherwise, through 3,5-OH groups. Catecholic 3-oxyanthocyanidins, on the other hand, showed donation through the 3,4'-OH path rather than the catecholic path (4',3'-path). The 3,4'-path was favoured by the formation of planar 3-radicals in the first step and the stabilization of 4'-radicals in the second step by H-bonding with the 3'-OH group.
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28
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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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Protective effects of 4-methylcoumarins and related compounds as radical scavengers and chain-breaking antioxidants. Biochimie 2017; 140:133-145. [DOI: 10.1016/j.biochi.2017.07.010] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/03/2017] [Accepted: 07/21/2017] [Indexed: 01/24/2023]
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Dominelli‐Whiteley N, Brown JJ, Muchowska KB, Mati IK, Adam C, Hubbard TA, Elmi A, Brown AJ, Bell IAW, Cockroft SL. Strong Short-Range Cooperativity in Hydrogen-Bond Chains. Angew Chem Int Ed Engl 2017; 56:7658-7662. [PMID: 28493462 PMCID: PMC5488241 DOI: 10.1002/anie.201703757] [Citation(s) in RCA: 38] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2017] [Revised: 05/09/2017] [Indexed: 01/23/2023]
Abstract
Chains of hydrogen bonds such as those found in water and proteins are often presumed to be more stable than the sum of the individual H bonds. However, the energetics of cooperativity are complicated by solvent effects and the dynamics of intermolecular interactions, meaning that information on cooperativity typically is derived from theory or indirect structural data. Herein, we present direct measurements of energetic cooperativity in an experimental system in which the geometry and the number of H bonds in a chain were systematically controlled. Strikingly, we found that adding a second H-bond donor to form a chain can almost double the strength of the terminal H bond, while further extensions have little effect. The experimental observations add weight to computations which have suggested that strong, but short-range cooperative effects may occur in H-bond chains.
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Affiliation(s)
- Nicholas Dominelli‐Whiteley
- EaStCHEM School of ChemistryUniversity of Edinburgh, Joseph Black BuildingDavid Brewster RoadEdinburghEH9 3FJUK
| | - James J. Brown
- EaStCHEM School of ChemistryUniversity of Edinburgh, Joseph Black BuildingDavid Brewster RoadEdinburghEH9 3FJUK
| | - Kamila B. Muchowska
- EaStCHEM School of ChemistryUniversity of Edinburgh, Joseph Black BuildingDavid Brewster RoadEdinburghEH9 3FJUK
| | - Ioulia K. Mati
- EaStCHEM School of ChemistryUniversity of Edinburgh, Joseph Black BuildingDavid Brewster RoadEdinburghEH9 3FJUK
| | - Catherine Adam
- EaStCHEM School of ChemistryUniversity of Edinburgh, Joseph Black BuildingDavid Brewster RoadEdinburghEH9 3FJUK
| | - Thomas A. Hubbard
- EaStCHEM School of ChemistryUniversity of Edinburgh, Joseph Black BuildingDavid Brewster RoadEdinburghEH9 3FJUK
| | - Alex Elmi
- EaStCHEM School of ChemistryUniversity of Edinburgh, Joseph Black BuildingDavid Brewster RoadEdinburghEH9 3FJUK
| | | | - Ian A. W. Bell
- Afton Chemical LimitedLondon RoadBracknellBerkshireRG12 2UWUK
| | - Scott L. Cockroft
- EaStCHEM School of ChemistryUniversity of Edinburgh, Joseph Black BuildingDavid Brewster RoadEdinburghEH9 3FJUK
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31
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Dominelli-Whiteley N, Brown JJ, Muchowska KB, Mati IK, Adam C, Hubbard TA, Elmi A, Brown AJ, Bell IAW, Cockroft SL. Strong Short-Range Cooperativity in Hydrogen-Bond Chains. Angew Chem Int Ed Engl 2017. [DOI: 10.1002/ange.201703757] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Nicholas Dominelli-Whiteley
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - James J. Brown
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - Kamila B. Muchowska
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - Ioulia K. Mati
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - Catherine Adam
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - Thomas A. Hubbard
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | - Alex Elmi
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
