Microwave-Assisted Synthesis of Polysubstituted 4-Quinolones from Deprotonated α-Aminonitriles
作者:Alexandra Romek、Till Opatz
DOI:10.1002/ejoc.201000858
日期:2010.10
The α-alkylation of deprotonated N-aryl-α-aminonitriles with α-bromoesters furnishes intermediates that can be cyclized to 4-quinolones upon microwave irradiation. Alternatively, base-induced dehydrocyanation of the alkylation products furnishes enaminoesters, which can, for example, be converted into quinoline-3-carboxylates.
Gold-catalyzed cyclization of 1-(2′-azidoaryl) propynols: synthesis of polysubstituted 4-quinolones
作者:Xiang Wu、Lang-Lang Zheng、Li-Ping Zhao、Cheng-Feng Zhu、You-Gui Li
DOI:10.1039/c9cc06652g
日期:——
An unprecedented gold-catalyzed procedure for the synthesis of polysubstituted 4-quinolones from 1-(2'-azidoaryl) propynols is described. The reaction undergoes an intramolecular nucleophilic attack of the azide group to the Au-activated triple bonds in a 6-endo-dig manner and subsequent gold-assisted expulsion of N2 to furnish an α-imino gold carbene intermediate, which triggers a 1,2-carbon migration
One-Pot Synthesis of 4-Quinolone via Iron-Catalyzed Oxidative Coupling of Alcohol and Methyl Arene
作者:Seok Beom Lee、Yoonkyung Jang、Jiwon Ahn、Simin Chun、Dong-Chan Oh、Suckchang Hong
DOI:10.1021/acs.orglett.0c03011
日期:2020.11.6
Herein, we describe the iron(III)-catalyzed oxidative coupling of alcohol/methyl arene with 2-amino phenyl ketone to synthesize 4-quinolone. Alcohols and methyl arenes are oxidized to the aldehyde in the presence of an iron catalyst and di-tert-butyl peroxide, followed by a tandem process, condensation with amine/Mannich-type cyclization/oxidation, to complete the 4-quinolone ring. This method tolerates
Model Studies Related to Synthesis and 1,4-Dipolar Cycloaddition Reactions of Mesoionic Heterocycles
作者:Yvette Abd El-Sayed Issac
DOI:10.1246/bcsj.72.503
日期:1999.3
The reaction of 2-(substituted amino)pyridine with reactive malonic acidderivatives provided an extremely facile synthesis of the mesoionic compound 4-oxo-4H-pyrido[1,2-a]pyrimidin-1-ium-2-olates. N,N′-Disubstituted amidine reacted with diethyl malonate to afford 4-quinolone in a one-pot cyclization and rearrangement (type A/I) of 4-oxopyridiniumolate 6. The latter compound was isolated via a reaction
Interception of photochemical intermediate of thiazole derivatives. Formation and isomeristion of iminoazetine and azetinone intermediates
作者:Hiroshi Kato、Kozo Wakao、Akira Yamada、Masanobu Kojima
DOI:10.1039/c39840001558
日期:——
Irradiation of 4-aminothiazolium salts (7) in the presence of tributylphosphine gave enaminonitriles 9) and benzoylacetonotrile (8) by isomerisation and hydration of the iminoazetine intermediates (11), while a similar irradiation of the mesoionic triphenylthiazolium-4-oate (1) gave the quinolinol (5) by isomerisation of the azetione intermediate (3).