Anthranilic Acid → 1-Phenyl-1H-benzo[d][1,3]oxazine-2,4-dione

Participants

Reaction Steps

The novel 1,2-diphenylquinolones of formula IV, where m is the integer 0, are prepared by three methods. In a first method the 1,2-diphenylquinolones (IV, m=0) are prepared by reaction of an appropriate N-phenylisatoic anhydride with an appropriate lower-alkyl benzoylacetate, hydrolysis of the resulting 1,2-phenylquinolone-3-carboxylate to the corresponding 3-carboxy compound and pyrolytic elimination of the carboxyl group. In a second method the 1,2-diphenylquinolones (IV, m=0) are prepared by reaction of an appropriate N-phenylisatoic anhydride with sodium methylsulfinylmethide (hereinafter dimsyl sodium), and reaction of the methylsulfinylacetophenone so obtained with an appropriate benzaldehyde. The N-phenylisatoic anhydride is prepared by reacting an appropriate 2-bromo (or chloro)benzoic acid with an appropriate aniline and reacting the resulting anthranilic acid with ethyl chloroformate. These steps are illustrated by the following equations: ##STR8##

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