Synthesis of benzoxazepine derivatives. IV. Anthracenooxazepines

The 3‐(3,4‐dimethoxyphenoxyalkylamino) phthalides (4) cyclize in PPA solution to demethylated and demethoxylated 2,3‐dihydro‐8‐oxo‐anthraceno [9, 9a, 1‐ef] 1,4‐oxazepines (7) as well as to 6,7,9,13b‐tetrahydro‐9‐oxo‐benzo [a] 1,4‐oxazepino [5,4‐a] isoindoles (6). Copyright © 1978 Wiley‐VCH Verlag GmbH & Co. KGaA, Weinheim