1: 5-fluoro-1H-indole-2-carboxylic acid ethyl ester With sodium hydride in N,N-dimethyl-formamide T=0 - 20°C; 1 h; 2: 4-(bromomethyl)pyridine hydrobromide in N,N-dimethyl-formamide T=0 - 20°C; 21.5 h;

tributylphosphine; 1,1'-azodicarbonyl-dipiperidine in toluene T=20°C; 48 h;