1: tetrahydrofuran / 8 h / 0 - 55 °C 2: 2.19 g / aq. NaOH; aq. H2O2 / ethanol / 1 h / Heating 3: K2HPO4*3H2O; Na/Hg / methanol / 2 h / Heating 4: 2.35 g / aq. NaOH / CH2Cl2 / 1 h 5: 98 percent / Et3N / CH2Cl2 / 2 h / 0 - 20 °C 6: 95 percent / Pd(OAc)2; polymer-bound triphenylphosphine; Et3N / dimedone / tetrahydrofuran / 6 h / 20 - 50 °C 7: AD-mix-α; MeSO2NH2; H2O / 2-methyl-propan-2-ol / 168000 h / 3 - 6 °C 8: TBAF / tetrahydrofuran / 24 h / 20 °C 9: 291 mg / DMAP / CH2Cl2 / 20 °C 10: 96 percent / Amberlite IRA-401(OH) / methanol / 2 h / 20 °C View Scheme