1: DIBAL / toluene / 1 h / -78 °C 2: PDC / CH2Cl2 / 24 h / 25 °C 3: CH2Cl2 / 22 h / 40 °C 4: 1.) 0.02percent aq. HCl, 2.) aq. LiOH / 1.) MeOH, 25 deg C, 0.5 h, 2.) THF, MeOH, 25 deg C , 29 h 5: bis(2-oxo-3-oxazolidinyl)phosphinic chloride, i-Pr2NEt / toluene / 15 h / 85 °C 6: n-Bu4NF / tetrahydrofuran / 48 h / 25 °C 7: TFA / CH2Cl2 / 17 h / 25 °C 8: AgO, 1M HNO3 / dioxane / 2.5 h / 25 °C View Scheme