1: 4-methoxy-1-(phenylsulfonyl)pyrrolo[2,3-b]pyridine With lithium diisopropyl amide in tetrahydrofuran T=-30°C; Inert atmosphere; 2: methyl iodide in tetrahydrofuran T=-30 - 20°C; Inert atmosphere;

N-benzyl-N,N,N-triethylammonium chloride; sodium hydroxide in dichloromethane T=0°C; Inert atmosphere;