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Maxim A. Bastrakov Alexey K. Fedorenko Alexey M. Starosotnikov Alexander Kh. Shakhnes 《Molecules (Basel, Switzerland)》2021,26(18)
1,3-Dipolar cycloaddition reactions of 2-substituted 5-R-3-nitropyridines and isomeric 3-R-5-nitropyridines with N-methyl azomethine ylide were studied. The effect of the substituent at positions 2 and 5 of the pyridine ring on the possibility of the [3+2]-cycloaddition process was revealed. A number of new derivatives of pyrroline and pyrrolidine condensed with a pyridine ring were synthesized. 相似文献
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Using the DFT/B3LYP method with the basis sets 6-31G*(**), we analyzed the vibrational spectra of nitrobenzene and nitropyridines
for free molecules and their solutions in water, ethanol, and benzene. The influence of a solvent on the behavior of the characteristic
spectral parameters of nitrobenzene is revealed, and the assignment of vibrations for nitropyridines is given.
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Translated from Zhurnal Prikladnoi Spektroskopii, Vol. 72, No. 4, pp. 450–453, July–August, 2005. 相似文献
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G. P. Sagitullina L. V. Glizdinskaya R. S. Sagitullin 《Chemistry of Heterocyclic Compounds》2005,41(6):739-744
The interaction of α, β-unsaturated nitro ketones and various enamines leads to the synthesis of 5-nitro-1,4-dihydropyridines
containing acetyl, amide, benzoyl, ester, and cyano groups in position 3, and also unsymmetrical 3,5-dinitro-1,4-dihydropyridines.
Aromatization of the nitrodihydropyridines was carried out with sodium nitrite in acetic acid.
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Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 6, pp. 858–863, June, 2005. 相似文献
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《Magnetic resonance in chemistry : MRC》2003,41(9):721-725
The 1H, 13C and 15N NMR spectra in DMSO‐d6 were measured for eight nitraminopyridine N‐oxides, ten 4‐nitropyridine N‐oxides, four 2‐nitraminopyridines and five 4‐nitropyridines. Their chemical shift assignments are based on PFG 1H,X (X = 13C and 15N) HMQC and HMBC experiments. The relative energies for the tautomers of two nitraminopyridine N‐oxides were determined by ab initio HF/6–311G** calculations. A single‐crystal x‐ray structural analysis was made for 4‐methyl‐2‐nitraminopyridine: C6H7O2N3, M = 153.15, triclinic, space group P‐1 (No. 2), a = 7.0275(4), b = 6.8034(3), c = 8.6086(5) Å, α = 103.620(2), β = 90.309(2), γ = 122.215(3)°, V = 334.11(3) Å3, Z = 2. Copyright © 2003 John Wiley & Sons, Ltd. 相似文献
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G. P. Sagitullina L. V. Glizdinskaya G. V. Sitnikov R. S. Sagitullin 《Chemistry of Heterocyclic Compounds》2002,38(11):1336-1341
Previously unknown 1,4-dihydropyridines containing acetyl, amide, benzoyl, ester, and cyano groups together with a nitro group were synthesized with preparative yields by a two-component Hantzsch synthesis based on 2-nitro-1,3-diphenylpropenone and various enamines. The nitrodihydropyridines were aromatized with sodium nitrite in acetic acid. The quaternary salts of low-basicity pyridines were produced with dimethyl sulfate and methyl fluorosulfonate. 相似文献
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