Brønsted Acid Triggers [6/7 + 1] Cascade Cyclization by N-Alkyl Amine C(sp3)–N Cleavage: Mild Synthesis of Benzo[1,4]oxazepane and Dihydrobenzo[1,5]oxazocine

A catalyst-free mild synthesis was reported to produce medium-ring oxazepane and oxazocine derivatives from aminomaleimides and