1: ammonium formate / palladium 10 on activated carbon / ethanol / 30 - 70 °C 2: triethylamine / ethanol / 50 - 60 °C / Inert atmosphere 3: hydrogenchloride; water / methanol / 35 °C 4: isopentyl nitrite / acetonitrile / 30 - 60 °C 5: N-ethyl-N,N-diisopropylamine / acetonitrile / 25 - 35 °C 6: lithium borohydride / tetrahydrofuran / -10 - 20 °C View Scheme