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

摘要

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—H⋯O 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—H⋯O and N—H⋯O hydrogen bonds.