hydrogen; palladium on activated charcoal in ethyl acetate 4 h;

1: 99 percent / hydrogen / Pd/C / ethyl acetate / 4 h 2: 83 percent / tetrabutylammonium fluoride monohydrate / tetrahydrofuran / 1 h / Ambient temperature View Scheme

1: 99 percent / hydrogen / Pd/C / ethyl acetate / 4 h 2: 83 percent / tetrabutylammonium fluoride monohydrate / tetrahydrofuran / 1 h / Ambient temperature 3: 81 percent / pyridinium dichromate / dimethylformamide / 24 h 4: 69 percent / potassium hydrogen carbonate / dimethylformamide / 24 h View Scheme

1: 99 percent / hydrogen / Pd/C / ethyl acetate / 4 h 2: 83 percent / tetrabutylammonium fluoride monohydrate / tetrahydrofuran / 1 h / Ambient temperature 3: 81 percent / pyridinium dichromate / dimethylformamide / 24 h View Scheme