1: 1.)Zn, 2.) H2= / 1.) THF 2: aq. NaOH / 12 h / Heating 3: P2O5/H3PO4 / 0.75 h / 60 °C View Scheme

1: 1.)Zn, 2.) H2= / 1.) THF 2: aq. NaOH / 12 h / Heating View Scheme

1: 1.)Zn, 2.) H2= / 1.) THF 2: aq. NaOH / 12 h / Heating 3: P2O5/H3PO4 / 0.75 h / 60 °C 4: LDA / tetrahydrofuran / 0 °C 5: TsOH / dioxane; H2O / Heating View Scheme