The reactions of substituted 3-cinnamoyl-4-hydroxycoumarins and 3-cinnamoyl-4-hydroxy-2-quinolones with different phenylhydrazines gave 3-hetaryl-1H-4,5-dihydropyrazoles. The product structures were studied by 1H NMR spectroscopy and mass spectrometry. 4-Hydroxy-3-pyrazo-linylcoumarins exist in DMSO as two tautomers (4-enol and chromane-2,4-dione), while 4-hydroxy-3-pyrazolinyl-2-quinolones exist only in the enol form.
替代的3-肉桂酰-
4-羟基
香豆素和3-肉桂酰-
4-羟基-2-
喹啉与不同的苯
肼反应生成了3-杂芳基-1H-4,5-
二氢吡唑。产品结构通过1H NMR光谱和质谱进行了研究。
4-羟基-3-
吡唑啉
香豆素在
DMSO中存在两种互变异构体(4-烯醇和色烯-2,4-二酮),而
4-羟基-3-
吡唑啉-2-
喹啉仅以烯醇形式存在。