1: 91 percent / K2CO3 / CH2Cl2; methanol / 1 h / Ambient temperature 2: 1.) MsCl, pyridine, 2.) NBu4I, BaCO3, pyridine 3: Hg(OAc)2 4: 1.) BSA, 2.) TMSTf / 1.) MeCN, reflux, 2.) room temperature, 7 h 5: 69 percent / BBr3 / CH2Cl2 / 0.25 h / -78 °C View Scheme