1: 69.7 percent / PBr3, pyridine / diethyl ether / 1.) overnight; 2.) 2 h, reflux 2: 2.) Li2CuCl4 / 1.) THF, -10 deg C, 30 min; 2.) THF, -10 deg C, 3 h 3: 79.3 percent / pyridine / acetic acid / 12 h / Ambient temperature View Scheme