1: 1) 9-BBN, 2) NaOH, H2O2 / 1) THF, 25 deg C, 19h, 2a) 0 deg C, 30 min, 2b) 25 deg C, 10h 2: 95 percent / CBr4, PPh3, K2CO3 / CH2Cl2 / 0.5 h / 0 °C 4: 80 percent / 5percent HCl / tetrahydrofuran / 216 h / 25 °C View Scheme