1
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Meshalkin SA, Tsybulin SV, Bardakov VG, Tatarinov IA, Shitov DA, Tupikina EY, Efremova MM, Antonov AS. "Buttressing Effect" in the Halogen-Lithium Exchange in ortho-Bromo-N,N-dimethylanilines and Related Naphthalenes. Chemistry 2024; 30:e202303956. [PMID: 38131216 DOI: 10.1002/chem.202303956] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/28/2023] [Revised: 12/21/2023] [Accepted: 12/22/2023] [Indexed: 12/23/2023]
Abstract
Non-covalent interactions such as coordination of an organolithium reagent by a directing group and steric repulsion of substituents strongly affect the halogen-lithium exchange process. Here we present the manifestation of the "buttressing effect" - an indirect interaction between two substituents issued by the presence of a third group - and its influence on the ease and selectivity of the bromine-lithium exchange and the reactivity of formed aryllithiums. The increase of the size of the "buttressing" substituent strongly affects the conformation of a NMe2 group, forcing it to hinder ortho-bromine and thus slowing down the exchange. In naphthalene substrates bearing two bromines, this suppresses regioselectivity of the reaction. The "buttressing effect" forces formed aryllithiums to deaggregate, thus boosting their reactivity. This facilitates the decomposition via protolisys by ethereal solvents even at low temperatures and in some cases initiates fast Wurtz-Fittig coupling.
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Affiliation(s)
- Stepan A Meshalkin
- Institute of Chemistry, St. Petersburg State University, 198504, St. Petersburg, Russian Federation
| | - Semyon V Tsybulin
- Institute of Chemistry, St. Petersburg State University, 198504, St. Petersburg, Russian Federation
| | - Victor G Bardakov
- Institute of Chemistry, St. Petersburg State University, 198504, St. Petersburg, Russian Federation
| | - Ilya A Tatarinov
- Institute of Chemistry, St. Petersburg State University, 198504, St. Petersburg, Russian Federation
| | - Daniil A Shitov
- Institute of Chemistry, St. Petersburg State University, 198504, St. Petersburg, Russian Federation
| | - Elena Y Tupikina
- Institute of Chemistry, St. Petersburg State University, 198504, St. Petersburg, Russian Federation
| | - Mariia M Efremova
- Institute of Chemistry, St. Petersburg State University, 198504, St. Petersburg, Russian Federation
| | - Alexander S Antonov
- Institute of Organic Chemistry, University of Regensburg, D-93053, Regensburg, Germany
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2
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Tsybulin SV, Kaplanskiy MV, Antonov AS. Transition-Metal-Free Synthesis of 2-Substituted Benzo[cd]Indoles via the Reaction of 1-Halo-8-lithionaphthalenes with Nitriles. Chemistry 2024; 30:e202303768. [PMID: 38197193 DOI: 10.1002/chem.202303768] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/13/2023] [Revised: 01/09/2024] [Accepted: 01/10/2024] [Indexed: 01/11/2024]
Abstract
A simple and effective organolithium approach to the synthesis of 2-substituted benzo[cd]indoles from peri-dihalonaphthalenes and nitriles has been developed. The reaction proceeds via a surprisingly easy intramolecular aromatic nucleophilic substitution facilitated by the "clothespin effect". The discovered transformation provides good isolated yields, allows usage of an extensive range of nitriles, and demonstrates a good substituents tolerance. UV-absorption and NMR spectra of the obtained benzo[cd]indoles and their protonated forms demonstrated exclusive protonation to the indole nitrogen atom even in the presence of two NMe2 groups in positions 5 and 6 (i. e. "proton sponge" moiety).
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Affiliation(s)
- Semyon V Tsybulin
- St. Petersburg State University, 198504, St. Petersburg, Russian Federation
| | - Mark V Kaplanskiy
- St. Petersburg State University, 198504, St. Petersburg, Russian Federation
| | - Alexander S Antonov
- Institute of Organic Chemistry, University of Regensburg, D-93053, Regensburg, Germany
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3
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Kaplanskiy MV, Karpov VV, Tupikina EY, Antonov AS. NMR detection of the strained metallacycles in organolithiums: theoretical study. Org Biomol Chem 2024; 22:982-989. [PMID: 38180388 DOI: 10.1039/d3ob01916k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2024]
Abstract
For the first time through quantum chemistry methods, the effective use of 1JCLi spin-spin coupling constants as descriptors for assessing the formation of strained metallacycles is demonstrated. Both acyclic organolithiums and 3- to 7-membered metallacycles are examined. 80 organolithium compounds, including both monomeric and dimeric species, with ligands containing fluorine, nitrogen, oxygen, and carbon (in the form of carbanions), are tested. In general, the 1JCLi values below 12 Hz for monomeric species and below 6 Hz for dimeric species serve as clear indicators of strained monomeric metallacycle formation (for 6Li nuclei). The primary contributor to the overall 1JCLi value is the Fermi-contact term, which correlates directly with the carbon-lithium interatomic distance and allows to distinguish between dimers and monomers.
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Affiliation(s)
- Mark V Kaplanskiy
- Institute of Chemistry, St Petersburg State University, 198504 St Petersburg, Russian Federation.
| | - Valerii V Karpov
- Institute of Chemistry, St Petersburg State University, 198504 St Petersburg, Russian Federation.
| | - Elena Yu Tupikina
- Institute of Chemistry, St Petersburg State University, 198504 St Petersburg, Russian Federation.
| | - Alexander S Antonov
- Institute of Organic Chemistry, University of Regensburg, D-93053 Regensburg, Germany.
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Yakubenko AA, Tupikina EY, Antonov AS. The Role of Conjugation in the Halogen-Lithium Exchange Selectivity: Lithiation of 4,6,7,9-Tetrabromo-1,3-dimethyl-2,3-dihydro-1H-perimidine. Chemistry 2023; 29:e202301439. [PMID: 37261949 DOI: 10.1002/chem.202301439] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 05/31/2023] [Accepted: 06/01/2023] [Indexed: 06/03/2023]
Abstract
The first case of successful suppression of the coordination of a lithium atom with a dialkylamino group by the effective conjugation of the latter with the aromatic core has been discovered. This effect controls regioselectivity of the bromine-lithium exchange in 4,6,7,9-tetrabromo-1,3-dimethyl-2,3-dihydro-1H-perimidine, which leads to products with the most effective conjugation. As a result, the product of this quadruple exchange demonstrates no tendency of the coordination of the NMe groups to neighboring lithium atoms despite the absence of steric restrictions. Experimental results are explained by means of quantum chemical calculations: geometry optimization, natural bond analysis and scans using the modredundant scheme.
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Affiliation(s)
- Artyom A Yakubenko
- Institute of Chemistry, St. Petersburg State University, 198504, St. Petersburg, Russian Federation
| | - Elena Yu Tupikina
- Institute of Chemistry, St. Petersburg State University, 198504, St. Petersburg, Russian Federation
| | - Alexander S Antonov
- Institute of Organic Chemistry, University of Regensburg, D-93053, Regensburg, Germany
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Tolochenko DO, Tsybulin SV, Yakubenko AA, Tupikina EY, Antonov AS. Spontaneous Cyclization of peri-Diiminonaphthalenes Leading to the Formation of Benzo[ de]isoquinolines and Stable Benzo[ de]isoquinoliniums. Org Lett 2023; 25:977-981. [PMID: 36748976 DOI: 10.1021/acs.orglett.3c00035] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/08/2023]
Abstract
The interaction of peri-dilithionaphthalenes with organic cyanides was studied. Instead of the expected peri-diimines, the reaction leads to the formation of three types of benzo[de]isoquinolines. Treatment of unsubstituted 1,8-dilithionaphthalene with aromatic nitriles results in the formation of 1-amino-1,3-diaryl-1H-benzo[de]isoquinolines. In contrast, 4,5-dilithio-1,8-bis(dimethylamino)naphthalene gives an aromatic isoquinolonium cation via elimination of ammonia under the same condition. Upon treatment with tert-butylcyanide, both dilithionaphthalenes undergo a transformation to 1-amino-3,4-di-tert-butyl-4H-benzo[de]isoquinolines. The observed reactivity was supported by quantum chemical calculations.
