Results 21 to 30 of about 12,753,193 (203)

An isoxazole strategy for the synthesis of 4-oxo-1,4-dihydropyridine-3-carboxylates

Beilstein Journal of Organic Chemistry, 2022
A method has been developed for the preparation of 2-alkyl-6-aryl-, 2-aryl-6-aryl and 2,6-diaryl-5-aryl/hetaryl-substituted methyl 4-oxo-1,4-dihydropyridine-3-carboxylates by Mo(CO)6-mediated ring expansion of methyl 2-(isoxazol-5-yl)-3-oxopropanoates ...
Timur O. Zanakhov, Ekaterina E. Galenko, Mikhail S. Novikov, Alexander F. Khlebnikov   +3 more
doaj   +1 more source

Evidence of Counterion Size Effect on the Stability of Columnar Phase of Ionic Liquid Crystals Based on Pyridinium Salts Derived from N-3,4,5-Tri(alkyloxy)-benzyl-4-pyridones

Crystals, 2022
The synthesis and characterization of novel ionic liquid crystals based on pyridinium salts with Br− and PF6− counterions are described in this work. These pyridinium salts were derived from 4-hydroxypyridine, both by N- and O-alkylation.
Isabela Dumitru, Florentina L. Chiriac, Monica Ilis, Iuliana Pasuk, Doina Manaila-Maximean, Marin Micutz, Teodora Staicu, Viorel Cîrcu   +7 more
doaj   +1 more source

One-pot multicomponent green synthesis of novel series of 4-hydroxy-2-pyridone-fused spiropyrans catalyzed by acetic acid

, 2023
An efficient one-pot multicomponent reaction is reported for synthesizing a novel series 4-hydroxy-2-pyridone-fused spiropyran through the reaction of 4-hydroxy-6-methylpyridine-2-ones alkaloids, malononitrile or ethyl cyanoacetate, and ninhydrin or ...
Mahmood Kamali (16489191), Asadollah Ebrahimi (16489194)   +1 more
core   +1 more source

Transacylierungen mit Acylderivaten des 4‐Pyridons [PDF]

Chemische Berichte, 1980
AbstractMit N‐Acyl‐4‐pyridonen (2a, b) sowie mit 4‐(Benzoyloxy)pyridin (3a) werden in Methylenchlorid oder Chloroform aliphatische und aromatische Amine sowie Thiole glatt zu den Amiden (4 – 6) und Thioestern (7, 8) acyliert. Primäre und sekundäre Alkohole reagieren langsamer, tert‐Butylalkohol nur noch mit 3a unter Basenkatalyse sowie mit den ...
Effenberger, Franz, Bessey, Eberhard
openaire   +1 more source

Excitation Energy-Dependent Decay Dynamics of the S₁ State of N‑Methyl-2-pyridone

, 2023
The UV-induced decay dynamics of N-methyl-2-pyridone is investigated using a femtosecond time-resolved photoelectron spectroscopy method. Irradiation in the wavelength range of 339.3–258.9 nm prepares N-methyl-2-pyridone molecules with very different ...
Dongyuan Yang (8968340), Benjie Fang (17425269), Baihui Feng (17425266), Zhigang He (544691), Guorong Wu (307379), Xueming Yang (593735)   +5 more
core   +1 more source

Continuous flow synthesis of some 6- and 1,6-substituted 3-cyano-4-methyl-2-pyridones [PDF]

Journal of the Serbian Chemical Society, 2019
In this study, six 6- and 1,6-substituted-3-cyano-4-methyl-2-pyridones were synthesized in a continuous flow microreactor system. The syntheses were realized at room temperature and the obtained results were compared to those achieved within classical ...
Tadić Julijana, Mihajlović Marina, Jovanović Mića, Mijin Dušan   +3 more
doaj   +1 more source

Synthesis of 5-Aroyl-2-aryl-3-hydroxypyridin-4(1H)-ones

Molbank, 2023
A two-stage synthesis of 5-aroyl-2-aryl-3-hydroxypyridin-4(1H)-ones (56–66% overall yields) was carried out by refluxing 5-aroyl-3-(benzyloxy)-2-(het)aryl-4H-pyran-4-ones with ammonium acetate in AcOH and subsequent debenzylation.
Elena V. Steparuk, Dmitrii L. Obydennov, Vyacheslav Y. Sosnovskikh   +2 more
doaj   +1 more source

The Construction of Polycyclic Pyridones via Ring-Opening Transformations of 3-hydroxy-3,4-dihydropyrido[2,1-c][1,4]oxazine-1,8-diones

Molecules, 2023
This work describes the synthesis of 3-hydroxy-3,4-dihydropyrido[2,1-c][1,4]oxazine-1,8-diones, their tautomerism, and reactivity towards binucleophiles. These molecules are novel and convenient building-blocks for the direct construction of biologically
Viktoria V. Viktorova, Elena V. Steparuk, Dmitrii L. Obydennov, Vyacheslav Y. Sosnovskikh   +3 more
doaj   +1 more source

Reactions of Trifluorotriacetic Acid Lactone and Hexafluorodehydroacetic Acid with Amines: Synthesis of Trifluoromethylated 4-Pyridones and Aminoenones

Molecules, 2022
Dehydroacetic acid and triacetic acid lactone are known to be versatile substrates for the synthesis of a variety of azaheterocycles. However, their fluorinated analogs were poorly described in the literature.
Vladislav V. Fedin, Sergey A. Usachev, Dmitrii L. Obydennov, Vyacheslav Y. Sosnovskikh   +3 more
doaj   +1 more source

A synthesis of 2,3-dihydro-4-pyridones [PDF]

Arkivoc, 2006
The reaction of 1-alkoxy-1,4-dien-3-ones with primary amines results in the formation of dihydropyridones in good yield.
Michael Harmata, Dong Reyoul Lee
openaire   +2 more sources