Synthesis of 4-Aroyl-5-arylpyrazoles and 4-Aroyl-3-arylpyrazoles via the Reaction of Enaminodiketones with Substituted Hydrazines
作者:Tominari Choshi、Rika Kotouge、Takashi Nishiyama、Kanako Ono、Noriyuki Hatae、Satoshi Hibino
DOI:10.3987/com-19-14096
日期:——
symmetrical enaminodiketones 8–14 with substituted hydrazines. When using alkylhydrazines, if the substituent size of the alkyl group is small, it is possible to selectively synthesize 1-substituted 4-aroyl-5arylpyrazoles and their regioisomers, 1-substituted 4-aroyl-3-arylpyrazoles, by choosing the solvent (EtOH or toluene). When they react with bulky substituted hydrazines (e.g., cyclohexyl, phenyl, or pyridyl)
吡唑是一种五元杂环化合物,是医学和药理学领域重要的杂环化合物之一。在这里,我们展示了对称烯氨基二酮 8-14 与取代肼的反应性。使用烷基肼时,如果烷基的取代基尺寸较小,则可以通过选择溶剂(EtOH或甲苯)。当它们与大体积取代的肼(例如环己基、苯基或吡啶基)反应时,仅选择性地获得1-取代的4-芳酰基5-芳基吡唑。