Treatment of isatoic anhydrides with hydrazine hydrate gave 1, 2-bis-(o-aminobenzoyl)-hydrazines (IIa-c). The reaction of IIa, b with ethoxymethylenemalononitrile, ethyl ethoxymethylenecyanoacetate or triethyl orthoformate afforded new 3, 3'-bisquinazoline-4, 4'-diones (IIIa, b and IVa-d) in good yields. On the other hand, the reaction of IIa-c with polyphosphoric acid furnished 2, 5-diaryl-1, 3, 4-oxadiazole derivatives in high yields.
用
肼水合物处理异酸酐可以得到 1,2-双(邻
氨基苯甲酰基)
肼(IIa-c)。IIa 和 b 与
乙氧基亚甲基丙二腈、乙氧基亚甲基
氰基
乙酸乙酯或
原甲酸三乙酯反应,可以得到新的 3,3'-双
喹唑啉-4,4'-二酮(IIIa,b 和 IVa-d),收率很高。另一方面,IIa-c 与多
磷酸反应可以得到高产率的 2,5-二芳基-1,3,4-噁二唑衍
生物。