1.1: potassium tert-butylate / N,N-dimethyl-formamide / 0.5 h / 0 °C 1.2: 42 h / 0 °C 2.1: trifluoroacetic acid / dichloromethane / 4 h / 20 °C 3.1: triethylamine / dichloromethane / 2.5 h / 20 °C View Scheme

1.1: potassium tert-butylate / N,N-dimethyl-formamide / 0.5 h / 0 °C 1.2: 42 h / 0 °C 2.1: trifluoroacetic acid / dichloromethane / 4 h / 20 °C 3.1: triethylamine / dichloromethane / 2.5 h / 20 °C 4.1: sodium azide / N,N-dimethyl-formamide / 3.5 h / 80 °C 5.1: palladium 10 on activated carbon; hydrogen / ethyl acetate / 12 h / 20 °C / 9000.9 Torr 6.1: (2R,3R)-(-)-di-O-(p-toluoyl)-tartaric acid / dimethyl sulfoxide / 3 h / 20 °C / Resolution of racemate 6.2: 1 h / 20 °C View Scheme

1.1: potassium tert-butylate / N,N-dimethyl-formamide / 0.5 h / 0 °C 1.2: 42 h / 0 °C 2.1: trifluoroacetic acid / dichloromethane / 4 h / 20 °C 3.1: triethylamine / dichloromethane / 2.5 h / 20 °C 4.1: sodium azide / N,N-dimethyl-formamide / 3.5 h / 80 °C 5.1: palladium 10 on activated carbon; hydrogen / ethyl acetate / 12 h / 20 °C / 9000.9 Torr 6.1: pyridine / ethyl acetate / 1 h / 20 °C View Scheme