1: 70 percent / pyridine / CH2Cl2 / 0.17 h / 0 °C 2: 1.) Et3N, 2.) bis(dibenzylideneacetone)palladium(0), triisopropyl phosphite / 1) THF, hexane, 60 deg C, 10-20 min; 2) THF, hexane, 60 deg C, 1-2 h; further reagent and solvent 3: 97 percent / Na, methanol / Ambient temperature View Scheme