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Elagawany M, Hegazy L, Cao F, Donlin MJ, Rath N, Tavis J, Elgendy B. Identification of 4-isopropyl-thiotropolone as a novel anti-microbial: regioselective synthesis, NMR characterization, and biological evaluation. RSC Adv 2018; 8:29967-29975. [PMID: 35547306 PMCID: PMC9085298 DOI: 10.1039/c8ra06297h] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2018] [Accepted: 08/20/2018] [Indexed: 12/30/2022] Open
Abstract
We have synthesized and separated tosylated thujaplicin isomers for the first time, and elucidated their structures using 1D, 2D-NMR techniques and X-ray crystallography. The tosylated isomers were used to synthesize 4-isopropyl–thiotropolone and 6-isopropyl–thiotropolone in a regioselective manner. 1H and 13C Chemical shifts of synthesized isomers were fully assigned using several NMR experiments, and their isotropic magnetic shielding was calculated using the GIAO (Gauge Including Atomic Orbitals) method and the B3LYP def2-TZVPP level of theory. The calculated chemical shift values were in a good agreement with the experimental results. The biological activity of all synthesized compounds was evaluated against the fungal pathogen Cryptococcus neoformans and four different bacterial strains (Staphylococcus aureus (ATCC 29213), E. coli (ATCC 35218), Acinetobacter baumannii and Pseudomonas aeruginosa (ATCC 27853)). 4-Isopropyl–thiotropolone was found to inhibit Staphylococcus aureus in a low micro molar range and exhibit good therapeutic index and ADME properties. This compound can be used for future lead optimization to design inhibitors against Staphylococcus aureus (ATCC 29213). 4-Isopropyl–thiotropolone was identified as a novel anti-microbial agent with good therapeutic index and ADME properties.![]()
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Affiliation(s)
- Mohamed Elagawany
- Departments of Pharmacology and Physiology, Saint Louis University School of Medicine St. Louis MO USA.,Department of Pharmaceutical Chemistry, Faculty of Pharmacy, Damanhour University Damanhour Egypt
| | - Lamees Hegazy
- Departments of Pharmacology and Physiology, Saint Louis University School of Medicine St. Louis MO USA
| | - Feng Cao
- John Cochran Division, Department of Veteran's Affairs Medical Center 915 North Grand Blvd. St. Louis MO 63106 USA
| | - Maureen J Donlin
- Edward A. Doisy Department of Biochemistry and Molecular Biology, Saint Louis University School of Medicine St. Louis Missouri USA
| | - Nigam Rath
- Department of Chemistry and Biochemistry, Center for Nanoscience, University of Missouri - St. Louis One University Boulevard St. Louis USA
| | - John Tavis
- Department of Molecular Microbiology and Immunology, The Saint Louis University Liver Center, Saint Louis University School of Medicine St. Louis Missouri USA
| | - Bahaa Elgendy
- Departments of Pharmacology and Physiology, Saint Louis University School of Medicine St. Louis MO USA.,Chemistry Department, Faculty of Science, Benha University Benha 13518 Egypt
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Abdel-Mottaleb M. Excited state intramolecular proton transfer (ESIPT) in the Photoresponsive Prototropic Schiff-Base N′-(2-hydroxybenzylidene)-4-hydroxybenzohydrazide: Computational Modeling Study. J Mol Struct 2017. [DOI: 10.1016/j.molstruc.2017.05.048] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Synthesis, spectroscopic investigations and computational study of monomeric and dimeric structures of 2-methyl-4-quinolinol. RESEARCH ON CHEMICAL INTERMEDIATES 2015. [DOI: 10.1007/s11164-015-2084-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Chew K, Nemchick DJ, Vaccaro PH. Isotopic Dependence of Excited-State Proton-Tunneling Dynamics in Tropolone Probed by Polarization-Resolved Degenerate Four-Wave Mixing Spectroscopy. J Phys Chem A 2013; 117:6126-42. [DOI: 10.1021/jp400160z] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Kathryn Chew
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, United States
| | - Deacon J. Nemchick
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, United States
| | - Patrick H. Vaccaro
- Department of Chemistry, Yale University, P.O. Box 208107, New Haven, Connecticut 06520-8107, United States
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Zborowski KK, Jezierski G, Kim Y, Proniewicz LM. Tautomerism of Neutral α-Tropolone and its Protonated and Deprotonated Forms. Z PHYS CHEM 2013. [DOI: 10.1524/zpch.2013.0351] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
Abstract
Abstract
Possible structures of α-tropolone (2-hydroxy-2,4,6-cycloheptatrien-1-one) tautomers: four neutral, thirteen protonated, and four deprotonated, are studied at the B3LYP/6-311++G∗∗ computational level. The energies and the free energies calculated for the studied tautomers show that for each of the three forms, among all the possible tautomers in the tautomeric mixture, only one structure is expected: a keto-enol structure with an intramolecular hydrogen bond (neutral α-tropolone molecule), the structure with two deprotonated exocyclic oxygen atoms (tropolonate, deprotonated tropolone), and the structure with two hydroxyl group forming an intramolecular hydrogen bond (protonated tropolone). The relative energies of the studied tautomers are rationalized based on the results from the atomic energy integration performed within the frame of the Quantum Theory of Atoms in Molecules.
