4-Hydroxyquinol-2-ones. 87. Unusual synthesis of 1-R-4-hydroxy-1-oxo-1,2- dihydroquinoline-3-carboxylic acid pyridylamides

Article abstract of DOI:10.1007/s10593-005-0296-z

4-Chloro-2-oxo-1,2-dihydroquinoline-3-carboxylic acids and their esters react with aminopyridines in refluxing DMF to give the corresponding 4-hydroxy-2-oxo-1,2-dihydroquinoline-3-carboxylic acid pyridylamides. Their structures were proved by ¹