The action of Δ<sup>2</sup>-oxazolin-5-ones on 1,3,4-oxadiazolium salts
作者:G. V. Boyd、S. R. Dando
DOI:10.1039/p19720000777
日期:——
1,3,4-Oxadiazoliumsalts react with 2-methyl- and 2-phenyl-Δ2-oxazolin-5-one to give N′-acylhydrazinomethylene-Δ2-oxazolin-5-ones (4), which are converted into 1,5-disubstituted 4-acylamino-3-hydroxypyrazoles (5) on treatment with acid or alkali. Heating 4-[1-(N′-benzoyl-N-phenylhydrazino)ethylidene]-2-phenyl-Δ2-oxazolin-5-one (4a) with alkylamines yields 4-[1-(alkylamino)ethylidene]-2-phenyl-Δ2-oxazolin-5-ones