1: 94 percent / tetrahydrofuran / 48 h / 50 °C 3: 94 percent / DMAP, DCC / CH2Cl2 / 12 h / -20 - 20 °C 4: 49 percent / BBr3 / CH2Cl2 / 1.5 h / -78 °C 5: 92 percent / Pd(PPh3)4, morpholine / tetrahydrofuran / Ambient temperature View Scheme