- Preparation of enantiopure 1-azabicyclo[3.2.2]nonanes functionalized at carbon C3, from cinchonine and cinchonidine. stereoselective solvolysis and an easily enolizable ketone. Röper, S., Franz, M.H., Wartchow, R., Hoffmann, H.M. J. Org. Chem. (2003)