1: sodium hydride / N,N-dimethyl-formamide; mineral oil / 16 h / 70 °C / |Inert atmosphere 2: Oxonereg; / methanol; tetrahydrofuran / 19 h / 20 °C / |Inert atmosphere 3: N,N,N',N,-tetramethylethylenediamine; iron (III) acetylacetonate; CPME / diethyl ether / 18 h / 20 °C / |Inert atmosphere View Scheme

sodium azide in N,N-dimethyl-formamide T=90°C; 5 h;