87650-52-0Relevant articles and documents
SYNTHESIS OF 1-ARYL-3-(3-PYRROLYL)-5-OXOPYRAZOLES
Zhestkov, V.P.,Voronin, V.G.,Portnov, Yu.N.
, p. 863 - 867 (2007/10/02)
1-Aryl-3-(2,4-dimethyl-5-ethoxycarbonyl-3-pyrrolyl)-5-oxopyrazoles were obtained by condensation of ethyl β-(2,4-dimethyl-5-ethoxycarbonyl-3-pyrrolyl)-β-ketopropionate with arylhydrazines.Electron-donor substituents in the aromatic ring of the arylhydrazines accelerate the cyclization of the intermediate hydrazones, whereas electron-acceptor substituents hinder cyclization.