A new photochemical synthesis of benzoxazolo[3,2-b]isoquinolin-11-one and isoquinolino[3,2-b][1,3]benzoxazin-11-one

Photocyclization of substituted tetrahydroisoquinoline-1,3-diones, under base-mediated conditions, afforded benzoxazolo[3,2-b]isoquinolin-11-ones and an isoquinolino[3,2-b]benzoxazin-11-one.