Synthesis of 2-Aryl-3-hydroxyquinolin-4(1H)-ones

Eight substituted phenacyl anthranilates have been prepared by reaction of sodium anthranilate with substituted phenacyl halides in dimethylformamide in the yields from 31 to 93%. The phenacyl esters were cyclized in polyphosphoric acid or by mere heating to give the respective substituted 2-aryl-3-hydroxyquinolin-4(1H)-ones in the yields from 77 to 98%. All the compounds prepared have been characterized by their 1H and 13C NMR spectra.