Reactions of stable N-(o-hydroxyarylacyl)benzotriazoles 4a-c / 6a-c with various aldehydes in the presence of base afforded 1,3-benzodioxin-4-ones 1a-d and naphtho-1,3-dioxinones 7a-c. Reaction with isocyanates under similar conditions afforded high yields of benzoxazine-2,4-diones 2a-c and naphthoxazine-1,3-diones 9a-b.

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