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