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In the title mol-ecule, C23H18F2N2O3S, the 4-fluoro-substituted and 2-fluoro-substituted benzene rings form dihedral angles of 88.16 (8) and 23.1 (1)°, respectively, with the thia-zole ring. The pyrimidine ring adopts a flattened sofa conformation with the sp (3)-hydridized C atom forming the flap. In the crystal, pairs of weak C-H⋯O hydrogen bonds link mol-ecules related by twofold rotation axes, forming R (2) 2(10) rings, which are in turn linked by weak C-H⋯N inter-actions to form chains of rings along [010]. In addition, weak C-H⋯π(arene) inter-actions link the chains into layers parallel to (001) and π-π inter-actions with a centroid-centroid distance of 3.836 (10) Å connect these layers into a three-dimensional network.

acta crystallographica. section e

Crystal structure of ethyl 2-(2-fluorobenzylidene)-5-(4-fluorophenyl)-7-methyl-3-oxo-2,3-dihydro-5<i>H</i>-1,3-thiazolo[3,2-<i>a</i>]pyrimidine-6-carboxylate

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