1: 1) Mg / 2)Li2CuCl4 / 1) THF, 2) THF, -10 deg C, 5 h 2: 50 percent / pTsOH / methanol / 6 h / 55 °C View Scheme

1: 1) Mg / 2)Li2CuCl4 / 1) THF, 2) THF, -10 deg C, 5 h 2: 70 percent / AcOH, pyridine / 12 h / Ambient temperature View Scheme

1: 1) Mg / 2)Li2CuCl4 / 1) THF, 2) THF, -10 deg C, 5 h 2: 50 percent / pTsOH / methanol / 6 h / 55 °C 3: 60 percent / PCC / CH2Cl2 / 2 h View Scheme