1: 2-Bromo-5-chloropyridine With sec.-butyllithium in diethyl ether; hexane T=-60°C; 2 h; 2: N,N-dimethyl acetamide in diethyl ether; hexane 3 h; 3: With hydrogenchloride; water in diethyl ether; hexane

1: in tetrahydrofuran; diethyl ether T=-63 - 20°C; 2.25 h; 2: With hydrogenchloride; water in tetrahydrofuran; diethyl ether 4 h; 3: With sodium hydrogencarbonate in tetrahydrofuran; diethyl ether pH=7;

1: in tetrahydrofuran T=0°C; 2 h; 2: With water in tetrahydrofuran

hydrogenchloride; n-butyllithium in tetrahydrofuran; diethyl ether; hexane; N,N-dimethyl acetamide; water

hydrogenchloride in diethyl ether; dichloromethane; water T=20°C;