Methyl 2-{[(3-methyl-5-oxo-1-phenyl-4,5-dihydro-1H-pyrazol-4-ylidene)(thiophen-2-yl)methyl]amino}-3-phenylpropionate

Methyl 2-{[(3-methyl-5-oxo-1-phenyl-4,5-dihydro-1H-pyrazol-4-ylidene)(thiophen-2-yl)methyl]amino}-3-phenylpropionate

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In the title Ski de fond - Femme - Bottes - Skate compound, C25H23N3O3S, an intramolecular N—H.O interaction generates an S(6) ring, which stabilizes the enamine–keto form of the compound.This S(6) ring and the pyrazole ring are essentially coplanar, making a dihedral angle of 1.

49 (6)°.The bond lengths within the S(6) ring of the molecule lie between classical single- and double-bond lengths, Oversized Tee indicating extensive conjugation.The structure exhibits a thienyl-ring flip disorder, with occupancy factors in the ratio 64.

7 (3):35.3 (3).