1: LiAlH4 / tetrahydrofuran / 1.5 h / Heating 2: 95 percent / DMAP; pyridine / 4 h / 20 °C 3: 81 percent / methanol; dimethylformamide; hexamethylphosphoric acid triamide / 12 h / 80 °C View Scheme

1.1: LAH 2.1: Ph3P; imidazole; I2 3.1: t-BuLi / -78 °C 3.2: 79 percent / -78 - 20 °C View Scheme

1: With lithium aluminium tetrahydride in tetrahydrofuran T=0°C; 12 h; 2: With water in tetrahydrofuran