in anhydrous xylene; N,N-dimethyl-formamide 4 h; RefluxInert atmosphere; Solvent;

1: N-benzyl-trimethylammonium hydroxide / methanol; 1,4-dioxane / |Inert atmosphere 2: hydrogen; palladium on activated charcoal / tetrahydrofuran / |Inert atmosphere 3: ethanol / |Inert atmosphere 4: hydrogenchloride / |Inert atmosphere 5: sodium ethanolate / ethanol / |Inert atmosphere 6: N,N-dimethyl-formamide; anhydrous xylene / 4 h / |Reflux; |Inert atmosphere View Scheme

1: hydrogen; palladium on activated charcoal / tetrahydrofuran / |Inert atmosphere 2: ethanol / |Inert atmosphere 3: hydrogenchloride / |Inert atmosphere 4: sodium ethanolate / ethanol / |Inert atmosphere 5: N,N-dimethyl-formamide; anhydrous xylene / 4 h / |Reflux; |Inert atmosphere View Scheme