| | | | - Ian A. W. Bell
- Afton Chemical Limited; London Road Bracknell Berkshire RG12 2UW UK
| | - Scott L. Cockroft
- EaStCHEM School of Chemistry; University of Edinburgh, Joseph Black Building; David Brewster Road Edinburgh EH9 3FJ UK
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Cecchini MM, Reale S, Manini P, d'Ischia M, De Angelis F. Modeling Fungal Melanin Buildup: Biomimetic Polymerization of 1,8-Dihydroxynaphthalene Mapped by Mass Spectrometry. Chemistry 2017; 23:8092-8098. [DOI: 10.1002/chem.201701951] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2017] [Indexed: 11/11/2022]
Affiliation(s)
- Martina Maya Cecchini
- Department of Physical and Chemical Sciences; University of L'Aquila; Via Vetoio Coppito, L'Aquila Italy
| | - Samantha Reale
- Department of Physical and Chemical Sciences; University of L'Aquila; Via Vetoio Coppito, L'Aquila Italy
| | - Paola Manini
- Department of Chemical Sciences, University of Naples “Federico II”-; Faculties of Monte Sant'Angelo; Via Cinthia Naples Italy
| | - Marco d'Ischia
- Department of Chemical Sciences, University of Naples “Federico II”-; Faculties of Monte Sant'Angelo; Via Cinthia Naples Italy
| | - Francesco De Angelis
- Department of Physical and Chemical Sciences; University of L'Aquila; Via Vetoio Coppito, L'Aquila Italy
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Povie G, Ford L, Pozzi D, Soulard V, Villa G, Renaud P. Catechols as Sources of Hydrogen Atoms in Radical Deiodination and Related Reactions. Angew Chem Int Ed Engl 2016. [DOI: 10.1002/ange.201604950] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Guillaume Povie
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
| | - Leigh Ford
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
| | - Davide Pozzi
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
| | - Valentin Soulard
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
| | - Giorgio Villa
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
| | - Philippe Renaud
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
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Povie G, Ford L, Pozzi D, Soulard V, Villa G, Renaud P. Catechols as Sources of Hydrogen Atoms in Radical Deiodination and Related Reactions. Angew Chem Int Ed Engl 2016; 55:11221-5. [DOI: 10.1002/anie.201604950] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/20/2016] [Indexed: 12/31/2022]
Affiliation(s)
- Guillaume Povie
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
| | - Leigh Ford
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
| | - Davide Pozzi
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
| | - Valentin Soulard
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
| | - Giorgio Villa
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
| | - Philippe Renaud
- Department of Chemistry and Biochemistry; University of Bern; Freiestrasse 3 3012 Bern Switzerland
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Amorati R, Baschieri A, Morroni G, Gambino R, Valgimigli L. Peroxyl Radical Reactions in Water Solution: A Gym for Proton-Coupled Electron-Transfer Theories. Chemistry 2016; 22:7924-34. [DOI: 10.1002/chem.201504492] [Citation(s) in RCA: 46] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/09/2015] [Indexed: 12/14/2022]
Affiliation(s)
- Riccardo Amorati
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
| | - Andrea Baschieri
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
| | - Gloria Morroni
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
| | - Rossana Gambino
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
| | - Luca Valgimigli
- Department of Chemistry “G. Ciamician”; University of Bologna; Via S. Giacomo 11 40126 Bologna Italy
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Lee R, Gryn'ova G, Ingold KU, Coote ML. Why are sec-alkylperoxyl bimolecular self-reactions orders of magnitude faster than the analogous reactions of tert-alkylperoxyls? The unanticipated role of CH hydrogen bond donation. Phys Chem Chem Phys 2016; 18:23673-9. [DOI: 10.1039/c6cp04670c] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Theory reveals that pri- and sec-alkylperoxyl bimolecular self-reactions are orders of magnitude faster than the analogous tert-alkylperoxyl reactions, because of the formation of 5-center cyclic CH⋯O hydrogen bonding.
