1
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Eryilmaz S, Bagdatli E. Structural characterization and keto-enol tautomerization of 4-substituted pyrazolone derivatives with DFT approach. J Mol Graph Model 2024; 131:108814. [PMID: 38968767 DOI: 10.1016/j.jmgm.2024.108814] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2023] [Revised: 04/19/2024] [Accepted: 06/17/2024] [Indexed: 07/07/2024]
Abstract
The synthesis of two pyrazolone derivative compounds, PYR-I(4-Acetyl-1-(4-chlorophenyl)-3-isopropyl-1H-pyrazol-5(4H)-one) and PYR-II1-(4-Chlorophenyl))-3-isopropyl-5-oxo-4,5-5-dihydro-1H-pyrazole-4-carbaldehyde, their characterization by FT-IR, NMR, UV-Vis and GC-MS techniques, and the evaluation of the keto-enol tautomerization process of the structures along with the DFT approach and spectral data were reported in this paper. Spectral findings indicated that PYR-I was stable at the keto state. The IR spectrum recorded in solid form showed that the PYR-II structure was stable in the enol state, while the NMR spectrum in the solution medium showed that it was stable in the keto state. DFT-based analyses were realized with the B3LYP hybrid functional and the 6-311++G(d,p) basis set. The modelled keto, transition and enol state molecular geometries of structures were optimized in the gas phase and different solvent media and the total energy and dipole moment values were investigated at the specified theoretical level. The possible keto-enol tautomerism mechanism of the structures was evaluated through some thermodynamic parameters such as the difference in free Gibbs energy (ΔG), enthalpy (ΔH), entropy (ΔS), and predictive tautomeric equilibrium constants (Keq), acidity constants (pKa) and percentages of tautomers at 298.15 K and 1 atm pressure. The results of these analyses based on the DFT approach indicated that the keto-enol tautomer equilibrium heavily favours the keto form for PYR-I and the enol form for PYR-II in all cases. Moreover, natural bond orbital (NBO) analysis was performed for the tautomers, and the chemical reactivity profiles of the most stable tautomers were examined with the values of frontier molecular orbital energy and some reactivity descriptors.
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Affiliation(s)
- Serpil Eryilmaz
- Department of Physics, Faculty of Arts and Sciences, Amasya University, 05100, Amasya, Turkey.
| | - Emine Bagdatli
- Department of Chemistry, Faculty of Arts and Sciences, Ordu University, 52200, Ordu, Turkey
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2
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Ghoneim MM, Abdelgawad MA, Elkanzi NAA, Bakr RB. Review of the recent advances of pyrazole derivatives as selective COX-2 inhibitors for treating inflammation. Mol Divers 2024:10.1007/s11030-024-10906-9. [PMID: 39014146 DOI: 10.1007/s11030-024-10906-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2024] [Accepted: 05/30/2024] [Indexed: 07/18/2024]
Abstract
Pyrazole heterocycle is regarded as an extremely significant agent for the therapy of inflammation. Celecoxib, lonazolac, deracoxib, and phenylbutazone are examples of commercially approved pyrazole drugs with COX-2 inhibitory potential for curing inflammation. There have been recently many reviews for the biological significance of pyrazole derivatives. This review talks about pyrazole derivatives with anti-inflammatory activity and also sheds the light on the recent updates on pyrazole research with an emphasis on some synthetic pathways utilized to construct this privileged scaffold and structure activity relationship that accounts for the anti-inflammatory activity in an attempt to pave the opportunity for medicinal chemists to develop novel anti-inflammatory agents with better COX-2 selectivity.
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Affiliation(s)
- Mohammed M Ghoneim
- Department of Pharmacy Practice, College of Pharmacy, AlMaarefa University, Ad Diriyah, 13713, Saudi Arabia
| | - Mohamed A Abdelgawad
- Department of Pharmaceutical Chemistry, College of Pharmacy, Jouf University, Sakaka, 72388, Saudi Arabia.
| | - Nadia A A Elkanzi
- Chemistry Department, College of Science, Jouf University, P.O. Box: 2014, Sakaka, Saudi Arabia
| | - Rania B Bakr
- Pharmaceutical Organic Chemistry Department, Faculty of Pharmacy, Beni-Suef University, 62514, Beni-Suef, Egypt.
