Reaction of carbanions of β-diketones and β-keto esters with hydrazidic bromides
1973; Elsevier BV; Volume: 29; Issue: 1 Linguagem: Inglês
10.1016/s0040-4020(01)99385-8
ISSN1464-5416
AutoresAhmad S. Shawali, Hamdi M. Hassaneen,
Tópico(s)Chemical Synthesis and Analysis
ResumoThe carbanions of acetylacetone, dibenzoylmethane, ethyl acetoacetate and ethyl benzoylacetate react with hydrazidic bromides (2) in ethanol at room temperature to give substituted pyrazoles (3–6) respectively in good yields. The procedure appears to be a convenient and unequivocal method for preparing a particular pyrazole isomer. The structure assignments of the compounds prepared were based on elemental analyses and spectral and chemical evidence.
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