Pyridinium N-imine salts 3 and 5-8 reacted smoothly with methylphenylcyclopropenone (2) in methylene chloride in the presence of triethylamine at room temperature to give the corresponding 2-methyl-4-phenyl-3H-pyrido[1,2-b]pyridazin-3-ones 14-19 in fairly good yields. 4,4a-Dihydro intermediates 10-13 were isolated from the reactions of 3, 4, and 9. Reaction of 2 with 3 in methanol containing triethylamine afforded β-amino ester 22 in addition to 14. Dipropylcyclopropenone (24) did not react with pyridinium N-imine salts in methanol containing triethylamine at room temperature, but did furnish 2,4-dipropyl-3H-pyrido[1,2-b]pyridazin-3-ones 25-28 with 3 and 5-7 under reflux conditions. Possible mechanisms of this reaction are discussed. © 1978...
The nickel perchlorate-initiated reaction between dimethyl esters of 2-aryl- and 2-styryl-substitute...
The cyclometallation of four different classes of nitrogen heterocycle (pyridazine, tetrazines, pyra...
The alkaline treatment and dehydrogenation of pyridinium salts, obtainable from the S-alkylation of ...
Methylphenylcyclopropenone (2) undergoes a cycloaddition reaction across the PhC-CO bond with 2-amin...
A synthesis of substituted pyridinium N-heteroarylaminides, e.g., I, is reported. Heteroaryl chlorid...
2-Alkoxycarbonylpyridinium N-aminides behave as 1,3-dipoles when reacted with Michael accepters, giv...
It was shown that for X = Cl or Br the reaction products unexpectedly proved to be the previously un...
Cette thèse a principalement porté sur le développement de nouvelles méthodes pour la synthèse d’hét...
The oxidation of 3-niono- and 3, 4-di-substituted 2-pyrazolin-5-ones was studied to determine whethe...
Reactions involving the catalytic dehydrocyclization of synthetically accessible substituted pyridin...
Diphenylcyclopropenone (1) reacts with 2-aminopyridines (2) in ether to produce cis-2,3-diphenylacry...
The syntheses of the title compounds from the reactions of 2-amino-3-(arylcarbonyl)indolizine-1-carb...
Different substituted pyridinium N-heteroarylaminides have been prepared in one step from N-aminopyr...
Pyridinium ylids are versatile tools in organic synthesis. The stability of pyridinium ylids and the...
This thesis has mainly focused on the development of new methods towards the synthesis of highly val...
The nickel perchlorate-initiated reaction between dimethyl esters of 2-aryl- and 2-styryl-substitute...
The cyclometallation of four different classes of nitrogen heterocycle (pyridazine, tetrazines, pyra...
The alkaline treatment and dehydrogenation of pyridinium salts, obtainable from the S-alkylation of ...
Methylphenylcyclopropenone (2) undergoes a cycloaddition reaction across the PhC-CO bond with 2-amin...
A synthesis of substituted pyridinium N-heteroarylaminides, e.g., I, is reported. Heteroaryl chlorid...
2-Alkoxycarbonylpyridinium N-aminides behave as 1,3-dipoles when reacted with Michael accepters, giv...
It was shown that for X = Cl or Br the reaction products unexpectedly proved to be the previously un...
Cette thèse a principalement porté sur le développement de nouvelles méthodes pour la synthèse d’hét...
The oxidation of 3-niono- and 3, 4-di-substituted 2-pyrazolin-5-ones was studied to determine whethe...
Reactions involving the catalytic dehydrocyclization of synthetically accessible substituted pyridin...
Diphenylcyclopropenone (1) reacts with 2-aminopyridines (2) in ether to produce cis-2,3-diphenylacry...
The syntheses of the title compounds from the reactions of 2-amino-3-(arylcarbonyl)indolizine-1-carb...
Different substituted pyridinium N-heteroarylaminides have been prepared in one step from N-aminopyr...
Pyridinium ylids are versatile tools in organic synthesis. The stability of pyridinium ylids and the...
This thesis has mainly focused on the development of new methods towards the synthesis of highly val...
The nickel perchlorate-initiated reaction between dimethyl esters of 2-aryl- and 2-styryl-substitute...
The cyclometallation of four different classes of nitrogen heterocycle (pyridazine, tetrazines, pyra...
The alkaline treatment and dehydrogenation of pyridinium salts, obtainable from the S-alkylation of ...