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Separation of rotamers of 5-nitrosopyrimidines and estimation of binding constants of their complexes with β-cyclodextrin by capillary electrophoresis. J Chromatogr A 2018; 1570:164-171. [DOI: 10.1016/j.chroma.2018.07.083] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2018] [Revised: 07/25/2018] [Accepted: 07/29/2018] [Indexed: 12/12/2022]
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2
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Procházková E, Čechová L, Kind J, Janeba Z, Thiele CM, Dračínský M. Photoswitchable Intramolecular Hydrogen Bonds in 5-Phenylazopyrimidines Revealed By In Situ Irradiation NMR Spectroscopy. Chemistry 2017; 24:492-498. [DOI: 10.1002/chem.201705146] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/30/2017] [Indexed: 12/16/2022]
Affiliation(s)
- Eliška Procházková
- Institute of Organic Chemistry and Biochemistry; Czech Academy of Sciences; Flemingovo nám. 2 16610 Prague 6 Czech Republic
| | - Lucie Čechová
- Institute of Organic Chemistry and Biochemistry; Czech Academy of Sciences; Flemingovo nám. 2 16610 Prague 6 Czech Republic
| | - Jonas Kind
- Clemens-Schöpf Institut für Organische Chemie und Biochemie; Technische Universität Darmstadt; Alarich-Weiss Strasse 16 64287 Darmstadt Germany
| | - Zlatko Janeba
- Institute of Organic Chemistry and Biochemistry; Czech Academy of Sciences; Flemingovo nám. 2 16610 Prague 6 Czech Republic
| | - Christina M. Thiele
- Clemens-Schöpf Institut für Organische Chemie und Biochemie; Technische Universität Darmstadt; Alarich-Weiss Strasse 16 64287 Darmstadt Germany
| | - Martin Dračínský
- Institute of Organic Chemistry and Biochemistry; Czech Academy of Sciences; Flemingovo nám. 2 16610 Prague 6 Czech Republic
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3
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Bártová K, Čechová L, Procházková E, Socha O, Janeba Z, Dračínský M. Influence of Intramolecular Charge Transfer and Nuclear Quantum Effects on Intramolecular Hydrogen Bonds in Azopyrimidines. J Org Chem 2017; 82:10350-10359. [PMID: 28829606 DOI: 10.1021/acs.joc.7b01810] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Intramolecular hydrogen bonds (IMHBs) in 5-azopyrimidines are investigated by NMR spectroscopy and DFT computations that involve nuclear quantum effects. A series of substituted 5-phenylazopyrimidines with one or two hydrogen bond donors able to form IMHBs with the azo group is prepared by azo coupling. The barrier of interconversion between two rotamers of the compounds with two possible IMHBs is determined by variable temperature NMR spectroscopy and it is demonstrated that the barrier is significantly affected by intramolecular charge transfer. Through-hydrogen-bond scalar coupling is investigated in 15N labeled compounds and the stability of the IMHBs is correlated with experimental NMR parameters and rationalized by path integral molecular dynamics simulations that involve nuclear quantum effects. Detailed information on the hydrogen bond geometry upon hydrogen-to-deuterium isotope exchange is obtained from a comparison of experimental and calculated NMR data.
