1: 5-Bromo-3-methyl-1H-indazole With tert.-butyl lithium in tetrahydrofuran; pentane T=-78 - 70°C; 0.5 h; Inert atmosphere; 2: N,N-dimethyl-formamide in tetrahydrofuran; pentane T=-78 - 20°C; 2 h; Inert atmosphere;