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Affiliation(s)
- Dmitrii O Tolochenko
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Semyon V Tsybulin
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Artyom A Yakubenko
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Elena Yu Tupikina
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Alexander S Antonov
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
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Marchenko AV, Ozeryanskii VA, Demidov OP, Antonov AS, Tupikina EY, Pozharskii AF. Organometallic Synthesis of 2,3,6,7-Tetrasubstituted 1,8-Bis(dimethylamino)naphthalenes for Investigation of the Double Buttressing Effect in Proton Sponges. J Org Chem 2022; 87:16506-16516. [DOI: 10.1021/acs.joc.2c02212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Andrey V. Marchenko
- Department of Chemistry, Southern Federal University, Zorge strasse 7, 344090 Rostov-on-Don, Russian Federation
| | - Valery A. Ozeryanskii
- Department of Chemistry, Southern Federal University, Zorge strasse 7, 344090 Rostov-on-Don, Russian Federation
| | - Oleg P. Demidov
- Department of Chemistry and Pharmacy, North Caucasus Federal University, 1a Pushkin St., 355017 Stavropol, Russian Federation
| | - Alexander S. Antonov
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Elena Yu. Tupikina
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Alexander F. Pozharskii
- Department of Chemistry, Southern Federal University, Zorge strasse 7, 344090 Rostov-on-Don, Russian Federation
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Karpov VV, Antonov AS, Tupikina EY. Choice of computational protocol for carbon-lithium spin-spin coupling constants 1 J CLi. Magn Reson Chem 2022; 60:985-995. [PMID: 35881390 DOI: 10.1002/mrc.5299] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/29/2022] [Revised: 07/19/2022] [Accepted: 07/21/2022] [Indexed: 06/15/2023]
Abstract
In this work, we tested various computational schemes for calculations of 1 JCLi constants with a high accuracy. On the example of six organolithium reagents (phenyllithium monomer and dimer, monomer s-butyllithium, monomers of 1- and 2-lithionaphthalenes, and a methyllithium tetramer), the following aspects are discussed: (i) the role of a model system geometry, (ii) influence of solvent effects, and (iii) the choice of a functional and basis set. Practical recommendations for calculation of 1 JCLi with an accuracy ±2 Hz are formulated.
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Affiliation(s)
- Valerii V Karpov
- Institute of Chemistry, St. Petersburg State University, St. Petersburg, Russia
| | - Alexander S Antonov
- Institute of Chemistry, St. Petersburg State University, St. Petersburg, Russia
| | - Elena Yu Tupikina
- Institute of Chemistry, St. Petersburg State University, St. Petersburg, Russia
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Mikshiev VY, Tolstoy PM, Puzyk AM, Kirichenko SO, Antonov AS. peri-Interactions in 1,8-bis(dimethylamino)naphthalene ortho-ketimine cations facilitate [1,5]-hydride shift: selective synthesis of 1,2,3,4-tetrahydrobenzo[ h]quinazolines. Org Biomol Chem 2022; 20:4559-4568. [PMID: 35593098 DOI: 10.1039/d2ob00674j] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Selective heterocyclization leading to 1,2,3,4-tetrahydrobenzo[h]quinazolines from ortho-ketimines of 1,8-bis(dimethylamino)naphthalene (DmanIms) under acid catalysis has been revealed. In contrast to the rather unreactive N,N-dimethylaniline ortho-ketimine, DmanIms readily undergo this transformation without an additional catalyst. This distinction in the reactivity underscores the importance of the second peri-NMe2 group in DmanIms, which facilitates a [1,5]-hydride shift and the subsequent cyclization. The cascade of peri-interactions emerging between 1-NMe2 and 8-NMe2 groups has been identified as a reason for the catalytic effect: (1) the hydrogen bond in the DmanIm dication constrains 1-NMe2 in the desired position providing proximity of reaction centers, (2) the repulsion of the lone pairs of 8-NMe2 group and unrelaxed 1-NMe2 group arising right after deprotonation process reduces the Gibbs free energy of activation (ΔG‡) for the straight hydride shift, and (3) the electrostatic interaction between 8-NMe2 and the charged NCH2+ group in the intermediate increases the ΔG‡ for the reverse hydride shift.
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Affiliation(s)
- Vladimir Y Mikshiev
- Institute of Chemistry, St Petersburg State University, Universitetskij pr. 26, 198504 St Petersburg, Russian Federation.
| | - Peter M Tolstoy
- Institute of Chemistry, St Petersburg State University, Universitetskij pr. 26, 198504 St Petersburg, Russian Federation.
| | - Aleksandra M Puzyk
- Institute of Chemistry, St Petersburg State University, Universitetskij pr. 26, 198504 St Petersburg, Russian Federation.
| | - Sergey O Kirichenko
- Institute of Chemistry, St Petersburg State University, Universitetskij pr. 26, 198504 St Petersburg, Russian Federation.
| | - Alexander S Antonov
- Institute of Chemistry, St Petersburg State University, Universitetskij pr. 26, 198504 St Petersburg, Russian Federation.
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9
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Bardakov VG, Yakubenko AA, Verkhov VA, Antonov AS. Organoboron Derivatives of 1,8-Bis(dimethylamino)naphthalene: Synthesis, Structure, Stability, and Reactivity. Organometallics 2022. [DOI: 10.1021/acs.organomet.2c00115] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Victor G. Bardakov
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, St. Petersburg 198504, Russian Federation
| | - Artyom A. Yakubenko
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, St. Petersburg 198504, Russian Federation
| | - Valeriy A. Verkhov
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, St. Petersburg 198504, Russian Federation
| | - Alexander S. Antonov
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, St. Petersburg 198504, Russian Federation
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Yakubenko AA, Puzyk AM, Korostelev VO, Mulloyarova VV, Tupikina EY, Tolstoy PM, Antonov AS. Self-association of diphenylpnictoginic acids in solution and solid state: covalent vs. hydrogen bonding. Phys Chem Chem Phys 2022; 24:7882-7892. [PMID: 35302575 DOI: 10.1039/d2cp00286h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Triphenylpnictogens were oxidized to access diphenylpnictioginic acids Ph2XOOH (X = P, As, Sb, Bi). It was shown that oxidation with chloramine-T does not lead to the cleavage of a C-pnictogen bond. The preliminary reductive cleavage with sodium in liquid ammonia followed by the oxidation with hydrogen peroxide was successfully utilised for the synthesis of diphenylphosphinic and diphenylarsinic acids. It was shown that in solid state (by means of XRD), all diphenylpnictoginic acids form polymeric chains. Diphenylbismuthinic and diphenylantimonic acids form polymeric covalent adducts, while diphenylphosphinic and diphenylarsinic chains are associated through hydrogen bonding. Unlike diphenylphosphinic acid, diphenilarsinic acid forms two polymorphs of hydrogen-bonded infinite chains. In solution in a polar aprotic solvent diphenylarsinic acid, similarly to dimethylarsinic, forms hydrogen-bonded cyclic dimers together with a small amount of cyclic trimers.
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Affiliation(s)
- Artyom A Yakubenko
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Aleksandra M Puzyk
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Vladislav O Korostelev
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Valeriia V Mulloyarova
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Elena Yu Tupikina
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Peter M Tolstoy
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Alexander S Antonov
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
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Yakubenko AA, Karpov VV, Tupikina EY, Antonov AS. Lithiation of 2,4,5,7-Tetrabromo-1,8-bis(dimethylamino)naphthalene: Peculiarities of Directing Groups’ Effects and the Possibility of Polymetalation. Organometallics 2021. [DOI: 10.1021/acs.organomet.1c00489] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Artyom A. Yakubenko
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
| | - Valerii V. Karpov
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
| | - Elena Yu. Tupikina
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
| | - Alexander S. Antonov
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
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Mulloyarova VV, Puzyk AM, Efimova AA, Antonov AS, Evarestov RA, Aliyarova IS, Asfin RE, Tolstoy PM. Solid-state and solution-state self-association of dimethylarsinic acid: IR, NMR and theoretical study. J Mol Struct 2021. [DOI: 10.1016/j.molstruc.2021.130176] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Antonov AS, Tupikina EY, Karpov VV, Mulloyarova VV, Bardakov VG. Sterically Facilitated Intramolecular Nucleophilic NMe 2 Group Substitution in the Synthesis of Fused Isoxazoles: Theoretical Study. Molecules 2020; 25:molecules25245977. [PMID: 33348591 PMCID: PMC7765840 DOI: 10.3390/molecules25245977] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2020] [Revised: 12/14/2020] [Accepted: 12/15/2020] [Indexed: 11/16/2022] Open
Abstract
The influence of steric repulsion between the NMe2 group and a second ortho-(peri-)substituent in the series of 1-dimethylaminonaphthalene and N,N-dimethylanilene ortho-oximes on the ease of the NMe2 group’s intramolecular nucleophilic substitution is studied. Possible reaction intermediates for three mechanisms are calculated (ωB97xd/def-2-TZVP), and their free Gibbs energies are compared to model reaction profiles. Supporting experiments have proved the absence of studied reactivity in the case of simple 2-dimethylaminobenzaldoxime, which allowed us to establish reactivity limits. The significant facilitation of NMe2 group displacement in the presence of bulky substituents is demonstrated. The possibility of fused isoxazoles synthesis via the intramolecular nucleophilic substitution of a protonated NMe2 group in the aniline and naphthalene series is predicted.
