4214-79-3Relevant academic research and scientific papers
SPECTROSCOPIC INVESTIGATIONS OF PHASE TRANSITION IN 5-CHLORO-2-PYRIDONE
Raghoottama, P. S.,Soundararajan, S.,Ramakrishna, J.
, p. 371 - 384 (1987)
Spectroscopic investigation of 5-chloro-2-pyridone has been carried out in the temperature range 77-300 K.At room temperature the 35Cl NQR spectrum shows a single line at 35.618 MHz, but at 250.7 K two lines appear at 35.850 MHZ and 35.840 MHz respectively indicating the presence of a phase transition.IR, far-IR, laser Raman and dielectric measurements have been carried out to investigate the phase transition further.Low temperature IR studies show splitting of ν(C-Cl), β(N-H) and ν(C=O) bands at Tc.Dielectric measurements show a small, but finite, change in the value of the dielectric constant around Tc.Raman spectra at different temperatures support the existence of a new phase, as shown by the appearance of a new band at 81 cm-1, the frequency of which changes slowly as Tc is approached and which disappears at Tc.The temperature dependence of the NQR frequencies has been analysed using Bayer Kushida and Brown equations to evaluate the torsional frequencies.
5-alkyl-N-substituted aryl pyridone derivative, preparation method thereof and application of derivative
-
Paragraph 0109; 0112-0114, (2019/10/04)
The invention provides a compound as shown in a formula I, or pharmacologically acceptable salt of the compound, or a prodrug of the compound, or a hydrate or solvate of the compound or a crystal form of the compound. The invention further provides a preparation method and an application of the compound. The structurally novel 5-methyl-2(1H) pyridone derivative as shown in the formula I has an obvious inhibiting effect on fibroblast proliferation and fibroblast secretory fiber binding protein (Fn), and the inhibiting effect is more significant than that of a positive drug pirfenidone (PF). The compound has an excellent application prospect in preparation of drugs for treating or preventing diseases such as fibrosis diseases and tumors.
Chemoselective Demethylation of Methoxypyridine
Makino, Kosho,Hasegawa, Yumi,Inoue, Takahide,Araki, Koji,Tabata, Hidetsugu,Oshitari, Tetsuta,Ito, Kiyomi,Natsugari, Hideaki,Takahashi, Hideyo
, p. 951 - 954 (2019/05/10)
A chemoselective demethylation method for various methoxypyridine derivatives has been developed. Treatment of 4-methoxypyridine with L-selectride in THF for 2 h at reflux temperature afforded 4-hydroxypyridine in good yield; no reaction to anisole occurred. The utility of our method was demonstrated by the efficient synthesis of the metabolic substances of the antiulcer agent omeprazole. Chemoselective demethylation at the site of 3,5-dimethyl-4-methoxypyridine in the presence of 4-methoxybenzimidazole was achieved.
Convenient chlorination of some special aromatic compounds using N-chlorosuccinimide
Gan, Zongjie,Hu, Bin,Song, Qiao,Xu, Yungen
experimental part, p. 1074 - 1078 (2012/05/04)
Some chlorinated aromatic compounds, including indole, benzofuran, carbazole, pyridine and aniline derivatives, are difficult to obtain through convenient chlorination. We herein report their efficient synthesis through chlorination with N-chlorosuccinimide (NCS). Optimization of the reaction conditions, including the temperature and the choice of solvent, was also investigated. This approach, which is characterized by a facile procedure, comparatively high yields and environmentally friendly features, provides a straightforward and inexpensive route to several chlorinated aromatic compounds. Georg Thieme Verlag Stuttgart · New York.
Synthesis and structure-activity relationship of 5-substituent-2(1H)- pyridone derivatives as anti-fibrosis agents
Chen, Jun,Lu, Miao-Miao,Liu, Bin,Chen, Zhuo,Li, Qian-Bin,Tao, Li-Jian,Hu, Gao-Yun
scheme or table, p. 2300 - 2302 (2012/04/18)
Pyridone compounds, such as pirfenidone (PFD) and fluorofenidone (AKF-PD), are multi-target anti-fibrotic agents. Using PFD and AKF-PD as the leading compounds, two series of novel (5-substituent)-2(1H)-pyridone compounds were synthesized with the purpose of maintaining multi-targeting property and overcoming the drawbacks of fast metabolism. These derivatives demonstrated good proliferation inhibiting activity against NIH3T3 cells by MTT assay with AKF-PD as the positive control. Compound 5b exhibited a high potent of anti-fibrosis with a IC50 of 0.08 mmol/L about 34 times of AKF-PD. The SAR of pyridone derivatives as anti-fibrosis agents was also discussed.
The Preparation and Characterization of Some N-Chloro-2- and N-Chloro-4-pyridones
Katritzky, Alan R.,Khan, Ghulam R.,Leahy, David E.,Rosa, Michael De
, p. 4784 - 4786 (2007/10/02)
2-Pyridone and 5-chloro-2-pyridone with NaOCl yield 1-chloro-2-pyridone and 1,5-dichloro-2-pyridone, respectively, which rapidly rearrange into 5-chloro- and 3,5-dichloro-2-pyridone. 3,5-Dichloro-2-pyridone with NaOCl yields 1,3,5-trichloro-2-pyridone which shows considerable stability. 4-Pyridone is similarly converted by NaOCl into 3,5-dichloro-4-pyridone via an unstable N-chloro derivative. 1,3,5-Trichloro-4-pyridone was obtained from 3,5-dichloro-4-pyridone and NaOCl.
Nucleophilic Displacement of N-Aryl and Heteroaryl Groups. Part 5. Conversion of 2-Aminopyridines into 2-Pyridones
Katritzky, Alan R.,Awartani, Radi
, p. 2623 - 2627 (2007/10/02)
2-Ethoxycarbonyl-1-(2-pyridyl)pyridinium cations (3) (easily prepared from 2-aminopyridine and the appropriate pyrylium salt) are converted by dilute NaOH at 25 deg C into 1-(substituted 2-pyridylcarbonyl)-2-pyridones (7).Compounds (7) are readily hydrolysed to 2-pyridones.
