Indole β-nucleophilic substitution. Part 5. Synthesis of the four isomeric 5H-pyrido [x,y-b] carbazole-5,11-diones and benzo analogues
Abstract
The four isomeric 6H-pyrido[x′,y′:5,6]oxepino[3,2-b] indol-5(12H)-ones were transformed by alkali and air into the title pyridocarbazolequinones. A mechanism is proposed for these transformations.