How is 1,4-Oxazepane (CAS: 5638-60-8) typically synthesized?

1,4-Oxazepane (CAS: 5638-60-8) is typically synthesized via the condensation of 1,4-dicarbonyl compounds with primary amines in the presence of a Lewis acid catalyst. Commonly, aluminum trichloride (AlCl3) is used as the catalyst, leading to a high yield of the product under mild conditions. This synthesis method offers good control over selectivity and can be scaled up for industrial production.