1: 99 percent / tetrabutylammonium fluoride / tetrahydrofuran / 3 h / Ambient temperature 2: 85 percent / sodium metaperiodate, water / diethyl ether / 3 h / Ambient temperature View Scheme

1: 99 percent / tetrabutylammonium fluoride / tetrahydrofuran / 3 h / Ambient temperature 2: 85 percent / sodium metaperiodate, water / diethyl ether / 3 h / Ambient temperature 3: 83 percent / sodium borohydride / methanol / 2 h / 0 °C View Scheme

1: 99 percent / tetrabutylammonium fluoride / tetrahydrofuran / 3 h / Ambient temperature 2: 85 percent / sodium metaperiodate, water / diethyl ether / 3 h / Ambient temperature 3: 1.) lithium 2,2,6,6-tetramethylpiperidine / 1.) THF, RT, 30 min, 2.) THF, 3 h View Scheme