Synthesis of Nitrogen Heterocycles by the Ring Opening of Pyridinium Salts

2006 ◽  
Vol 45 (46) ◽  
pp. 7803-7806 ◽  
Author(s):  
Aaron M. Kearney ◽  
Christopher D. Vanderwal
Keyword(s):  
Ring Opening ◽  
Nitrogen Heterocycles ◽  
Pyridinium Salts

Synthesis of Nitrogen Heterocycles by the Ring Opening of Pyridinium Salts

2006 ◽  
Vol 118 (46) ◽  
pp. 7967-7970 ◽  
Author(s):  
Aaron M. Kearney ◽  
Christopher D. Vanderwal
Keyword(s):  
Ring Opening ◽  
Nitrogen Heterocycles ◽  
Pyridinium Salts

Synthesis of Nitrogen Heterocycles by the Ring Opening of Pyridinium Salts.

ChemInform ◽  
2007 ◽  
Vol 38 (11) ◽  
Author(s):  
Aaron M. Kearney ◽  
Christopher D. Vanderwal
Keyword(s):  
Ring Opening ◽  
Nitrogen Heterocycles ◽  
Pyridinium Salts

Synthesis of Nitrogen Heterocycles via Photochemical Ring Opening of Pyridazine N-Oxides

2016 ◽  
Vol 18 (19) ◽  
pp. 5142-5145 ◽  
Author(s):  
Maribel Portillo ◽  
Michael A. Maxwell ◽  
James H. Frederich
Keyword(s):  
Ring Opening ◽  
Nitrogen Heterocycles

scholarly journals Skeletal remodeling of chalcone-based pyridinium salts to access isoindoline polycycles and their bridged derivatives

2021 ◽  
Author(s):  
Lele Wang ◽  
Hua-Bin Han ◽  
Lijie Gu ◽  
Wenjing Zhang ◽  
Junwei Zhao ◽  
...  
Keyword(s):  
Ring Opening ◽  
Pyridinium Salts ◽  
Pyridinium Ring ◽  
Skeletal Reconstruction

Simultaneous deconstructive ring-opening and skeletal reconstruction of an inert, aromatic pyridinium ring is of great importance in synthetic communities. However, research in this area is still in its infancy. Here,...

Quaternary Nitrogen Heterocycles. I. Equilibrium and Spectral Data for Pseudobase Formation by the N-Methyl Cations of Diazanaphthalenes

1972 ◽  
Vol 50 (6) ◽  
pp. 917-931 ◽  
Author(s):  
John W. Bunting ◽  
William G. Meathrel
Keyword(s):  
Spectral Data ◽  
Ring Opening ◽  
Lithium Aluminum Hydride ◽  
Equilibrium Constants ◽  
Nitrogen Heterocycles ◽  
Aluminum Hydride ◽  
Ionization Constants ◽  
Lithium Aluminum ◽  
Quaternary Nitrogen ◽  
Hydride Reduction

Equilibrium constants have been measured at 25° for the formation of pseudobases from the 2-methyl-phthalazinium, 1-methylquinoxalinium, 1-methyl- 1,5-naphthyridinium, 6-methyl-1,6-naphthyridinium, 7-methyl-1,7-naphthyridinium, 1-methyl-1,8-naphthyridinium, 1-methyl-3-nitroquinolinium, and 2-methyl-4-nitroisoquinolinium cations. Ionization constants have also been obtained for ionization of some of these pseudobases to alkoxide anions. For each cation the site of hydroxide attack has been determined by comparison of the u.v. and p.m.r. spectra of the pseudobases, the corresponding methoxide adducts, and the lithium aluminum hydride reduction products. In all cases, except for the 1-methylquinoxalinium cation, only one major pseudobase species is present in solution, and ring-opening does not occur to any appreciable extent. The pseudobase of the 1-methylquinoxalinium cation exists in equilibrium with a considerable amount of its covalent hydrate from addition of water across the C3—N4 bond.

ChemInform Abstract: An Enantioselective Entry to Substituted 6-Membered Nitrogen Heterocycles from Chiral Pyridinium Salts via Selective Epoxidation of Tetrahydropyridine Intermediates.

ChemInform ◽  
2001 ◽  
Vol 32 (17) ◽  
pp. no-no
Author(s):  
Laurent Gil ◽  
Delphine Compere ◽  
Berangere Guilloteau-Bertin ◽  
Angele Chiaroni ◽  
Christian Marazano
Keyword(s):  
Nitrogen Heterocycles ◽  
Pyridinium Salts

Reactivity of pseudobases from pyridinium salts competition between hydrogen transfer and ring-opening reactions

Tetrahedron ◽  
1979 ◽  
Vol 35 (21) ◽  
pp. 2591-2593 ◽  
Author(s):  
F.Micheletti Moracci ◽  
S. Tortorella ◽  
B. Di Rienzo ◽  
F. Liberatore
Keyword(s):  
Ring Opening ◽  
Hydrogen Transfer ◽  
Pyridinium Salts ◽  
Ring Opening Reactions
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