Af acile 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,aseries of benzo-1,3,4-oxadiazepine derivativesw ereprepared (with yields up to 83 %).
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