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Antonov AS, Karpov VV, Tupikina EY, Tolstoy PM, Vovk MA. Aggregation Behavior of Lithionaphthalenes in Solution: Experimental and Theoretical Study. Organometallics 2020. [DOI: 10.1021/acs.organomet.0c00524] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alexander S. Antonov
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Valerii V. Karpov
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Elena Yu. Tupikina
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Peter M. Tolstoy
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - Mikhail A. Vovk
- St. Petersburg State University, Institute of Chemistry, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
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Mikshiev VY, Pozharskii AF, Filarowski A, Novikov AS, Antonov AS, Tolstoy PM, Vovk MA, Khoroshilova OV. How Strong is Hydrogen Bonding to Amide Nitrogen? Chemphyschem 2020; 21:651-658. [PMID: 31953976 DOI: 10.1002/cphc.201901104] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2019] [Revised: 12/18/2019] [Indexed: 12/23/2022]
Abstract
The protonation of the carboxamide nitrogen atom is an essential part of in vivo and in vitro processes (cis-trans isomerization, amides hydrolysis etc). This phenomenon is well studied in geometrically strongly distorted amides, although there is little data concerning the protonation of undistorted amides. In the latter case, the participation of amide nitrogen in hydrogen bonding (which can be regarded as the incipient state of a proton transfer process) is less well-studied. Thus, it would be a worthy goal to investigate the enthalpy of this interaction. We prepared and investigated a set of peri-substituted naphthalenes containing the protonated dimethylamino group next to the amide nitrogen atom ("amide proton sponges"), which could serve as models for the study of an intramolecular hydrogen bond with the amide nitrogen atom. X-Ray analysis, NMR spectra, basicity values as well as quantum chemical calculations revealed the existence of a hydrogen bond with the amide nitrogen, that should be attributed to the borderline between moderate and weak intramolecular hydrogen bonds (2-7 kcal ⋅ mol-1 ).
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Affiliation(s)
- Vladimir Y Mikshiev
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
| | - Alexander F Pozharskii
- Department of Organic Chemistry, Southern Federal University, Zorge str. 7, 344090, Rostov-on-Don, Russian Federation
| | - Alexander Filarowski
- Faculty of Chemistry, Wroclaw University, F. Joliot-Curie str. 14, 50-383, Wroclaw, Poland
- Industrial University of Tyumen, Volodarskogo str. 38, 625000, Tyumen, Russian Federation
| | - Alexander S Novikov
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
| | - Alexander S Antonov
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
| | - Peter M Tolstoy
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
| | - Mikhail A Vovk
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
| | - Olesya V Khoroshilova
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504, St. Petersburg, Russian Federation
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16
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Tupikina EY, Denisov GS, Antonov AS, Tolstoy PM. Unusual behaviour of the spin-spin coupling constant 1J CH upon formation of CHX hydrogen bond. Phys Chem Chem Phys 2020; 22:1994-2000. [PMID: 31915781 DOI: 10.1039/c9cp05964d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
Abstract
One-bond coupling constants 1JXY are usually used as a measure of the corresponding XY interatomic distances. However, the physical nature of this correlation is not well understood and, in some cases, a counterintuitive behaviour of 1JXY upon hydrogen bonded complex formation has been reported. In this work, the behavior of 1JCH upon formation and strengthening of complexes with CHX hydrogen bonds and upon a proton transfer process is investigated by means of 1H NMR spectroscopy and quantum chemical calculations. 1H NMR spectra of 1,1-dinitroethane solution at room temperature in various solvents (carbon tetrachloride, chloroform, dichloromethane, acetone, dimethylformamide and dimethyl sulfoxide) illustrate the increase of 1JCH by several Hz upon an increase of the complex strength. Computational results (MP2/aug-cc-pVDZ) reproduce this observation and allow one to conclude that the increase of 1JCH is mainly caused by the change of the carbon hybridization (an increase of s-character), rather than by the change in interatomic distance rCH. The behavior of 1JCH was also examined computationally for a wide range of CHX hydrogen bond energies and geometries. For this purpose, quantum-chemical modeling of the partial proton transfer process for complexes formed by 1,1-dinitroethane and trinitromethane as hydrogen bond donors with acetone, pyridine and fluoride anion as hydrogen bond acceptors was performed. The obtained results have confirmed the above-mentioned idea - for rather weak complexes, the dominant impact on the change of 1JCH magnitude is the increase of the s-character of carbon atom hybridization, while for complexes with a significantly transferred proton, the exponential decrease of the Fermi-contact term dominates.
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Affiliation(s)
- Elena Yu Tupikina
- Institute of Chemistry, St. Petersburg State University, St. Petersburg 198504, Russia.
| | - Gleb S Denisov
- Department of Physics, St. Petersburg State University, St. Petersburg 198504, Russia
| | - Alexander S Antonov
- Institute of Chemistry, St. Petersburg State University, St. Petersburg 198504, Russia.
| | - Peter M Tolstoy
- Institute of Chemistry, St. Petersburg State University, St. Petersburg 198504, Russia.
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18
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Abstract
Noncovalent Li···H interaction was utilised as a tool for the second lithiation of 4-lithio-1,8-bis(dimethylamino)naphthalene with n-BuLi in the presence of TMEDA in hexane. Metallation proceeds with 100% selectivity in the second peri-position and with up to 90% yield. A series of 4,5-disubstituted derivatives of 1,8-bis(dimethylamino)naphthalene has been prepared in good to excellent yield after quenching the reaction mass with different electrophiles.
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19
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Pozharskii AF, Ozeryanskii VA, Mikshiev VY, Chernyshev AV, Metelitsa AV, Antonov AS. Proton-induced fluorescence in modified quino[7,8-h]quinolines: dual sensing for protons and π-donors. Org Biomol Chem 2019; 17:8221-8233. [PMID: 31436774 DOI: 10.1039/c9ob01391a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The synthesis, as well as spectral, structural and photoluminescence properties of dipyrido[3,2-e:2',3'-h]acenaphthene 5 and quinazolino[7,8-h]quinazolines 6 as representatives of the bidentate -N[double bond, length as m-dash]/-N[double bond, length as m-dash] superbases, are reported. These nitrogen bases being more rigid (5) or π-extended (6) analogs of optically-mute quino[7,8-h]quinoline are both active in terms of fluorescence with quantum yields up to φ = 0.71-0.77. At the same time, their luminescence behavior is opposite to that of peri-NMe2/NMe2 naphthalene proton sponges and their hybrid NMe2/-N[double bond, length as m-dash] analogs. Although 5 and 6 exhibit visible region emission upon protonation, for the hybrid systems the fluorescence is manifested only for bases. The most remarkable observation is that the fluorescence of compound 5 can be switched on not only by means of organic or inorganic acids, but also through the formation of chelate complexes with such weak H-donors as water and primary alcohols. It was disclosed that water is present in the complex as a cluster comprising 8 interconnected H2O molecules. Overall, the studied compounds demonstrate a previously unobserved type of dual mode optical response, H-sensing (emission enhancement in 5 and 6 on protonation) and π-sensing (emission quenching in 5H+ and 6H+ on coordination with π-donors). This work seems to be an important contribution to areas such as chemosensorics, the creation of new ligands, hydrogen transfer and some other phenomena representing different types of supramolecular interactions.
