potassium carbonate in acetonitrile T=60°C; 9 h;

1: (1H-indol-3-yl)-acetonitrile With tetra(n-butyl)ammonium hydrogensulfate; sodium hydroxide in dichloromethane; water T=0°C; 0.25 h; 2: p-toluenesulfonyl chloride in dichloromethane; water T=20°C; 12 h;