2-Amino-4-(4-bromo­phen­yl)-6-meth­oxy-4H-benzo[h]chromene-3-carbonitrile

In the title compound, C₂₁H₁₅BrN₂O₂, the 14 non-H atoms of the 4H-benzo[h]chromene fused-ring system are approximately coplanar (r.m.s. deviation = 0.129 Å). Within this system, the 4H-pyran ring adopts a flattened half-chair conformation with the methine C atom lying 0.281 (4) Å above the plane of the remaining atoms (r.m.s. deviation = 0.0446 Å). The bromo­benzene ring is almost perpendicular to the fused-ring system [dihedral angle = 85.34 (13)°]. In the crystal, supra­molecular layers parallel to (101) are sustained by amine–cyano N—H...N and amine–meth­oxy N—H...O hydrogen bonds. The layers stack with inter­actions of the type (bromo­benzene)C—H...π(outer-C₆ ring of the fused-ring system) connecting them.

N′-[3-Cyano-4-(4-fluoro­phen­yl)-6-meth­oxy-4H-benzo[h]chromen-2-yl]-N,N-dimethyl­methanimidamide

In the title compound, C₂₄H₂₀FN₃O₂, despite the 4H-pyran ring having a flattened half-chair conformation [the methine C atom lies 0.257 (3) Å above the plane of the remaining atoms with an r.m.s. deviation of 0.0295 Å], the 14 non-H atoms of the 4H-benzo[h]chromene residue are approximately coplanar (r.m.s. deviation = 0.081 Å). The benzene ring is nearly perpendicular to this plane [dihedral angle = 76.18 (10)°], but the planar (r.m.s. deviation = 0.033 Å) dimethyl­methanimidamide substituent is coplanar [dihedral angle = 1.96 (12)°]. In the crystal, centrosymmetric dimeric aggregates arise from C—H...N inter­actions, and these are connected into supra­molecular layers in the ab plane by C—H...π and π–π [inter­centroid (central C₆ ring)...(outer C₆ ring)ⁱ distance = 3.8564 (14) Å] inter­actions.