Chemistry of heterocyclic quinoneimines. 9. Reaction of benzo[a]phenoxazin-9-one with C-nucleophiles

Selective replacement of the hydrogen atom in the 5 position of the aromatic fragment of the substrate by the residue of a C-nucleophile, which is accompanied by rearrangement of the benzoquinoid structure to a naphthoquinoid structure, occurs in the reaction of benzoa]phenoxazin-9-one with cyanoacetic acid derivatives under conditions of activation of the reagent.See 1] for Communication 8.Translated from Khimiya Geterotsiklicheskikh Soedinenii, No. 4, pp. 538–541, April, 1988.