As was anticipated based on mechanistic reasoning, bis-nucleophilic o-(arylamino)methyl phenols underwent a facile, base-promoted cyclocondensation with reactivity matched bis-electrophilic (hetero)aromatic substrates to give a rare type of substituted diarene-fused [1.4]oxazepines. This finding further supports the idea of the importance of the Smiles rearrangement in the interim of two S_NAr events ultimately leading to the formation of the central cycle in the newly formed tricylic scaffold.