Abstract− We report an efficient method for preparing 2, 4-dibromopyridine and 4, 4'-dibromo- 2, 2'-bipyridine from the corresponding nitroazine N-oxide in one step via a tandem nucleophilic substitution–N-oxide reduction process. The one step preparation of 4, 4'-dihalo- 2, 2'-bipyridines from dihalopyridines via a Stille reaction is also described. 4, 4'-Dibromo-2, 2'-bipyridine undergoes selective mono-or disubstitution processes under palladium ...
