Ethyl 2-(6-amino-1H-indol-1-yl)acetate (intermediate B) (7.66 mmol, 1 equiv.) was dissolved in benzene (30 ml), and methyl 2-(bromo-methyl)-6-methylbenzoate (8.42 mol, 1.1 equiv.) and TEA (9.19 mmol, 1.2 equiv.) were added at 25° C. and the mixture was refluxed for 12 h. The reaction mixture was reduced under reduced pressure and the residue was taken up in dichloromethane (30 ml), washed with water and sat. NaCl solution (5 ml), dried over sodium sulfate and concentrated under reduced pressure. The crude product was purified by column chromatography (10% ethyl acetate in hexane). Yield: 64%
