1: 59 percent / ammonia / methanol / 16 h / 80 °C 2: 90.9 percent / n-Bu3SnH, Et3B / benzene; hexane / Ambient temperature 3: 82.4 percent / TBAF / tetrahydrofuran / Ambient temperature View Scheme

1: 90 percent / mercaptoethanol, sodium methoxide / methanol / 4 h / Heating 2: 90 percent / n-Bu3SnH, Et3B / benzene; hexane / Ambient temperature 3: 79 percent / TBAF / tetrahydrofuran / Ambient temperature View Scheme

1: 85.5 percent / methanol; H2O / 18 h / 85 °C 2: 96.5 percent / 30percent aq. H2O2, pyridine / CH2Cl2 / Ambient temperature 3: 90 percent / TBAF / tetrahydrofuran / Ambient temperature View Scheme

1: 93 percent / n-Bu3SnH, Et3B / benzene; hexane / Ambient temperature 2: 83 percent / TBAF / tetrahydrofuran / Ambient temperature View Scheme