Results 81 to 90 of about 7,788 (207)
Dakin-West Trick in the Design of Novel 2-Alkyl(aralkyl) Derivatives of Oxazolo[3,2-a]pyridines
Molecules, 2005 A series of previously unavailable derivatives of 2-alkyl- and 2-benzylderivatives of oxazolo[3,2-a]pyridines III were obtained via tandem ring opening and ring closure from stable mesoionic 3-acyloxazolo[3,2-a]pyridinium-2-olates I.
Eugene V. Babaev +2 more
doaj +1 more source
Synthèse et réactivité des 2-Pyridones [PDF]
, 2014 Nous avons pu mettre au point, au cours de ce travail, une nouvelle voie de synthèse des 2-Pyridones non décrites dans la littérature, cette stratégie est basée sur l’utilisation des composés dicarbonylés et des cyanoacétamides.
Attar, Sarah
core
Molecules, 2004 The reaction of 4-hydroxycoumarin (1) with some primary amines 2a-h and morpholine (2i) under microwave irradiation occurred without opening of the lactone ring to give N-substituted 4-aminocoumarins 3a-i in excellent yields.
Ivo C. Ivanov, Edmont V. Stoyanov
doaj +1 more source
ChemistryOpen, 2019 1,2,4‐Oxadiazole[4,5‐a]piridinium chloride adds nucleophiles to undergo electrocyclic ring opening affording 1,2,4‐oxadiazole dienamino derivatives. These pyridinium salts represent a special class of Zincke salts that are prone to rearrange when treated
Dr. Stefano Carella +2 more
doaj +1 more source
SYNTHESIS AND ANTIINFLAMMATORY ACTIVITY OF SOME NOVEL THIENOPYRIMIDINE DERIVATIVES
Zagazig Journal of Pharmaceutical Sciences, 2004 4-Chloro-5,6,7,8-tetrahydrobenzothieno[2,3-d]pyrimidine (3) was reacted with 4-aminoacetophenone in ethanol to give 4(4- acetylanilino)5,6,7,8-tetrahydrobenzothieno[2,3-d]pyrimidine (4).
Zakaria Abd El-Samii +3 more
doaj +1 more source
Synthesis of 5-(substituted phenylazo)-6-hydroxy-4-methyl-3-cyano-2-pyridones from ethyl 3-oxo-2-(substituted phenylazo)butanoates, Short communication [PDF]
Journal of the Serbian Chemical Society, 2011 A new procedure for the synthesis of known azo pyridone dyes is presented. A series of 5-(substituted arylazo)-6-hydroxy-4-methyl-3-cyano-2-pyridones were prepared from ethyl 3-oxo-2-(substituted phenylazo)butanoates and cyanoacetamide in acetone using ...
GORDANA UŠĆUMLIĆ +3 more
doaj
Copper-Catalyzed Regioselective Imidation of 2‑Pyridones
We demonstrate a ligand- and glovebox-free regioselective direct C(3)–H imidation of 2-pyridones and also benzylic-type imidation of 2-pyridones bearing a methyl substituent employing Cu(OAc)2·H2O as the catalyst and N-fluorobenzenesulfonimide (NFSI) as ...
Alagiri Kaliyamoorthy (8706798) +4 more
core +1 more source
Évaluation de l’activité antibactérienne de quelques pyridones de synthèse [PDF]
, 2014 Évaluation de l’activité antibactérienne de quelques pyridones de ...
Arbaoui, Younes
core
O- and N-Difluoromethylation of 2-Pyridones with Chlorodifluoromethane
Журнал органічної та фармацевтичної хіміїDifluoromethylation 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 ...
Kirill I. Petko, Andrey A. Filatov
doaj +1 more source
, 2017 The cationic gold phosphine complex [(P1)Au(NCMe)]+SbF6– [P1 = P(t-Bu)2o-biphenyl; 2] catalyzes the intramolecular hydroamination of 6-alkenyl-2-pyridones to form 1,6-carboannulated 2-pyridones in high yield.
Jacob C. Timmerman (3119301) +2 more
core +1 more source