4-Cyano-N-ethylspiro[chromene-2,4′-piperidine]-1′-carboxamide

The title compound, C17H19N3O2, crystallizes with two independent molecules (A and B) in the asymmetric unit. In both molecules, the pyran ring has a twisted conformation (5S4), with Q = 0.301 (3) , θ = 116.7 (6) and = 213.6 (7)° for molecule A, and Q = 0.364 (2) , θ = 113.7 (3) and = 213.0 (4)° for molecule B. In molecule B, the terminal ethyl group is disordered over two orientations with an occupancy ratio of 0.55 (1):0.45 (1). In the crystal, molecules A and B form very similar but separate R12(7) motifs through N—H...O and C—H...O hydrogen bonds. The resulting chains along [001] are interlinked by weaker C—H...O and C—H...π interactions, forming layers parallel to the bc plane.