Abstract: | The synthesis of 2-oxa-6-aza-adamantane ( 21 ) and several of its derivatives ( 13–20 , 22 , 23 , 25–34 , 37 , and 38 ) was achieved starting from the 9-azabicyclo3.3.1]nona-2,6- dienes 2 , and 3 , and 9-oxabicyclo3.3.1]nona-2,6-diene ( 1 ). |