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Affiliation(s)
- Richmond Lee
- ARC Centre of Excellence for Electromaterials Science
- Research School of Chemistry
- Australian National University
- Canberra ACT 2601
- Australia
| | - Ganna Gryn'ova
- ARC Centre of Excellence for Electromaterials Science
- Research School of Chemistry
- Australian National University
- Canberra ACT 2601
- Australia
| | | | - Michelle L. Coote
- ARC Centre of Excellence for Electromaterials Science
- Research School of Chemistry
- Australian National University
- Canberra ACT 2601
- Australia
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37
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Amorati R, Zotova J, Baschieri A, Valgimigli L. Antioxidant Activity of Magnolol and Honokiol: Kinetic and Mechanistic Investigations of Their Reaction with Peroxyl Radicals. J Org Chem 2015; 80:10651-9. [PMID: 26447942 DOI: 10.1021/acs.joc.5b01772] [Citation(s) in RCA: 82] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Abstract
Magnolol and honokiol, the bioactive phytochemicals contained in Magnolia officinalis, are uncommon antioxidants bearing isomeric bisphenol cores substituted with allyl functions. We have elucidated the chemistry behind their antioxidant activity by experimental and computational methods. In the inhibited autoxidation of cumene and styrene at 303 K, magnolol trapped four peroxyl radicals, with a kinh of 6.1 × 10(4) M(-1) s(-1) in chlorobenzene and 6.0 × 10(3) M(-1) s(-1) in acetonitrile, and honokiol trapped two peroxyl radicals in chlorobenzene (kinh = 3.8 × 10(4) M(-1) s(-1)) and four peroxyl radicals in acetonitrile (kinh = 9.5 × 10(3) M(-1) s(-1)). Their different behavior arises from a combination of intramolecular hydrogen bonding among the reactive OH groups (in magnolol) and of the OH groups with the aromatic and allyl π-systems, as confirmed by FT-IR spectroscopy and DFT calculations. Comparison with structurally related 3,3',5,5'-tetramethylbiphenyl-4,4'-diol, 2-allylphenol, and 2-allylanisole allowed us to exclude that the antioxidant behavior of magnolol and honokiol is due to the allyl groups. The reaction of the allyl group with a peroxyl radical (C-H hydrogen abstraction) proceeds with rate constant of 1.1 M(-1) s(-1) at 303 K. Magnolol and honokiol radicals do not react with molecular oxygen and produce no superoxide radical under the typical settings of inhibited autoxidations.
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Affiliation(s)
- Riccardo Amorati
- Department of Chemistry "G. Ciamician", University of Bologna , Via S. Giacomo 11, 40126 Bologna, Italy
| | - Julija Zotova
- Department of Chemistry "G. Ciamician", University of Bologna , Via S. Giacomo 11, 40126 Bologna, Italy
| | - Andrea Baschieri
- Department of Chemistry "G. Ciamician", University of Bologna , Via S. Giacomo 11, 40126 Bologna, Italy
| | - Luca Valgimigli
- Department of Chemistry "G. Ciamician", University of Bologna , Via S. Giacomo 11, 40126 Bologna, Italy
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38
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Kareem HS, Ariffin A, Nordin N, Heidelberg T, Abdul-Aziz A, Kong KW, Yehye WA. Correlation of antioxidant activities with theoretical studies for new hydrazone compounds bearing a 3,4,5-trimethoxy benzyl moiety. Eur J Med Chem 2015; 103:497-505. [PMID: 26402727 DOI: 10.1016/j.ejmech.2015.09.016] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/02/2015] [Revised: 09/06/2015] [Accepted: 09/10/2015] [Indexed: 01/22/2023]
Abstract
A new series of antioxidants, namely imines bearing the well-known free radical scavenger group 3,4,5-trimethoxybenzyloxy, was designed and synthesized. Theoretical calculations based on density functional theory (DFT) were performed to understand the antioxidant activities. Experimental studies evaluating the antioxidant activities of the compounds using DPPH and FRAP assays verified the predictions obtained by DMOL3 based on DFT.1. The DPPH radical scavenging activities depended on the substitution pattern of the aromatic aldehyde, with both the substitution type and position showing significant effects. Compounds 7b, 7c and 7d, which contain a phenolic hydroxyl group at the para position to the imine as well as, additional electron donating groups at the ortho-position to this hydroxyl group, exhibited IC₅₀ values of 62, 75 and 106 μg/mL, respectively, and potent antioxidant activities against DPPH, which were better than that of the reference compound BHT. With the exception of compounds 7a and 7h with a phenolic hydroxyl group at the ortho position, all of the investigated compounds exhibited ferric reducing activities above 1000 μM. Correlation analysis between the two antioxidant assays revealed moderate positive correlation (r = 0.59), indicating differing antioxidant activities based on the reaction mechanism. Therefore, imines bearing a 3,4,5-trimethoxybenzyloxy group can be proposed as potential antioxidants for tackling oxidative stress.
