Disclosed are compounds which are 4-hydroxy-2-quinolinone-3-carboxylic acid esters, e.g., 1-methyl-4-hydroxy-2-quinolinone-3-carboxylic acid ethyl ester, useful as anti-allergic agents and intermediates for 1-alkyl-4-alkoxy-quinolin-2(1H)-ones, and prepared by reacting an isatoic anhydride with an alkali metal salt of a malonic ester.
Disclosed are compounds which are 1-alkyl-4-alkoxyquinolin-2(1H)-ones, e.g., 1-methyl-4-butoxyquinolin-2(1H)-one, and which are useful as CNS depressant agents. The compounds may be prepared, for example, by reacting a 1-alkyl-4-hydroxyquinolin-2(1H)-one with an alkyl halide in presence of base.