1: methanol; potassium carbonate / 1 h / 0 - 20 °C 2: 1H-imidazole / dichloromethane / 1.5 h / 20 °C 3: lithium borohydride / tetrahydrofuran / 4 h / 0 - 20 °C 4: N-ethyl-N,N-diisopropylamine / dichloromethane / 0.75 h / 0 - 20 °C 5: tetrabutyl ammonium fluoride / tetrahydrofuran / 0.5 h / 20 °C 6: sodium hydride / tetrahydrofuran / 24 h / 0 - 20 °C 7: palladium 10 on activated carbon; hydrogen / methanol / 50 °C View Scheme