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Affiliation(s)
- Huda S Kareem
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia; General Directorate of Curricula, Ministry of Education, Baghdad 3310, Iraq
| | - Azhar Ariffin
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia.
| | - Nurdiana Nordin
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Thorsten Heidelberg
- Department of Chemistry, Faculty of Science, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Azlina Abdul-Aziz
- Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Kin Weng Kong
- Department of Molecular Medicine, Faculty of Medicine, University of Malaya, Kuala Lumpur 50603, Malaysia
| | - Wageeh A Yehye
- Nanotechnology & Catalysis Research Centre (NANOCAT), University of Malaya, Block 3A, Institute of Postgraduate Studies Building, Kuala Lumpur 50603, Malaysia
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Antiradical and reductant activities of anthocyanidins and anthocyanins, structure-activity relationship and synthesis. Food Chem 2015; 194:1275-82. [PMID: 26471682 DOI: 10.1016/j.foodchem.2015.09.003] [Citation(s) in RCA: 75] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2015] [Revised: 07/21/2015] [Accepted: 09/02/2015] [Indexed: 11/23/2022]
Abstract
Eight anthocyanidins, seven anthocyanins and two synthesized 4'-hydroxy flavyliums were examined as hydrogen donors to DPPH, ABTS and hydroxyl radicals, and as electron donors in the FRAP assay. Most compounds gave better activities than trolox and catechol. A structure-activity relationship (SAR) study showed that, in the absence of the 3-OH group, radicals of the 4, 5 or 7-OH groups can only be stabilized by resonance through pyrylium oxygen, while 3-OH group improved hydrogen atom donation because of the stabilization by anthocyanidin semiquinone-like resonance. Electron donation was also enhanced by the 3-OH group. Both anthocyanidins and their respective anthocyanins showed similar trends and close activities. Different types of sugar unit bonded to the 3-OH group or counter ion had minor effect on activities. The catechol structure improved both hydrogen and electron donation. Compounds lacking the catechol structure had a decreasing order of H-atom and electron donation (Mv>Pn>Pg>Ap>4'-OH-flavylium) consistent with the decreasing number of their hydroxyl and/or methoxy groups.
