1: 75 percent / 2 h / 120 °C 2: 94 percent / t-butylhypochlorite / methanol / 0.5 h / 0 °C 3: 53 percent / aluminiumoxide, NaBH4 / diethyl ether / 1 h / Ambient temperature 4: 45 percent / zinc powder / acetic acid / 0.5 h View Scheme

1: 67 percent 2: 52 percent / lithium diisopropylamide / hexamethylphosphoric acid triamide; tetrahydrofuran View Scheme

T=120°C; 2 h;