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Dihydroimidazole N-oxides 1 undergo 1,3-dipolar
cycloaddition with alkyne dipolarophiles and the cycloadducts suffer
isoxazoline N–O bond cleavage to afford ene-1,1-diamines, with
subsequent cyclisation to pyrrolo[1,2-a]imidazole-5,6-diones if
possible.
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