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40
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A theoretical study of the antioxidant properties of phenolic acid amides investigated through the radical-scavenging and metal chelation mechanisms. Eur Food Res Technol 2015. [DOI: 10.1007/s00217-015-2484-0] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
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41
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Younai A, Zeng BS, Meltzer HY, Scheidt KA. Enantioselective Syntheses of Heteroyohimbine Natural Products: A Unified Approach through Cooperative Catalysis. Angew Chem Int Ed Engl 2015. [DOI: 10.1002/ange.201502011] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/01/2023]
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Younai A, Zeng BS, Meltzer HY, Scheidt KA. Enantioselective Syntheses of Heteroyohimbine Natural Products: A Unified Approach through Cooperative Catalysis. Angew Chem Int Ed Engl 2015; 54:6900-4. [DOI: 10.1002/anie.201502011] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2015] [Indexed: 12/28/2022]
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Nakanishi I, Ohkubo K, Imai K, Kamibayashi M, Yoshihashi Y, Matsumoto KI, Fukuhara K, Terada K, Itoh S, Ozawa T, Fukuzumi S. Solubilisation of a 2,2-diphenyl-1-picrylhydrazyl radical in water by β-cyclodextrin to evaluate the radical-scavenging activity of antioxidants in aqueous media. Chem Commun (Camb) 2015; 51:8311-4. [DOI: 10.1039/c5cc02236c] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
A 2,2-diphenyl-1-picrylhydrazyl radical was solubilised in water by β-cyclodextrin.
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Ali HM, Ali IH. QSAR and mechanisms of radical scavenging activity of phenolic and anilinic compounds using structural, electronic, kinetic, and thermodynamic parameters. Med Chem Res 2014. [DOI: 10.1007/s00044-014-1174-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Korth HG, Mulder P. Anthrone and related hydroxyarenes: tautomerization and hydrogen bonding. J Org Chem 2013; 78:7674-82. [PMID: 23815684 DOI: 10.1021/jo401243b] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
Abstract
The keto-enolization of hydroxyl-substituted naphthols and 9-anthrols has been investigated by means of CBS-QB3 calculations. An excellent agreement between experiment and theory is found for the energetics for the anthrone (5) ⇌ anthrol (6) equilibrium, with an enthalpy of tautomerization, Δ(t)H, of 3.8 kcal mol(-1). In contrast, 1-naphthol is the preferred tautomer with a Δ(t)H = -9.0 kcal mol(-1). Substitution of the hydrogens at the adjacent carbons by hydroxyl groups leads to the formation of strong intramolecular hydrogen bonds within a six-membered ring in the enones and the enols. Due to the difference in the intramolecular hydrogen bond enthalpy, Δ(HB)H(intra), the equilibrium shifts further to the enone. Thus, for 1,8-dihydroxy-anthrone (anthralin, dithranol) Δ(t)H increases to 12.7 kcal mol(-1) with an enol/enone ratio of 10(-10). The solvent effect on the 5 ⇌ 6 equilibrium has been quantified by considering the formation of intermolecular hydrogen bond(s), leading to an acidity parameter α₂(H) for anthrol of 0.42. It is shown that the hydrogen bond donating ability of bulk methanol is greatly attenuated through the formation of cyclic oligomers. The benzylic and phenolic bond dissociation enthalpies for anthrone up to anthralin suggest some antioxidant potency but the precise (radical) mechanism of action remains uncertain.
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Affiliation(s)
- Hans-Gert Korth
- Institut für Organische Chemie, Universität Duisburg-Essen, D-45117 Essen, Germany.
