1.1: 94 percent / Dess-Martin periodinane / CH2Cl2 / 19 h / 20 °C 2.1: 91 percent / LiAlH(O-t-Bu)3 / tetrahydrofuran / 2 h / -20 - 0 °C 3.1: 87 percent / triphenylphosphine; DEAD / tetrahydrofuran; toluene / 3 h / 0 °C 4.1: 51 percent / BF3*OEt2 / 5 h / -20 °C 5.1: TFA / CH2Cl2 / 3 h / 0 - 20 °C 5.2: 81 percent / triethylamine / CH2Cl2 / 16 h / 0 - 20 °C 6.1: HCl / 24 h / 20 °C 6.2: water / ethanol / 2 h / 20 °C 6.3: 74 percent / aq. ammonia / ethanol / 10 h / 20 °C View Scheme