Cinchona alkaloids OMe OMe H N OH MOH N R 8S, 9R-quinine 8R, 9s-quinidine Enantiomeric B-hydroxyamine functionality Nucleophilic catalysts Wynberg, H Top. Stereochem. 1986, 16, 87Cinchona Alkaloids • Enantiomeric b-hydroxyamine functionality • Nucleophilic catalysts Wynberg, H. Top. Stereochem. 1986, 16, 87. S H N N OMe OH H N H H OH N OMe R 8S, 9R - quinine 8R, 9S - quinidine