1: hydrogen / palladium 10 on activated carbon / methanol / 12 h / 20 °C / 2250.23 Torr 2: (+)-cinchonine / acetone / Resolution of racemate; Reflux 3: triethylamine; diphenyl phosphoryl azide / toluene / 5.5 h / 80 °C / Inert atmosphere; Reflux 4: water; lithium hydroxide hydrate / methanol / 24 h / 20 °C View Scheme