A facile synthesis of seven‐membered benzo‐1,3,4‐oxadiazepines through one‐step intramolecular cyclization of N‐(2‐hydroxybenzoyl)hydrazones has been established. The catalytic and substituent effects on the reactivity of this intramolecular cyclization were investigated. Through this strategy, a series of benzo‐1,3,4‐oxadiazepine derivatives were prepared (with yields up to 83 %).

中文翻译：

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N-（2-羟基苯甲酰基）hydr分子向N，N'-二乙酰基苯并-1,3,4-氧杂二氮杂卓衍生物的分子内环化反应

通过N-（2-羟基苯甲酰基）hydr的一步分子内环化反应，已轻松合成了七元苯并-1,3,4-氧杂二氮杂。研究了该分子内环化反应的催化作用和取代基作用。通过这种策略，制备了一系列苯并-1,3,4-氧杂二氮杂卓衍生物（产率高达83％）。