1: With hydrogenchloride; water in 1,4-dioxane T=100°C; 2: With sodium hydroxide in water

thionyl chloride; LiAlH4; Na2S2; triethylamine in tetrahydrofuran

1: potassium carbonate; N-ethyl-N,N-diisopropylamine / tetrahydrofuran / |Inert atmosphere; |Reflux 2: sodium hydrogencarbonate / water; dichloromethane / 5 h / 0 - 20 °C 3: toluene-4-sulfonic acid / toluene / 70 °C 4: hydrogenchloride / water; 1,4-dioxane / 100 °C View Scheme

1: sodium hydrogencarbonate / water; dichloromethane / 5 h / 0 - 20 °C 2: toluene-4-sulfonic acid / toluene / 70 °C 3: hydrogenchloride / water; 1,4-dioxane / 100 °C View Scheme

1: toluene-4-sulfonic acid / toluene / 70 °C 2: hydrogenchloride / water; 1,4-dioxane / 100 °C View Scheme

1: trifluoroacetic acid; trimethylsilylazide / 48 h / 20 °C 2: lithium aluminium tetrahydride / tetrahydrofuran; diethyl ether / |Reflux View Scheme

1: trifluoroacetic acid; trifluoroacetic anhydride / 60 °C 2: trifluoroacetic acid; trimethylsilylazide / 48 h / 20 °C 3: lithium aluminium tetrahydride / tetrahydrofuran; diethyl ether / |Reflux View Scheme

hydrogenchloride; sodium cyanoborohydride in methanol T=20°C; pH=4 - 5; 0.5 h;