1: 67 percent / PBr3, pyridine / diethyl ether / 1) overnight, 2) 2 h, reflux 2: 1) Mg / 2) Li2CuCl4 / 1) THF; 2) THF, 5 h, -10 deg C 3: 72 percent / AcOH, pyridine View Scheme