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3
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Noser AA, Ibrahim SA, Saad-Allah KM, Salem MM, Baren MH. Facile One-Pot Three Component Synthesis, Characterization, and Molecular Docking Simulations of Novel α-Aminophosphonate Derivatives Based Pyrazole Moiety as Potential Antimicrobial Agent. Chem Biodivers 2023; 20:e202301035. [PMID: 37647333 DOI: 10.1002/cbdv.202301035] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Revised: 08/29/2023] [Accepted: 08/30/2023] [Indexed: 09/01/2023]
Abstract
An efficient method has been developed for the synthesis of novel α-aminophosphonates (AAP) (3 a-m) through a one-pot three-component reaction of 1,3-disubstituted-1H-pyrazol-5-amine, aromatic aldehydes, and phosphite using lithium perchlorate as catalyst. All newly synthesized compounds were characterized via different spectroscopic techniques. The synthesized compounds' mode of action was investigated using molecular docking against the outer membrane protein A (OMPA) and exo-1,3-β-glucanase, with interpreting their pharmacokinetics aspects. The results of the antimicrobial effectiveness of these compounds revealed a broad spectrum of their biocidal activity and this in-vitro study was in line with the in- silico results. Additionally, it has been demonstrated that these compounds exhibited a minimum inhibitory concentration (MIC) with significant activity at low concentrations (7.5-30.0 mg/mL). Further, the radical scavenging (DPPH* ) activity of the synthesized compounds fluctuated, with compounds 3 h, 3 a, and 3 f showing the highest antioxidant activity. Overall, the formulated compounds can be employed as antimicrobial and antioxidant agents in medical applications.
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Affiliation(s)
- Ahmed A Noser
- Organic Chemistry, Chemistry Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt
| | - Seham A Ibrahim
- Organic Chemistry, Chemistry Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt
| | - Khalil M Saad-Allah
- Botany Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt
| | - Maha M Salem
- Biochemistry Division, Chemistry Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt
| | - Mohamed H Baren
- Organic Chemistry, Chemistry Department, Faculty of Science, Tanta University, Tanta, 31527, Egypt
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4
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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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5
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Tatheer A, Murtaza S, Kausar N, Altaf AA, Kausar S, Ahmed S, Muhammad S, Hussain A. Synthesis, theoretical investigations and biological evaluation of ibuprofen drug hybrids. Med Chem Res 2022. [DOI: 10.1007/s00044-022-02955-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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6
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Mustafa G, Zia-ur-Rehman M, Sumrra SH, Ashfaq M, Zafar W, Ashfaq M. A critical review on recent trends on pharmacological applications of pyrazolone endowed derivatives. J Mol Struct 2022. [DOI: 10.1016/j.molstruc.2022.133044] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
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7
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Dhibi M, Khdhiri E, Ayedi MA, Abid S, Ammar H. Microwave-assisted synthesis and reactivity of new 5-amino-1H-pyrazole derivatives bearing 2-furoyl moieties. SYNTHETIC COMMUN 2022. [DOI: 10.1080/00397911.2022.2095213] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
Affiliation(s)
- Manel Dhibi
- Laboratoire de Chimie Appliquée “Hétérocycles Corps Gras & Polymères”, Faculté des Sciences, Université de Sfax, Sfax, Tunisie
| | - Emna Khdhiri
- Laboratoire de Chimie Appliquée “Hétérocycles Corps Gras & Polymères”, Faculté des Sciences, Université de Sfax, Sfax, Tunisie
| | - Mohamed Ali Ayedi
- Laboratoire de Chimie Appliquée “Hétérocycles Corps Gras & Polymères”, Faculté des Sciences, Université de Sfax, Sfax, Tunisie
| | - Souhir Abid
- Chemistry Department, College of Science and Arts, Jouf University, Jouf, Saudi Arabia
| | - Houcine Ammar
- Laboratoire de Chimie Appliquée “Hétérocycles Corps Gras & Polymères”, Faculté des Sciences, Université de Sfax, Sfax, Tunisie
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8
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Spiegel M. Current Trends in Computational Quantum Chemistry Studies on Antioxidant Radical Scavenging Activity. J Chem Inf Model 2022; 62:2639-2658. [PMID: 35436117 PMCID: PMC9198981 DOI: 10.1021/acs.jcim.2c00104] [Citation(s) in RCA: 28] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
![]()
The antioxidative
nature of chemicals is now routinely studied
using computational quantum chemistry. Scientists are constantly proposing
new approaches to investigate those methods, and the subject is evolving
at a rapid pace. The goal of this review is to collect, consolidate,
and present current trends in a clear, methodical, and reference-rich
manner. This paper is divided into several sections, each of which
corresponds to a different stage of elaborations: preliminary concerns,
electronic structure analysis, and general reactivity (thermochemistry
and kinetics). The sections are further subdivided based on methodologies
used. Concluding remarks and future perspectives are presented based
on the remaining elements.
