1.1: 78 percent / K2CO3 / acetone / 24 h / Heating 2.1: t-BuLi / diethyl ether; hexane / 0.25 h / -78 °C 2.2: diethyl ether; hexane / -78 - 25 °C 3.1: 0.470 g / PCC / CH2Cl2 / 12 h / 25 °C 4.1: 53 percent / NaOAc / PdCl2(PPh3)2 / N,N-dimethyl-acetamide / 0.02 h / Irradiation View Scheme

bromine in tetrachloromethane 3 h;