1: 65 percent / BF3*OEt2 / CH2Cl2 2: 63 percent / n-BuLi / tetrahydrofuran / 0.02 h / -100 °C 3: 75 percent / 10percent HCl / methanol; H2O / 36 h / Heating 4: 95 percent / H2 / Pd/C 5: 84 percent / DEAD, PPh3 / tetrahydrofuran / Ambient temperature 6: 55 percent / tributyltin hydride, AIBN / toluene / Heating View Scheme

1: 65 percent / BF3*OEt2 / CH2Cl2 2: 63 percent / n-BuLi / tetrahydrofuran / 0.02 h / -100 °C 3: 75 percent / 10percent HCl / methanol; H2O / 36 h / Heating 4: 95 percent / H2 / Pd/C View Scheme