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Affiliation(s)
- Maciej Spiegel
- Department of Pharmacognosy and Herbal Medicines, Wroclaw Medical University, Borowska 211A, 50-556 Wroclaw, Poland
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9
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Kamalı A, Çakmak R, Boğa M. Anticholinesterase and antioxidant activities of novel heterocyclic Schiff base derivatives containing an aryl sulfonate moiety. J CHIN CHEM SOC-TAIP 2022. [DOI: 10.1002/jccs.202100511] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Ayfer Kamalı
- Department of Medical Services and Techniques, Medical Laboratory Techniques Program, Vocational School of Health Services Batman University Batman Turkey
| | - Reşit Çakmak
- Department of Medical Services and Techniques, Medical Laboratory Techniques Program, Vocational School of Health Services Batman University Batman Turkey
| | - Mehmet Boğa
- Department of Analytical Chemistry, Faculty of Pharmacy Dicle University Diyarbakır Turkey
- Dicle University Health Sciences Application and Research Center (DÜSAM) Diyarbakır Turkey
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10
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Abuelela AM, Soliman UA, El-hagali GA, Zoghaib WM, Mohamed TA. Synthetic routes and vibrational analysis of 5-(4-Chlorophenyl) -3H-pyrazol-3-one molecule: Raman, Infrared and DFT calculations. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.131036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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11
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Çınar E, Başaran E, Erdoğan Ö, Çakmak R, Boğa M, Çevik Ö. Heterocyclic Schiff base derivatives containing pyrazolone moiety: Synthesis, characterization, and in vitro biological studies. J CHIN CHEM SOC-TAIP 2021. [DOI: 10.1002/jccs.202100357] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Ercan Çınar
- Department of Nursing, Faculty of Health Sciences Batman University Batman Turkey
| | - Eyüp Başaran
- Department of Chemistry and Chemical Processing Technologies, Vocational School of Technical Sciences Batman University Batman Turkey
| | - Ömer Erdoğan
- Department of Biochemistry, Faculty of Medicine Adnan Menderes University Aydın Turkey
| | - Reşit Çakmak
- Medical Laboratory Techniques Program, Vocational School of Health Services Batman University Batman Turkey
| | - Mehmet Boğa
- Department of Analytical Chemistry, Faculty of Pharmacy Dicle University Diyarbakır Turkey
| | - Özge Çevik
- Department of Biochemistry, Faculty of Medicine Adnan Menderes University Aydın Turkey
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12
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Ertürk Ö, Değirmenci A, Yurdakul Ertürk E, Atlı Şekeroğlu Z, Çol Ayvaz M, Kontaş Yedier S. Antimicrobial, antioxidant and cytotoxic activities of some analgesic or anti‐inflammatory drugs. Biologia (Bratisl) 2021. [DOI: 10.1007/s11756-021-00755-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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13
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How the functional group substitution and solvent effects affect the antioxidant activity of (+)-catechin? J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.114818] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2023]
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14
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Yakypova LR, Baeva LA, Safiullin RL. Reactivity of Peroxyl Radicals with 5-Methyl-4-[(Propylsulfanyl)methyl]-2,4-Dihydro-3H-Pyrazol-3-one. KINETICS AND CATALYSIS 2021. [DOI: 10.1134/s0023158421010134] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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15
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Ramadan AM, Elsamra RM, Bondock S. New pyrazole‐4‐carbothioamide‐based metal complexes: Synthesis, spectral characterization, computational, antimicrobial, and antitumor investigations. Appl Organomet Chem 2020. [DOI: 10.1002/aoc.6102] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/09/2023]
Affiliation(s)
- Ahmed M. Ramadan
- Chemistry Department, Faculty of Science Alexandria University Alexandria Egypt
- Chemistry Department, Faculty of Science King Khalid University Abha Saudi Arabia
| | - Rehab M.I. Elsamra
- Chemistry Department, Faculty of Science Alexandria University Alexandria Egypt
| | - Samir Bondock
- Chemistry Department, Faculty of Science King Khalid University Abha Saudi Arabia
- Chemistry Department, Faculty of Science Mansoura University Mansoura Egypt
