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The course of the acid-catalysed Prins reaction of tetrahydropyridines 1 with formaldehyde, leading to derivatives of piperidinodioxane 4 and 3-oxa-7-azabicyclononanes 5 and 6, is dramatically changed in the presence of manganese dioxide to give new products, 6-oxa-2-azabicyclo[3.2.1]octan-4-ones 7 and 8.
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Солдатенков et al. (2001) studied this question.
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