A Spin-Labeled Derivative of Gossypol

A Spin-Labeled Derivative of Gossypol Full article

Journal

Molecules
ISSN: 1420-3049

Output data

Year: 2024, Volume: 29, Number: 20, Article number : 4966, Pages count : DOI: 10.3390/molecules29204966

Authors

Stepanov Andrey V. ¹ , Yarovenko Vladimir N. ¹ , Nasyrova Darina I. ¹ , Dezhenkova Lyubov G. ² , Akchurin Igor O. ^3,2 , Krayushkin Mickhail M. ¹ , Ilyushenkova Valentina V. ¹ , Shchekotikhin Andrey E. ² , Tretyakov Evgeny V. ¹

Affiliations

1	N.D. Zelinsky Institute of Organic Chemistry, Leninsky Ave. 47, Moscow 119991, Russia
2	Gause Institute of New Antibiotics, Bolshaya Pirogovskaya St. 11, Moscow 119021, Russia
3	D. Mendeleev University of Chemical Technology of Russia, Miusskaya Sq. 9, Moscow 125047, Russia

Gossypol and its derivatives arouse interest due to their broad spectrum of biological activities. Despite its wide potential application, there is no reported example of gossypol derivatives bearing stable radical functional groups. The first gossypol nitroxide hybrid compound was prepared here via formation of a Schiff base. By this approach, synthesis of a gossypol nitroxide conjugate was performed by condensation of gossypol with a 4-amino-TEMPO (4-amino-2,2,6,6-tetramethylpiperidin-1-oxyl) free radical, which afforded the target product in high yield. Its structure was proven by a combination of NMR and EPR spectroscopy, infrared spectroscopy, mass spectrometry, and high-resolution mass spectrometry. In addition, the structure of the gossypol nitroxide was determined by single-crystal X-ray diffraction measurements. In crystals, the paramagnetic Schiff base exists in an enamine–enamine tautomeric form. The tautomer is strongly stabilized by the intra- and intermolecular hydrogen bonds promoted by the resonance of π-electrons in the aromatic system. NMR analyses of the gossypol derivative proved that in solutions, the enamine–enamine tautomeric form prevailed. The gossypol nitroxide at micromolar concentrations suppressed the growth of tumor cells; however, compared to gossypol, the cytotoxicity of the obtained conjugate was substantially lower.

Stepanov A.V. , Yarovenko V.N. , Nasyrova D.I. , Dezhenkova L.G. , Akchurin I.O. , Krayushkin M.M. , Ilyushenkova V.V. , Shchekotikhin A.E. , Tretyakov E.V.
A Spin-Labeled Derivative of Gossypol
Molecules. 2024. V.29. N20. 4966 . DOI: 10.3390/molecules29204966 Scopus OpenAlex

Scopus:	2-s2.0-85207669897
OpenAlex:	W4403603207

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