1: 73 percent / hydrogen / 10 percent palladium on charcoal / acetic acid / 4 h / Ambient temperature 2: 82 percent / CaCl2, NaBH4 / ethanol / 0.25 h / Ambient temperature 3: 98 percent / pyridine / 0.33 h / 0 °C 4: 90 percent / LiBEt3 / tetrahydrofuran / 1 h / Ambient temperature View Scheme