1.1: water; lithium hydroxide hydrate; dihydrogen peroxide / tetrahydrofuran / 0 °C / Inert atmosphere 1.2: pH 1 2.1: triethylamine; diphenyl phosphoryl azide / toluene / 0.5 h / 80 °C 2.2: 3 h / Reflux 3.1: formic acid / 3 h / 50 °C / Inert atmosphere 4.1: 1,1'-carbonyldiimidazole / tetrahydrofuran / 0.17 h / 0 °C 4.2: 16 h / Inert atmosphere; Reflux 5.1: hydrogen / palladium-on-charcoal / water; tetrahydrofuran / 20 °C / 760.05 Torr View Scheme