Preparation of substituted 1,2-Dihydro-3<i>H</i>-pyrazol-3-ones from polylithiated 2′-phenylphenylacetohydrazides and aromatic esters
作者:Jennifer R. Downs、Stefan J. Pastine、Jessica D. Townsend、Heather A. Greer、Wayne Kelley、Deborah A. Schady、Teresa Lentz Mcconaughy、Clyde R. Metz、Charles F. Beam、Catharine D. Almquist、William T. Pennington、Rosa D. Bailey Walsch
DOI:10.1002/jhet.5570380326
日期:2001.5
Several 2′-phenylphenylacetohydrazides were polylithiated with excess lithium diisopropylamide, and the resulting intermediates were condensed with several aromatic esters to afford C-acylated intermediates that were not usually isolated, but acid cyclized directly to 1,4,5-trisubstituted, 1,2-dihydro-3H-pyrazol-3-ones.
几种2'-苯基苯基乙酰肼用过量的二异丙基氨基锂多锂化,所得中间体与几种芳族酯缩合,得到C-酰化的中间体,通常不分离该酯,但将其酸环化成1,4,5-三取代的1,2 -二氢-3 H-吡唑-3-酮。