Rearrangement of N-cyano-anthranilic acids to 1,2-dihydro-2-imino-3,1,4H-benzoxazin-4-ones and 2,4(IH,3H)-quinazoline-diones. Reactions of 1,2-dihydro-2-imino-3,1,4H-benzoxazin-4-one with hydroxylic reagents.