Acta Cryst. (2009). E65, o2993  [ doi:10.1107/S1600536809045449 ]

Ethyl 2-isopropylamino-5-methyl-4-oxo-3-phenyl-3,4-dihydrothieno[2,3-d]pyrimidine-6-carboxylate

A.-H. Zheng, L.-Y. Huang, E. Chen and H. Luo

Abstract: The title compound, C₁₉H₂₁N₃O₃S, was synthesized via an aza-Wittig reaction of a functionalized iminophosphorane with phenyl isocyanate under mild conditions. In the molecule, the fused thienopyrimidine ring system makes a dihedral angle of 66.30 (11)° with the phenyl ring. An intramolecular C-HO hydrogen bond occurs. The terminal -OCH₂CH₃ group is disordered over two sites with refined occupancies of 0.537 (13) and 0.463 (13). The crystal packing is stabilized by intermolecular C-HO and N-HO hydrogen bonds.

Online 4 November 2009

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