3, l-Benzoxazine-2,4-diones

Another method was developed for the synthesis of 5,8-methano-3,l-benzoxazine-2,4-diones 157. The A-BOC amino acid 156 was prepared from the half ester 155 without purification of the intermediates. Thus, 155 was treated with ethyl chloroformate, and subsequently with sodium azide. 

The wide range of chemical transformations to which 2//-3,l-benzoxazine-2,4-dione (isatoic anhydride) 4 has been subjected is beyond the scope of this chapter. A review published a few years ago on the transformations of isatoic anhydrides to heterocyclic compounds contains valuable information on other aspects of the chemical behavior of these compounds <2001CHE385>. 

COMPOUNDS BASED ON ISATOIC ANHYDRIDES (2H-3,l-BENZOXAZINE-2,4-DIONES). (REVIEW)... 

Data published after 1979 on the chemical transformations of 2H-3,l-benzoxazine-2,4-diones (isatoic anhydrides), leading to the formation of other heterocyclic compounds, are reviewed, classified, and analyzed. 

Isoamyl nitrite/trichloroacetic acid 4H-3,l,2-benzothiadiazin-4-ones from 3,l-benzoxazine-2,4-diones via o-aminothiolic acids Diazotization of aminothiolic acids... 

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