1: n-butyllithium / tetrahydrofuran; hexane / 6 h / -78 °C / other temperature 2: hydroxylamine hydrochloride, AcONa*3H2O / ethanol / 19 h / Ambient temperature 3: 20percent aq. TiCl3, NH4OAc / H2O; dioxane / 6 h / 0 °C View Scheme

1: n-butyllithium / tetrahydrofuran; hexamethylphosphoric acid triamide; hexane / 1.) -78 deg C, 2 h, 2.) RT, 0.5 h, 3.) -78 deg C, 0.5 h, 4.) -30 - -20 deg C, 10 h 2: hydroxylamine acetate / ethanol / 20 h / Ambient temperature View Scheme

1: n-butyllithium / tetrahydrofuran; hexane / 6 h / -78 °C / other temperature 2: hydroxylamine hydrochloride, AcONa*3H2O / ethanol / 19 h / Ambient temperature 3: 20percent aq. TiCl3, NH4OAc / H2O; dioxane / 6 h / 0 °C View Scheme

1: n-butyllithium / tetrahydrofuran; hexane / 6 h / -78 °C / other temperature 2: hydroxylamine hydrochloride, AcONa*3H2O / ethanol / 19 h / Ambient temperature 3: 20percent aq. TiCl3, NH4OAc / H2O; dioxane / 6 h / 0 °C View Scheme

1: n-butyllithium / tetrahydrofuran; hexane / 6 h / -78 °C / other temperature 2: hydroxylamine hydrochloride, AcONa*3H2O / ethanol / 19 h / Ambient temperature 3: dioxane / 4 h / Ambient temperature 4: 10percent HCl-MeOH / Ambient temperature View Scheme