Crystal structure of methyl 3-(3-fluorophenyl)-1-methyl-1,3a,4,9b-tetrahydro-3H-thiochromeno[4,3-c]isoxazole-3a-carboxylate

In the title compound, C19H18FNO3S, the five-membered oxazolidine ring adopts an envelope conformation with the methine C atom of the fused bond as the flap. Its mean plane is oriented at a dihedral angle of 50.38 (1)degrees with respect to the fluorophenyl ring. The six-membered thiopyran ring has a half-chair conformation and its mean plane is almost coplanar with the fused benzene ring, making a dihedral angle of 4.94 (10)degrees. The two aromatic rings are inclined to one another by 85.96 (11)degrees, and the mean planes of the oxazolidine and thiopyran rings are inclined to one another by 57.64 (12)degrees. In the crystal, molecules are linked by C-H center dot center dot center dot pi interactions, forming a three-dimensional structure.