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Affiliation(s)
- Alexander F Pozharskii
- Department of Organic Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation.
| | - Valery A Ozeryanskii
- Department of Organic Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation.
| | - Vladimir Y Mikshiev
- Department of Organic Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation.
| | - Anatoly V Chernyshev
- Institute of Physical and Organic Chemistry, Southern Federal University, Stachki Ave. 194/2, 344090 Rostov-on-Don, Russian Federation
| | - Anatoly V Metelitsa
- Institute of Physical and Organic Chemistry, Southern Federal University, Stachki Ave. 194/2, 344090 Rostov-on-Don, Russian Federation
| | - Alexander S Antonov
- Department of Organic Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation.
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Antonov AS, Leshchenko EV, Zhuravleva OI, Dyshlovoy SA, von Amsberg G, Popov RS, Denisenko VA, Kirichuk NN, Afiyatullov SS. Naphto-Γ-pyrones from the marine-derived fungus Aspergillus foetidus. Nat Prod Res 2019; 35:131-134. [PMID: 31242774 DOI: 10.1080/14786419.2019.1610954] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Abstract
Nine naphto-γ-pyrones rubrofusarine B (1), TMC 256 A1 (2), fansecinones A (3) and B (4), aurasperones A (5), B (6) and F (7), dianhydro-aurasperone C (8) and asperpyrone B (9) were isolated from the marine-derived fungus Aspergillus foetidus KMM 4694. Their structures were established based on spectroscopic methods. The effect of the substances on viability and colony formation of human drug-resistant prostate cancer 22Rv1 cell was evaluated.
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Affiliation(s)
- Alexander S Antonov
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Vladivostok, Russian Federation
| | - Elena V Leshchenko
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Vladivostok, Russian Federation.,Far Eastern Federal University, Vladivostok, Russian Federation
| | - Olesya I Zhuravleva
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Vladivostok, Russian Federation.,Far Eastern Federal University, Vladivostok, Russian Federation
| | - Sergey A Dyshlovoy
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Vladivostok, Russian Federation.,Far Eastern Federal University, Vladivostok, Russian Federation.,Department of Oncology, Hematology and Bone Marrow Transplantation with Section Pneumology, Hubertus Wald-Tumorzentrum, University Medical Center Hamburg-Eppendorf, Humburg, Germany
| | - Gunhild von Amsberg
- Department of Oncology, Hematology and Bone Marrow Transplantation with Section Pneumology, Hubertus Wald-Tumorzentrum, University Medical Center Hamburg-Eppendorf, Humburg, Germany
| | - Roman S Popov
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Vladivostok, Russian Federation
| | - Vladimir A Denisenko
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Vladivostok, Russian Federation
| | - Natalya N Kirichuk
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Vladivostok, Russian Federation
| | - Shamil Sh Afiyatullov
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Vladivostok, Russian Federation
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Antonov AS, Pozharskii AF, Tolstoy PM, Filarowski A, Khoroshilova OV. 1,8-Bis(dimethylamino)naphthyl-2-ketimines: Inside vs outside protonation. Beilstein J Org Chem 2018; 14:2940-2948. [PMID: 30546478 PMCID: PMC6278759 DOI: 10.3762/bjoc.14.273] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2018] [Accepted: 11/15/2018] [Indexed: 11/26/2022] Open
Abstract
The structure and protonation behaviour of four ortho-arylketimines of 1,8-bis(dimethylamonio)naphthalene with a different number of methoxy groups in an aromatic substituent were investigated in solution by NMR (acetone, DMSO, MeCN), in solid state by X-ray analysis and in the gas phase by DFT calculations. Both mono- and diprotonated species were considered. It has been shown that E-isomers of neutral imines can be stabilised by an intramolecular C=N−H···OMe hydrogen bond with a neighbouring methoxy group. Electron-donating OMe groups dramatically increase the basicity of the imino nitrogen, forcing the latter to abstract a proton from the proton sponge moiety in monoprotonated forms. The participation of the out-inverted and protonated 1-NMe2 group in the Me2N−H···NH=C hydrogen bond is experimentally demonstrated. It was shown that the number and position of OMe groups in the aromatic substituents strongly affects the rate of the internal hindered rotation of the NH2+ fragment in dications.
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Affiliation(s)
- A S Antonov
- Department of Organic Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation.,Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - A F Pozharskii
- Department of Organic Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
| | - P M Tolstoy
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
| | - A Filarowski
- Faculty of Chemistry, University of Wroclaw, F. Joliot-Curie 14, 50-383 Wroclaw, Poland.,Department of Physics, Industrial University of Tyumen, Volodarskogo 38, 625-000 Tyumen, Russian Federation
| | - O V Khoroshilova
- Institute of Chemistry, St. Petersburg State University, Universitetskii pr. 26, 198504 St. Petersburg, Russian Federation
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22
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Mazurov AV, Vinogradov DV, Kabaeva NV, Antonova GN, Romanov YA, VIasik TN, Antonov AS, Smirnov VN. A Monoclonal Antibody, VM64, Reacts with a 130 kDa Glycoprotein Common to Platelets and Endothelial Cells: Heterogeneity in Antibody Binding to Human Aortic Endothelial Cells. Thromb Haemost 2018. [DOI: 10.1055/s-0038-1646445] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
Abstract
SummaryA new monoclonal antibody (mAb), VM64, reacts with a common antigen on the surface of human platelets and vascular endothelial cells (EC). Under nonreduced conditions it recognized in immunoblotting a protein of 130 kDa both in platelets and EC. VM64 precipitated the same 130 kDa protein from the lysate of surface radioiodinated platelets. Electrophoretic mobility of this protein was not altered by reduction and differed from the bands precipitated by reference mAb against platelet glycoproteins (GP) Ia–IIa, Ib, IIb–IIIa and GMP130. VM64 binding to platelets and EC was specific and saturable. The number of binding sites on platelets was 9.9 ± 3.5 × 103 per platelet and on the surface of EC monolayer – 2.40 ± 0.32 × 106 per cell. VM64 also binds to platelets from Glanzmann's thrombasthenia patients which lack GPIIb–IIIa. VM64 did not affect platelet aggregation induced by ADP, collagen, thrombin and ristocetin. In the monolayers of EC from umbilical vein and human aorta, VM64 stained the area at the periphery of the cells adjacent to the cell-cell boundaries. In preconfluent cultures preferential staining was observed at the active leading margins of the cells. Unlike EC cultures from umbilical vein, where all cells were positively stained, in aortic EC cultures some unstained or poorly stained cells were constantly present, indicating a heterogeneity of EC population related to the expression of VM64 antigen. The biochemical characteristics of VM64 antigen, its presence both on platelets and EC and typical distribution on the surface of EC suggested that this antigen is identical to PECAM (CD31) protein.
