1: hydrazine monohydrate / AcOH / CH2Cl2 / 48 h / 0 °C 2: 76 percent / t-BuOK / tetrahydrofuran; pentane / 1.5 h / -100 °C / with KDA, too 3: 83 percent / periodinane / CH2Cl2 / Ambient temperature View Scheme

1: hydrazine monohydrate / AcOH / CH2Cl2 / 48 h / 0 °C 2: 76 percent / t-BuOK / tetrahydrofuran; pentane / 1.5 h / -100 °C / with KDA, too 3: periodinane / CH2Cl2 / Ambient temperature View Scheme

1: hydrazine monohydrate / AcOH / CH2Cl2 / 48 h / 0 °C 2: 76 percent / t-BuOK / tetrahydrofuran; pentane / 1.5 h / -100 °C / with KDA, too 3: 83 percent / periodinane / CH2Cl2 / Ambient temperature View Scheme