Nucleophilic displacements of N-aryl and heteroaryl groups. Part 3. Pyrylium-mediated synthesis of unsymmetrical diarylamines from anilines
作者:Alan R. Katritzky、Andrew J. Cozens
DOI:10.1039/p19830002611
日期:——
thionyl chloride followed by an aniline to give the amides (4)(70%). Refluxing in toluene with sodium hydride for 12 h transfers intramolecularly the 1-aryl group of the pyridinium salt (4) to the nitrogen of the amide. Aqueous work-up cleaves (6) and the diarylamine is purified by sublimation (60%)(overall yield ca. 30%).
Nucleophilic displacement of N-aryl and heteroaryl groups. Part 5. Conversion of 2-aminopyridines into 2-pyridones
作者:Alan R. Katritzky、Radi Awartani
DOI:10.1039/p19830002623
日期:——
2-Ethoxycarbonyl-1-(2-pyridyl)pyridinium cations (3)(easily prepared from 2-aminopyridine and the appropriate pyrylium salt) are converted by dilute NaOH at 25 °C into 1-(substituted 2-pyridylcarbonyl)-2-pyridones (7). Compounds (7) are readily hydrolysed to 2-pyridones.