1.1: sodium hydride / N,N-dimethyl-formamide / 1 h / 20 °C / Inert atmosphere 1.2: 20 °C / Inert atmosphere 2.1: α,α'-azodiizobutyramidine-dihydrochloride / methanol / Reflux; Inert atmosphere 3.1: trifluoroacetic acid / dichloromethane / 1 h / 20 °C 4.1: hydrogenchloride; water / methanol / Reflux; Inert atmosphere View Scheme

With  sodium azide; tetra-(n-butyl)ammonium iodide in  N,N-dimethyl-formamide T=70°C; 2 h;