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16
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Marín-Luna M, Claramunt RM, Elguero J, Alkorta I. Theoretical and Spectroscopic Characterization of API-Related Azoles in Solution and in Solid State. Curr Pharm Des 2020; 26:4847-4857. [PMID: 32811407 DOI: 10.2174/1381612826666200818212846] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2019] [Accepted: 06/27/2020] [Indexed: 12/13/2022]
Abstract
Azoles are a family of five-membered azacyclic compounds with relevant biological and pharmacological activity. Different subclasses of azoles are defined depending on the atomic arrangement and the number of nitrogen atoms present in the ring: pyrazoles, indazoles, imidazoles, benzimidazoles, triazoles, benzotriazoles, tetrazoles and pentazoles. The complete characterization of their structure and the knowledge about their crystal packing and physical and chemical properties are of vital importance for the advancement in the design of new azole-containing drugs. In this review, we report the latest recent contributions to azole chemistry, in particular, those in which theoretical studies have been performed.
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Affiliation(s)
- Marta Marín-Luna
- Departamento de Química Orgánica, Facultad de Química, Universidad de Murcia, Regional Campus of International Excellence "Campus Mare Nostrum", 30100 Murcia, Spain
| | - Rosa M Claramunt
- Departamento de Química Orgánica y Bio-Orgánica, Facultad de Ciencias, UNED, Paseo Senda del Rey, 9, E-28040 Madrid, Spain
| | - José Elguero
- Instituto de Química Médica, CSIC, Juan de la Cierva, 3, E-28006 Madrid, Spain
| | - Ibon Alkorta
- Instituto de Química Médica, CSIC, Juan de la Cierva, 3, E-28006 Madrid, Spain
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17
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Abumelha HM. Synthesis and antioxidant assay of new nicotinonitrile analogues clubbed thiazole, pyrazole and/or pyridine ring systems. J Heterocycl Chem 2020. [DOI: 10.1002/jhet.3820] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Affiliation(s)
- Hana M.A. Abumelha
- Department of Chemistry, Faculty of SciencePrincess Nourah Bint Abdulrahman University Riyadh Saudi Arabia
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18
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Erez ME, Dalar A, Fidan M, Pınar SM. Comprehensive appraisement of antioxidant potential and phytochemical profile of native botanicals from Turkey. JOURNAL OF FOOD MEASUREMENT AND CHARACTERIZATION 2019. [DOI: 10.1007/s11694-019-00245-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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19
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Orabi MAA, Orabi EA, Taniguchi S, Sakagami H, Yoshimura M, Amakura Y, Hatano T. Structures, NMR Spectroscopic Features, and Cytotoxic Properties of Oligomeric Hellinoyl ( m-GO- m-GOG)-Type Ellagitannins from the Galls of Tamarix aphylla. JOURNAL OF NATURAL PRODUCTS 2019; 82:2682-2695. [PMID: 31532650 DOI: 10.1021/acs.jnatprod.9b00073] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Ellagitannin oligomers are large molecules habitually showing complex NMR spectra that are sometimes misinterpreted and lead to incorrect structures. Understanding the NMR spectroscopic features of a group of ellagitannins would overcome these inadequacies. In this study, investigation of the galls of Tamarix aphylla led to the isolation of three new ellagitannin oligomers, phyllagallins T1 (1), T2 (2), and Q1 (3), a known monomer nilotinin M4 (4), four known dimers, nilotinins D7 (5) and D8 (6), hirtellin B (7), and tamarixinin A (8), and a simple phenolic, dehydrotrigallic acid (9). 1D and 2D NMR, HRESI-TOFMS, and ECD experiments show that compounds 1-8 are hellinoyl-type ellagitannins. The NMR spectroscopic features of this type of ellagitannins and the reasons for the abnormal upfield shifts of glucose anomeric proton and hellinoyl moiety proton signals are established considering the experimental results as well as quantum chemical calculation on a simple hellinoyl-type monomer, phyllagallin M2. Based on these results, the NMR assignments reported previously by a different research group for bracteatinin T1 and hirtellin T3 are revised. A cytotoxicity study against human oral squamous cell carcinoma cell lines (Ca9-22, HSC-2, and HSC-4) and human mesenchymal normal oral cells (HGF, HPC, and HPLF) showed cytotoxic effects with tumor-specificity higher than 5.2, 3.0, 1.6, and 2.0 for compounds 5, 2, 9, and 3, respectively.
