Furan-2,3-diones 1a-c react with various hydrazines 2a-c under different conditions to yield the pyrazole-3-carboxylic acid-hydrazide 3a-d. Cyclocondensation reactions of 1a or 7 with phenylhydrazine lead to derivatives of pyrazolo[3,4-d]pyridazinones 6 and 8, respectively. The structures of all products were confirmed by elemental analysis, IR, 1H- and 13C-NMR spectroscopic measurements.
呋喃-2,3-二
酮1a-c在不同条件下与各种
肼2a -c反应,得到
吡唑-3-
羧酸-酰
肼3a-d。1a或7与
苯肼的环缩合反应分别生成
吡唑并[3,4- d ]
哒嗪酮6和8的衍
生物。所有产品的结构均通过元素分析,IR,1 H-和13 C-NMR光谱测定证实。