1: tetrabutyl ammonium fluoride / tetrahydrofuran / 2 h / Reflux 2: trichlorophosphate / 1 h / 20 °C 3: hydroxylamine hydrochloride; sodium acetate / 1,4-dioxane / 24 h / Reflux 4: 10 palladium on activated charcoal / 1,2-dichloro-benzene / Reflux View Scheme

tetrabutyl ammonium fluoride in tetrahydrofuran 2 h; Reflux;