1: N,N-dimethyl-formamide / 5 h / 100 °C / Inert atmosphere 2: palladium 10 on activated carbon; hydrogen / ethyl acetate / 66 h / 20 °C / 7600.51 Torr / Autoclave 3: ethanol; potassium hydroxide / 14 h / 80 °C / Inert atmosphere View Scheme

1.1: N,N-dimethyl-formamide / 5 h / 100 °C / Inert atmosphere 2.1: palladium 10 on activated carbon; hydrogen / ethyl acetate / 66 h / 20 °C / 7600.51 Torr / Autoclave 3.1: ethanol; potassium hydroxide / 14 h / 80 °C / Inert atmosphere 4.1: potassium tert-butylate; tetra-(n-butyl)ammonium iodide / N,N-dimethyl-formamide / 2 h / 20 °C / Inert atmosphere 4.2: 5.5 h / 60 - 120 °C / Inert atmosphere View Scheme