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Kondrashova SA, Polyancev FM, Latypov SK. Tautomeric preference in lumazines, deazalumazines, isoalloxazines and pyrimidines and its effect on the reactivity of alkyl groups. Bioorg Chem 2021; 109:104725. [PMID: 33611139 DOI: 10.1016/j.bioorg.2021.104725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2020] [Revised: 02/02/2021] [Accepted: 02/03/2021] [Indexed: 11/30/2022]
Abstract
In lumazines, deazalumazines and pyrimidines, there are extremely low-energy "rare" tautomers (<2.3 kcal/mol), this fact perfectly explains the observed mobility of usually "non-labile" protons of methyl groups in such systems. In general, the dependence of tautomeric preference on structure correlates well with experimental findings. Thus, the activity of alkyl groups during biological transformations may be due to the presence of the corresponding thermodynamically stable tautomers.
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Affiliation(s)
- Svetlana A Kondrashova
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Russia
| | - Fedor M Polyancev
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Russia
| | - Shamil K Latypov
- Arbuzov Institute of Organic and Physical Chemistry, FRC Kazan Scientific Center of RAS, Russia.
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Tautomerism of Guanine Analogues. Biomolecules 2020; 10:biom10020170. [PMID: 31979043 PMCID: PMC7072560 DOI: 10.3390/biom10020170] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/06/2020] [Revised: 01/17/2020] [Accepted: 01/19/2020] [Indexed: 01/18/2023] Open
Abstract
Tautomerism of nucleic acid (NA) bases is a crucial factor for the maintenance and translation of genetic information in organisms. Only canonical tautomers of NA bases can form hydrogen-bonded complexes with their natural counterparts. On the other hand, rare tautomers of nucleobases have been proposed to be involved in processes catalysed by NA enzymes. Isocytosine, which can be considered as a structural fragment of guanine, is known to have two stable tautomers both in solution and solid states. The tautomer equilibrium of isocytosine contrasts with the remarkable stability of the canonical tautomer of guanine. This paper investigates the factors contributing to the stability of the canonical tautomer of guanine by a combination of NMR experiments and theoretical calculations. The electronic effects of substituents on the stability of the rare tautomers of isocytosine and guanine derivatives are studied by density functional theory (DFT) calculations. Selected derivatives are studied by variable-temperature NMR spectroscopy. Rare tautomers can be stabilised in solution by intermolecular hydrogen-bonding interactions with suitable partners. These intermolecular interactions give rise to characteristic signals in proton NMR spectra, which make it possible to undoubtedly confirm the presence of a rare tautomer.
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Pohl R, Socha O, Šála M, Rejman D, Dračínský M. The Control of the Tautomeric Equilibrium of Isocytosine by Intermolecular Interactions. European J Org Chem 2018. [DOI: 10.1002/ejoc.201800506] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Radek Pohl
- Institute of Organic Chemistry and Biochemistry; Czech Academy of Sciences; Flemingovo nám. 2 166 10 Prague Czech Republic
| | - Ondřej Socha
- Institute of Organic Chemistry and Biochemistry; Czech Academy of Sciences; Flemingovo nám. 2 166 10 Prague Czech Republic
| | - Michal Šála
- Institute of Organic Chemistry and Biochemistry; Czech Academy of Sciences; Flemingovo nám. 2 166 10 Prague Czech Republic
| | - Dominik Rejman
- Institute of Organic Chemistry and Biochemistry; Czech Academy of Sciences; Flemingovo nám. 2 166 10 Prague Czech Republic
| | - Martin Dračínský
- Institute of Organic Chemistry and Biochemistry; Czech Academy of Sciences; Flemingovo nám. 2 166 10 Prague Czech Republic
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Latypov SK, Kondrashova SA, Galyametdinova IV, Semenov VE, Reznik VS. Hydrogen's isotopic exchange reaction in the C-methyl sides in the medicinal agent xymedon: NMR spectroscopy and ab initio calculations. J PHYS ORG CHEM 2018. [DOI: 10.1002/poc.3804] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Shamil K. Latypov
- A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center; Russian Academy of Sciences; Kazan Russian Federation
| | - Svetlana A. Kondrashova
- A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center; Russian Academy of Sciences; Kazan Russian Federation
- Kazan Federal University; Kazan Russian Federation
| | - Irina V. Galyametdinova
- A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center; Russian Academy of Sciences; Kazan Russian Federation
| | - Vyacheslav E. Semenov
- A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center; Russian Academy of Sciences; Kazan Russian Federation
| | - Vladimir S. Reznik
- A.E. Arbuzov Institute of Organic and Physical Chemistry, Kazan Scientific Center; Russian Academy of Sciences; Kazan Russian Federation
