O- and N-Difluoromethylation of 2-Pyridones with Chlorodifluoromethane
DOI:
https://doi.org/10.24959/ophcj.24.312997Keywords:
2-pyridones, difluorometylation, chlorodifluoromethaneAbstract
Difluoromethylation of various 2-pyridones with the available industrial reagent chlorodifluoromethane (Freon-22) has been studied. Some relationships between the ratio of difluoromethylation products and the reaction conditions, as well as the presence of substituents in the pyridine ring, have been found. The possibility of obtaining difluoromethylation products at the nitrogen atom, in some cases with a preparative yield, has been investigated.
Supporting Agency
- The authors received no specific funding for this work.
Downloads
References
- Lindenblad, G. E.; Kaihara, M.; Price, J. M. The occurrence of N-Methyl-2-pyridone-5-carboxylic acid and it’s glycine conjugate in normal human urine. J. Biol. Chem. 1956, 219, 893 - 901. https://doi.org/10.1016/S0021-9258(18)65747-3.
- Gray, D.; Gallagher, T. A Flexible Strategy for the Synthesis of Tri- and Tetracyclic Lupin Alkaloids: Synthesis of (+)-Cytisine, (±)-Anagyrine, and (±)-Thermopsine. Angew. Chem. Int. Ed. 2006, 45 (15), 2419 - 2423. https://doi.org/10.1002/anie.200504015.
| | - Khalil, I. M.; Barker, D.; Copp, B. R. Bioinspired synthesis of the pyridoacridine marine alkaloids: demethyldeoxyamphimedine, deoxyamphimedine, and amphimedine. J. Org. Chem. 2016, 81 (1), 282-289. https://doi.org/10.1021/acs.joc.5b02312.
| | - Kirk, K. L. Fluorination in Medicinal Chemistry: Methods, Strategies, and Recent Developments. Org. Process Res. Dev. 2008, 12 (2), 305 - 321. https://doi.org/10.1021/op700134j.
| - Chowdhury, M. A.; Abdellatif, K. R. A.; Dong, Y.; Das, D.; Suresh, M. R.; Knaus, E. E. Synthesis of Celecoxib Analogues Possessing a N-Difluoromethyl-1,2-dihydropyrid-2-one 5-Lipoxygenase Pharmacophore: Biological Evaluation as Dual Inhibitors of Cyclooxygenases and 5-Lipoxygenase with Anti-Inflammatory Activity. J. Med. Chem. 2009, 52 (6), 1525 - 1529. https://doi.org/10.1021/jm8015188.
| | - Shen, T. Y.; Lucas, S.; Sarett, L. H. Chlorodifluoromethane as a difluoromethylating agent. Tetr. Lett. 1961, 2 (2), 43 - 47. https://doi.org/10.1016/S0040-4039(01)99204-4.
- Zhu, Z.; Krishnamurti, V.; Ispizua-Rodriguez, X.; Barrett, C.; Prakash S. Chemoselective N- and O-difluoromethylation of 2-Pyridones, Isoquinolinones, and Quinolinones with TMSCF2Br. Org. Lett. 2021, 23 (16), 6494 - 6498. https://doi.org/10.1021/acs.orglett.1c02305.
| | - Ando, M.; Wada, T.; Sato, N. Facile one-pot synthesis of N-difluoromethyl-2-pyridone derivatives. Org. Lett. 2006, 8 (17), 3805 - 3808. https://doi.org/10.1021/ol061481f.
| | - Yu, G.; Praveen Rao, P. N.; Chowdhury, M. A.; Abdellatif, K. R. A.; Dong, Y.; Das, D.; Velazquez, C. A.; Suresh, M. R.; Knaus, E. E. Synthesis and biological evaluation of N-difluoromethyl-1,2-dihydropyrid-2-one acetic acid regioisomers: dual inhibitors of cyclooxygenases and 5-lipoxygenase. Bioorg. Med. Chem. Lett. 2010, 20 (7), 2168 - 2173. https://doi.org/10.1016/j.bmcl.2010.02.040.
| | - Zhou, S.; Hou, X.; Yang, K.; Guo, M.; Zhao, W.; Tang, X.; Wang, G. Direct synthesis of N-difluoromethyl-2-pyridones from pyridines. J. Org. Chem. 2021, 86 (9), 6879 - 6887. https://doi.org/10.1021/acs.joc.1c00228.
| | - Petko, K. I.; Yagupolskii, L. M. Unusual difluoromethylation of 2-mercaptoazoles. J. Fluor. Chem. 2001, 108 (2), 211 - 214. https://doi.org/10.1016/S0022-1139(01)00350-5.
| - Petko, K. I.; Yagupolskii, L. M. Difluoromethylation of 5-sulfanyltetrazoles. Russ. J. Org. Chem. 2004, 40 (4), 601 - 602. https://doi.org/10.1023/B:RUJO.0000036093.66034.cc.
| - Petko, K. I.; Sokolenko, T. M.; Yagupolskii, L. M. Difluoromethylation of Heterocyclic Compounds Containing an N=C-C Ambident Nucleophilic System. Russ. J. Org. Chem. 2005, 41 (3), 429 - 433. https://doi.org/10.1007/s11178-005-0182-2.
| - Landelle, G.; Schmitt, E.; Pannosian, A.; Vors. J-P.; Pazenok, S.; Jeschke, P.; Gutbrod, O.; Leroux, F. R. Tri- and difluoromethylated N-based heterocycles – synthesis and insecticidal activity of novel F3CO- and F2HCO- analogs of Imidacloprid and Thiacloprid. J. Fluor. Chem. 2017, 203, 155 - 165. https://doi.org/10.1016/j.jfluchem.2017.08.006.
|
Downloads
Published
How to Cite
Issue
Section
License
Copyright (c) 2024 National University of Pharmacy
This work is licensed under a Creative Commons Attribution 4.0 International License.
Authors publishing their works in the Journal of Organic and Pharmaceutical Chemistry agree with the following terms:
1. Authors retain copyright and grant the journal the right of the first publication of the work under Creative Commons Attribution License allowing everyone to distribute and re-use the published material if proper citation of the original publication is given.
2. Authors are able to enter into separate, additional contractual arrangements for the non-exclusive distribution of the journal’s published version of the work (e.g., post it to an institutional repository or publish it in a book) providing proper citation of the original publication.
3. Authors are permitted and encouraged to post their work online (e.g. in institutional repositories or on authors’ personal websites) prior to and during the submission process, as it can lead to productive exchanges, as well as earlier and greater citation of published work (see The Effect of Open Access).