1: With AlCl3, aluminium chloride in nitrobenzene T=0 - 20°C; 18 h; 2: With hydrogenchloride; water in ethyl acetate; nitrobenzene T=0 - 20°C; 2 h;

potassium carbonate in N,N-dimethyl-formamide T=0 - 20°C; 3 h;