Crystal structure of ethyl 5-(3-fluorophenyl)-2-[(4-fluorophenyl) methylidene]7-methyl-3-oxo-2H,3H,5H-[1,3]thiazolo[3,2-a]pyrimidine-6-carboxylate

In the title molecule, C23H18F2N2O3S, the pyrimidine ring is in a half-chair conformation and the 3-fluorophenyl group is in the axial position. The thiazole ring (r.m.s. deviation = 0.0252 angstrom) forms dihedral angles of 84.8 (7) and 9.6 (7)degrees with the 3-fluoro-substituted and 4-fluoro-substituted benzene rings, respectively. In the crystal, weak C-H center dot center dot center dot F and C-H center dot center dot center dot O hydrogen bonds connect molecules, forming zigzag chains along the b axis. In addition pi-pi stacking interactions with a centroid-centroid distance of 3.7633 (9) angstrom connect these chains into ladders via inversion-related 4-fluorophenyl groups.