1: 70 percent / butyl-lithium / hexane; tetrahydrofuran; hexamethylphosphoric acid triamide / 24 h / Ambient temperature 2: 0.4 g / hydrogen / 5percent palladium-barium sulphate / ethyl acetate View Scheme

1: 70 percent / butyl-lithium / hexane; tetrahydrofuran; hexamethylphosphoric acid triamide / 24 h / Ambient temperature 2: 0.4 g / hydrogen / 5percent palladium-barium sulphate / ethyl acetate 3: 0.57 g / CDCl3 / 96 h / 50 °C 4: 300 mg / trifluoroacetic acid / tetrahydrofuran; H2O / Ambient temperature View Scheme