Convenient Assembly of Privileged (Hetero)Arene-Fused Benzo[1.4]oxazepines by Two Tandem SNAr Events. Part 2 – The Use of o-[N-(Hetero)aryl]aminomethyl Phenols

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 SNAr events ultimately leading to the formation of the central cycle in the newly formed tricylic scaffold.