Author/Authors :
Lَpez-Cara، نويسنده , , Luisa C. and Encarnaciَn Camacho، نويسنده , , M. and Carriَn، نويسنده , , Marيa D. and Gallo، نويسنده , , Miguel A. and Espinosa، نويسنده , , Antonio and Entrena، نويسنده , , Antonio، نويسنده ,
Abstract :
In this letter we describe the unexpected aromatization that takes place during the N-alkylation reaction performed on several 3-(2-nitrobenzoyl)-4,5-dihydro-1H-pyrazole-5-carboxylic acid methyl esters, giving rise to a mixture of 1-alkyl-3-(2-nitrobenzoyl)-4,5-dihydro-1H-pyrazole-5-carboxylic acid methyl esters and 1-alkyl-3-(2-nitrobenzoyl)-1H-pyrazole-5-carboxylic acid methyl esters.
