1: triethylamine / CH2Cl2 / 0 - 20 °C 2: NaN3 / dimethylformamide / 1 h / 100 °C 3: formic acid / diethyl ether / 1 h / 0 °C 4: pyridinium chlorochromate; NaOAc; molecular sieves 4 Angstroem / CH2Cl2 / 15 h / 20 °C 5: NaClO2; 2-methyl-2-butene; NaH2PO4*2H2O / H2O; 2-methyl-propan-2-ol / 1 h / cooling 6: H2 / Pd(OH)2/C / ethanol / 4 h / 20 °C 7: toluene / 1 h / Heating 8: DIBAL-H / CH2Cl2; toluene / 1 h / 0 °C 9: aq. K2CO3 / tetrahydrofuran / 2 h / 0 °C 10: (n-Bu)4NF / tetrahydrofuran / 8 h / 0 °C View Scheme