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2021-01-14 15:41:00

A convenient method for the functionalization of important nitrogen-containing heterocycles was developed in ZIOC RAS

Nitrogen heterocycles are one of the most valuable scaffolds in organic chemistry for the production of various drugs. Heterocyclic structures are also of interest in the development of new functional materials and agrochemicals. Among nitrogen heterocycles, 1,2,5-oxadiazoles (furazans) and their N-oxides (furoxans) occupy a special place due to their great potential for application in various fields: they exhibit various pharmacological activities and are also of interest as parts of organic solar cells. Despite such prospects for the use of 1,2,5-oxadiazoles, methods of their chemoselective functionalization are practically not presented in the literature.

Researchers from laboratory № 19 of the Zelinsky Institute succeeded in developing a direct one-pot approach to the functionalization of readily available aminofurazans and aminofuroxans through a cascade of diazotization / reduction / condensation reactions. As a result, a wide range of N-(1,2,5-oxadiazolyl) hydrazones was obtained in high yields under mild conditions. The unusual hydrolytic stability of the synthesized compounds, along with their isosterism with respect to promising drug candidates for the treatment of various parasitic diseases, such as leishmaniasis, schistosomiasis, and Chagas disease, makes possible their potential use in medicinal chemistry.



Dmitry M. Bystrov, Ivan V. Ananyev, Leonid L. Fershtat, and Nina N. Makhova Direct Synthesis of N-(1,2,5-Oxadiazolyl)hydrazones through a Diazotization/Reduction/Condensation Cascade J. Org. Chem. 2020, 85, 23, 15466–15475. DOI: 10.1021/acs.joc.0c02243.

Important events:

The European Academy of Sciences (Academia Europaea) was founded in 1988. It unites about four thousand globally acknowledged experts in mathematics, medicine, natural sciences, humanities, law, economy, and social and political sciences from many countries of Europe. Among its members are also European scientists who live in other regions of the world. Currently, it includes seventy two Nobel laureates and it should be highlighted that many of them were elected to the Academy before winning the Prize.
Prof Mario Pagliaro (Palermo Italy) gave two talks on June 8th and 9th.
Alexey Sukhorukov, N. D. Zelinsky Institute of Organic Chemistry, Moscow, Russia, and colleagues studied the selective reactions of in-situ generated metal azides on N,N-bis(oxy)enamines. By combining readily generated bis(oxy)enamine substrates with sodium azide and one of a variety of metal salts (including Mg, Cu, Zn, Co, and Ni), the researchers showed that the metal cation selectively alters the mechanism to favor the formation of specific organoazide products.
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