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Affiliation(s)
- Mohamed A A Orabi
- Faculty of Pharmacy , Al-Azhar University , Assiut 71524 , Egypt
- College of Pharmacy , Najran University , Najran 55461 , Kingdom of Saudi Arabia
| | - Esam A Orabi
- Department of Chemistry , University of Manitoba , Winnipeg , Manitoba R3T 2N2 , Canada
- Department of Chemistry, Faculty of Science , Assiut University , Assiut 71516 , Egypt
| | - Shoko Taniguchi
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences , Okayama University , Tsushima , Okayama 700-8530 , Japan
| | - Hiroshi Sakagami
- Meikai University Research Institute of Odontology (M-RIO) , Meikai University School of Dentistry , 1-1 Keyakidai , Sakado-shi , Saitama 350-0283 , Japan
| | - Morio Yoshimura
- College of Pharmaceutical Sciences , Matsuyama University , Bunkyo-cho , Matsuyama 790-8578 , Japan
| | - Yoshiaki Amakura
- College of Pharmaceutical Sciences , Matsuyama University , Bunkyo-cho , Matsuyama 790-8578 , Japan
| | - Tsutomu Hatano
- Graduate School of Medicine, Dentistry and Pharmaceutical Sciences , Okayama University , Tsushima , Okayama 700-8530 , Japan
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20
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Chaudhry F, Asif N, Naureen S, Munawar MA, Khan MA. On Efficient Synthesis, X‐Ray Analysis and DPPH Radical Scavenging Activity of Pyrazolone‐Based
trans
‐Chalcones. ChemistrySelect 2019. [DOI: 10.1002/slct.201902671] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Faryal Chaudhry
- Institute of the ChemistryQuaid-e-Azam CampusUniversity of the Punjab Lahore- 54590 Pakistan
- Department of ChemistryKinnaird College for Women Lahore 93-Jail Road Lahore- 54000 Pakistan
| | - Nadia Asif
- Institute of the ChemistryQuaid-e-Azam CampusUniversity of the Punjab Lahore- 54590 Pakistan
| | - Sadia Naureen
- Institute of the ChemistryQuaid-e-Azam CampusUniversity of the Punjab Lahore- 54590 Pakistan
| | - Munawar Ali Munawar
- Institute of the ChemistryQuaid-e-Azam CampusUniversity of the Punjab Lahore- 54590 Pakistan
| | - Misbahul Ain Khan
- Institute of the ChemistryQuaid-e-Azam CampusUniversity of the Punjab Lahore- 54590 Pakistan
- Department of Chemistrythe Islamia University of Bahawalpur Bahawalpur 63100 Pakistan
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21
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Orabi EA, Peslherbe GH. Computational insight into hydrogen persulfide and a new additive model for chemical and biological simulations. Phys Chem Chem Phys 2019; 21:15988-16004. [PMID: 31297500 DOI: 10.1039/c9cp02998b] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
S-Sulfhydration of cysteine to the Cys-SSH persulfide is an oxidative post-translational modification that plays an important regulatory role in many physiological systems. Though hydrogen persulfide (H2S2) has recently been established as a signaling and cellular sulfhydration reagent, the chemistry and chemical biology of persulfides remain poorly explored. We first report an extensive high-level ab initio quantum chemical investigation of (H2S2)n, (H2S2)m·H2O, and (H2O)m·H2S2 clusters (n = 1-3 and m = 1, 2) and of H2S2 complexes with 19 compounds that model the side chains of naturally-occurring amino acids. The high polarizability of S necessitates the use of large, very diffuse, basis sets for proper description of H2S2 and its complexes. H2S2 possesses a skewed equilibrium geometry, with nonpolar trans and more polar cis conformers 6 and 8 kcal mol-1 higher in energy, respectively; the skewed conformation is preserved in all neutral and cationic complexes while a cis geometry prevails in some anionic complexes. H2S2 is found to be a better H-bond donor and a poorer acceptor than H2S, and that in complexes with H2O, alcohols and amines, H2S2 is a better H-bond donor. Radical delocalization on both S atoms stabilizes the perthiyl (HSS˙) over the thiyl (HS˙) radical and results in a ∼20 kcal mol-1 lower S-H homolytic bond dissociation in H2S2, making it a potential antioxidant. A simple additive model is optimized for H2S2 and used together with the TIP3P model and the CHARMM36 all-atom force field (FF) to investigate the structure and thermodynamic properties of liquid H2S2 and the solubility of H2S2 in water, and to model H2S2-protein interactions (for which new FF parameters are further developed). Very weak H-bonding characterizes liquid H2S2 and it is found immiscible in liquid water with a trend in H-bonding strengths between H2S2 and H2O in the order O-HO ≫ S-HO > O-HS. This work does not only provide a thorough description of the structure and energetics of H2S2 and its various complexes, but also yields a reliable FF for investigating H2S2 in chemistry and biology.
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Affiliation(s)
- Esam A Orabi
- Centre for Research in Molecular Modeling and Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke Street West, Montréal, Québec H4B 1R6, Canada.
| | - Gilles H Peslherbe
- Centre for Research in Molecular Modeling and Department of Chemistry and Biochemistry, Concordia University, 7141 Sherbrooke Street West, Montréal, Québec H4B 1R6, Canada.
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Orabi EA. Tautomerism and antioxidant activity of some 4-acylpyrazolone-based Schiff bases: a theoretical study. RSC Adv 2018; 8:30842-30850. [PMID: 35548767 PMCID: PMC9085507 DOI: 10.1039/c8ra05987j] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2018] [Accepted: 08/28/2018] [Indexed: 11/23/2022] Open
Abstract
4-Acylpyrazolone Schiff bases display antimicrobial, antiprion, antioxidant, and other biological activities. They are also used as ligands and some of their complexes possess photoluminescence and anticancer properties. These Schiff bases may exist in four tautomeric forms that correspond to H at the C (imine-one(I)), N (imine-one(II)), and O (imine-ol) atoms of the pyrazolone ring or at the azomethine N atom (amine-one). While crystal structures show the amine-one form, the identity of the tautomeric form in solution and the structure–antioxidant activity relationship of these compounds are not clear. We perform quantum mechanical investigations on nine 4-acylpyrazolone-based Schiff bases at the B3LYP/6-311++G(d,p) level of theory in the gas phase and in chloroform, dimethyl sulfoxide, and water using the polarizable continuum model (PCM). Results show that the imine-ol, imine-one(I), and imine-one(II) isomers are, in respective, 6.5–8.0, 17–20, and 19–23 kcal mol−1 less stable than the amine-one form and that solvents further stabilize the later form. The energy barrier for imine-ol to amine-one conversion is only 0–1 kcal mol−1, showing that formation of the latter form is both kinetically and thermodynamically favorable. NMR calculations show that H in the amine-one and imine-ol forms appears at δ = 11.9–12.9 and 14.0–15.7 ppm, respectively, revealing that the experimentally reported 1H NMR spectra of these compounds are due to the amine-one tautomeric form. The structure–antioxidant activity relationship is investigated and structural modifications that increase the antioxidant activity are discussed. Calculations using the PCM show that the vertical ionization potential (IPV) is inversely proportional with the ferric reducing antioxidant power (FRAP) of these compounds. IPV thus presents a valuable tool for predicting the FRAP. Computational investigations reveal that 4-acylpyrazolone Schiff bases adopt the amine-one structure and that ionization potentials provide a measure for their antioxidant activity.![]()
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Affiliation(s)
- Esam A. Orabi
- Department of Chemistry
- Faculty of Science
- Assiut University
- Egypt
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