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Affiliation(s)
| | | | - Younkoyoo Kim
- Hankuk University of Foreign Studies, Department of Chemistry, Republik Korea
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Tadić JM, Xu L. Ab initio and density functional theory study of keto-enol equilibria of deltic acid in gas and aqueous solution phase: a bimolecular proton transfer mechanism. J Org Chem 2012; 77:8621-6. [PMID: 22954314 DOI: 10.1021/jo301575c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Keto-enol tautomerism in deltic acid (2,3-dihydroxycycloprop-2-en-1-one) has been studied using ab initio methods and the B3LYP functional of density functional theory, as well as complete basis set (CBS-QB3 and CBS-APNO) and G4 methods. Relative and absolute energies were calculated with each of the methods, whereas computations of geometries and harmonic frequencies for dihydroxycyclopropenone and hydroxycyclopropanedione were computed in the gas phase but were limited to HF, MP2, and the B3LYP functional, in combination with the 6-31++G(3df,3pd) basis set. Using the MP2/6-31++G(3df,3pd) gas phase optimized structure, each species was then optimized fully in aqueous solution by using the polarizable continuum model (PCM) self-consistent reaction field approach, in which HF, MP2, and B3LYP levels of theory were utilized, with the same 6-31++G(3df,3pd) basis set. In both gas and aqueous solution phases, the keto form is higher in energy for all of the model chemistries considered. From the B3LYP/6-31++G(3df,3pd) Gibbs free energy, the keto-enol tautomeric equilibrium constant for 2,3-dihydroxycycloprop-2-en-1-one/3-hydroxy-1,2-cyclopropanedione is computed to be K(T)(gas) = 2.768 × 10(-12) and K(T)(aq) = 5.469 × 10(-14). It is concluded that the enol form is overwhelmingly predominant in both environments.
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Affiliation(s)
- Jovan M Tadić
- NASA Ames Research Center, Moffett Field, California 94035, United States.
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Kumar AS, Rao PVA, Nagarajan R. Synthesis of pyrido[2,3-b]indoles and pyrimidoindoles via Pd-catalyzed amidation and cyclization. Org Biomol Chem 2012; 10:5084-93. [PMID: 22622595 DOI: 10.1039/c2ob25371b] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Biologically and pharmaceutically active core structures containing a new class of 4-hydroxy-α-carbolines, dihydropyrido[2,3-b]indoles, pyrimido[4,5-b] and [5,4-b]indoles have been synthesized in good yields via Pd-catalyzed amidation and cyclizations. The keto-enol tautomerism in 4-hydroxy-α-carbolines has been investigated by DFT calculations and spectroscopic techniques. The fluorescence studies of pyrimido[4,5-b] and [5,4-b]indoles were carried out with good quantum yields.
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Tanak H. Crystal Structure, Spectroscopy, and Quantum Chemical Studies of (E)-2-[(2-Chlorophenyl)iminomethyl]-4-trifluoromethoxyphenol. J Phys Chem A 2011; 115:13865-76. [DOI: 10.1021/jp205788b] [Citation(s) in RCA: 69] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Hasan Tanak
- Department of Physics, Faculty of Arts and Sciences, Amasya University, 05100 Amasya, Turkey
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Murdock D, Burns LA, Vaccaro PH. Vibrational specificity of proton-transfer dynamics in ground-state tropolone. Phys Chem Chem Phys 2010; 12:8285-99. [DOI: 10.1039/c003140b] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Kassaee M, Cheshmehkani A, Musavi S, Majdi M, Motamedi E. 1H-Phosphepine-benzene phosphine valence tautomerizations: Impacts of substituents at ab initio and DFT levels. ACTA ACUST UNITED AC 2008. [DOI: 10.1016/j.theochem.2008.06.025] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Sanz P, Mó O, Yáñez M, Elguero J. Bonding in tropolone, 2-aminotropone, and aminotroponimine: no evidence of resonance-assisted hydrogen-bond effects. Chemistry 2008; 14:4225-32. [PMID: 18381721 DOI: 10.1002/chem.200701827] [Citation(s) in RCA: 75] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Abstract
The properties of the intramolecular hydrogen bond (IMHB) in tropolone, aminotropone, and aminotroponimine have been compared with those in the corresponding saturated analogues at the B3LYP/6-311+G(3df,2p)//B3LYP/6-311+G(d,p) level of theory. In general, all those compounds in which the seven-membered ring is unsaturated exhibit a stronger IMHB than their saturated counterparts. Nevertheless, this enhanced strength is not primarily due to resonance-assisted hydrogen-bond effects, but to the much higher intrinsic basicity and acidity of the hydrogen-bond acceptor and donor groups, respectively, in the unsaturated compounds. These acidity and basicity enhancements have a double origin: 1) the unsaturated nature of the moiety to which the hydrogen-bond donor and acceptor are attached and 2) the cyclic nature of the compounds under scrutiny. As has been found for hydroxymethylene and aminomethylene cyclobutanones, and cyclobutenones and their nitrogen-containing analogues, the IMHB strength follows the [donor, acceptor] trend: [OH, C=NH]>[OH, C=O]>[NH(2), C=NH]>[NH(2), C=O] and fulfills a Steiner-Limbach correlation similar to that followed by intermolecular hydrogen bonds.
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Affiliation(s)
- Pablo Sanz
- Departamento de Química, C-9, Universidad Autónoma de Madrid, Cantoblanco, 28049 Madrid, Spain
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