1.1: sodium dihydrogenphosphate; sodium chlorite / 2-methyl-but-2-ene; water; tert-butyl alcohol / 1.5 h / 20 °C 2.1: thionyl chloride / dichloromethane / 6 h / 20 °C 2.2: 12 h / -25 °C 3.1: palladium 10 on activated carbon; hydrogen / ethanol / 13 h / 20 °C 4.1: sodium hydroxide / ethanol; water / 3 h / Reflux 4.2: 1 h / 160 °C / Inert atmosphere 5.1: lithium aluminium tetrahydride / tetrahydrofuran / 5 h / 0 - 20 °C 6.1: triethylamine / dichloromethane / 1 h / 20 °C 7.1: N,N-dimethyl-formamide / 1 h / 100 °C 8.1: hydrazine / ethanol / 3 h / Reflux 9.1: sodium hydroxide / tetrahydrofuran; water / 1 h / 20 °C View Scheme