Preparation of 2-[1-Phenyl-1<i>H</i>-pyrazol-5-yl]benzoic Acids from Dilithiated<i>C</i>(α),<i>N</i>-Phenylhydrazones and Methyl Hydrogen Phthalate
作者:Anna C. Dawsey、John D. Knight、Charles F. Beam、N. Dwight Camper
DOI:10.1080/00397910802323049
日期:2008.11.3
Abstract Select C(α),N-phenylhydrazones were dilithiated with excess lithium diisopropylamide to their dianion-type intermediates followed by condensation with methyl hydrogen phthalate. The resulting C-acylated hydrazones were not isolated but acid cyclized directly to afford new substituted 2-(1-phenyl-1H-pyrazol-5-yl)benzoic acids.
摘要 选择 C(α),N-苯基腙用过量的二异丙基氨基锂二锂化为其二价阴离子型中间体,然后与邻苯二甲酸氢甲酯缩合。所得的 C-酰化腙未被分离,而是直接酸环化以提供新的取代的 2-(1-苯基-1H-吡唑-5-基)苯甲酸。