Isomerization of enantiopure C-2-symmetric 3,5-dihydroxyazepane deriva
tives has been studied. The neighboring nitrogen participation occurs
during mesylation to give a chloromethylpiperidine, whereas from the L
-ido-azepane a chiral bridged morpholine structure (1R-(6endo, 7exo)-8
-oxa-3-azabicyclo[3.2.1] octane-6,7-diol) is obtained under Mitsunobu
conditions.