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Affiliation(s)
- Kateřina Bártová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic , Flemingovo nam. 2, 166 10 Prague, Czech Republic.,Faculty of Science, Charles University , 116 36 Prague, Czech Republic
| | - Lucie Čechová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic , Flemingovo nam. 2, 166 10 Prague, Czech Republic.,Department of Chemistry of Natural Compounds, University of Chemistry and Technology Prague , Technická 5, 166 28 Prague, Czech Republic
| | - Eliška Procházková
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic , Flemingovo nam. 2, 166 10 Prague, Czech Republic
| | - Ondřej Socha
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic , Flemingovo nam. 2, 166 10 Prague, Czech Republic
| | - Zlatko Janeba
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic , Flemingovo nam. 2, 166 10 Prague, Czech Republic
| | - Martin Dračínský
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of the Czech Republic , Flemingovo nam. 2, 166 10 Prague, Czech Republic
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4
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Dračínský M, Čechová L, Hodgkinson P, Procházková E, Janeba Z. Resonance-assisted stabilisation of hydrogen bonds probed by NMR spectroscopy and path integral molecular dynamics. Chem Commun (Camb) 2016; 51:13986-9. [PMID: 26245988 DOI: 10.1039/c5cc05199a] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Path integral molecular dynamics and experimental NMR data are used to investigate resonance-assisted hydrogen bonds (RAHBs). When nuclear delocalisation is included in chemical shift calculations, the agreement with experiment is excellent, while static calculations show very poor performance. The results support the concept of RAHB, which has recently been questioned.
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Affiliation(s)
- M Dračínský
- Institute of Organic Chemistry and Biochemistry, AS CR, Flemingovo nám. 2, 166 10 Prague, Czech Republic.
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5
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Procházková E, Čechová L, Tarábek J, Janeba Z, Dračínský M. Tunable Push–Pull Interactions in 5-Nitrosopyrimidines. J Org Chem 2016; 81:3780-9. [DOI: 10.1021/acs.joc.6b00446] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Eliška Procházková
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of
the Czech Republic, Flemingovo
nam. 2, 166 10, Prague, Czech Republic
| | - Lucie Čechová
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of
the Czech Republic, Flemingovo
nam. 2, 166 10, Prague, Czech Republic
| | - Ján Tarábek
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of
the Czech Republic, Flemingovo
nam. 2, 166 10, Prague, Czech Republic
| | - Zlatko Janeba
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of
the Czech Republic, Flemingovo
nam. 2, 166 10, Prague, Czech Republic
| | - Martin Dračínský
- Institute of Organic Chemistry and Biochemistry, Academy of Sciences of
the Czech Republic, Flemingovo
nam. 2, 166 10, Prague, Czech Republic
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6
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Al-Ansari IAZ. Effects of Structure and Environment on the Spectroscopic Properties of (3-Amino-Substituted-Thieno[2,3-b] Pyridine-2-yl)Pyridine/Quinolin-2-yl)(Phenyl)Methanones: Experimental and Theoretical Study. J Fluoresc 2016; 26:821-34. [PMID: 26856341 DOI: 10.1007/s10895-016-1770-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2015] [Accepted: 01/14/2016] [Indexed: 10/22/2022]
Abstract
The electronic absorption, excitation and fluorescence properties of two 3-amino-substituted-thieno[2,3-b]pyridine/quinolin-2-yl)(phenyl)methanones; (referred to as compounds 1-2: where 3-amino-4,5,6-trimethyl-thieno[2,3-b]pyridin-2-yl)(phenyl)methanone (1); and 3-amino-5,6,7,8-tetrahydro-thieno[2,3-b]quinolin-2-yl)(phenyl)methanone (2)) have been investigated in solvents of various polarity and hydrogen-bonding abilities. Results based on the electronic absorption, excitation and emission study of these compounds; indicated that singlets (S1 and S2) excited-states are populated in non-polar and polar protic/aprotic solvents giving dual fluorescence with weak charge transfer separation. The experimental results were interpreted with the aid of quantum chemistry calculations carried out with the DFT and TD-DFT/B3lyp/6-31 + G(d,p) methods. Based on these calculations, compounds 1-2 exist in two rotamers: anti and syn, separated by ca. 5-6 kcal mol(-1) energy barriers in favor of the anti-conformer. The anti-structure, was shown to be stabilized through existence of intramolecular NH…O hydrogen bond (H-b), which plays a dominant role in affecting the energy of the HOMO-1 molecular orbital. Further, methyl/alkyl substitution in the pyridyl-thiophene ring was shown to involve in σ-π hyper-conjugation and destabilization of the HOMO-1 MO's.
