Cyclization of N-(propargylic)hydroxylamines catalyzed by AgBF4 afforded the corresponding 4-isoxazolines in good yields. Copper salts were found to promote the further transformation to acylaziridines. The combined use of AgBF4 and CuCl realized direct transformation of N-(propargylic)hydroxylamines into cis-acylaziridines.
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Wada et al. (2011) studied this question.
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