1: N,N-dimethyl-formamide With trichlorophosphate in 1,2-dichloro-ethane T=5°C; 2: 1H-Indole-7-carboxylic acid,methyl ester in 1,2-dichloro-ethane T=5 - 50°C; 2.5 h; 3: With water; sodium carbonate in dichloromethane T=20°C; 0.5 h;