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Affiliation(s)
- Alexey V Mazurov
- The Institute of Experimental Cardiology, Cardiology Research Center, Moscow, USSR
| | - Dimitry V Vinogradov
- The Institute of Experimental Cardiology, Cardiology Research Center, Moscow, USSR
| | - Naile V Kabaeva
- The Institute of Experimental Cardiology, Cardiology Research Center, Moscow, USSR
| | - Galina N Antonova
- The Institute of Experimental Cardiology, Cardiology Research Center, Moscow, USSR
| | - Yuri A Romanov
- The Institute of Experimental Cardiology, Cardiology Research Center, Moscow, USSR
| | - Tatjana N VIasik
- The Institute of Experimental Cardiology, Cardiology Research Center, Moscow, USSR
| | - Alexander S Antonov
- The Institute of Experimental Cardiology, Cardiology Research Center, Moscow, USSR
| | - Vladimir N Smirnov
- The Institute of Experimental Cardiology, Cardiology Research Center, Moscow, USSR
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Antonov AS, Bardakov VG, Pozharskii AF, Vovk MA, Misharev AD. Laying the way to meta -functionalization of naphthalene proton sponge via the use of Schlosser's superbase. J Organomet Chem 2018. [DOI: 10.1016/j.jorganchem.2017.12.007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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24
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Antonov AS, Kachalkina SG, Pozharskii AF, Borodkin GS, Filarowski A. Reaction of 2-trifluoroacetyl-1,8-Bis(dimethylamino)naphthalene with strong organic bases: Deprotonation of 1-NMe 2 group resulting in the formation of Benzo[g]indole derivatives versus nucleophilic addition to C O group. Tetrahedron 2017. [DOI: 10.1016/j.tet.2017.05.013] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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25
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Pozharskii AF, Ozeryanskii VA, Mikshiev VY, Antonov AS, Chernyshev AV, Metelitsa AV, Borodkin GS, Fedik NS, Dyablo OV. 10-Dimethylamino Derivatives of Benzo[h]quinoline and Benzo[h]quinazolines: Fluorescent Proton Sponge Analogues with Opposed peri-NMe2/–N═ Groups. How to Distinguish between Proton Sponges and Pseudo-Proton Sponges. J Org Chem 2016; 81:5574-87. [DOI: 10.1021/acs.joc.6b00917] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Alexander F. Pozharskii
- Department
of Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
| | - Valery A. Ozeryanskii
- Department
of Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
| | - Vladimir Y. Mikshiev
- Department
of Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
| | - Alexander S. Antonov
- Department
of Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
| | - Anatoly V. Chernyshev
- Institute
of Physical and Organic Chemistry, Southern Federal University, Stachki
Ave. 194/2, 344090 Rostov-on-Don, Russian Federation
| | - Anatoly V. Metelitsa
- Institute
of Physical and Organic Chemistry, Southern Federal University, Stachki
Ave. 194/2, 344090 Rostov-on-Don, Russian Federation
| | - Gennady S. Borodkin
- Institute
of Physical and Organic Chemistry, Southern Federal University, Stachki
Ave. 194/2, 344090 Rostov-on-Don, Russian Federation
| | - Nikita S. Fedik
- Department
of Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
| | - Olga V. Dyablo
- Department
of Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation
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26
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Mikshiev VY, Antonov AS, Pozharskii AF. Tandem Synthesis of 10-Dimethylaminobenzo[h]quinazolines from 2-Ketimino-1,8-bis(dimethylamino)naphthalenes via Nucleophilic Replacement of the Unactivated Aromatic NMe2 Group. Org Lett 2016; 18:2872-5. [DOI: 10.1021/acs.orglett.6b01178] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Vladimir Y. Mikshiev
- Department of Organic Chemistry, Southern Federal University, Zorge
str. 7, 344090 Rostov-on-Don, Russian Federation
| | - Alexander S. Antonov
- Department of Organic Chemistry, Southern Federal University, Zorge
str. 7, 344090 Rostov-on-Don, Russian Federation
| | - Alexander F. Pozharskii
- Department of Organic Chemistry, Southern Federal University, Zorge
str. 7, 344090 Rostov-on-Don, Russian Federation
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27
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Antonov AS, Pozharskii AF, Ozeryanskii VA, Filarowski A, Suponitsky KY, Tolstoy PM, Vovk MA. Ring lithiation of 1,8-bis(dimethylamino)naphthalene: another side of the ‘proton sponge coin’. Dalton Trans 2015; 44:17756-66. [DOI: 10.1039/c5dt02482j] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A set of X-ray, multinuclear NMR and DFT approaches was used to address a question of selectivity, relative stability and enhanced reactivity of ring lithiated 1,8-bis(dimethylamino)naphthalenes.
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Affiliation(s)
- Alexander S. Antonov
- Department of Organic Chemistry
- Southern Federal University
- 344090 Rostov-on-Don
- Russian Federation
| | - Alexander F. Pozharskii
- Department of Organic Chemistry
- Southern Federal University
- 344090 Rostov-on-Don
- Russian Federation
| | - Valery A. Ozeryanskii
- Department of Organic Chemistry
- Southern Federal University
- 344090 Rostov-on-Don
- Russian Federation
| | - Aleksander Filarowski
- Faculty of Chemistry
- University of Wroclaw
- 50-383 Wroclaw
- Poland
- Frank Laboratory of Neutron Physics
| | - Kyrill Yu. Suponitsky
- Nesmeyanov Institute of Organoelement Compounds
- Russian Academy of Sciences
- 119991 Moscow
- Russian Federation
| | - Peter M. Tolstoy
- Department of Chemistry
- St. Petersburg State University
- 198504 St. Petersburg
- Russian Federation
| | - Mikhail A. Vovk
- Department of Chemistry
- St. Petersburg State University
- 198504 St. Petersburg
- Russian Federation
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Ozeryanskii VA, Pozharskii AF, Antonov AS, Filarowski A. Out-basicity of 1,8-bis(dimethylamino)naphthalene: the experimental and theoretical challenge. Org Biomol Chem 2014; 12:2360-9. [PMID: 24522408 DOI: 10.1039/c3ob41986j] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
A possibility of non-conventional two-step protonation of 1,8-bis(dimethylamino)naphthalene (proton sponge) is discussed. Unlike the generally accepted mechanism, involving relatively slow direct penetration of a proton into the cleft between the peri-NMe2 groups, it consists of the rapid addition of a proton to the out-inverted NMe2 group with the subsequent slower rotational transfer of the proton into the inter-nitrogen space to produce a stable chelated cation. The following approaches were employed during the work: (1) competitive hydrogen bond formation in a specially designed alcohol in which the OH group might chelate either the proton sponge 1-NMe2 group or another basic center (N,N-dimethylaniline) of known basicity; (2) measuring the basicity of naphtho[1,8-b,c]diazabicyclo[3.3.3]undecane considered to be a close analogue of the proton sponge capable exclusively of out-protonation; (3) X-ray, spectral and DFT studies of structure, energy and stereodynamics of compounds obtained, including their conformers. For the first time, the pKa value of an organic base with a perfectly flat nitrogen atom is reported. The final conclusion is made that both pathways of proton sponge protonation, traditional and non-conventional, contribute in parallel with a still undefined ratio. The estimated out-basicity of the proton sponge is at least 5.5 orders of magnitude lower than the directly measured in-basicity.
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Affiliation(s)
- Valery A Ozeryanskii
- Department of Organic Chemistry, Southern Federal University, Zorge str. 7, 344090 Rostov-on-Don, Russian Federation.
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Kicha AA, Kalinovsky AI, Antonov AS, Radchenko OS, Ivanchina NV, Malyarenko TV, Savchenko AM, Stonik VA. Determination of C-23 configuration in (20R)-23-hydroxycholestane side chain of steroid compounds by 1H and 13C NMR spectroscopy. Nat Prod Commun 2013; 8:1219-1222. [PMID: 24273850] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/02/2023] Open
Abstract
Epimeric (20R,23R)- and (20R,23S)-23-hydroxycholestane steroids were synthesized. Their structures were elucidated by extensive 1H and 13C NMR spectroscopy and application of the Mosher's method. All proton and carbon signals of the side chains were assigned. Based on these assignments spectral data allow the determination of the C-23 stereochemistry of (20R)-23-hydroxycholestane side chains of the new natural steroids by comparison with spectra of the obtained model compounds. As a result, the C-23 configuration of two steroid compounds from the starfishes Lethasterias nanimensis chelifera and Lethasterias fusca was established.
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Affiliation(s)
- Alla A Kicha
- G.B Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok 690022, Russia.
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Kicha AA, Kalinovsky AI, Antonov AS, Radchenko OS, Ivanchina NV, Malyarenko TV, Savchenko AM, Stonik VA. Determination of C-23 Configuration in (20 R)-23-Hydroxycholestane Side Chain of Steroid Compounds by 1H and 13C NMR Spectroscopy. Nat Prod Commun 2013. [DOI: 10.1177/1934578x1300800908] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
Abstract
Epimeric (20 R,23 R)- and (20 R,23 S)-23-hydroxycholestane steroids were synthesized. Their structures were elucidated by extensive 1H and 13C NMR spectroscopy and application of the Mosher's method. All proton and carbon signals of the side chains were assigned. Based on these assignments spectral data allow the determination of the C-23 stereochemistry of (20 R)-23-hydroxycholestane side chains of the new natural steroids by comparison with spectra of the obtained model compounds. As a result, the C-23 configuration of two steroid compounds from the starfishes Lethasterias nanimensis chelifera and Lethasterias fusca was established.
