1: 3-bromo-2,6-dimethylpyridine With n-butyllithium in diethyl ether; hexane T=-78°C; 0.75 h; 2: 2-isopropoxy-4,4,5,5-tetramethyl-1,3,2-dioxaborolane in diethyl ether; hexane T=-78°C; 3 h;