A number of isoxazolo[4,5-d]pyridazine derivatives have been prepared. Condensation of diethyl 3-phenylisoxazole-4,5-dicarboxylate with hydrazine hydrate gave 3-phenylisoxazolo[4,5-d]-pyridazin-4,7(5H,6H)-dione; from the latter several 4,7-disubstituted derivatives have been obtained through the dichloro compound. In addition several methylation products (mono- and di-, N- and O-methyl derivatives)
已经制备了许多
异恶唑并[4,5-d]
哒嗪衍
生物。
3-苯基异恶唑-4,5-二
羧酸二
乙酯与
水合
肼的缩合反应得到
3-苯基异恶唑[4,5-d]-
哒嗪-4,7(5H,6H)-二酮。从后者通过二
氯化合物获得了几种4,7-二取代的衍
生物。另外,已经描述了几种甲基化产物(单和二,N和O-甲基衍
生物)并研究了它们的结构。