Abstract
4,5-Dihydro-1H-imidazole 3-oxides bearing different substituents at positions 1 and 2 of the heterocycle were shown to react with a wide range of acceptor-substituted alkynes forming corrsponding cycloadducts - derivatives of 1,2,3,7a-tetrahydroimidazo[1,2-b]isoxazole. High regioselectivity of this process stipulated by conjugation of the nitrogen atom with the nitrone group was revealed.
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