5-(1-Methyl-1-phenyl-ethylcarbamoyl)-3-(2-nitro-benzoylamino)-thieno[2,3-c]pyrazole-1-carboxylic Acid ethyl Ester → 3-(2-Amino-benzoylamino)-5-(1-methyl-1-phenyl-ethylcarbamoyl)-thieno[2,3-c]pyrazole-1-carboxylic Acid ethyl Ester

Participants

Reaction Steps

The suspension of 1.8 g (3.451 mmol) of 5-(1-Methyl-1-phenyl-ethylcarbamoyl)-3-(2-nitro-benzoylamino)-thieno[2,3-c]pyrazole-1-carboxylic acid ethyl ester and 500 mg of Pd/C (10%) in 45 mL of ethylacetate was shaken under hydrogen pressure (40 psi). The catalyst was renewed (500 mg) after 8 hours and the mixture treated for further 8 hours. The catalyst was then filtered over a celite pad and the solvent removed under vacuum. The crude was purified on silica gel (eluant dichloromethane-methanol 98:2) yielding 1.44 g (85%) of the title compound.

Provenance & Evidence