Studies of Acenaphthene Derivatives. XVII. The Reaction of Benzylideneacenaphthenone with Hydrazines
作者:Otohiko Tsuge、Ichiro Shinkai、Masashi Tashiro
DOI:10.1246/bcsj.42.185
日期:1969.1
The reactions of benzylideneacenaphthenones with hydrazines are reported. The reaction of benzylideneacenaphthenone with hydrazine hydrate in methanol at 40°C gave 1-hydroxy-2-hydrazinobenzylacenaphthylene, which was then cyclized to the 1-acetylpyrazoline by treating it with acetic anhydride. The hydrazino compound reacted with phenyl isocyanate to give the 1:2-adduct, which, when then treated with hydrochloric acid, suffered ring closure to the pyrazoline compound. Under severe conditions with hydrazine hydrate, however, the reductive cleavage reaction took place, giving the hydrazones of both acenaphthenone and benzaldehyde. Similar phenomena were also observed in the reaction with p-substituted benzylideneacenaphthenones. On the other hand, the reaction with phenylhydrazines in ethanol containing sulfuric acid afforded directly the expected pyrazolines, from which pyrazoles were then prepared by treating them with lead tetraacetate. Furthermore, the corresponding pyridazine was formed in the reaction of phenacylideneacenaphthenone with hydrazine hydrate, while the reaction with 2,4-dinitrophenyl-hydrazine gave the pyrazoline compound.
报告了苯亚甲基苊酮与肼的反应。亚苄基苊酮与水合肼在 40°C 的甲醇中反应生成 1-羟基-2-肼基苄基苊烯,然后用乙酸酐将其环化为 1-乙酰基吡唑啉。肼基化合物与异氰酸苯酯反应生成 1:2- 加合物,然后用盐酸处理,该加合物发生闭环生成吡唑啉化合物。然而,在水合肼的苛刻条件下,还原裂解反应发生了,生成了苊酮和苯甲醛的肼。在与对取代亚苄基苊酮的反应中也观察到了类似的现象。另一方面,在含硫酸的乙醇中与苯肼反应可直接得到预期的吡唑啉类化合物,然后用四乙酸铅处理这些化合物可制备吡唑。此外,苯亚甲基苊酮与水合肼反应生成了相应的哒嗪,而与 2,4-二硝基苯肼反应则生成了吡唑啉化合物。