1: With sodium hydride in N,N-dimethyl-formamide T=20 - 100°C; 10 h; Inert atmosphere; 2: With hydrogenchloride; water in tetrahydrofuran; N,N-dimethyl-formamide 2 h; RefluxInert atmosphere;

lithium aluminium tetrahydride in tetrahydrofuran 10 h; Reflux;