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Affiliation(s)
- Ibrahim Ahmed Z Al-Ansari
- Department of Chemistry & Earth Sciences, College of Arts & Sciences, Qatar University, P.O. Box: 2713, Doha, Qatar.
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7
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Affiliation(s)
- Daniel Beaudoin
- Département de Chimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada
| | - James D. Wuest
- Département de Chimie, Université de Montréal, Montréal, Québec H3C 3J7, Canada
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8
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Pontiki E, Hadjipavlou-Litina D, Patsilinakos A, Tran TM, Marson CM. Pteridine-2,4-diamine derivatives as radical scavengers and inhibitors of lipoxygenase that can possess anti-inflammatory properties. Future Med Chem 2015; 7:1937-51. [PMID: 26423719 PMCID: PMC5462101 DOI: 10.4155/fmc.15.104] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023] Open
Abstract
BACKGROUND Reactive oxygen species are associated with inflammation implicated in cancer, atherosclerosis and autoimmune diseases. The complex nature of inflammation and of oxidative stress suggests that dual-target agents may be effective in combating diseases involving reactive oxygen species. RESULTS A novel series of N-substituted 2,4-diaminopteridines has been synthesized and evaluated as antioxidants in several assays. Many exhibited potent lipid antioxidant properties, and some are inhibitors of soybean lipoxygenase, IC50 values extending down to 100 nM for both targets. Several pteridine derivatives showed efficacy at 0.01 mmol/kg with little tissue damage in a rat model of colitis. 2-(4-methylpiperazin-1-yl)-N-(thiophen-2-ylmethyl)pteridin-4-amine (18f) at 0.01 mmol/kg exhibited potent anti-inflammatory activity (reduction by 41%). CONCLUSION The 2,4-diaminopteridine core represents a new scaffold for lipoxygenase inhibition as well as sustaining anti-inflammatory properties.
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Affiliation(s)
- Eleni Pontiki
- Christopher Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London WC1H OAJ, UK
- Department of Pharmaceutical Chemistry, Faculty of Health Sciences, School of Pharmacy, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece
| | - Dimitra Hadjipavlou-Litina
- Department of Pharmaceutical Chemistry, Faculty of Health Sciences, School of Pharmacy, Aristotle University of Thessaloniki, Thessaloniki, 54124, Greece
| | - Alexandros Patsilinakos
- Rome Center for Molecular Design, Dipartimento di Chimica e Tecnologie del Farmaco, Sapienza University of Rome, 00185 Rome, Italy
| | - Trang M Tran
- Christopher Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London WC1H OAJ, UK
| | - Charles M Marson
- Christopher Ingold Laboratories, Department of Chemistry, University College London, 20 Gordon Street, London WC1H OAJ, UK
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9
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Olivella M, Marchal A, Nogueras M, Melguizo M, Lima B, Tapia A, Feresin GE, Parravicini O, Giannini F, Andujar SA, Cobo J, Enriz RD. A New Series of Antibacterial Nitrosopyrimidines: Synthesis and Structure-Activity Relationship. Arch Pharm (Weinheim) 2014; 348:68-80. [DOI: 10.1002/ardp.201400271] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/07/2014] [Revised: 09/02/2014] [Accepted: 10/01/2014] [Indexed: 11/09/2022]
Affiliation(s)
- Monica Olivella
- Facultad de Química; Bioquímica y Farmacia; Universidad Nacional de San Luis; San Luis Argentina
| | - Antonio Marchal
- Departamento de Química Inorgánica y Orgánica; Universidad de Jaén; Jaén Spain
| | - Manuel Nogueras
- Departamento de Química Inorgánica y Orgánica; Universidad de Jaén; Jaén Spain
