1: N,N-dimethyl-formamide With trichlorophosphate T=0 - 20°C; Inert atmosphere; 2: 4,5-dihydro-1H-benzo[g]indole in 1,2-dichloro-ethane T=0°C; 0.833333 h; Reflux; 3: With water; sodium acetate in 1,2-dichloro-ethane 0.5 h; Reflux;