At. Soldatenkov et al., Prins reaction under manganese dioxide control: the synthesis of 6-oxa-2-azabicyclo[3.2.1]octan-4-ones from tetrahydropyridines and formaldehyde, MENDELEEV C, (1), 2001, pp. 27-29
The course of the acid-catalysed Prins reaction of tetrahydropyridines 1 wi
th formaldehyde, leading to derivatives of piperidinodioxane 4 and 3-oxa-7-
azabicyclononanes 5 and 6, is dramatically changed in the presence of manga
nese dioxide to give new products, 6-oxa-2-azabicyclo[3.2.1]octan-4-ones 7
and 8.