Methyl 2-({6-[(1-meth­oxy-2-methyl-1-oxopropan-2-yl)carbamo­yl]pyridin-2-yl}formamido)-2-methyl­propano­ate

In the title compound, C₁₇H₂₃N₃O₆, the two meth­oxy­carbonyl C—O—C=O planes are inclined at dihedral angles of 5.3 (4) and 83.9 (4)° with respect to the central pyridine ring. An intra­molecular N—H...O hydrogen bond generates an S(5) ring motif. In the crystal, mol­ecules are linked into a chain along the c axis via C—H...O hydrogen bonds.

Ethyl 2-amino-4-(4-fluoro­phen­yl)-6-meth­oxy-4H-benzo[h]chromene-3-carboxyl­ate

In the title compound, C₂₃H₂₀FNO₄, the fluoro-substituted benzene ring is approximately perpendicular to the mean plane of the 4H-benzo[h]chromene ring system [maximum deviation = 0.264 (1) Å], with a dihedral angle of 83.79 (6)°. The pyran ring adopts a flattened boat conformation. The meth­oxy group is slightly twisted from the attached benzene ring of the 4H-benzo[h]chromene moiety [C—O—C—C = −2.1 (2)°]. An intra­molecular N—H...O hydrogen bond generates an S(6) ring motif. In the crystal, mol­ecules are linked by N—H...O and N—H...F hydrogen bonds into a layer parallel to the bc plane. The crystal packing also features C—H...π inter­actions.

Methyl 2-{6-[(1-meth­oxy-1-oxopropan-2-yl)amino­carbon­yl]pyridine-2-carboxamido}­propano­ate

In the title compound, C₁₅H₁₉N₃O₆, the amide planes are inclined at dihedral angles of 0.8 (6) and 12.1 (3)° with respect to the central pyridine ring. The mean planes of the corresponding methyl acetate groups form dihedral angles of 41.76 (13) and 86.48 (15)°, respectively with the mean plane of pyridine ring. A pair of weak intra­molecular N—H...N hydrogen bonds generate an S(5)S(5) ring motif in the mol­ecule. In the crystal, mol­ecules are linked by N—H...O hydrogen bonds into [001] chains. The chains are cross-linked by C—H...O hydrogen bonds into layers lying parallel to bc plane. The crystal packing also features a C—H...π inter­action.

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

In the title mol­ecule, C₂₁H₁₅FN₂O₂, the dihedral angle between the fluoro-substituted benzene ring and the mean plane of the 4H-benzo[h]chromene ring system [maximum deviation = 0.109 (2) Å] is 83.35 (7)°. The pyran ring adopts a slight sofa conformation with the tertiary C(H) atom forming the flap. The meth­oxy group is slightly twisted from the attached benzene ring of the 4H-benzo[h]chromene moiety [C—O—C—C = −4.3 (3)°]. In the crystal, mol­ecules are linked by inter­molecular N—H...N hydrogen bonds into infinite wave-like chains along the b axis. The crystal packing is further stabilized by π–π inter­actions [centroid–centroid distance = 3.7713 (9) Å].