1: pyridinium chlorochromate / CH2Cl2 / 1.5 h / Ambient temperature 2: 86 percent / KOH / diethyl ether; tetrahydrofuran; H2O / 1.) reflux, 10h, 2.) room temperature, 36 h. 3: 94 percent / TiCl4 / CH2Cl2 4: 90 percent / KF / methanol; H2O / Ambient temperature View Scheme

pyridinium chlorochromate in dichloromethane 1.5 h; Ambient temperature; Yield given;

1: pyridinium chlorochromate / CH2Cl2 / 1.5 h / Ambient temperature 2: 86 percent / KOH / diethyl ether; tetrahydrofuran; H2O / 1.) reflux, 10h, 2.) room temperature, 36 h. View Scheme