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Rajic Z, Tovmasyan A, de Santana OL, Peixoto IN, Spasojevic I, do Monte SA, Ventura E, Rebouças JS, Batinic-Haberle I. Challenges encountered during development of Mn porphyrin-based, potent redox-active drug and superoxide dismutase mimic, MnTnBuOE-2-PyP 5+, and its alkoxyalkyl analogues. J Inorg Biochem 2017; 169:50-60. [PMID: 28131001 DOI: 10.1016/j.jinorgbio.2017.01.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2016] [Revised: 12/21/2016] [Accepted: 01/03/2017] [Indexed: 11/28/2022]
Abstract
We disclose here the studies that preceded and guided the preparation of the metal-based, redox-active therapeutic Mn(III) meso-tetrakis(N-n-butoxyethylpyridyl)porphyrin, MnTnBuOE-2-PyP5+ (BMX-001), which is currently in Phase I/II Clinical Trials at Duke University (USA) as a radioprotector of normal tissues in cancer patients. N-substituted pyridylporphyrins are ligands for Mn(III) complexes that are among the most potent superoxide dismutase mimics thus far synthesized. To advance their design, thereby improving their physical and chemical properties and bioavailability/toxicity profiles, we undertook a systematic study on placing oxygen atoms into N-alkylpyridyl chains via alkoxyalkylation reaction. For the first time we show here the unforeseen structural rearrangement that happens during the alkoxyalkylation reaction by the corresponding tosylates. Comprehensive experimental and computational approaches were employed to solve the rearrangement mechanism involved in quaternization of pyridyl nitrogens, which, instead of a single product, led to a variety of mixed N-alkoxyalkylated and N-alkylated pyridylporphyrins. The rearrangement mechanism involves the formation of an intermediate alkyl oxonium cation in a chain-length-dependent manner, which subsequently drives differential kinetics and thermodynamics of competing N-alkoxyalkylation versus in situ N-alkylation. The use of alkoxyalkyl tosylates, of different length of alkyl fragments adjacent to oxygen atom, allowed us to identify the set of alkyl fragments that would result in the synthesis of a single compound of high purity and excellent therapeutic potential.
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Affiliation(s)
- Zrinka Rajic
- Department of Radiation Oncology, Duke University Medical Center, Durham, NC 27710, USA
| | - Artak Tovmasyan
- Department of Radiation Oncology, Duke University Medical Center, Durham, NC 27710, USA
| | - Otávio L de Santana
- Departamento de Química, CCEN, Universidade Federal da Paraiba, João Pessoa, PB 58051-900, Brazil
| | - Isabelle N Peixoto
- Departamento de Química, CCEN, Universidade Federal da Paraiba, João Pessoa, PB 58051-900, Brazil
| | - Ivan Spasojevic
- Department of Medicine, Duke University Medical Center, Durham, NC 27710, USA; Duke Cancer Institute, Pharmaceutical Research Shared Resource, PK/PD Core Laboratory, Durham, NC 27710, United States
| | - Silmar A do Monte
- Departamento de Química, CCEN, Universidade Federal da Paraiba, João Pessoa, PB 58051-900, Brazil
| | - Elizete Ventura
- Departamento de Química, CCEN, Universidade Federal da Paraiba, João Pessoa, PB 58051-900, Brazil
| | - Júlio S Rebouças
- Departamento de Química, CCEN, Universidade Federal da Paraiba, João Pessoa, PB 58051-900, Brazil.
| | - Ines Batinic-Haberle
- Department of Radiation Oncology, Duke University Medical Center, Durham, NC 27710, USA.
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Mohammadi M, Ramazani S. Theoretical kinetics study of thymine tautomerism and interaction of Na+ with its tautomers. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1232845] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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Fehér C, Habuš I, Wouters J, Skoda-Földes R. Synthesis of ferrocene-labelled 2-aminopyrimidine derivatives via homogeneous catalytic carbonylation. MONATSHEFTE FUR CHEMIE 2014. [DOI: 10.1007/s00706-014-1299-1] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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Galvão TLP, Ribeiro da Silva MDMC, Ribeiro da Silva MAV. From 2,4-Dimethoxypyrimidine to 1,3-Dimethyluracil: Isomerization and Hydrogenation Enthalpies and Noncovalent Interactions. J Phys Chem A 2014; 118:4816-23. [DOI: 10.1021/jp503412u] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023]
Affiliation(s)
- Tiago L. P. Galvão
- Centro de Investigação
em Química, Department of Chemistry and Biochemistry, Faculty
of Science, University of Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal
| | - Maria D. M. C. Ribeiro da Silva
- Centro de Investigação
em Química, Department of Chemistry and Biochemistry, Faculty
of Science, University of Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal
| | - Manuel A. V. Ribeiro da Silva
- Centro de Investigação
em Química, Department of Chemistry and Biochemistry, Faculty
of Science, University of Porto, Rua do Campo Alegre, 687, P-4169-007 Porto, Portugal
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