1: 1) Mg / 2) Li2CuCl4 / 1) THF, 2) THF a) 1 h, b) -10 deg C, 3 h 2: 81.2 percent / pTsOH / methanol / 6 h / Ambient temperature 3: 62 percent / PCC / CH2Cl2 / 1 h / Ambient temperature View Scheme