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Affiliation(s)
- Alla A. Kicha
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok 690022, Russia
| | - Anatoly I. Kalinovsky
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok 690022, Russia
| | - Alexander S. Antonov
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok 690022, Russia
| | - Oleg S. Radchenko
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok 690022, Russia
| | - Natalia V. Ivanchina
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok 690022, Russia
| | - Timofey V. Malyarenko
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok 690022, Russia
| | | | - Valentin A. Stonik
- G.B. Elyakov Pacific Institute of Bioorganic Chemistry, Far Eastern Branch of the Russian Academy of Sciences, Vladivostok 690022, Russia
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Antonov AS, Antonova GN, Fujii M, ten Dijke P, Handa V, Catravas JD, Verin AD. Regulation of endothelial barrier function by TGF-β type I receptor ALK5: potential role of contractile mechanisms and heat shock protein 90. J Cell Physiol 2012; 227:759-71. [PMID: 21465483 DOI: 10.1002/jcp.22785] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023]
Abstract
Multifunctional cytokine transforming growth factor-beta (TGF-β1) plays a critical role in the pathogenesis of acute lung inflammation by controlling endothelial monolayer permeability. TGF-β1 regulates endothelial cell (EC) functions via two distinct receptors, activin receptor-like kinase 1 (ALK1) and activin receptor-like kinase 5 (ALK5). The precise roles of ALK1 and ALK5 in the regulation of TGF-β1-induced lung endothelium dysfunction remain mostly unknown. We now report that adenoviral infection with constitutively active ALK5 (caALK5), but not caALK1, induces EC retraction and that this receptor predominantly controls EC permeability. We demonstrate that ubiquitinated ALK5 and phosphorylated heat shock protein 27 (phospho-Hsp27) specifically accumulate in the cytoskeleton fraction, which parallels with microtubule collapse, cortical actin disassembly and increased EC permeability. We have found that ALK1 and ALK5 interact with heat shock protein 90 (Hsp90). Moreover, the Hsp90 inhibitor radicicol (RA) prevents accumulation of ubiquitinated caALK5 and phospho-Hsp27 in the cytoskeletal fraction and restore the decreased EC permeability induced by caALK5. We hypothesize that specific translocation of ubiquitinated ALK5 receptor into the cytoskeleton compartment due to its lack of degradation is the mechanism that causes the divergence of caALK1 and caALK5 signaling.
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Affiliation(s)
- Alexander S Antonov
- Vascular Biology Center, Medical College of Georgia, Augusta, Georgia 30912, USA
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Povalyakhina MA, Antonov AS, Dyablo OV, Ozeryanskii VA, Pozharskii AF. H-Bond-Assisted Intramolecular Nucleophilic Displacement of the 1-NMe2 Group in 1,8-Bis(dimethylamino)naphthalenes as a Route to Multinuclear Heterocyclic Compounds and Strained Naphthalene Derivatives. J Org Chem 2011; 76:7157-66. [DOI: 10.1021/jo201171z] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Maria A. Povalyakhina
- Department of Organic Chemistry, Southern Federal University, Zorge 7, 344090 Rostov-on-Don, Russian Federation
| | - Alexander S. Antonov
- Department of Organic Chemistry, Southern Federal University, Zorge 7, 344090 Rostov-on-Don, Russian Federation
| | - Olga V. Dyablo
- Department of Organic Chemistry, Southern Federal University, Zorge 7, 344090 Rostov-on-Don, Russian Federation
| | - Valery A. Ozeryanskii
- Department of Organic Chemistry, Southern Federal University, Zorge 7, 344090 Rostov-on-Don, Russian Federation
| | - Alexander F. Pozharskii
- Department of Organic Chemistry, Southern Federal University, Zorge 7, 344090 Rostov-on-Don, Russian Federation
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Antonov AS, Antonova GN, Munn DH, Mivechi N, Lucas R, Catravas JD, Verin AD. αVβ3 integrin regulates macrophage inflammatory responses via PI3 kinase/Akt-dependent NF-κB activation. J Cell Physiol 2011; 226:469-76. [PMID: 20672329 DOI: 10.1002/jcp.22356] [Citation(s) in RCA: 87] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
Abstract
Controlling macrophage responses to pathogenic stimuli is critical for prevention of and recovery from the inflammatory state associated with the pathogenesis of many diseases. The adhesion receptor αVβ3 integrin is thought to be an important receptor that regulates macrophage differentiation and macrophage responses to external signaling, but it has not been previously identified as a contributor to macrophage-related inflammation. Using an in vitro model of human blood monocytes (Mo) and monocyte-derived macrophages (MDMs) we demonstrate that αVβ3 ligation results in sustained increases of the transcription factor NF-κB DNA-binding activity, as compared with control isotype-matched IgG(1). Activation of NF-κB parallels the increase of NF-κB-dependent pro-inflammatory cytokine mRNA expression in MDMs isolated from individual donors, for example, TNF-α (8- to 28-fold), IL-1β (15- to 30-fold), IL-6 (2- to 4-fold), and IL-8 (5- to 15-fold) whereas there is more than a 10-fold decrease in IL-10 mRNA level occurs. Upon ligation of the αVβ3 receptor, treatment with TNF-α (10 ng/ml) or LPS (200 ng/ml, 1,000 EU) results in the enhanced and synergistic activation of NF-κB and LPS-induced TNF-α secretion. As additional controls, an inhibitor of αVβ3 integrin, cyclic RGD (10 µg/ml; IC(50) = 7.6 µM), attenuates the effects of αVβ3 ligation, and the natural ligand of αVβ3 integrin, vitronectin, reproduces the effects of αVβ3 activation by an immobilizing anti-αVβ3 integrin mAb. We hypothesize that αVβ3 activation can maintain chronic inflammatory processes in pathological conditions and that the loss of αVβ3 ligation will allow macrophages to escape from the inflammatory state.
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Affiliation(s)
- Alexander S Antonov
- Vascular Biology Center, Medical College of Georgia, Augusta, Georgia 30912, USA
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Logacheva MD, Penin AA, Val'ekho-Roman KM, Antonov AS. [Structure and evolution of junctions between inverted repeat and small single copy regions of chloroplast genome in non-core Caryophyllales]. Mol Biol (Mosk) 2009; 43:818-827. [PMID: 19899629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
The structure of junction between inverted repeat (IR) and small single copy (SSC) regions of chloroplast genome in the representatives of non-core Caryophyllales is investigated in this work. It was found that for two families - Polygonaceae and Plumbaginaceae - the extension of inverted region is characteristic. This extension is due to the duplication the part of ycf1 gene that is partly located in the small single copy region in plants with typical structure of IR/SSC junctions. Comparison of the position of IR/SSC junctions in different species of Polygonaceae has shown that their exact position is not correlated with the affinity of these species inferred from molecular and morphological data. Possible mechanisms leading to the change in position of IR/SSC junctions observed in this work are discussed.
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Avilov SA, Silchenko AS, Antonov AS, Kalinin VI, Kalinovsky AI, Smirnov AV, Dmitrenok PS, Evtushenko EV, Fedorov SN, Savina AS, Shubina LK, Stonik VA. Synaptosides A and A1, triterpene glycosides from the sea cucumber Synapta maculata containing 3-O-methylglucuronic acid and their cytotoxic activity against tumor cells. J Nat Prod 2008; 71:525-531. [PMID: 18290630 DOI: 10.1021/np070283+] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Two novel triterpene holostane glycosides, synaptosides A ( 1) and A 1 ( 2), have been isolated from the Vietnamese sea cucumber Synapta maculata (Synaptida, Apodida). Their structures were elucidated by spectroscopic methods (NMR and MS) and chemical transformations. Glycosides 1 and 2 have rare branched pentasaccharide carbohydrate chains featuring a 3- O-methylglucuronic acid residue not previously reported in glycosides from sea cucumbers and a 6- O-sulfated glucose. Glycoside 2 has an oxo group at C-7 and a 8(9)-double bond. All these structural features are unknown in glycosides from sea cucumbers. Glycoside 1 has moderate cytotoxic activity (IC 50 8.6 microg/mL) and glycoside 2 is inactive against HeLa tumor cells.
