Results 201 to 210 of about 16,008 (266)

Rhodium(III)-Catalyzed C(sp2)-H Functionalization of Cyclobutenes. Access to Cyclobuta[c]pyridones and -pyridines.

Organic Letters, 2019
O-(ω-Alkynyl) hydroxamates derived from cyclobutenyl carboxylic acids were identified as viable substrates in intramolecular rhodium(III)-catalyzed heteroannulations, which led to diversely substituted cyclobuta[c]pyridones.
Tomas J. Saiegh, Henri Chédotal, C. Meyer, J. Cossy   +3 more
semanticscholar   +1 more source

Ambident Reactivities of Pyridone Anions

Journal of the American Chemical Society, 2010
The kinetics of the reactions of the ambident 2- and 4-pyridone anions with benzhydrylium ions (diarylcarbenium ions) and structurally related Michael acceptors have been studied in DMSO, CH(3)CN, and water. No significant changes of the rate constants were found when the counterion was varied (Li(+), K(+), NBu(4)(+)) or the solvent was changed from ...
Herbert Mayr, Martin Breugst
openaire   +3 more sources

New α-Pyridones with Quorum-Sensing Inhibitory Activity from Diversity-Enhanced Extracts of a Streptomyces sp. Derived from Marine Algae.

Journal of Agricultural and Food Chemistry, 2018
Four new α-pyrones (1-4) and eight known analogues (5-12) were identified from the secondary metabolites of Streptomyces sp. OUCMDZ-3436 derived from the marine green algae Enteromorpha prolifera.
Yuqi Du, Jian Sun, Qianhong Gong, Yi Wang, Peng Fu, Weiming Zhu   +5 more
semanticscholar   +1 more source

Unusual pyridone salts

Journal of the Chemical Society B: Physical Organic, 1968
The reaction between N-alkyl-2-pyridones and tetracyanoethylene produces 2 : 1 salts of the pyridone with pentacyanopropene. Metathetical exchange of these salts with 4H-quinolizin-4-one leads to mono- and bis-quinolizone salts. Similar salts are formed with hydroquinone in place of pentacyanopropene.
K. Rajagopalan, P. V. Gopalakrishnan, B.S. Thyagarajan   +2 more
openaire   +2 more sources

Rhodium(III)-Catalyzed C6-Selective Arylation of 2-Pyridones and Related Heterocycles Using Quinone Diazides: Syntheses of Heteroarylated Phenols.

Journal of Organic Chemistry, 2017
An efficient, direct C6-arylation of 2-pyridones has been successfully accomplished with quinone diazides under Rh(III)-catalyzed redox-neutral conditions. The optimized method is simple, mild, and highly regioselective with a broad substrate scope.
D. Das, Puja Poddar, Saurabh Maity, R. Samanta   +3 more
semanticscholar   +1 more source

Manganese(I)-Catalyzed C-H 3,3-Difluoroallylation of Pyridones and Indoles.

Organic Letters, 2017
A novel and efficient C-H activation approach for the direct 3,3-difluoroallylation of 2-pyridones and indoles is herein reported using a manganese(I) complex as the catalyst.
Jiabin Ni, H. Zhao, A. Zhang
semanticscholar   +1 more source

Pyridones as Potential Antitumor Agents

Journal of Pharmaceutical Sciences, 1979
AbstractDurch Persulfat‐Oxidation wird das Hydroxypyridin (I) in das Pyridon (II) übergeführt, aus dem das Acetylderivat (III) hergestellt wird.
John S. Driscoll, Deng Ruey Hwang
openaire   +4 more sources

Formal Gold- and Rhodium-Catalyzed Regiodivergent C-H Alkynylation of 2-Pyridones.

Journal of Organic Chemistry, 2016
Formal regiodivergent C-H alkynylation of 2-pyridones bearing different N-substituents has been realized under Au(I) and Rh(III) catalysis using a hypervalent iodine alkyne reagent.
Yunyun Li, F. Xie, Xingwei Li
semanticscholar   +1 more source

C6-Selective Direct Alkylation of Pyridones with Diazo Compounds under Rh(III)-Catalyzed Mild Conditions.

Journal of Organic Chemistry, 2016
A Rh(III)-catalyzed highly efficient C6-alkylation of 2-pyridones has been achieved successfully with α-diazo carbonyl compounds. The developed method is simple, mild, and highly regioselective with a broad range of substrate scope.
D. Das, Aniruddha Biswas, Ujjwal Karmakar, Santanu Chand, R. Samanta   +4 more
semanticscholar   +1 more source

Photoionization of 2-pyridone and 2-hydroxypyridine

Physical Chemistry Chemical Physics, 2010
We studied the photoionization of 2-pyridone and its tautomer, 2-hydroxypyridine by means of VUV synchrotron radiation coupled to a velocity map imaging electron/ion coincidence spectrometer. The photoionization efficiency (PIE) spectrum is composed of steps.
C. Poully, J., P. Schermann, J., Nieuwjaer, N., Lecomte, F., Grégoire, G., Desfrançois, C., A. Garcia, G., Nahon, L., Nandi, D., Poisson, L., Hochlaf, M.   +10 more
openaire   +6 more sources