tetrabutyl ammonium fluoride in tetrahydrofuran 24 h; Ambient temperature;

1: trimethylsilyl triflate / 1,2-dichloro-ethane / 0.5 h 2: 89 percent / H2S, NaSH / methanol / 1 h / Heating 3: 65 percent / tetra-n-butylammonium fluoride (TBAF) / tetrahydrofuran / 24 h / Ambient temperature View Scheme

1: trimethylsilyl triflate / 1,2-dichloro-ethane / 0.5 h 2: 89 percent / H2S, NaSH / methanol / 1 h / Heating 3: 65 percent / tetra-n-butylammonium fluoride (TBAF) / tetrahydrofuran / 24 h / Ambient temperature View Scheme

1: 89 percent / H2S, NaSH / methanol / 1 h / Heating 2: 65 percent / tetra-n-butylammonium fluoride (TBAF) / tetrahydrofuran / 24 h / Ambient temperature View Scheme

1: chlorotrimethylsilane / 2 h / Heating 2: trimethylsilyl triflate / 1,2-dichloro-ethane / 0.5 h 3: 89 percent / H2S, NaSH / methanol / 1 h / Heating 4: 65 percent / tetra-n-butylammonium fluoride (TBAF) / tetrahydrofuran / 24 h / Ambient temperature View Scheme