Acta Cryst. (2009). E65, o1229  [ doi:10.1107/S1600536809016365 ]

Ethyl 4-(5-chloro-3-methyl-1-phenyl-1H-pyrazol-4-yl)-6-methyl-2-oxo-1,2,3,4-tetrahydropyrimidine-5-carboxylate

H.-K. Fun, C. S. Yeap, K. V. Sujith and B. Kalluraya

Abstract: In the title compound, C₁₈H₁₉ClN₄O₃, the dihydropyrimidinone ring adopts a flattened boat conformation. The dihedral angle between the phenyl and pyrazole rings is 43.39 (6)°. An intramolecular C-HO contact generates an S(8) ring motif that stabilizes the molecular conformation and precludes the carbonyl O atom of the ester group from forming intermolecular interactions. Molecules are linked into centrosymmetric dimers by pairs of N-HO hydrogen bonds and the dimers are linked into infinite chains along [101] by N-HN hydrogen bonds.

Online 7 May 2009

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