1: 3-bromo-4-chloro-1H-pyrrolo[2,3-b]pyridine With n-butyllithium in tetrahydrofuran T=-78°C; 0.5 h; 2: N,N-dimethyl-formamide in tetrahydrofuran T=-78 - 25°C; 2 h; 3: With water; ammonium chloride more than 3 stages;

acetic acid in water 14 h; Heating / reflux;