1: N-ethyl-N,N-diisopropylamine; diphenyl phosphoryl azide / toluene / 1 h / 70 °C 2: 10 h / 95 °C 3: N,N-dimethyl-formamide / 20 h / 120 °C / |Inert atmosphere 4: hydrogen; palladium on activated charcoal / methanol / 3 h / 20 °C / 11251.1 Torr View Scheme

1: N-ethyl-N,N-diisopropylamine; diphenyl phosphoryl azide / toluene / 1 h / 70 °C 2: 10 h / 95 °C 3: N,N-dimethyl-formamide / 20 h / 120 °C / |Inert atmosphere 4: hydrogen; palladium on activated charcoal / methanol / 3 h / 20 °C / 11251.1 Torr 5: toluene / 18 h / |Reflux 6: sodium hydrogencarbonate / 1,4-dioxane / 2 h / 20 °C 7: sodium hydroxide; dihydrogen peroxide / dimethyl sulfoxide / 12 h / 20 - 25 °C 8: hydrogen; palladium 10 on activated carbon; hydrogenchloride / methanol; water / 3 h / 20 °C / 11251.1 Torr View Scheme