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Affiliation(s)
- Sergey A Avilov
- Pacific Institute of Bioorganic Chemistry, Far East Branch of the Russian Academy of Sciences, Vladivostok, Russian Federation
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Logacheva MD, Penin AA, Samigullin TH, Vallejo-Roman CM, Antonov AS. Phylogeny of flowering plants by the chloroplast genome sequences: in search of a "lucky gene". Biochemistry (Mosc) 2008; 72:1324-30. [PMID: 18205616 DOI: 10.1134/s0006297907120061] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
One of the most complicated remaining problems of molecular-phylogenetic analysis is choosing an appropriate genome region. In an ideal case, such a region should have two specific properties: (i) results of analysis using this region should be similar to the results of multigene analysis using the maximal number of regions; (ii) this region should be arranged compactly and be significantly shorter than the multigene set. The second condition is necessary to facilitate sequencing and extension of taxons under analysis, the number of which is also crucial for molecular phylogenetic analysis. Such regions have been revealed for some groups of animals and have been designated as "lucky genes". We have carried out a computational experiment on analysis of 41 complete chloroplast genomes of flowering plants aimed at searching for a "lucky gene" for reconstruction of their phylogeny. It is shown that the phylogenetic tree inferred from a combination of translated nucleotide sequences of genes encoding subunits of plastid RNA polymerase is closest to the tree constructed using all protein coding sites of the chloroplast genome. The only node for which a contradiction is observed is unstable according to the different type analyses. For all the other genes or their combinations, the coincidence is significantly worse. The RNA polymerase genes are compactly arranged in the genome and are fourfold shorter than the total length of protein coding genes used for phylogenetic analysis. The combination of all necessary features makes this group of genes main candidates for the role of "lucky gene" in studying phylogeny of flowering plants.
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Affiliation(s)
- M D Logacheva
- Faculty of Bioengineering and Bioinformatics, Lomonosov Moscow State University, Moscow, 119991, Russia.
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Abstract
A brief history of comparative studies of nucleic acids for systematic purposes is given. These studies were initiated by a group of Moscow State University scientists headed by A. N. Belozersky. Based mostly on comparative DNA studies, some main dogmas of a new branch of systematics were gradually developed. In Russia, this new branch of systematics is called "genosystematics". Some of the main results obtained by genosystematics since its birth (1957) and up to its "christening" (1974) are described.
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Affiliation(s)
- A S Antonov
- Faculty of Biology, Lomonosov Moscow State University, Moscow, 119992, Russia.
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Antonov AS, Snead C, Verin AD, Catravas JD. Barrier‐protective effects of hsp90 inhibitors in bovine pulmonary arterial endothelial cells. FASEB J 2007. [DOI: 10.1096/fasebj.21.6.a1430-d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Alexander S Antonov
- Vascular Biology CenterMedical College of Georgia1459 Laney Walker BlvdAugustaGA30912
| | - Connie Snead
- Vascular Biology CenterMedical College of Georgia1459 Laney Walker BlvdAugustaGA30912
| | - Alexander D Verin
- Vascular Biology CenterMedical College of Georgia1459 Laney Walker BlvdAugustaGA30912
| | - John D Catravas
- Vascular Biology CenterMedical College of Georgia1459 Laney Walker BlvdAugustaGA30912
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Antonova GN, Snead CM, Antonov AS, Dimitropoulou C, Venema RC, Catravas JD. Nitric oxide preconditioning regulates endothelial monolayer integrity via the heat shock protein 90-soluble guanylate cyclase pathway. Am J Physiol Heart Circ Physiol 2006; 292:H893-903. [PMID: 17012359 DOI: 10.1152/ajpheart.00498.2006] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Large (pathological) amounts of nitric oxide (NO) induce cell injury, whereas low (physiological) NO concentrations often ameliorate cell injury. We tested the hypotheses that pretreatment of endothelial cells with low concentrations of NO (preconditioning) would prevent injury induced by high NO concentrations. Apoptosis, induced in bovine aortic endothelial cells (BAECs) by exposing them to either 4 mM sodium nitroprusside (SNP) or 0.5 mM N-(2-aminoethyl)-N-(2-hydroxy-2-nitrosohydrazino)-1,2-ethylenediamine (spermine NONOate) for 8 h, was abolished by 24-h pretreatment with either 100 microM SNP, 10 microM spermine NONOate, or 100 microM 8-bromo-cGMP (8-Br-cGMP). Repair of BAECs following wounding, measured as the recovery rate of transendothelial electrical resistance, was delayed by 8-h exposure to 4 mM SNP, and this delay was significantly attenuated by 24-h pretreatment with 100 microM SNP. NO preconditioning produced increased association and expression of soluble guanyl cyclase (sGC) and heat shock protein 90 (HSP90). The protective effect of NO preconditioning, but not the injurious effect of 4 mM SNP, was abolished by either a sGC activity inhibitor 1H-[1,2,4]oxadiazolo-[4,3-a]quinoxalin-1-one (ODQ) or a HSP90 binding inhibitor (radicicol) and was mimicked by 8-Br-cGMP. We conclude that preconditioning with a low dose of NO donor accelerates repair and maintains endothelial integrity via a mechanism that includes the HSP90/sGC pathway. HSP90/sGC may thus play a role in the protective effects of NO-generating drugs from injurious stimuli.
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Affiliation(s)
- Galina N Antonova
- Vascular Biology Center, Medical College of Georgia, Augusta, GA, 30912-2500, USA.
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Antonov AS. [Genosystematics: from E. Chargaff and A. N. Belozersky up to date]. Mol Biol (Mosk) 2005; 39:581-9. [PMID: 16083007] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
A review of history of genosystematics (macromolecular systematics) from E. Chargaff and A. N. Belozersky up to date. The role of A.N. Belozersky and his collaborators in the development of this new branch of systematics is analyzed. Genosystematics was the source of valuable information clarifying some aspects of biological evolution. Its methods were successfully employed in microorganisms--(e.g., discovery of archaebacteria) and in eucaryote systematics (origin of plastids, falcification of "molecular clock" hypothesis, substantial changes in higher plants phylogenetics, etc.). However, attempts to employ some fragmentary and unreliable data obtained by genosystematics for modifying the existing phylogenetic schemes and systems of organisms failed. Nowadays genosystematics is like a newborn child suffering from children's diseases well-known to "classical" systematics. It is rather far from final conclusions describing the evolution of genotypes. Some of its recent achievments, e.g., elaboration of the concept of PhyloCode, allow to believe that this science is able to suggest revolutionary changes in Linnean systematics.
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Moraes G, Northcote PT, Silchenko AS, Antonov AS, Kalinovsky AI, Dmitrenok PS, Avilov SA, Kalinin VI, Stonik VA. Mollisosides A, B1, and B2: minor triterpene glycosides from the New Zealand and South Australian sea cucumber Australostichopus mollis. J Nat Prod 2005; 68:842-7. [PMID: 15974605 DOI: 10.1021/np050049o] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Three new monosulfated triterpene glycosides, mollisosides A (2), B(1) (3), and B(2) (4), have been isolated from the sea cucumber Australostichopus mollis. Their structures were determined by NMR and mass spectra. The presence of sulfated glycosides in sea cucumbers belonging to the family Stichopodidae is uncommon.
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Affiliation(s)
- Greta Moraes
- Industrial Research Ltd. (IRL), Lower Hutt, New Zealand
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Antonov AS, Kolodgie FD, Munn DH, Gerrity RG. Regulation of macrophage foam cell formation by alphaVbeta3 integrin: potential role in human atherosclerosis. Am J Pathol 2004; 165:247-58. [PMID: 15215180 PMCID: PMC1618536 DOI: 10.1016/s0002-9440(10)63293-2] [Citation(s) in RCA: 92] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The accumulation of macrophage foam cells in atherosclerotic lesions is associated with both initiation and progression of this disease. Scavenger receptors CD36 and SRA are the primary receptors responsible for conversion of macrophages into foam cells. Integrin alphaVbeta3 plays a role in the differentiation of several cell types, but its involvement in the transition of macrophages into foam cells and the potential role of this receptor in atherosclerosis have not been examined. Using an in vitro model of single surface receptor activation by binding with an immobilized monoclonal antibody specific to alphaVbeta3 integrin we show that ligation of alphaVbeta3 integrin prevents differentiation of blood monocytes and macrophages into the foam cell phenotype via coordinate down-regulation of CD36 and SRA. This effect of alphaVbeta3 integrin ligation can be reproduced by contact with endothelial cells, whereas the inhibition of alphaVbeta3 receptor ligation restores the uptake of oxidized low-density lipoprotein. Moreover, we found that alphaVbeta3 integrin is readily detected in situ on macrophages in early and advanced atherosclerotic lesions and that in vitro exposure to oxidized low-density lipoprotein up-regulates alphaVbeta3 integrin expression. We hypothesize that alphaVbeta3 integrin regulates macrophage functional maturation into foam cells in a persistent manner, and therefore, by targeting alphaVbeta3 receptor it could potentially be possible to regulate progression of atherosclerosis in humans.
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Affiliation(s)
- Alexander S Antonov
- Department of Pathology, BF 231, Medical College of Georgia, 1120 15th Street, Augusta, GA 30912, USA.
