title: Ethyl 2-isopropyl-amino-5-methyl-4-oxo-3-phenyl-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 an aza-Wittig reaction of a functionalized imino-phospho-rane with phenyl isocyanate under mild conditions. In the mol-ecule, the fused thienopyrimidine ring system makes a dihedral angle of 66.30 (11)° with the phenyl ring. An intra-molecular C-H⋯O hydrogen bond occurs. The terminal -OCH(2)CH(3) group is disordered over two sites with refined occupancies of 0.537 (13) and 0.463 (13). The crystal packing is stabilized by inter-molecular C-H⋯O and N-H⋯O hydrogen bonds.
authors.forename: Ai-Hua
authors.initials: AH
authors.lastname: Zheng
authors.forename: Liang-Yong
authors.initials: LY
authors.lastname: Huang
authors.forename: E
authors.initials: E
authors.lastname: Chen
authors.forename: Hong
authors.initials: H
authors.lastname: Luo