General access to polyhydroxylated nortropane derivatives through hetero diels -alder cycloaddition

Title compounds were prepared by the intramolecular cyclisation of 4-aminocycloheptanones as the key step. The functionalisation of the iron-complexed tropone gave cyclohepta-1,3-dienes. The 4-aminocycloheptanones result from a heterocycloaddition between an acylnitroso compound and a eyclohepta-1,3-diene.