Ethyl 5-amino-1-[(4-methylphenyl)sulfonyl]-1H-pyrazole-4-carboxylate

Abstract

In the title molecule, C13H15N3O4S, the benzene and pyrazole rings are inclined to each other at 77.48 (3)°. Two amino H atoms are involved in bifurcated hydrogen bonds, viz. intramolecular N—H...O and intermolecular N—H...O(N). The intermolecular hydrogen bonds link the molecules related by translation in [100] into chains. A short distance of 3.680 (3) Å between the centroids of benzene and pyrazole rings from neighbouring molecules shows the presence of π–π interactions, which link the hydrogen-bonded chains into layers parallel to the ab plane.