1.1: ethyl acetate / 1 h / 25 - 30 °C 1.2: 1 h / 25 - 30 °C 2.1: sodium hydroxide; water / tetrabutylammomium bromide / dichloromethane / -10 - -5 °C 2.2: 2 h / 25 - 30 °C View Scheme

1.1: hydrogen / 5 palladium on charcoal / ethyl acetate / 1 h / 25 - 30 °C / 2795.17 Torr / Autoclave 2.1: ethyl acetate / 1 h / 25 - 30 °C 2.2: 1 h / 25 - 30 °C 3.1: sodium hydroxide; water / tetrabutylammomium bromide / dichloromethane / -10 - -5 °C 3.2: 2 h / 25 - 30 °C View Scheme

1.1: sodium azide / N,N-dimethyl-formamide / 50 - 55 °C 2.1: hydrogen / 5 palladium on charcoal / ethyl acetate / 1 h / 25 - 30 °C / 2795.17 Torr / Autoclave 3.1: ethyl acetate / 1 h / 25 - 30 °C 3.2: 1 h / 25 - 30 °C 4.1: sodium hydroxide; water / tetrabutylammomium bromide / dichloromethane / -10 - -5 °C 4.2: 2 h / 25 - 30 °C View Scheme

1.1: potassium hydroxide; tetrabutylammomium bromide / ethyl acetate 2.1: hydrogenchloride / water / Reflux 2.2: pH 8 - 9 View Scheme

1: sodium hydroxide / water / 20 - 25 °C / pH 8 - 9 2: triethylamine / tetrahydrofuran 3: tetrabutylammomium bromide; potassium hydroxide / ethyl acetate 4: hydrogenchloride; water / |Reflux View Scheme