10′-Chloro-3′,4′-dihydro-2′H-spiro­[cyclo­propane-1,7′(6′H)-pyrimido[2,1-a]isoquinolin]-6′-one

In the title compound, C₁₄H₁₃ClN₂O, the fused hydro­pyrimidine ring adopts an envelope conformation with one of the methyl­ene C atoms at the flap. The three-membered ring is approximately perpendicular to the attached isoquinoline ring system, with a dihedral angle of 89.44 (11)°. In the crystal, mol­ecules are linked by a weak C—H...π inter­action, forming a helical chain along the c axis.