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Antonov AS. [On interrelation between genetic systematics and genomics]. Zh Obshch Biol 2003; 64:181-6. [PMID: 12723374] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 03/02/2023]
Abstract
Review papers describing recent achievements of genomics usually do not pay attention to direct interrelation between genomics and genosystematics (DNA-systematics). Genomics on general is based in complete DNA sequencing of genomes. Initial aim of genosystematics was the same. Absence of historical perspective in review papers devoted to genomics decreases its value. In case it is done deliberately it becomes the problem of scientific ethics. It is postulated that genomics is a natural stage of genosystematics (DNA-systematics) development. Russian scientists were among the founders of these branches of biology.
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Affiliation(s)
- A S Antonov
- Dept. of Higher Plants of Biological Faculty and Institute of Physical-Chemical Biology of M. V. Lomonosov Moscow State University, 119899 Moscow.
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Antonov AS. [Genomics and genosystematics]. Genetika 2002; 38:751-757. [PMID: 12138774] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A survey of publications dealing with comparative analysis of genomes shows that modern genomics has naturally evolved from gene systematics--an area whose formation and development was greatly influenced by the scientific school of A.N. Belozersky.
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Affiliation(s)
- A S Antonov
- Belozersky Research Institute of Physicochemical Biology, Lomonosov Moscow State University, Moscow, 119992 Russia.
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Abstract
New triterpene glycosides, ulososides C, (20S,22S,23R,24S)-3 beta,22, 23-trihydroxy-3-O-(beta-D-glucopyranosyl)-32-nor-24-methyllanost- 8(9)-ene-30-oic acid, D, (20S,22S,23R,24S)-3 beta,22, 23-trihydroxy-3-O-(beta-D-N-acetyl-glucosaminopyranosyl)-32-nor- 24-methyllanost-8(9)-ene-30-oic acid, and E, (20S,22S,23R,24S)-3 beta,22, 23-trihydroxy-3-O-(beta-D-glucuronopyranosyl-(1-->2)-alpha-D- arabinopyranosyl-32-nor-24-methyllanost-8(9)-ene-30-oic acid, were isolated from an Ulosa sp. sponge. Their structures were determined by spectral methods and chemical transformations. Specific features of their structures are discussed.
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Affiliation(s)
- A S Antonov
- Pacific Institute of Bioorganic Chemistry, Far Eastern Division, Russian Academy of Sciences, pr. Stoletiya Vladivostoka 159, Vladivostok, 690022 Russia
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Sharma GD, Nguyen HT, Antonov AS, Gerrity RG, von Geldern T, Pandey KN. Expression of atrial natriuretic peptide receptor-A antagonizes the mitogen-activated protein kinases (Erk2 and P38MAPK) in cultured human vascular smooth muscle cells. Mol Cell Biochem 2002; 233:165-73. [PMID: 12083372 DOI: 10.1023/a:1015882302796] [Citation(s) in RCA: 37] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
To understand the signaling mechanisms of atrial natriuretic peptide (ANP) receptor-A (NPRA), we studied the effect of the ANP/NPRA system on mitogen-activated protein kinases (MAPKs), with particular emphasis on the extracellular-regulated kinase (Erk2) and stress-activated protein kinase (p38MAPK) in cultured human vascular smooth muscle cells (HVSMC). Angiotensin II (ANG II) and platelet-derived growth factor (PDGF) stimulated the immunoreactive Erk2 and p38MAPK activities and their protein levels by 2-4 fold. The pretreatment of cells with ANP significantly inhibited the agonist-stimulated Erk2 and p38MAPK activities and protein expression by 65-75% in HVSMC transiently transfected with NPRA, as compared with only 18-22% inhibition in vector-transfected cells. The pretreatment of cells with KT5823, an inhibitor of cGMP-dependent protein kinase (PKG), reversed the inhibitory effects of ANP on MAPK activities and protein expression by 90-95%. PD98059, which inhibits Erk2 by directly inhibiting the MAPK-kinase (MEK), and SB202192, a selective antagonist of p38MAPK, blocked the Erk2 and p38MAPK activities, respectively. Interestingly, ANP stimulated the MAPK-phosphatase-3 (MKP-3) protein levels by more than 3-fold in HVSMC over-expressing NPRA, suggesting that ANP-dependent inhibition of MAPKs may also proceed by stimulating the phosphatase cascade. These present findings provide the evidence that ANP exerts inhibitory effects on agonist-stimulated MAPKs (Erk2 and p38MAPK) activities and protein levels in a 2-fold manner: by antagonizing the up-stream signaling pathways and by activation of MKP-3 to counter-regulate MAPKs in a cGMP and PKG-dependent manner. Our results identify a signal transduction pathway in HVSMC that could contribute to vascular remodeling and structural changes in human hypertension.
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Affiliation(s)
- Guru Dutt Sharma
- Department of Physiology, Tulane University Health Sciences Center, and School of Medicine New Orleans, LA 70112, USA
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Avilov SA, Antonov AS, Drozdova OA, Kalinin VI, Kalinovsky AI, Riguera R, Lenis LA, Jiménez C. Triterpene glycosides from the far eastern sea cucumber Pentamera calcigera II: disulfated glycosides. J Nat Prod 2000; 63:1349-1355. [PMID: 11076550 DOI: 10.1021/np000002x] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Three new triterpene glycosides, calcigerosides D(1) (1), D(2) (2), and E (3), have been isolated from the sea cucumber Pentamera calcigera. Their structures have been deduced from extensive spectral analysis (NMR and MS) and chemical evidence. All the compounds are disulfated pentaosides differing in aglycon structure and position of sulfate group, which were determined by the measurement of NT(1) values in the cases of glycosides 1 and 2. Glycoside 1 is a nonholostane derivative, that is, it lacks an 18(20)-lactone, which is very rare among the sea cucumber glycosides.
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Affiliation(s)
- S A Avilov
- Pacific Institute of Bioorganic Chemistry, the Far Eastern Division of the Russian Academy of Sciences, 690022, Vladivostok, Russian Federation.
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Avilov SA, Antonov AS, Drozdova OA, Kalinin VI, Kalinovsky AI, Stonik VA, Riguera R, Lenis LA, Jiménez C. Triterpene glycosides from the Far-Eastern sea cucumber Pentamera calcigera. 1. Monosulfated glycosides and cytotoxicity of their unsulfated derivatives. J Nat Prod 2000; 63:65-71. [PMID: 10650081 DOI: 10.1021/np9903447] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Three new monosulfated triterpene glycosides, calcigerosides B (2), C(1) (3), and C(2) (4), along with the known cucumarioside G(2) (1), have been isolated from the sea cucumber Pentamera calcigera. Their structures have been deduced from extensive spectral analysis (NMR and MS) and chemical evidence. Compounds 2-4 present a novel pentasacharide chain never reported before in sea cucumber triterpene glycosides. The desulfated derivatives of calcigerosides B, C(1), and C(2) (5, 7, and 9, respectively) showed moderate cytotoxicity (IC(50) = 5 microg/mL) against a selection of four human and mouse tumor cell lines.
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Affiliation(s)
- S A Avilov
- Pacific Institute of Bioorganic Chemistry, the Far Eastern Division of the Russian Academy of Sciences, 690022, Vladivostok, Russian Federation.
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Samigullin TK, Martin WF, Troitsky AV, Antonov AS. Molecular data from the chloroplast rpoC1 gene suggest a deep and distinct dichotomy of contemporary spermatophytes into two monophyla: gymnosperms (including Gnetales) and angiosperms. J Mol Evol 1999; 49:310-5. [PMID: 10473771 DOI: 10.1007/pl00006553] [Citation(s) in RCA: 39] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Partial sequences of the rpoC1 gene from two species of angiosperms and three species of gymnosperms (8330 base pairs) were determined and compared. The data obtained support the hypothesis that angiosperms and gymnosperms are monophyletic and none of the recent groups of the latter is sister to angiosperms.
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Affiliation(s)
- T K Samigullin
- A.N. Belozersky Institute of Physicochemical Biology, Moscow State University, Moscow 119899, Russia.
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Antonov AS, Kalinovsky AI, Stonik VA. Ulososide B, a new unusual norlanostane-triterpene glycoside and its genuine aglycone from the Madagascar sponge Ulosa sp. Tetrahedron Lett 1998. [DOI: 10.1016/s0040-4039(98)00589-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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