1: 2,6-lutidine / CH2Cl2 / 0.5 h / Ambient temperature 2: diisobutylaluminum hydride / CH2Cl2 / 1 h / -78 °C 3: pyridinium chlorochromate / CH2Cl2 / 1 h / Ambient temperature 4: 1) LDA, 2) (CO2H)2 / 1) THF, -78 deg C to 20 deg C, 2) 1.5h, r.t. 5: 1) CrCl3, LiAlH4, 2) DIBAL / 1) THF, 0 deg C, 10 min to r.t., 45 min, 2) CH2Cl2, -50 deg C, 30 min 6: 33 percent / 1) CuSO4/SiO2, 2) 46percent HF / 1) C6H6, 50 deg C, 1.5h, 2) MeOH, THF, r.t., 5h View Scheme