1: 5-bromo-1-(triisopropylsilyl)-1H-pyrrolo[2,3-b]pyridine With tert.-butyl lithium in tetrahydrofuran T=-78°C; 0.333333 h; 2: acetone in tetrahydrofuran T=-78 - 20°C; 0.5 h; 3: With water in tetrahydrofuran T=20°C;