Crystal structure of (2-hydroxy-5-methylphenyl)(3-methyl-1-phenyl-1H-pyrazolo[3,4-b]pyridin-5-yl)methanone

In the title compound, C21H17N3O2, the 2-hydroxy-5-methylphenyl ring and the phenyl ring are inclined to the mean plane of the pyrazolopyridine moiety (r.m.s. deviation = 0.013 Å) by 52.89 (9) and 19.63 (8)°, respectively, and to each other by 42.83 (11)°. In the molecule, there are intramolecular O—H...O and C—H...N hydrogen bonds, both enclosing an S(6) ring motif. In the crystal, molecules stack along the c-axis direction, forming columns within which there are a number of π–π interactions [the inter-centroid distances vary from 3.5278 (10) to 3.8625 (10) Å]. The columns are linked by C—H...π interactions, forming slabs parallel to (100)

5-(2-Hydroxy-5-methoxybenzoyl)-1-methyl-3-nitropyridin-2(1H)-one

In the title compound, C14H12N2O6, the dihedral angle between the benzene and pyridine rings is 65.90 (7)°. The nitro group is disordered and tilted with respect to the mean plane of the pyridine ring by 21.5 (4) and 22.8 (5)°, for the major and minor components, respectively. In the crystal, molecules are linked by O—H...N hydrogen bonds, forming chains propagating along [10-1]. The chains are linked by C—H...O hydrogen bonds, forming a three-dimensional framework. The crystal packing is further stabilized by offset π–π stacking interactions [intercentroid distance = 3.6291 (9) Å

Crystal structure of (5-chloro-2-hydroxyphenyl)(3-methylisoxazolo[5,4-b]pyridin-5-yl)methanone

In the title compound, C14H9ClN2O3, the fused pyridine and isoxazole rings are approximately planar, making a dihedral angle of 1.14 (16)°. The molecule is twisted with the benzene ring and the mean plane through the fused pyridine-isoxazole ring system being inclined to one another by 47.03 (13)°. There is an intramolecular O—H...O hydrogen bond forming an S(6) ring motif. In the crystal, molecules are linked by C—H...N hydrogen bonds, forming chains propagating along [001]. The chains are linked by slipped parallel π–π interactions, involving inversion-related benzene rings, forming slabs lying parallel to the bc plane {inter-centroid distance = 3.770 (2) Å]

5-(5-Chloro-2-hydroxybenzoyl)-1-methyl-3-nitropyridin-2(1H)-one

In the title compound, C13H9ClN2O5, the dihedral angle between the planes of the benzene and pyridine rings is 55.30 (13)°. The nitro group is tilted by 38.21 (10)° with respect to the mean plane of the pyridine ring. In the crystal, molecules are linked by O—H...O and C—H...O hydrogen bonds, forming a three-dimensional framework. The crystal packing is further stabilized by π–π stacking interactions [intercentroid distance = 3.5877 (17) Å]

5-(2-Hydroxybenzoyl)-2-(1H-indol-3-yl)pyridine-3-carbonitrile

In the title compound, C21H13N3O2, the indole and pyridine rings are planar. The pyridine ring is in an antiperiplanar (−ap) orientation with the indole ring system and an antiperiplanar (+ap) orientation with the hydroxyphenyl ring. An intramolecular O—H...O hydrogen bond stabilizes the molecular structure. In the crystal, N—H...N hydrogen bonds involving the indole NH group and the cyanide nitrogen atom lead to the formation of a two-dimensional supramolecular network lying parallel to (011)