1.1: triethylamine / dichloromethane / 1 h / 20 °C / Inert atmosphere 2.1: 1,8-diazabicyclo[5.4.0]undec-7-ene / dichloromethane / 1 h / Inert atmosphere 3.1: tetrabutyl ammonium fluoride / tetrahydrofuran / 3 h 4.1: Dess-Martin periodane / dichloromethane / 2 h 5.1: sodium dihydrogenphosphate; sodium chlorite; 2-methyl-but-2-ene / tetrahydrofuran; water / 2 h 5.2: pH 2 6.1: BOP-Cl; triethylamine / acetonitrile / Inert atmosphere 7.1: lithium hydroxide hydrate / tetrahydrofuran; water / 2 h / 20 °C 7.2: pH 3 8.1: dichloromethane / 2 h / 20 °C 9.1: diphenyl phosphoryl azide / N,N-dimethyl-formamide / 2 h / 20 °C View Scheme