A simple and efficient synthesis of some important pyrazole derivatives

The 1h-pyrazole-3-carboxylic acid was converted via reactions of its acid chloride 1a,b with amino acid,thiol and various amine derivatives into the corresponding amino acid ester derivatives 2a-d,4-aroyl-1,5-diaryl-1h-pyrazol-3-carbotioates 3a-d,and pyrazole-3-carboxamides 6,7 respectively,in good yields (35-85%). the structures of all new synthesized compounds were established by the 13c nmr,1h nmr,ir spectroscopic data and elemental analyses.