1.1: methanol; water / 2 h 2.1: manganese(IV) oxide / acetonitrile / 24 h / 60 °C 3.1: dichloromethane / 1 h / Inert atmosphere 4.1: benzotriazol-1-ol; triethylamine / dichloromethane / 0.03 h 5.1: dichloromethane / 1 h 6.1: benzotriazol-1-ol; triethylamine / dichloromethane / 0.03 h 7.1: triethylamine / dichloromethane / 2 h / 20 °C / Inert atmosphere 8.1: 1,8-diazabicyclo[5.4.0]undec-7-ene / dichloromethane / 4 h / 20 °C / Inert atmosphere 9.1: methanol / 3 h 10.1: BOP-Cl; triethylamine / acetonitrile / Inert atmosphere 11.1: lithium hydroxide hydrate / tetrahydrofuran; water / 2 h / 20 °C 11.2: pH 3 12.1: dichloromethane / 2 h / 20 °C 13.1: diphenyl phosphoryl azide / N,N-dimethyl-formamide / 2 h / 20 °C View Scheme