93574-02-8Relevant articles and documents
2H-3,1-Benzoxazine-2,4-(1H)-dione (Isatoic Anhydride). 15. Reactions With Lactone Enolates.
Coppola, Gary M.
, p. 769 - 772 (2007/10/02)
The reaction of N-methylisatoic anhydride, 1, with the lithium enolates derived from various butyrolactones or δ-valerolactone produces stable anthranoyl lactone derivatives 4.Heating these products in toluene results in a cyclization to afford 4-hydroxy-3-(2-hydroxyalkyl)-1-methyl-2(1H)-quinolinones, 8 and 14, in good yields.