Crystal structure of 2-acetyl-5-(3-methoxyphenyl)-3,7-dimethyl-5H-1,3-thiazolo[3,2-a]pyrimidine-6-carboxylate

In the title molecule, C20H22N2O4S, the pyrimidine ring is in a flattened half-chair conformation and the 3-methoxyphenyl substituent is in an axial arrangement. The thiazole ring forms a dihedral angle of 81.3 (1)degrees with the benzene ring. In the crystal, weak C-H center dot center dot center dot S interactions link molecules into chains along [001]. In addition, there are pi-pi interactions between inversion-related thiazole rings with a centroid-centroid distance of 3.529 (2) angstrom. The ethyl group was refined as disordered over two sets of sites with an occupancy ratio of 0.52 (3):0.48 (2).