Browsing by Author "Mazepa, Alexander V."

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Interaction of Labile N-Alkoxy-N-Chloro-N’-Arylureas and N-Acetoxy-Nalkoxyureas With Trimethyl Phosphite
(Oles Honchar Dnipro National University, Dnipro, 2025) Shtamburg, Vasiliy G.; Klots, Evgeniy A.; Anishchenko, Andrey A.; Shtamburg, Victor V.; Shishkina, Svitlana V.; Mazepa, Alexander V.; Kravchenko, Svetlana V.
ENG: The freshly synthesized N-alkoxy-N-chloro-N’-4-bromophenylureas undergo reaction with trimethyl phosphite in diethyl ether at room temperature yielding respectively dimethyl N-alkoxy-N-(N’-4- bromophenylcarbamoyl)phosphoroamidates with high yields. The unstable N-alkoxy-N-chloro-N’-phenylureas, freshly synthesized at -30°C, interact with trimethyl phosphite in diethyl ether at this low temperature to produce previously unknown dimethyl N-alkoxy-N-(N’-phenylcarbamoyl)phosphoroamidates. This reaction is the first example of the nucleofilic substitution at the nitrogen atom for unstable N-alkoxy-N-chloro-N’-phenylureas. Careful conditions selection and precise control made it possible to pevent premature destruction of the starting N-alkoxyN-chloro-N’-4-bromophenylureas and N-alkoxy-N-chloro-N’-phenylureas. In contrast, N-acetoxy-N-alkoxyureas do not react with trimethyl phosphite under the same conditions. The structures of the resulting dimethyl N-alkoxy-N- (N’-4-bromophenylcarbamoyl)phosphoroamidates and dimethyl N-alkoxy-N-(N’- phenylcarbamoyl)phosphoroamidates were confirmed by ¹H, ³¹P, and ¹³C NMR spectroscopy, as well as mass spectrometry. A comparative analysis of ¹H, ³¹P and ¹³C NMR spectra of these dimethyl N-alkoxy-N-(N’- arylcarbamoyl)phosphoroamidates with those of dialkyl N-alkoxy-N-(N’-4- nitrophenylcarbamoyl)phosphoroamidates revealed numerous shared features and general structural characteristics of N-alkoxy-N-(N’-arylcarbamoyl)phosphoroamidates
Interaction of N-Alkoxy-N-Chloro-N’-Arylureas With Trialkyl Phosphites AS a Route to Dialkyl N-Alkoxy-N-(N’’- Arylcarbamoyl) Phosphoramidates. Synthesis
(Ukrainian State University of Science and Technologies, Dnipro, 2025) Shtamburg, Vasiliy G.; Klots, Evgeniy A.; Anishchenko, Andrey A.; Shishkina, Svitlana V.; Mazepa, Alexander V.; Kravchenko S. V.
ENG: This article is dedicated to the study of the interaction of some kinds of N-alkoxy-Nchloroureas, such as N-alkoxy-N-chloro-N’-(4-nitrophenyl)ureas, N-ethoxy-N-chloroN’-(2-nitrophenyl)urea, N-methoxy-N-chloro-N’-(4-chlorophenyl)urea, and N-alkoxyN-chloro-N’-alkylureas, with trialkyl phosphites. The stable N-alkoxy-N-chloro-N’-(4- nitrophenyl)ureas interact with trialkyl phosphites in diethyl ether at room temperature with preferential formation of dialkyl N-alkoxy-N-(N’-4- nitrophenylcarbamoyl)phosphoramidates. N-Ethoxy-N-chloro-N’-(2-nitrophenyl)urea reacts with trimethyl phosphite in diethyl ether at room temperature giving dimethyl Nethoxy-N-(N’-2-nitrophenylcarbamoyl)phosphoramidate. The interaction of unstable Nmethoxy-N-chloro-N’-(4-chlorophenyl)urea with trialkyl phosphites in diethyl ether gives dialkyl N-methoxy-N-(N’-4-chlorophenylcarbamoyl)phosphoramidates with good yields. N-Alkoxy-N-chloro-N’-alkylureas react with trimethyl phosphite under the same conditions with selective formation of dimethyl N-alkoxy-N-(N’-alkylcarbamoyl)phosphoramidates with excellent yields. In all these cases, the nucleophilic substitution at the nitrogen atom is accompanied by a further Michaelis-Arbuzov rearrangement. The original method of creating molecules containing a P–N bond is proposed. The structures of dialkyl Nalkoxy-N-(N’-arylcarbamoyl)phosphoramidates and dimethyl N-alkoxy-N-(N’- alkylcarbamoyl)phosphoramidates have been confirmed by 1H, 31P, and 13C NMR spectroscopy, and mass spectrometry. The synthesized dialkyl N-alkoxy-N-(N’- arylcarbamoyl)phosphoramidates and dimethyl N-alkoxy-N-(N’- arylcarbamoyl)phosphoramidates simultaneously possess structural features of both phosphoramidates and ureas, and may be regarded as potential biologically active substances.
Synthesis of N-Acyloxy-1-(Dimethoxyphosphoryloxy)Benzimidates from N-Acyloxy-N-Chlorobenzamides
(Oles Honchar Dnipro National University, Dnipro, 2025) Shtamburg, Vasiliy G.; Klots, Evgeniy A.; Shtamburg, Victor V.; Anishchenko, Andrey A.; Shishkina, Svitlana V.; Mazepa, Alexander V.; Kravchenko, Svetlana V.
ENG: Aim. The objective of this research was to investigate the potential interaction between N-acyloxy-N-chlorobenzamides and trialkyl phosphites, along with the characterization of the resulting products' structures. Methods. Employing techniques such as 1H, 31P and 13C NMR spectroscopy, mass spectrometry, and single crystal X-ray diffraction, we have proved that the reaction of N-acyloxy-N-chlorobenzamides with trimethyl phosphite in diethyl ether produces N-acyloxy-1-(dimethoxyphosphoryloxy)benzimidates. Our research demonstrates that the reaction between N-acyloxy-N-chlorobenzamides and trialkyl phosphites offers a novel approach to synthesize Z-N-acyloxy-1-(dialkoxyphosphoryloxy)benzimidates. This discovery unveils a significant chemical transformation of N-acyloxy-N-chlorobenzamides. The structure of N-acyloxy-1-(dimethoxyphosphoryloxy)benzimidates has been confirmed by 1H, 31P and 13C NMR spectroscopy, mass spectrometry, and XRD study. The study of the N-(4-nitrobenzoyloxy)-1-(dimethoxyphosphoryloxy)benzimidate structure has revealed that the N-(4-nitrobenzoyloxy)-1-(dimethoxyphosphoryloxy)benzimidate is the Z-isomer, with the dimethoxyphosphoryloxy moiety and the N-4-nitrobenzoyloxy group being cis-oriented to the N=C double bond. The ether moiety and the N=C double bond are coplanar, while the dimethoxyphosphoryl substituent is orthogonal to the plane of the N=C double bond. The interaction of N-acyloxy-N-chlorobenzamides with trimethyl phosphite has led to a new synthesis of Z-N-acyloxy-1-(dialkoxyphosphoryloxy)benzimidates. The new chemical properties of N-acyloxy-N-chlorobenzamides have been established. The X-ray study of Z-N-4-nitrobenzoyoxy-1-benzimidate has demonstrated the peculiarities of its structure. Notably, an intriguing phenomenon of nitrogen-to-oxygen migration of the dimethoxyphosphoryl group has been observed.