Synthesis of 2, 4-dibromopyridine and 4, 4'-dibromo-2, 2'-bipyridine. Efficient usage in selective bromine-substitution under palladium-catalysis
R Garcia-Lago, JL Alonso-Gomez, C Sicre…
Index: Garcia-Lago, Ramon; Alonso-Gomez, Jose-Lorenzo; Sicre, Cristina; Cid, Maria-Magdalena Heterocycles, 2008 , vol. 75, # 1 p. 57 - 64
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Citation Number: 14
Abstract
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 ...
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