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In the title compound, C18H23N5O2, the triazolopyrimidine ring system is essentially planar, with a maximum displacement of 0.032 (2) Å, and forms a dihedral angle of 87.59 (15)° with the phenyl ring. In the crystal, molecules are linked by intermolecular C—H...O hydrogen bonds and C—H...π interactions into chains parallel to the c axis.

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.

In the title compound, C20H18N2O4, all non-H atoms of the three fused rings of the benzofuro[3,2-d]pyrimidine system are almost coplanar (r.m.s. deviation 0.021 Å). The dihedral angle between the fused ring system and the benzene ring is 1.47 (12)°. Intramolecular and intermolecular C—H...O hydrogen bonds together with weak C—H...π interactions stabilize the structure.

The title compound, C19H21N3O3S, was synthesized via the aza-Wittig reaction of functionalized iminophosphorane with phenyl isocyanate under mild conditions. In the molecule, 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 intramolecular C—H...O hydrogen bond is present. The crystal packing is stabilized by intermolecular N—H...O and C—H...O hydrogen bonds.

In the title compound, C10H11ClN4O2S, the triazole ring carries methyl and ethoxycarbonyl groups and is bound via a methylene bridge to a chlorothiazole unit. There is also evidence for significant electron delocalization in the triazolyl system. Intra- and intermolecular C—H...O hydrogen bonds together with strong π–π stacking interactions [centroid–centroid distance 3.620 (1) Å] stabilize the structure.

In the title compound, C14H16ClN5O3, there is evidence for significant electron delocalization in the triazolyl system. Intramolecular C—H...O and intermolecular C—H...O and C—H...N hydrogen bonds stabilize the structure.