Structural analysis of three methyl N-phosphorylated 5,6-dihydroxy-2-azabicyclo[2.2.1]heptane-3-carboxylates

► N-diphenylphosphoryl and N-diphenylphosphoryloxy-2-azabicycles were di-hydroxylated. ► The crystalline structures of the di-hydroxybicycles were analyzed and discussed. ► Unexpected NOP to NP rearrangement during hydroxylation was study.