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

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