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。