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Structural features, kinetics and SAR study of radical scavenging and antioxidant activities of phenolic and anilinic compounds. Chem Cent J 2013; 7:53. [PMID: 23497653 PMCID: PMC3617008 DOI: 10.1186/1752-153x-7-53] [Citation(s) in RCA: 62] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/20/2012] [Accepted: 02/21/2013] [Indexed: 11/10/2022] Open
Abstract
BACKGROUND Phenolic compounds are widely distributed in plant kingdom and constitute one of the most important classes of natural and synthetic antioxidants. In the present study fifty one natural and synthetic structurally variant phenolic, enolic and anilinic compounds were examined as antioxidants and radical scavengers against DPPH, hydroxyl and peroxyl radicals. The structural diversity of the used phenolic compounds includes monophenols with substituents frequently present in natural phenols e.g. alkyl, alkoxy, ester and carboxyl groups, besides many other electron donating and withdrawing groups, in addition to polyphenols with 1-3 hydroxyl groups and aminophenols. Some common groups e.g. alkyl, carboxyl, amino and second OH groups were incorporated in ortho, meta and para positions. RESULTS SAR study indicates that the most important structural feature of phenolic compounds required to possess good antiradical and antioxidant activities is the presence of a second hydroxyl or an amino group in o- or p-position because of their strong electron donating effect in these positions and the formation of a stable quinone-like products upon two hydrogen-atom transfer process; otherwise, the presence of a number of alkoxy (in o or p-position) and /or alkyl groups (in o, m or p-position) should be present to stabilize the resulted phenoxyl radical and reach good activity. Anilines showed also similar structural feature requirements as phenols to achieve good activities, except o-diamines which gave low activity because of the high energy of the resulted 1,2-dimine product upon the 2H-transfer process. Enols with ene-1,2-diol structure undergo the same process and give good activity. Good correlations were obtained between DPPH inhibition and inhibition of both OH and peroxyl radicals. In addition, good correlations were obtained between DPPH inhibition and antioxidant activities in sunflower oil and liver homogenate systems. CONCLUSIONS In conclusion, the structures of good anti radical and antioxidant phenols and anilines are defined. The obtained good correlations imply that measuring anti DPPH activity can be used as a simple predictive test for the anti hydroxyl and peroxyl radical, and antioxidant activities. Kinetic measurements showed that strong antioxidants with high activity have also high reaction rates indicating that factors stabilizing the phenoxyl radicals lower also the activation energy of the hydrogen transfer process.
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47
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Spatafora C, Daquino C, Tringali C, Amorati R. Reaction of benzoxanthene lignans with peroxyl radicals in polar and non-polar media: cooperative behaviour of OH groups. Org Biomol Chem 2013; 11:4291-4. [DOI: 10.1039/c3ob40723c] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Hansen PE, Spanget-Larsen J. On prediction of OH stretching frequencies in intramolecularly hydrogen bonded systems. J Mol Struct 2012. [DOI: 10.1016/j.molstruc.2012.01.011] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/14/2022]
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Varfolomeev MA, Klimovitskii AE, Abaidullina DI, Madzhidov TI, Solomonov BN. "Additive" cooperativity of hydrogen bonds in complexes of catechol with proton acceptors in the gas phase: FTIR spectroscopy and quantum chemical calculations. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2012; 91:75-82. [PMID: 22366617 DOI: 10.1016/j.saa.2012.01.061] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2011] [Revised: 01/16/2012] [Accepted: 01/24/2012] [Indexed: 05/31/2023]
Abstract
Experimental study of hydrogen bond cooperativity in hetero-complexes in the gas phase was carried out by IR-spectroscopy method. Stretching vibration frequencies of O-H groups in phenol and catechol molecules as well as of their complexes with nitriles and ethers were determined in the gas phase using a specially designed cell. O-H groups experimental frequency shifts in the complexes of catechol induced by the formation of intermolecular hydrogen bonds are significantly higher than in the complexes of phenol due to the hydrogen bond cooperativity. It was shown that the cooperativity factors of hydrogen bonds in the complexes of catechol with nitriles and ethers in the gas phase are approximately the same. Quantum chemical calculations of the studied systems have been performed using density functional theory (DFT) methods. It was shown, that theoretically obtained cooperativity factors of hydrogen bonds in the complexes of catechol with proton acceptors are in good agreement with experimental values. Cooperative effects lead to a strengthening of intermolecular hydrogen bonds in the complexes of catechol on about 30%, despite the significant difference in the proton acceptor ability of the bases. The analysis within quantum theory of atoms in molecules was carried out for the explanation of this fact.
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Affiliation(s)
- Mikhail A Varfolomeev
- Department of Physical Chemistry, Chemical Institute, Kazan (Volga region) Federal University, Kremlevskaya 18, 420008 Kazan, Russia.
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Amorati R, Valgimigli L. Modulation of the antioxidant activity of phenols by non-covalent interactions. Org Biomol Chem 2012; 10:4147-58. [DOI: 10.1039/c2ob25174d] [Citation(s) in RCA: 115] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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