1: 57 percent / lead tetraacetate / CH2Cl2 / 1.25 h / -10 °C 2: 1.) n-BuLi, 2.) HMPA / 1.) THF, hexane, -100 deg C, 2 min, 2.) THF, hexane, from -100 deg C to RT 3: 61 percent / tetra-n-butylammonium fluoride / tetrahydrofuran / 15 h / Ambient temperature 4: potassium carbonate / methanol; H2O / 7.5 h / Ambient temperature 5: AcOH / H2O View Scheme

With  water in  trifluoroacetic acid T=-5°C; 3.5 h;   

Multi-step reaction with 3 steps 1: pyridine / 2 h / 20 °C2: 100 percent / H2 / Pt / ethanol3: 90 percent / H2O / trifluoroacetic acid / 3.5 h / -5 °C