1: 2-methoxy-pyridine With tert.-butyl lithium in tetrahydrofuran; pentane T=-75 - -60°C; 1 h; 2: N-ethoxyethyl-N-methylformamide in tetrahydrofuran; pentane T=-75 - -60°C; 0.5 h; 3: With n-butyllithium; water; iodine; sodium sulfite more than 3 stages;