Studies on 4-Pyrones and 4-Pyridones. III. The Preparation of Some New 5-Hydroxy-1-aryl-4-pyridone-2-carboxylic Acids and Related Compounds

By condensation of meconic acid with 4-chloroaniline, 4-bromoaniline, 3-nitroaniline and 1-naphthylamine, hitherto und esc ribed 5-hydroxy-1-a,ryl-4-piridone-2-carboxylic acids (I-IV) h ave been prepared. D ecarboxylation of the acids yielded several new 5-hydroxy- 1-aryl-4-pyridones (V-VII). Esterification of I-IV, as well as of two earlier reported analogous acids\u27 led to the for m ation of the corresponding esters (VIII-XIV) in good yield