Abstract 2‐Monosubstituted 3‐amino‐2H‐azirines 2 react with several heterocycles containing acidic NH groups via ring expansions, leading to benzo[g][1,2,5]thiadiazocin 1,1‐dioxide derivatives 6 and imidazoles 9, 10, and 13, respectively.
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Villalgordo et al. (1992) studied this question.
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