Preparation of 1,3,4-oxadiazoles and 1,3,4-thiadiazoles via chemoselective сyclocondensation of electrophilically activated nitroalkanes to (thio)semicarbazides or thiohydrazides.

Autor: Aksenov, Nicolai A., Arutiunov, Nikolai A., Kirillov, Nikita K., Aksenov, Dmitrii A., Aksenov, Alexander V., Rubin, Michael
Předmět:
Zdroj: Chemistry of Heterocyclic Compounds; 2020, Vol. 56 Issue 8, p1067-1072, 6p
Abstrakt: Unusual reaction proceeding via the electrophilic activation of nitroalkanes in the presence of polyphosphoric acid has been discovered. Subsequent nucleophilic attack with semicarbazides or thiosemicarbazides allows to access 2-amino-1,3,4-oxadiazoles and 2-amino-1,3,4-thiadiazoles, respectively. [ABSTRACT FROM AUTHOR]
Databáze: Complementary Index
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