| | - Manuel Melguizo
- Departamento de Química Inorgánica y Orgánica; Universidad de Jaén; Jaén Spain
| | - Beatriz Lima
- Facultad de Ingeniería, Instituto de Biotecnología; Universidad Nacional de San Juan; San Juan Argentina
| | - Alejandro Tapia
- Facultad de Ingeniería, Instituto de Biotecnología; Universidad Nacional de San Juan; San Juan Argentina
| | - Gabriela E. Feresin
- Facultad de Ingeniería, Instituto de Biotecnología; Universidad Nacional de San Juan; San Juan Argentina
| | - Oscar Parravicini
- Facultad de Bioquímica Química y Farmacia, Instituto de Química Orgánica; Universidad Nacional de Tucumán; S. M. de Tucumán Argentina
| | - Fernando Giannini
- Facultad de Química; Bioquímica y Farmacia; Universidad Nacional de San Luis; San Luis Argentina
| | - Sebastián A. Andujar
- Facultad de Química; Bioquímica y Farmacia; Universidad Nacional de San Luis; San Luis Argentina
- IMIBIO-SL (CONICET); San Luis Argentina
| | - Justo Cobo
- Departamento de Química Inorgánica y Orgánica; Universidad de Jaén; Jaén Spain
| | - Ricardo D. Enriz
- Facultad de Química; Bioquímica y Farmacia; Universidad Nacional de San Luis; San Luis Argentina
- IMIBIO-SL (CONICET); San Luis Argentina
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Charaf-Eddin A, Cauchy T, Felpin FX, Jacquemin D. Vibronic spectra of organic electronic chromophores. RSC Adv 2014. [DOI: 10.1039/c4ra10731d] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022] Open
Abstract
Vibronic effects in organic electronic building blocks are presented.
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Affiliation(s)
- Azzam Charaf-Eddin
- Chimie Et Interdisciplinarité
- Synthèse, Analyse, Modélisation (CEISAM)
- UMR CNRS no. 6230
- Université de Nantes
- 44322 Nantes, Cedex 3, France
| | - Thomas Cauchy
- Laboratoire MOLTECH-Anjou – UMR CNRS 6200
- Université d’Angers
- 49045 Angers, France
| | - François-Xavier Felpin
- Chimie Et Interdisciplinarité
- Synthèse, Analyse, Modélisation (CEISAM)
- UMR CNRS no. 6230
- Université de Nantes
- 44322 Nantes, Cedex 3, France
| | - Denis Jacquemin
- Chimie Et Interdisciplinarité
- Synthèse, Analyse, Modélisation (CEISAM)
- UMR CNRS no. 6230
- Université de Nantes
- 44322 Nantes, Cedex 3, France
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11
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Čechová L, Procházková E, Císařová I, Dračínský M, Janeba Z. Separation of planar rotamers through intramolecular hydrogen bonding in polysubstituted 5-nitrosopyrimidines. Chem Commun (Camb) 2014; 50:14892-5. [DOI: 10.1039/c4cc06978a] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Unique isolation of pairs of planar rotamers, planamers, as chemical species differing only in nitroso group orientation, separable through the presence of a single intramolecular hydrogen bond, is reported.
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Affiliation(s)
- L. Čechová
- Institute of Organic Chemistry and Biochemistry
- Academy of Sciences of the Czech Republic
- CZ-166 10 Prague 6, Czech Republic
- Department of Chemistry of Natural Compounds
- Institute of Chemical Technology Prague
| | - E. Procházková
- Institute of Organic Chemistry and Biochemistry
- Academy of Sciences of the Czech Republic
- CZ-166 10 Prague 6, Czech Republic
- Faculty of Science
- Charles University in Prague
| | - I. Císařová
- Faculty of Science
- Charles University in Prague
- CZ-128 40 Prague 2, Czech Republic
| | - M. Dračínský
- Institute of Organic Chemistry and Biochemistry
- Academy of Sciences of the Czech Republic
- CZ-166 10 Prague 6, Czech Republic
| | - Z. Janeba
- Institute of Organic Chemistry and Biochemistry
- Academy of Sciences of the Czech Republic
- CZ-166 10 Prague 6, Czech Republic
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