1: 3-bromo-1-tert-butyldimethylsilyl-7-azaindole With tert.-butyl lithium in tetrahydrofuran; pentane T=-90°C; 0.0833333 h; 2: trimethylstannyl chloride in tetrahydrofuran; diethyl ether; pentane T=-90°C; 1 h;