1: DIBAL-H / -78 °C 2: DMAP; pyridine; DIBAL-H / CH2Cl2; hexane / -78 - 0 °C 3: 84 percent / SnBr4 / CH2Cl2 / 1.3 h / -78 °C 4: K2CO3 / methanol / 3 h / Heating 5: 217 mg / K2CO3 / acetone / 12 h 6: 86 percent / Bu3SnH; AIBN / toluene / 0.25 h / Heating 7: 72 percent / H2 / 10percent Pd/C / methanol; ethyl acetate / 7 h / 20 °C View Scheme