title: Ethyl 5-methyl-4-oxo-3-phenyl-2-propyl-amino-3,4-dihydro-thieno[2,3-d]pyrimidine-6-carboxyl-ate.
abstract: The title compound, C(19)H(21)N(3)O(3)S, was synthesized via the aza-Wittig reaction of functionalized imino-phospho-rane with phenyl isocyanate under mild conditions. In the mol-ecule, the fused thienopyrimidine ring system is essentially planar, with a maximum deviation of 0.072 (2) Å, and makes a dihedral angle of 60.11 (9)° with the phenyl ring. An intra-molecular C-H⋯O hydrogen bond is present. The crystal packing is stabilized by inter-molecular N-H⋯O and C-H⋯O hydrogen bonds.
authors.forename: Ai-Hua
authors.initials: AH
authors.lastname: Zheng
authors.forename: Yan-Mei
authors.initials: YM
authors.lastname: Ren
authors.forename: Jing
authors.initials: J
authors.lastname: Xu