Synthesis and structure of new 3-pyrazolinylcoumarins and 3-pyrazolinyl-2-quinolones
作者:V. F. Traven、A. V. Manaev、I. V. Voevodina、I. N. Okhrimenko
DOI:10.1007/s11172-008-0195-4
日期:2008.7
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。