作者:G. V. Boyd、S. R. Dando
DOI:10.1039/p19720000777
日期:——
1,3,4-Oxadiazolium salts 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
1,3,4- Oxadiazolium盐用2-甲基-和反应2-苯基Δ 2 -oxazolin -5-酮,得到Ñ '-acylhydrazinomethylene-Δ 2 -oxazolin -5-酮(4),其被转换成1,5-二取代的4-酰基氨基-3-羟基吡唑(5),用酸或碱处理。加热4- [1-(Ñ '-benzoyl- Ñ -phenylhydrazino)亚乙基] -2-苯基- Δ 2 -oxazolin -5-酮(4a)中与烷基胺的产率4- [1-(烷基氨基)亚乙基〕-2-苯基-Δ 2 -oxazolin -5-酮(8)。