1: 93 percent / TBAF / tetrahydrofuran / 4 h / Ambient temperature 2: 88 percent / tetrapropylammonium perruthenate, 4-methylmorpholine oxide, molecular sieves 4 Angstroem / CH2Cl2 / 72 h / Ambient temperature 3: 1.) Mg / 1.) THF, 50 deg C, 30 min; 2.) THF, 50-60 deg C, 2 h 4: 72 percent / PCC, celite, molecular sieves 4 Angstroem / CH2Cl2 / 4 h / Ambient temperature 5: 78 percent / TFA / tetrahydrofuran; H2O / 3 h / 0 °C View Scheme