1: 82 percent / sodium hydride / tetrahydrofuran / 3 h / Ambient temperature 2: 88 percent / hydrogen / Pd/C / ethyl acetate / 4 h 3: 93 percent / tetrabutylammonium fluoride monohydrate / tetrahydrofuran / 1 h / Ambient temperature 4: 71 percent / pyridinium dichromate / dimethylformamide / 24 h View Scheme

1: 82 percent / sodium hydride / tetrahydrofuran / 3 h / Ambient temperature 2: 88 percent / hydrogen / Pd/C / ethyl acetate / 4 h 3: 93 percent / tetrabutylammonium fluoride monohydrate / tetrahydrofuran / 1 h / Ambient temperature 4: 71 percent / pyridinium dichromate / dimethylformamide / 24 h View Scheme