1: 86 percent / pyridine, N,N-dimethylaminopyridine (DMAP) / CH2Cl2 / 1) -78 deg C, 1 h, 2) to 0 deg C, 12 h 2: 71 percent / triethylamine, 1,8-diazabicyclo<5.4.0>undec-7-ene (DBU) / CH2Cl2 / 6 h / 0 °C 3: 75 percent / diisobutylaluminium hydride (DIBAL-H) / tetrahydrofuran / 1 h / 0 °C 4: 95 percent / pyridine, N,N-dimethylaminopyridine (DMAP) / CH2Cl2 / 12 h / Ambient temperature 5: 80 percent / pyridinium chlorochromate, 3 Angstroem molecular sieves / CH2Cl2 / 12 h / Ambient temperature 6: 100 percent / 50percent aq. CF3COOH / 4 h / Ambient temperature View Scheme