scholarly journals Lactams. VIII. The alkaline ferricyanide oxidation of 3-substituted 1-(3,4-dimethoxyphenethyl)pyridinium salts: Effects of hydrocarbon substituents on orientation of the oxidation.

1977 ◽  
Vol 25 (8) ◽  
pp. 2072-2077 ◽  
Author(s):  
TOZO FUJII ◽  
KIYOSHI YOSHIDA ◽  
MASASHI OHBA ◽  
MORIHIRO MITSUKUCHI ◽  
IZUMI TANAKA ◽  
...  
Keyword(s):  
Pyridinium Salts ◽  
Alkaline Ferricyanide ◽  
Substituted 1

Sterically Crowded Heterocycles. III. A General Approach to Imidazo[1,2-a]pyridines by Ferricyanide Oxidation of Quaternary Pyridinium Salts

1996 ◽  
Vol 61 (1) ◽  
pp. 126-138 ◽  
Author(s):  
Richard Kubík ◽  
Stanislav Böhm ◽  
Iveta Ruppertová ◽  
Josef Kuthan
Keyword(s):  
Potassium Hydroxide ◽  
Potassium Ferricyanide ◽  
Pyridinium Salts ◽  
Oxidizing Agents ◽  
Quaternary Pyridinium Salts ◽  
Substituted 1

Substituted 1-(pyridin-2-yl)-2,4,6-triphenylpyridinium perchlorates 1b-1e were converted with potassium ferricyanide and potassium hydroxide to sterically crowded 2-phenyl-3-[(Z)-1,3-diphenyl-3-oxopropenyl]imidazo[1,2-a]pyridines 2b-2e accompanied by minor isomeric 2-benzoyl-3,5-diphenyl-1-(pyridin-2-yl)pyrroles 3c-3e. 4-Phenyl-2,6-di(4-substituted phenyl)-1-(pyridin-2-yl)pyridinium salts 4a, 4b gave exclusively corresponding imidazo[1,2-a]pyridines 5a, 5b while the ferricyanide oxidation of 1-(5-iodo- and 5-cyanopyridin-2-yl)-2,4,6-triphenylpyridinium perchlorates 6a, 6b led to mixtures of major imidazo[1,2-a]pyridines 7a-7c and minor pyrroles 8a-8c. Some mechanistic aspects of the oxidation procedure are discussed in connection with a resistance of 2,6-diphenyl-1,3,5-trimethylpyridinium perchlorate (9c) towards the oxidizing agents.

ChemInform Abstract: Synthesis of New Substituted 1-(3-Pyridyl)pyridinium Salts and 3,4- Diamino-2(1H)-pyridinones.

ChemInform ◽  
2010 ◽  
Vol 26 (33) ◽  
pp. no-no
Author(s):  
K. GEWALD ◽  
M. REHWALD ◽  
H. MUELLER ◽  
P. BELLMANN
Keyword(s):  
Pyridinium Salts ◽  
Substituted 1

Synthesis of new substituted 1-(3-pyridyl)pyridinium salts and 3,4-diamino-2(1H)-pyridinones

1995 ◽  
Vol 1995 (5) ◽  
pp. 787-791 ◽  
Author(s):  
Karl Gewald ◽  
Matthias Rehwald ◽  
Heike Müller ◽  
Peter Bellmann
Keyword(s):  
Pyridinium Salts ◽  
Substituted 1
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