1: 1-methyl-1H-indole With tert.-butyl lithium in tetrahydrofuran; pentane T=-78 - 20°C; Inert atmosphere; 2: tri-isopropoxy-borane in tetrahydrofuran; pentane T=-78 - 20°C; 1 h; 3: With potassium hydrogensulfate; water; ammonium chloride in tetrahydrofuran; pentane T=20°C; pH=2; 0.5 h;

sec.-butyllithium in tetrahydrofuran