Preparation of 1,3,4-oxadiazoles and 1,3,4-thiadiazoles via chemoselective сyclocondensation of electrophilically activated nitroalkanes to (thio)semicarbazides or thiohydrazides
作者:Nicolai A. Aksenov、Nikolai A. Arutiunov、Nikita K. Kirillov、Dmitrii A. Aksenov、Alexander V. Aksenov、Michael Rubin
DOI:10.1007/s10593-020-02775-5
日期:2020.8
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.
已经发现在多磷酸存在下经由硝基链烷的亲电活化进行的异常反应。随后用氨基脲或硫代氨基脲的亲核攻击使得可以分别接近2-氨基-1,3,4-恶二唑和2-氨基-1,3,4-噻二唑。