2-Hydroxy-2-phenylazo-γ-butyrolactone 3a, prepared from oxidation
of phenylhydrazone 1a, either decomposes to form
α-keto-γ-butyrolactone 2a in 80% yield or rearranges to
tetrahydro-1,3-oxazine-2,4-dione derivative 4a in 95% yield under
different conditions.
由苯腙 1a 氧化制备的 2-羟基-2-苯基偶氮-δ
-丁内酯 3a 在不同条件下分解生成δ-酮-δ
-丁内酯 2a,收率为 80%,或者重新排列生成四氢-1,3-恶嗪-2,4-二酮衍
生物 4a,收率为 95%。