pyridinium chlorochromate in dichloromethane 1.) 0 deg C, 5 h; 2.) rt., overnight;

1: 64 percent / potassium carbonate / tetrahydrofuran / Heating 2: 80 percent / lithium aluminium hydride / tetrahydrofuran / 1.) -78 deg C, 6 h; 2.) 0 deg C, overnight 3: 75 percent / pyridinium chlorochromate / CH2Cl2 / 1.) 0 deg C, 5 h; 2.) rt., overnight View Scheme

1: 80 percent / lithium aluminium hydride / tetrahydrofuran / 1.) -78 deg C, 6 h; 2.) 0 deg C, overnight 2: 75 percent / pyridinium chlorochromate / CH2Cl2 / 1.) 0 deg C, 5 h; 2.) rt., overnight View Scheme

1: 64 percent / potassium carbonate / tetrahydrofuran / Heating 2: 80 percent / lithium aluminium hydride / tetrahydrofuran / 1.) -78 deg C, 6 h; 2.) 0 deg C, overnight 3: 75 percent / pyridinium chlorochromate / CH2Cl2 / 1.) 0 deg C, 5 h; 2.) rt., overnight View Scheme