O-Unsaturated alkoxyamines are versatile compounds that can be cyclized to heterocyclic
5-membered rings by using onium ions, transition metals, Brønsted and Lewis acids. O-Allylic and
O-homoallylic alkoxyamines can be transformed to isoxazolidines, O-allenyl alkoxyamines to isoxazolidines
as well as to 2-isoxazolines and O-alkynyl alkoxyamines to 2- or 3-isoxazolines as well as to
Keywords: Alkoxyamine, hydroxylamine, isoxazolidine, isoxazoline, isoxazole, cyclization, synthesis, review.
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