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Matamoros E, Cintas P, Palacios JC. Tautomerism and stereodynamics in Schiff bases from gossypol and hemigossypol with N-aminoheterocycles. Org Biomol Chem 2019; 17:6229-6250. [DOI: 10.1039/c9ob01011d] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Gossypol, a natural male contraceptive, can be functionalized via dynamic imine linkages, whose tautomerism has been explored in detail.
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Affiliation(s)
- Esther Matamoros
- Departamento de Química Orgánica e Inorgánica
- Facultad de Ciencias
- and IACYS-Unidad de Química Verde y Desarrollo Sostenible
- Universidad de Extremadura
- 06006 Badajoz
| | - Pedro Cintas
- Departamento de Química Orgánica e Inorgánica
- Facultad de Ciencias
- and IACYS-Unidad de Química Verde y Desarrollo Sostenible
- Universidad de Extremadura
- 06006 Badajoz
| | - Juan Carlos Palacios
- Departamento de Química Orgánica e Inorgánica
- Facultad de Ciencias
- and IACYS-Unidad de Química Verde y Desarrollo Sostenible
- Universidad de Extremadura
- 06006 Badajoz
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Przybylski P, Kira J, Schroeder G, Brzezinski B, Bartl F. Molecular Structures and Stability Constants of Gossypol and Its Aza-Derivative Complexes with Silver(I) Cations Studied by Potentiometric, ESI MS, NMR, and AM1d Semiempirical Methods. J Phys Chem A 2008; 112:8061-9. [DOI: 10.1021/jp8043434] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Piotr Przybylski
- Faculty of Chemistry, Adam Mickiewicz University, 60-780 Poznań, Grunwaldzka 6, Poland, and Faculty of Chemistry, University of Gdansk, Sobieskiego 18, 80-952 Gdańsk, Poland, and Institute of Medical Physics and Biophysics Charité—Universitätsmedizin Berlin Campus Charité Mitte, Ziegelstr. 5/9, 10117 Berlin, Germany
| | - Jaromir Kira
- Faculty of Chemistry, Adam Mickiewicz University, 60-780 Poznań, Grunwaldzka 6, Poland, and Faculty of Chemistry, University of Gdansk, Sobieskiego 18, 80-952 Gdańsk, Poland, and Institute of Medical Physics and Biophysics Charité—Universitätsmedizin Berlin Campus Charité Mitte, Ziegelstr. 5/9, 10117 Berlin, Germany
| | - Grzegorz Schroeder
- Faculty of Chemistry, Adam Mickiewicz University, 60-780 Poznań, Grunwaldzka 6, Poland, and Faculty of Chemistry, University of Gdansk, Sobieskiego 18, 80-952 Gdańsk, Poland, and Institute of Medical Physics and Biophysics Charité—Universitätsmedizin Berlin Campus Charité Mitte, Ziegelstr. 5/9, 10117 Berlin, Germany
| | - Bogumił Brzezinski
- Faculty of Chemistry, Adam Mickiewicz University, 60-780 Poznań, Grunwaldzka 6, Poland, and Faculty of Chemistry, University of Gdansk, Sobieskiego 18, 80-952 Gdańsk, Poland, and Institute of Medical Physics and Biophysics Charité—Universitätsmedizin Berlin Campus Charité Mitte, Ziegelstr. 5/9, 10117 Berlin, Germany
| | - Franz Bartl
- Faculty of Chemistry, Adam Mickiewicz University, 60-780 Poznań, Grunwaldzka 6, Poland, and Faculty of Chemistry, University of Gdansk, Sobieskiego 18, 80-952 Gdańsk, Poland, and Institute of Medical Physics and Biophysics Charité—Universitätsmedizin Berlin Campus Charité Mitte, Ziegelstr. 5/9, 10117 Berlin, Germany
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Przybylski P, Schilf W, Kamienski B, Brzezinski B, Bartl F. CP/MAS spectroscopy in the determination of the tautomeric forms of gossypol, its Schiff bases and hydrazones in the solid state. MAGNETIC RESONANCE IN CHEMISTRY : MRC 2008; 46:534-544. [PMID: 18338327 DOI: 10.1002/mrc.2210] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
New Schiff bases and new hydrazones were synthesized and studied by (13)C and (15)N CP/MAS spectroscopy and by (1)H--(1)H COSY, (1)H--(13)C HMBC, (1)H--(13)C HSQC, (1)H--(15)N HMQC and (1)H--(15)N HSQC correlations. The CP/MAS investigation of gossypol has demonstrated that in the solid state it exists exclusively in the aldehyde-aldehyde tautomeric form. In contrast, CP/MAS studies of hydrazones and Schiff bases reveal that these compounds occur in the solid state in the N-imine-N-imine and enamine-enamine tautomeric forms, respectively. It is shown that the (13)C resonances of C-6, C-7 and C-11 carbon atoms are suitable for distinguishing between the tautomeric forms of aza-derivatives of gossypol in the solid state. Furthermore, we have proved that the (15)N CP/MAS spectra can be used to identify these tautomeric forms.
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Affiliation(s)
- Piotr Przybylski
- Faculty of Chemistry, A. Mickiewicz University, Grunwaldzka 6, 60-780 Poznan, Poland.
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Przybylski P, Bejcar G, Schilf W, Brzezinski B. Structural and semiempirical investigation of hydrazone of gossypol and its protonated species. J Mol Struct 2008. [DOI: 10.1016/j.molstruc.2006.12.041] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Przybylski P, Gierczyk B, Schroeder G, Zundel G, Brzezinski B, Bartl F. Spectroscopic and PM5 semiempirical studies of the proton accepting properties of 1,8-bis(tetramethylguanidino)naphthalene. J Mol Struct 2007. [DOI: 10.1016/j.molstruc.2007.03.029] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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Przybylski P, Bejcar G, Schilf W, Kamieński B, Brzezinski B. 13C, 15N CP-MAS as well as FT-IR studies of gossypol derivatives with aromatic substituents in solid. J Mol Struct 2007. [DOI: 10.1016/j.molstruc.2006.04.042] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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