A mild and practical synthesis of spirooxindole [1,3]oxazino derivatives from N-substituted isatins and 1,3-dicarbonyl compounds with pyridine derivatives is reported. The reactions provided good to excellent yields. Further exploration of the molecular diversity of these compounds is demonstrated through Diels-Alder reactions.

tion of pyridine nucleotides by spinach grana and coupled carbon dioxide fixation. Nature 167: 768769. 1951. 29. VISHNIAC, W. and OCHOA, S. Fixation of carbon dioxide coupled to the photochemical reduction of pyridine nucleotides bv chloroplast preparations. Jour. Biol. Chem. 195: 75-93. 1952. 30. ZBINOVSKY. V. and BURRIS. R. H. Metabolism of infiltrated organic acids by tobacco leaves. Plant P...

We present R-matrix calculations for electron scattering from microhydrated pyridine. We studied the pyridine-H2O cluster at static-exchange (SE), SE + polarization, and close-coupling levels, and pyridine-(H2O)n n = 2, 3, and 5 at SE level only in order to investigate the effect of hydrogen bonding on the resonances of pyridine. We analyse the results in terms of direct and indirect effects. W...

In the mol-ecule of the title compound, C(25)H(16)N(4), the pyridine rings are oriented at a dihedral angle of 0.92 (3)°, while the dihedral angle between the benzene ring and the adjacent pyridine ring is 56.51 (3)°. In the crystal structure, inter-molecular N-H⋯N hydrogen bonds link the mol-ecules into centrosymmetric dimers, forming R(2) (2)(16) ring motifs. π-π contacts between the pyridine...

In the title solvated molecular salt, C(6)H(9)N(2) (+)·C(7)H(4)NO(4) (-)·CH(4)O, the pyridine N atom of 2-amino-4-methyl-pyridine is protonated and one carboxyl group of pyridine-2,6-dicarb-oxy-lic acid is deprotonated. The dihedral angles between the -CO(2) and -COH groups and the pyridine ring are 0.65 (13) and 7.4°. The crystal packing is stabilized by inter-molecular N-H⋯O, O-H⋯O and weak C...

The title compound, C21H9F10N3, represents a potential redox non-innocent pyridine di-imine ligand system. It consists of a central pyridine ring with two penta-fluoro-phenyl substituted imine groups in positions 2 and 6. The whole mol-ecule is generated by mirror symmetry, the mirror bis-ecting the N and para-C atom of the pyridine ring. The perfluoro-phenyl ring is inclined to the pyridine ri...

The piperidine ring of the title compound, C(16)H(15)N(5), adopts a chair conformation. The pyridine ring is essentially planar, with a maximum deviation of 0.035 (3) Å. The pyrrole and pyridine rings are almost coplanar, forming a dihedral angle of 3.48 (14)°. In the crystal, no classical hydrogen bonds were found. In the crystal, the molecules are linked by aromatic π-π stacking [centroid-cen...

The asymmetric unit of the title compound, C(7)H(6)O(4)·C(5)H(5)N, consists of one 3,4-dihy-droxy-benzoic acid and one pyridine mol-ecule, both located on general positions. The 3,4-dihy-droxy-benzoic acid mol-ecules are arranged in layers and are connected by inter-molecular O-H⋯O hydrogen bonding, forming channels along the a axis in which the pyridine mol-ecules are located. The pyridine and...

Spectrophotometrical analysis of pyridine nucleotide transglycosidase in mammalian tissues indicated that the enzyme activity was observed to be distributed ubiquitously among the mammalian tissues analyzed, although the velocity ratio of transglycosidation/hydrolysis (vT/vH) and the partitioning of nicotinic acid against water differed with the pyridine nucleotide substrate and the mammalian s...

The title mol-ecule (alternative name: pyridine-3-carbohydrazide; C(6)H(7)N(3)O) was obtained from the reaction of ethyl nicotinate with hydrazine hydrate in methanol. In the amide group, the C-N bond is relatively short, suggesting some degree of electronic delocalization in the mol-ecule. The stabilized conformation may be compared with those of isomeric compounds picolinohydrazide (pyridine-...