The most widely distributed substituted pyridine compounds in living systems are the pyridine nucleotides. The nicotinamide moiety (Fig. 1, I) of these compounds arises from the indole nucleus of tryptophan in animals, (1, 2) and Neurospora (3, 4), but not in higher plants (5-7) and certain bacteria (8). Pyridine compounds which might be used to study the biosynthesis of the pyridine nucleus ar...

In the title compound, C(32)H(32)N(2)O(3)S, the pyrrolidine ring adopts an envelope conformation with the methine C atom nearest to the phenyl ring as the flap atom. The tetra-hydro-pyridine ring has a half-chair conformation. The two rings are trans-fused. The phenyl ring bound to the tetra-hydro-pyridine is oriented almost perpendicular [dihedral angle = 86.35 (10)°] to the fused benzene ring...

YNU-5 zeolite has the YFI-type framework with a 12-12-8-ring system (2-dimensional 12-oxygen membered ring pores 3-dimensionally connected by twin 8-ring channels), and isolated channels separated from thin (mono-atomic silicate) wall. In this study, acidic property of was analyzed mainly means ammonia IRMS-TPD (infrared/mass spectroscopy temperature-programmed desorption) method. addition, acc...

Mn(III)-based oxidative free-radical cyclization of an unsaturated beta-keto ester containing a pyridine ring as radical trap has been studied. This intramolecular reaction of nucleophilic carbon-centered radicals with the pyridine ring leads to the stereospecific construction of a tetracyclic compound in which five chiral centers are created in one pot. This synthetic approach represents the f...

In the title compound, C20H19N3O4S, a novel tubulin ligand active against human cancer, the dihedral angle between the pyridine ring and the carbazole ring system is 42.87 (10)°. In the crystal, the mol-ecules are held together by N-H⋯O and C-H⋯O hydrogen bonds into layers, which are assembled into a three-dimensional network via π-π stacking inter-actions between inversion-related pyridine rin...

In the title compound, C(22)H(19)NO, the pyridine ring and the adjacent naphthalene ring system are nearly coplanar, making a dihedral angle of 3.3 (1)°, while the pyridine and benzene rings are perpendicular to each other, with a dihedral angle of 89.9 (1)°. The crystal packing is stabilized by inter-molecular O-H⋯N hydrogen bonds and C-H⋯π inter-actions.

In the title mol-ecule, C(9)H(10)ClN(3)O, the dihedral angle between the pyridine ring and imidazoline ring mean plane [maximum deviation = 0.031-(3) Å] is 76.2 (1)°. In the crystal, N-H⋯O hydrogen bonds link pairs of mol-ecules to form inversion dimers. In addition, weak C-H⋯N hydrogen bonds and π-π stacking inter-actions between pyridine rings [centroid-centroid distance = 3.977 (2) Å] are ob...

The title compound, C(21)H(21)NO(6)S(2), is organized around a twofold axis parallel to the crystallographic c axis and containing the N atom and a C atom of the pyridine ring. The tosyl moiety and the pyridine ring are both essentially planar [maximum deviations 0.028 (2) and 0.020 (3) Å, respectively]; their mean planes form a dihedral angle of 33.0 (2)°.

In the title mol-ecule, C(24)H(18)N(4)O(2), the dihedral angles between the mean plane of the phenanthroline ring system and the pyridine rings are 82.52 (5) and 71.58 (4)°. The dihedral angle between the two pyridine ring planes is 53.54 (6)°. In the crystal structure, there are π-π stacking inter-actions between 1,10-phenanthroline rings, with centroid-centroid distances of 3.6101 (11) and 3....

In the title compound, C(20)H(15)N(3)O, the diazepine ring adopts a boat conformation. The dihedral angle between pyridine and benzene rings is 55.2 (1)°. The benzoyl phenyl ring forms dihedral angles of 49.4 (1) and 75.9 (1)°, respectively, with the pyridine and benzene rings. In the crystal, mol-ecules are linked into centrosymmetric dimers by pairs of C-H⋯N hydrogen bonds.