pyridine; methyllithium; bromine; lithium bromide 1.) THF, ether, from 0 deg C to 25 deg C, 1.5 h, 2.) THF, ether, methylene chloride, -78 deg C, 15 h; Multistep reaction;

n-butyllithium; bromine 1.) diethylether, hexane, -40 deg C, 2.) -40 deg C; Multistep reaction;